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Java Application Development Company

For Systems Where Downtime Is Expensive

Spring Boot services, enterprise web platforms, J2EE estates brought up to date, Java APIs and Android clients on Java backends, built and modernised for software expected to last a decade.

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Why Choose OSDY LLC as Your Java Development Company

We Inherit Code, Not Just Write It

Most Java work is not a blank page. It is a system somebody built in 2011 that now needs to do something new. Our engineers are used to reading unfamiliar code, finding out what it actually does, and changing it without breaking the parts nobody documented.

Boring Choices on Purpose

Spring Boot, PostgreSQL or Oracle, Kafka where it earns its place. We favour libraries with long support horizons and large hiring pools, because a Java application usually outlives the team that wrote it and the fashionable framework it was tempting to use.

Performance Measured, Not Guessed

JVM tuning, heap and garbage collection analysis, query profiling, and load testing against real traffic shapes. Java performance problems are almost never where people assume, which is why we profile before changing anything.

Handover Is Part of the Work

Readable code, current dependencies, tests that run, and documentation your own developers can follow. If you would struggle to hand the codebase to a new hire after we leave, we have not finished the job properly.

Services

Our Java Development Services

Custom Java development services covering web platforms, enterprise systems, APIs, mobile backends, and the modernisation of Java estates that have been running for years. Our Java software development services and Java app development services come from the same team, so one Java development company stays accountable for the build and for everything after it. Java development solutions here tend to start with what you already own rather than with an empty repository.

Custom Java Development

  • Custom Java application development built to your domain.
  • No product licence and no framework of ours to inherit.
  • Source, tests, and documentation yours from day one.
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Java Web Development Services

  • Java web application development on Spring Boot.
  • Angular or React front ends, or server-rendered Thymeleaf.
  • Built for the load you have, not a hypothetical one.
Explore Java Web →

Enterprise Java Development

  • Enterprise Java application development for large estates.
  • Transaction integrity, audit trails, and role-based access.
  • Integration with the systems you cannot replace.
Explore Enterprise Java →

Spring & Spring Boot Engineering

  • Spring application development, from monolith to services.
  • Spring Security, Spring Data, and Hibernate done properly.
  • Upgrades from ageing Spring versions without a rewrite.
Explore Spring →

J2EE & Jakarta EE Modernisation

  • Custom J2EE development and migration off dead app servers.
  • Javax to Jakarta namespace moves handled methodically.
  • Incremental, so the system stays live throughout.
Explore Modernisation →

Java APIs & Integration

  • REST and GraphQL APIs, plus gRPC where latency matters.
  • Kafka, RabbitMQ, and Camel for asynchronous work.
  • Legacy SOAP endpoints wrapped rather than rewritten.
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Java Mobile App Development

  • Android clients in Java or Kotlin on a Java backend.
  • One API serving Android, iOS, and web from the same logic.
  • Offline sync, push, and background work handled.
Explore Java Mobile →

Intranet & Extranet Portals

  • Employee intranets and partner or supplier extranets.
  • Single sign-on against Active Directory or Entra ID.
  • Per-partner data separation that survives an audit.
Explore Portals →

Java Cloud Development

  • Containerised Java on AWS, Azure, or Google Cloud.
  • Right-sized JVMs, because default heap settings waste money.
  • Quarkus or GraalVM native builds where cold starts matter.
Explore Java Cloud →

Performance & JVM Tuning

  • Heap, garbage collection, and thread pool analysis.
  • Query profiling and the N+1 problems nobody noticed.
  • Load tests shaped like your real traffic.
Explore Tuning →

Java Consulting & Code Review

  • An honest read on a codebase before you commit budget.
  • Architecture review, upgrade paths, and risk register.
  • Useful when the original team has moved on.
Explore Consulting →

Maintenance & Support

  • Dependency and JDK upgrades kept current, not deferred.
  • CVE patching with a named engineer who knows your code.
  • Support tiers from business hours to always on.
Explore Support →
Java engineers reviewing an enterprise system architecture

Nobody wants a rewrite. They want the system to stop being a problem.

