Java Development Services & Enterprise Modernization
Devs & Logics provides Java development services for US companies — Spring Boot APIs and microservices, legacy Java modernization to 21 and 25 LTS, and enterprise backends paired with modern Next.js and React frontends — delivered in fixed-scope phases for teams in New York, Chicago, Boston, and nationwide.
The problem we solve
The support clock is running: Oracle's free license for Java 21 and Premier Support for Java 17 both end in September 2026, and free community builds of Java 8 are listed only through November 2026 — after that, staying put means running unpatched. Meanwhile the estate built on Java 8 and an aging app server quietly blocks everything the board wants next: cloud bills stay high, containers stay slow, and every AI initiative stalls against systems that can't expose their data. The codebase isn't the problem. The version is.
What we deliver
We treat Java as what it is in 2026 — the language your enterprise backends already speak — and build accordingly: modern Spring Boot services, incremental modernization, and clean integration with the systems around them, on the same strangler-style discipline as our enterprise IT services practice. Our default product stack stays TypeScript and Next.js; Java is how we meet your backend world where it lives.
- Spring Boot 4 APIs and microservices on Java 21/25 LTS
- Legacy modernization: Java 8/11 to 21/25, javax-to-jakarta migration, WebLogic/JBoss to embedded Spring Boot
- Java backends paired with modern React and Next.js frontends
- Java + AI on the JVM: Spring AI, LangChain4j, and MCP-based LLM integration
- Event-driven patterns done right — Kafka, idempotent handlers, outbox, schema versioning
- Dedicated Java engineers or team augmentation, US-timezone aligned
Our process
- 1
Estate assessment & version target
We inventory what runs where — JDK versions, frameworks, app servers, support deadlines — and set the target deliberately: Java 21 for estate-wide upgrades the ecosystem has fully certified, or Java 25 LTS for new services and continuously upgraded estates, with free support running through 2033. The javax-to-jakarta gate gets mapped here too, because Spring Boot 4 doesn't negotiate on it.
- 2
Architecture & migration plan
Domain modules, API contracts, and clear data ownership per service — designed so modernization ships incrementally instead of as a big-bang rewrite. Where the roadmap includes user-facing product, the plan pairs Java services with the modern frontends our web development team builds, with one clean API contract between the two worlds.
- 3
Incremental build & modernization
New Spring Boot services ship alongside the old system, one function strangled at a time, with parallel runs and reconciliation before anything retires. Mechanical upgrades lean on transformation tooling — Amazon has reported roughly ten minutes per application across a thousand-app internal fleet — so the engineering hours go to the judgment calls, not the find-and-replace.
- 4
QA, deployment & handoff
Contract and integration tests, CI/CD pipelines, containers, and observability land with the code — and where the roadmap calls for LLM features, the JVM path runs through our AI development and integration practice: Spring AI and LangChain4j behind the same eval and cost discipline as the rest of our AI work.
Proof & outcomes
- Production API, integration, and migration engineering across our shipped case studies
- Incremental modernization with parallel-run reconciliation as standard delivery practice
- Modernization economics we plan against: industry reporting puts license elimination at $500K–$2M+ a year for teams leaving commercial app servers for embedded Spring Boot
- Production stacks: PostgreSQL, Kafka-style messaging, Docker, AWS, CI/CD with quality gates
Core Ecosystem & Tools
Related Technologies
Related articles
Frequently asked questions
What is included in your Java development services?
Spring Boot API and microservice development on Java 21/25, incremental legacy modernization — version upgrades, javax-to-jakarta migration, app-server exits — integration with modern web frontends, Java-side AI features via Spring AI and LangChain4j, and dedicated Java engineers when you need capacity rather than a project. Each engagement is scoped per phase with fixed pricing or a monthly team retainer.
Which Java version should we target in 2026?
Java 21 for an estate-wide upgrade: it's the LTS the ecosystem has fully certified, with virtual threads and the modern language features. Java 25 LTS for new services and continuously upgraded estates — released September 2025 with free Oracle support through 2033, the longest runway available. The deadline pressure is real either way: Java 21's free Oracle license and Java 17's Premier Support both end in September 2026, and free community Java 8 builds are listed only through November 2026.
Can you modernize our legacy Java system off WebLogic or Java 8?
Yes — incrementally, never as a big-bang rewrite. We map the estate, move one function at a time to embedded Spring Boot behind clean APIs, run old and new in parallel until reconciliation proves the cutover, and retire the app server at the end rather than the start. Industry reporting puts license elimination alone at $500,000–$2M+ a year for teams leaving commercial app servers — before the operational gains.
Do you pair Java backends with React or Next.js frontends?
Yes — it's our most natural configuration. The backend stays on the JVM where your business logic, data, and integrations already live; the product surface ships on Next.js and React with one clean API contract between them. Teams get modern UX velocity without rewriting the systems of record underneath.
How much does Java development cost?
In the 2026 US market, senior onshore engineering runs $120–$200 an hour, and dedicated teams of 8–10 typically land at $30,000–$50,000 a month. Modernization scope drives the number more than headcount — integration count, app-server exits, and test coverage of the existing estate. We quote each phase as a fixed price after the assessment, so the figure attaches to a scope you've seen.
Areas we serve
8 US markets. Explore local pages:
Discuss your Java project
Tell us your JDK versions, your app servers, and the deadline you're watching. We'll come back with a version target, a phased plan, and a fixed quote for phase one.
Contact us