How do your developers handle JVM performance and memory tuning?

They profile with tools like JFR and VisualVM, select and tune garbage collectors such as G1 or ZGC, size heaps appropriately, and adjust thread pools to balance latency and throughput for the workload.

Which Java version and build tools do your developers work with?

They work with modern LTS releases like Java 17 and 21, using features such as records and virtual threads, and build with Maven or Gradle for dependency management and reproducible builds.

How do your Java developers approach testing and code quality?

They write unit and integration tests with JUnit 5 and Mockito, use Spring's testing support and Testcontainers for realistic dependencies, and enforce quality with static analysis tools like SonarQube and SpotBugs.

How long does it take to build a Java backend?

It depends on the number of services and integrations, the data you migrate, the Java and framework versions you start from and your test coverage. We scope a first release on the scoping call and plan the work around it.

Can your Java developers integrate with our existing systems?

Yes. They work with your databases, message brokers such as Kafka or RabbitMQ, identity provider and third-party APIs, and with older Java EE or SOAP services when a system still depends on them. We map those interfaces before the build starts.

Can we start with a fixed-scope MVP?

Yes. We scope a first release around one workflow, for example one service with its API, data model and tests running in your pipeline. Later releases add services once real usage shows what to build next.

How much does it cost to hire Java developers?

Cost depends on how many Java developers you need, their seniority, the engagement model and how long the work runs. Agnotic does not publish rates; after the scoping call we propose a team and a plan you can compare.

How do you use AI in delivery without risking quality?

AI tools help our engineers draft code and tests, but a person reviews every change, and it passes the same automated tests and security checks as any other code. Which tools may see your code or data is agreed with you at the start.

Backend Specialists

Hire Expert Java Developers On Demand

Java backends grow hard to change when upgrades stall and services pile up. Agnotic Technologies adds Java developers to your team who build and modernize Spring Boot services on current LTS releases, with tests and monitoring in place.

JavaSpring BootHibernate/JPAMaven/GradleJUnitKafka

15-Minute Scoping Call

What do Java developers from Agnotic work on?

Java developers at Agnotic Technologies build and maintain server-side systems on the JVM: Spring Boot APIs, event-driven services on Kafka, batch jobs and integrations with your databases. They join your team or work as a dedicated team, upgrade older code to current Java LTS releases and keep every change covered by tests.

Trusted by global innovators

What They Bring

Capabilities of Our Java Developers

Our Java engineers build enterprise-grade backends, microservices, and high-throughput systems using Spring and the broader JVM ecosystem.

Spring Boot Services

Engineers build production backends with Spring Boot, using dependency injection, Spring Data, and Spring Security to deliver REST APIs and configurable, testable applications.

Microservice Architecture

Developers design distributed systems with service discovery, API gateways, and resilience patterns, integrating Kafka or RabbitMQ for event-driven, loosely coupled communication.

JVM Performance Tuning

They profile and tune JVM applications, configuring garbage collectors, heap sizing, and thread pools to reduce latency and optimize throughput under production load.

Data Persistence

Engineers implement persistence with Hibernate and JPA, managing transactions, connection pooling, and query optimization across relational databases for reliable, efficient data access.

Vetting checklist

Which checks should a Java developer pass?

Ask for evidence from production systems, not a list of frameworks. These are the checks we run before an engineer joins your software development in Java.

A Spring Boot service they built or maintained in production, and how it is configured per environment.
An upgrade they carried out between Java LTS releases, and what broke along the way.
Unit and integration tests with JUnit 5, and Testcontainers for real databases and brokers.
Concurrency they can explain: thread pools, virtual threads and where blocking calls hide.
JPA and SQL they tuned: N+1 queries found, indexes added, transactions kept short.
Dependency scanning in the build and a plan for patching vulnerable libraries.
Secrets kept out of code and config files, loaded from a vault or the platform at runtime.

How We Work

Flexible Java Hiring Options

Flexible hiring structures designed to fit your timeline, budget, and team dynamics.

Senior Java developers

Engineers who own services in your codebase, make design calls on APIs, data and messaging, and review the team's Java code.

Production Java work you can review
Code review and mentoring
Design decisions for services and data

IT staff augmentation services

Dedicated Java teams

Java developers, QA and a tech lead who build or modernize a backend from scope to release.

Team size set by the scope
Sprint-based delivery with weekly demos
Scales up or down as the roadmap changes

Dedicated development teams

Simple Process

How to Hire Java Developers

Four steps from the first call to Java engineers committing to your repositories.

Share your requirements

Tell us the services, the Java and Spring versions, the data stores and the deadlines on a 15-minute scoping call.

Review proposed engineers

We propose Java engineers whose production work matches your stack.

Interview and select

You run technical interviews with the engineers we propose. We arrange them.

Onboard and build

Engineers join your repositories, CI and sprints and start on the first release.

Facts and sources

Which Java standards and releases matter?

Short facts behind the skills we check, each linked to its primary source.

Oracle publishes the Java Language Specification and the Java Virtual Machine Specification for every Java SE release; Java SE 27 was released in September 2026 as JSR 402.
Source: Oracle, Java SE Specifications
Oracle provides Long-Term Support on specific Java SE releases: Java SE 8, 11, 17, 21 and 25 are LTS releases.
Source: Oracle Java SE Support Roadmap
JEP 444 delivered virtual threads in JDK 21: lightweight threads that reduce the effort of writing, maintaining and observing high-throughput concurrent applications.
Source: OpenJDK, JEP 444
Spring Boot 4.1.1 requires at least Java 17 and is compatible with versions up to and including Java 26.
Source: Spring Boot docs, system requirements

What do clients say about working with Agnotic?

We don't just build products; we forge lasting partnerships. See how we've helped industry leaders transform their vision into technical reality.

“I can clearly see how Agnotic has a unique way of handling end-to-end development. They are always active on quick chat and provide support quickly.”

Aaron Phelan

Founder, Benchmark

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Spring Boot offers autoconfiguration, embedded servers, and starter dependencies that reduce boilerplate and setup. Combined with Spring's dependency injection, data, and security modules, it accelerates building production-ready, testable enterprise applications.