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Two firms quoted us for a full rebuild. OSDY LLC upgraded the JDK, replaced three dead libraries, and fixed the queries. Same system, four times faster, a fraction of the money.
Head of IT, Insurance Group

What to Expect From a Java Development Company

Business Priorities

First recommendation
Framework choice
Performance work
Legacy J2EE
Testing
Documentation
After go-live

Industry Gaps

Rewrite it in something modern
Whatever is current this year
Add servers
Out of scope
Manual before release
Delivered at the end, if at all
A new statement of work

Our Proven Advantage

Measure it, then change the least that works
Long support horizon and a real hiring pool
Profile the JVM and the queries first
Migrated incrementally while it stays live
JUnit and integration suites in the pipeline
Written as we go, for your next hire
Upgrades and CVE patching on a known scope

Global Standards. Built-In Trust.

Java projects tend to sit close to money, records, or regulated processes, so our work runs inside a certified security and quality management system with background-checked engineers and traceable change control. That includes dependency and container scanning in the pipeline, secrets kept out of configuration files, PIPEDA-compliant handling for US clients, and the audit evidence SOC 2, HIPAA, and ISO reviews ask for.

ISO 27001
ISO 9001
ISO 20000
HIPAA Compliant
GDPR
AICPA SOC

Book a Free Java Consultation

Pick a time and tell us what you are running, what it needs to do, and what has already been tried. You will get a straight answer on whether it needs modernising, tuning, extending, or genuinely replacing, from the engineers who would do the work.

A Premier Java Development Company in US

Engineering leaders work with OSDY LLC because we are comfortable with software that already exists. Review boards including Clutch, DesignRush, and GoodFirms list us as a top rated Java web development company, and much of our Java work arrives by referral from clients whose systems we kept alive rather than replaced.

Clutch DesignRush GoodFirms
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Our Java Technology Stack

The JVM and build tooling, the Spring tier, the server and whatever renders the UI, persistence, the messaging edge, and the cloud and test tooling around it. Weighted toward the well supported, because most Java estates we inherit are expected to run for another decade.

Java
OpenJDK
Kotlin
Scala
Maven
Gradle
Spring
Spring Boot
Spring Security
Hibernate
Quarkus
Thymeleaf
Apache Tomcat
Angular
React
TypeScript
Vaadin
Bootstrap
Oracle
PostgreSQL
MySQL
MongoDB
Redis
Elasticsearch
Apache Kafka
RabbitMQ
Apache Camel
gRPC
GraphQL
REST APIs
AWS
Microsoft Azure
Docker
Kubernetes
Jenkins
JUnit 5

How We Deliver Java Application Development

Every engagement runs through five phases, Discover, Architect, Build, Harden, and Run, with a go or no-go decision at the end of each one.

Discover

For a new build this is domain modelling and constraints. For existing software it is archaeology. We read the code, run it, check what the dependencies still support, and find out which parts the business actually depends on. That last question matters most, because in most Java estates a fifth of the code carries nearly all of the value and a different fifth is dead but nobody dares delete it.

Architect

A target design, a migration sequence if something already exists, and technology choices justified against your team rather than our preferences. This is where we argue against microservices for most clients. Splitting a working monolith is expensive and frequently trades a slow deployment for a distributed system nobody on the team has debugged before.

Build

Two-week increments, each ending with something deployable. Tests are written alongside the code rather than promised for later, because in a system with a decade ahead of it the test suite is what makes future change affordable. Code review is mandatory and your developers are welcome in it from the first sprint.

Harden

Load testing shaped like your real traffic, JVM and query profiling, dependency and container scanning, and a penetration test where the application warrants one. Java applications tend to fail under load in ways that only appear under load, so this phase is scheduled work rather than a contingency.

Run

Monitoring, alerting, and a documented upgrade path for the JDK and the dependency tree. We either hand this to your team with training or maintain it on a support tier. What we will not do is leave you on a JDK that stops receiving security updates in eighteen months without telling you about it.

One Technology, Many Uses

Java has been declared obsolete roughly once every three years since 1998 and now runs a larger share of banking, insurance, logistics, and government systems than it ever has. The reason is unglamorous: the JVM is fast, the library ecosystem is deep, the language changes carefully, and you can still hire people who know it. OSDY LLC works in Java because those properties matter more than novelty when software has to last.

Most of what we are asked to do falls into three shapes. Build something new where reliability and integration matter more than speed to market. Extend a system that works but was not designed for what the business now needs. Or rescue an estate where the original team has gone, the dependencies are eight years old, and nobody is certain what would break.

The third is the most common and the most misdiagnosed. It usually arrives described as a rewrite, and a rewrite is usually the wrong answer. Replacing working software means rebuilding a decade of accumulated business rules that exist nowhere except in that code, which is why rewrites overrun so reliably.

A working system contains every edge case the business hit over ten years, most of them undocumented. A rewrite starts from the requirements somebody can remember, which is a fraction of them, and the gap surfaces as production bugs eighteen months in. Upgrading the JDK, replacing dead libraries, and refactoring the worst modules is slower to talk about and much faster to finish.
Splitting a Java monolith is fashionable and frequently a mistake. You trade a slow deployment for network calls, distributed transactions, and debugging across service boundaries, and you need the platform maturity to run it. A well-structured monolith with a decent build pipeline serves most organisations better. We recommend the split when team size or scaling genuinely demands it.
Running an unsupported JDK is the most common serious risk we find, and the least discussed. Java 8 and 11 estates are still everywhere. Moving to a supported long-term release is usually less work than teams fear, and it buys real performance for free along with security updates. We treat it as maintenance rather than as a project needing its own business case.
Teams add servers when the problem is an N+1 query, a badly sized connection pool, or garbage collection pauses from a heap configured by nobody in particular. We profile the JVM and the database before touching architecture. The cheapest performance work is almost always the boring kind, and it frequently removes the need for the expensive kind.
Kotlin is a genuine improvement on the JVM and interoperates cleanly, so mixing it into a Java codebase is low risk. It is also another language for your team to maintain. We use it where it earns its place, particularly on Android, and leave a healthy Java codebase alone rather than converting it for its own sake.
Java is the original Android language and still runs a great deal of production Android code alongside Kotlin. It does not run on iOS. So Java mobile app development in practice means a Java backend serving your mobile clients, with Android built in Java or Kotlin and iOS in Swift against the same API. Any firm promising one Java codebase for both platforms is describing something else.
For a small marketing site, a quick prototype, or a data science workflow, Java is heavier than you need. Node, Python, or PHP will get you there faster. Java earns its place when transactions must not be lost, integrations are numerous, load is real, and the system has years ahead of it. We will say so on the first call if your problem is the other shape.

Proven by Results

Java systems kept fast, current, and worth maintaining.

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0

years the average Java estate we inherit has been in production

0%

average response time reduction from profiling before rearchitecting

0%

of clients who arrived asking for a rewrite did not need one

0%

of clients continued with us after the initial engagement

Java Platforms We Have Built and Rescued

Skills Compétences US digital platform

Empowering Future Talent in Trades and Technology

Commissioned by Skills US, we built a national bilingual platform with native apps, a secure CMS, and cloud infrastructure to promote trades and technology careers at scale.
Wildlife Health Cooperative surveillance platform

Digitizing Wildlife Surveillance for National Resilience

For the Wildlife Health Cooperative, we replaced siloed tools with a cloud-native platform that unifies field reports, lab diagnostics, and cross-province analytics in real time.
Seattle Aquarium interactive digital experience

Interactive Learning Through Digital Experience

We unified kiosks, ticketing, and mobile into one cloud-native platform for Seattle Aquarium, raising visitor engagement and streamlining operations across every touchpoint.

Industries We Build Java Applications For

Java concentrates where transactions matter, integrations are numerous, and systems are expected to outlast the people who commissioned them.

Banking & Financial Services

Banking & Financial Services

  • Transaction integrity and reconciliation.
  • Core banking and payment integrations.
  • Audit trails that satisfy regulators.
Npo Industry

Insurance

Insurance

  • Policy administration and claims engines.
  • Rating and underwriting rules.
  • Broker and adjuster extranets.

Government & Public Sector

Government & Public Sector

  • Data residency inside US.
  • Accessibility and bilingual requirements.
  • Long support horizons expected.

Healthcare & Life Sciences

Healthcare & Life Sciences

  • HL7 and FHIR integration.
  • PHI handling and access control.
  • Clinical systems that cannot go down.

Logistics & Supply Chain

Logistics & Supply Chain

  • Warehouse and scanner integrations.
  • Route, load, and fleet systems.
  • EDI and carrier connections.

Manufacturing & Industrial

Manufacturing & Industrial

  • MES and ERP integration.
  • Shop floor data collection.
  • Supplier extranets and portals.

Retail & eCommerce

Retail & eCommerce

  • Order, inventory, and pricing engines.
  • Peak season load handling.
  • POS and loyalty integration.

Telecom & Connectivity

Telecom & Connectivity

  • Provisioning and billing systems.
  • High-throughput event processing.
  • Self-service customer portals.

Energy & Utilities

Energy & Utilities

  • Metering and consumption data.
  • Outage and asset management.
  • Regulatory reporting pipelines.

Education & eLearning

Education & eLearning

  • Student information systems.
  • Term-start capacity spikes.
  • Multi-campus intranets.

Enterprise SaaS

Enterprise SaaS

  • Multi-tenant Java architecture.
  • Per-tenant data isolation.
  • API-first product platforms.
Legal Services Industry

Legal & Professional Services

Legal & Professional Services

  • Matter and document management.
  • Time and billing integration.
  • Client-facing secure portals.

A Java Software Development Company Comfortable With Software That Already Exists

Plenty of firms will build you a new Java application. Far fewer will take on a codebase written by people who have left, running on a JDK that lost support years ago, with a build nobody can reproduce. That work is less photogenic and it is where most Java budgets actually go, so it is what we organised ourselves around.

Clients find us as a Java app development company, a Java application development company, a Java web app development company, or simply a Java development agency, and the label rarely predicts the work. What they have in common is a system that matters, a business that cannot pause while it is fixed, and a preference for hearing what something will really cost. Whether you need a Java development service provider for one project, custom Java web development to extend a platform, or a Java development team alongside your own, the starting point is the same conversation.

Start with a free consultation, or read more about our custom software development, web application development, Android app development, iOS app development, API development in Java, UI and UX design, app developer hiring, or hiring Java developers.

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Java development team reviewing an enterprise codebase

Articles

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Modernizing Legacy Systems Without a Full Rebuild
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Application Modernization Strategy: Patch It or Replace It?
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83% of Digital Transformations Underdeliver. Here Is the Autopsy

Java Development FAQs

Developers mainly focus to develop applications that are easily scalable. Java EE (Enterprise Edition) offers an inbuilt mechanism that is beneficial for both scaling up and down. Our team creates high performing and scalable applications as per clients’ requirements. In practice scalability comes from a few specific decisions: keeping state out of the application tier, sizing connection pools and thread pools deliberately, caching what is expensive to compute, and moving slow work onto a queue. Java gives you the tools for all four, though the JVM will not save an architecture that holds session state in memory.
Yes, our developers can easily integrate any custom application with your existing CRM systems. This will also help in enhancing and optimizing your business system’s performance. Most CRMs expose a REST API, and for Salesforce, Dynamics, or HubSpot we build a dedicated integration layer rather than scattering API calls through the application. That layer handles authentication, rate limits, retries, and field mapping in one place, which matters because CRM schemas change and you want one file to update rather than forty.
Yes, as a leading provider of Java web development services, we have a wide talent pool. Our experts will assess the working hour requirements for any changes required and will provide an estimate accordingly. Small changes are welcome and are often how a longer relationship begins. We can work on a small block of hours for maintenance and enhancements without requiring a full project engagement, which suits teams who need occasional Java expertise rather than a permanent addition.
Custom Java development, Java web application development, enterprise Java application development, Spring and Spring Boot engineering, J2EE and Jakarta EE modernisation, Java APIs and integration, intranet and extranet portals, Java cloud development, JVM performance tuning, and ongoing maintenance. Our Java application development services cover both new builds and existing systems, and the second is the larger share of our work. Java web application development services and custom Java application development company work often overlap on the same project, since extending a platform usually means building something new inside something old.
Most projects fall between sixty thousand and four hundred thousand US dollars depending on scope, integrations, and how much existing code is involved. Custom Java development services are quoted after a short discovery, because the honest answer depends almost entirely on what you are integrating with. Rates for senior Java engineers in US generally sit between a hundred and twenty and one hundred and ninety dollars an hour.
A focused Spring Boot service or internal application typically takes three to five months. An enterprise platform with multiple integrations runs six to twelve. Modernising an existing estate depends on its condition, though a first meaningful release usually lands within eight to ten weeks because we deliver incrementally rather than in one cutover.
Both descriptions fit, and the distinction people usually mean is mobile. As a Java development company we build server-side applications, web platforms, and enterprise systems. As a Java app development company we also build the mobile clients that sit on top, with Android in Java or Kotlin. Some clients search for a Java app development firm or a Java application development company and mean the same thing, so it is worth being specific about whether you need a mobile client, a web application, or both.
Not a meaningful one. A Java development agency, a Java app development agency, a Java software development company, and a Java development software company are usually the same kind of business described differently. What actually varies is whether the engineers have shipped enterprise Java before, whether they will work on code they did not write, and whether they will tell you when a rewrite is unnecessary. Those three questions separate Java app development companies faster than any comparison of service lists. The same applies to a Java programming company, a Java developer company, or a Java company described with no qualifier at all. Ask about the engineers, not the vocabulary.
Enterprise here describes the constraints rather than the size of your organisation. A thirty-person insurance broker with policy data, an audit obligation, and four integrations has an enterprise Java problem. As an enterprise Java development company we take on that shape of work, and enterprise Java development services usually means transactions that cannot be lost, permissions that must be provable, and a system expected to run for years. A Java enterprise application development company is describing the same thing.
Effectively yes, since almost every modern Java project involves both. A Spring development company and a Spring application development company are usually just Java shops naming their main framework, and the same is true of a Hibernate app development company. Our engineers work across Spring Boot, Spring Security, Spring Data, and Hibernate daily, and most performance problems we are asked to fix turn out to live in the Hibernate mapping rather than in Spring.
Yes to the developer, with a clarification on the designer. A mobile Java developer in practice means an Android engineer working in Java or Kotlin, and we can place one inside your team. If you want to hire Java app designers, what you usually need is a product designer who understands Android platform conventions rather than someone who writes Java, and we can supply both roles separately. Our UI and UX design team handles the interface side.
Yes, and it is a large part of our work. Java web development services here mean Spring Boot on the server with either a JavaScript front end in Angular or React, or server-rendered pages with Thymeleaf where a single-page application would be overkill. As a Java web application development company we take on both new platforms and the extension of existing ones, and Java web app development services are frequently how a client first engages us.
Enterprise Java development means applications where transaction integrity, access control, auditability, and integration matter more than time to market. Think policy administration, order management, or claims processing rather than a marketing site. Java enterprise custom app development typically involves several existing systems that cannot be changed, which is precisely the constraint the language and its ecosystem are good at.
Yes, and it is one of the reasons clients come to us. J2EE became Java EE and then Jakarta EE, so a system described as J2EE is usually fifteen or more years old and running on an application server that has lost support. As a J2EE development company we handle those migrations incrementally, including the javax to jakarta namespace change, so the system stays live. Custom J2EE development on an existing estate is entirely feasible and often cheaper than the replacement being proposed, which is why a J2EE application development company is still a useful thing to be able to hire in 2026.
Yes. WebLogic, WebSphere, JBoss, and old Tomcat versions are all common starting points, and the destination is usually a supported Tomcat or an embedded server in Spring Boot. We move one module at a time behind a routing layer so both versions run in parallel during the transition. It takes longer than a single cutover and it does not require a weekend where the business holds its breath.
Modernise, in about four cases out of five. A working system encodes years of business rules that exist nowhere else, and a rewrite starts from the subset somebody remembers. Upgrading the JDK, replacing unmaintained libraries, adding tests, and refactoring the worst modules delivers most of the benefit at a fraction of the risk. We will tell you when a rewrite genuinely is the answer, which is usually when the architecture cannot support a requirement at all.
Spring and Spring Boot for most work, with Spring Security and Spring Data alongside. Hibernate for persistence, Quarkus where fast startup or a small memory footprint matters, and Thymeleaf or Vaadin for server-rendered interfaces. On existing systems we work with whatever is already there, including Struts and older Spring versions, because replacing a framework and adding a feature at the same time is how projects lose control.
Yes. A great deal of what a Spring application development company actually does is Spring Boot service work, and Hibernate mapping problems are among the most common causes of slow Java applications we are called in to fix. Lazy loading misuse and N+1 queries are usually the culprits, and fixing them is fast once someone has actually profiled the queries.
With one clarification worth making. Java is the original Android language, so Java mobile app development means Android clients in Java or Kotlin, plus the Java backend serving them. Java does not run on iOS, so an iOS client is built in Swift against the same API. A Java mobile app development company that promises one Java codebase for both platforms is describing something other than native development, and you should ask what. Any Java mobile app development firm worth hiring will make that distinction before you sign rather than after.
Not directly, and it is worth being clear because the question comes up often. Using Java for iOS apps is not a native path, because Apple platforms run Swift and Objective-C, so Java development for iOS means something different from what people expect. What Java does for an iOS product is the server side: the API, the business logic, the database, and the integrations. Our Java mobile app development team builds that backend and the Android client, and works with Swift developers for iOS against the same API contract.
Java to app conversion is the way people describe it, and the sensible route is not converting the application but exposing it. We put a REST or GraphQL API in front of your existing Java business logic and build mobile clients against it, so one set of rules serves web, Android, and iOS. Attempting to move a desktop or web Java application onto a phone wholesale tends to produce something that works properly on neither.
Yes, and the recent Java developments are a good part of why. Records, pattern matching, virtual threads, and sealed classes have removed much of the ceremony the language was mocked for, and virtual threads in particular change how you write concurrent server code. Java experts remain among the easier senior engineers to recruit in US, which matters more for a ten-year system than any language feature.
Both, and we will follow whatever your existing codebase uses. Kotlin is now Google’s preferred Android language and is a real improvement, but a large Java Android codebase does not need converting to be maintainable. Mixing the two in one project is normal and low risk, so new work can be Kotlin while existing Java stays put. For a Java and Android development company the practical answer is usually both languages in the same repository.
Yes, and it is steady work. Intranet application development typically means consolidating a directory, documents, approvals, and several spreadsheets into one system with single sign-on against Active Directory or Entra ID. Java suits it because these systems are long lived and need to integrate with HR, finance, and whatever else you already run.
Yes. Extranet app development in US is a recurring engagement for us, usually a portal where dealers, brokers, suppliers, or franchisees see only their own data. We do a lot of intranet and extranet development in US and handle extranet development in Ottawa for public sector and association clients. The hard part is never the interface, it is proving the data separation holds when an auditor tests it.
Yes. As a Java cloud development company we containerise Java applications for AWS, Azure, or Google Cloud, which is mostly a matter of getting configuration, secrets, and JVM sizing right. Default heap settings inside a container waste a surprising amount of money. Where cold start time matters we look at Quarkus or a GraalVM native image rather than assuming a standard JVM.
Yes. REST for most cases, GraphQL where clients need flexible queries, and gRPC where service-to-service latency matters. We also wrap legacy SOAP endpoints so new clients get a modern interface without the old system being touched. Our API development in Java page goes into more detail if that is your primary need.
Not as a specialism, and we would rather say so. Java is used for some desktop and Android games and Minecraft is the famous example, but most commercial game work happens in Unity or Unreal. If you are looking for a Java game development company for a simple Android or desktop game we can help, and for anything ambitious you want a studio built around a game engine.
A supported long-term release, which currently means Java 21 or Java 17. If you are on Java 8 or 11 you are on a version whose free support has ended or is ending, which is the most common serious risk we find in Java estates. The upgrade is usually less painful than teams expect and brings real performance improvements along with security updates.
Yes, on tiers from business hours to always on. Support covers dependency and JDK upgrades, CVE patching, performance monitoring, and small enhancements, with a named engineer who knows your codebase. This is deliberately unglamorous work and it is what keeps a Java application worth owning five years after launch.
Yes, and we recommend it when the original team has moved on. A two to three week review gives you a written assessment of code quality, dependency risk, security exposure, upgrade paths, and a costed roadmap. It is a fixed fee and it is yours to act on with us or with another firm.
Yes. Dedicated Java developers work inside your team and follow your process, and you interview every candidate first. If your need is primarily staffing rather than delivery, our hire Java developers page covers rates, vetting, and how the engagement works. Plenty of clients hire Java app developers for a build and keep one or two on afterwards for maintenance.
Yes. Clients regularly hire Java web developers for a few weeks to add a feature, fix a performance problem, or cover a gap while they recruit. If you would rather hire Java app developers as an ongoing extension of your team, that works on a monthly commitment with the same interview process.
Our Java developers average eight years and the leads considerably more, which matters because most of our work involves reading code before writing any. Experience in enterprise Java is different from general programming experience: knowing how a connection pool behaves under load, or why a transaction boundary is in the wrong place, comes from having been on call for systems like yours.
You do, completely, from the first commit. Work happens in your repositories where possible, there is no proprietary framework of ours embedded in the result, and the licence position of every third-party dependency is documented. Ask any Java development company you shortlist the same question, because arrangements that keep you dependent are easier to enter than to leave.
This is a normal starting condition rather than an obstacle. We reconstruct the picture by reading the code, running it, examining the database, and interviewing whoever remains. The output is a written map of the system, which most clients tell us becomes their onboarding document. It is also the only responsible basis for estimating anything else.
Book a free consultation and tell us what you are running, what it needs to do, and what has already been tried. If existing software is involved, read-only access to the repository is worth more than any specification. We will come back with a straight view on whether it needs tuning, extending, modernising, or genuinely replacing.

Tell Us What You Are Running.

Work with a Java development company that reads the code before recommending the rewrite. Book a free consultation for a straight assessment of what you have and what it needs.

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Java application developers planning an enterprise build