Hire Java Developers

Hire Java developers for the systems that Java still runs: order and policy processing, integration layers between core systems, high-volume APIs and the long-lived applications that cannot afford surprises. PS3G’s Java engineers build in Spring Boot, maintain older Java EE and Spring applications, and understand the integration patterns that keep large organizations running. They join your team as named individuals or a dedicated team, for organizations of every size: a company whose single Java application needs a second engineer, a growing platform splitting into services, or a department inside a large organization with an aging Java estate and a small team.

Hire Java developers who are managed, not just placed

The Java engineers you hire through PS3G come from our enterprise software development practice, where Spring, Hibernate, Solr and Lucene have been part of the toolset for years. They are PS3G employees, screened by our senior backend engineers and supported by a technical lead and an account manager throughout. That is the point of hiring from an engineering firm instead of a staffing agency: when a Hibernate session problem or a message-broker outage appears, the engineer has senior colleagues who have seen it before.

Our engineers are used to Angular or React front ends calling Spring Boot APIs, Java services exchanging messages with .NET or Python services, and integrations with ERPs and partner interfaces that predate everyone on the team.

What they can do for you

Java developers for hire through PS3G are matched to the kind of work below.

• Spring Boot services and APIs. REST services with Spring Security, Spring Data and validation, documented with OpenAPI, built to be deployed as containers.
• Enterprise integration. Message-driven integration with Kafka, RabbitMQ or JMS, batch jobs with Spring Batch, file and API exchanges with partners, and the error handling that makes integrations supportable.
• Microservices and modularization. Splitting a monolith where it helps, with service boundaries, shared contracts, distributed tracing and a plan for data ownership. Our guide on monolith to microservices covers the decision.
• Legacy Java upgrades. Moving applications from older Java versions, Java EE application servers or early Spring to current Java and Spring Boot, including dependency and build-tool cleanup.
• Performance and reliability. JVM tuning, connection-pool and query fixes, caching, and the load testing that proves it.
• Search and data-heavy features. Solr and Elasticsearch integration, reporting services and large-batch processing.

Seniority levels

A mid-level Java developer implements endpoints, repositories, batch steps and integrations to a defined design, writes unit and integration tests, and follows the project’s conventions. A senior developer designs the service and data model, chooses the messaging and persistence approach, sets up the build, security and observability, and reviews the team’s work. A lead engineer owns a system of services, the upgrade or decomposition plan and the relationship with your architecture, operations and front-end teams.

How hiring works

1. Brief. A first conversation on the Java and Spring versions, the application servers or containers, the databases and message brokers, the build tooling, the integrations that matter, and the reporting line and hours you need.
2. Vetted profiles in days. A short list of Java engineers with the systems they have built, the versions they have upgraded, the integration patterns they know, and their availability.
3. Interviews. Your team interviews each candidate. A session on a real service, such as adding a secured endpoint with a repository and tests, shows more than a data-structures quiz.
4. Start. Access to repositories, environments, brokers and databases, a walkthrough of the service map, and first tickets that cross a service boundary early so the engineer learns how the pieces talk.
5. Scale monthly. Add engineers for an upgrade program, reduce after release, or convert individuals into a dedicated team with a PS3G lead, with notice.

Describe your Java estate and we will send profiles that fit it.

Vetting: a technical screen by our own engineers

Senior PS3G engineers screen every Java developer on working code before they are offered to a client. The candidate reads a Spring Boot service with planted faults (a transaction boundary in the wrong place, a lazy-loading exception waiting to happen, an unbounded thread pool, an endpoint missing authorization, a consumer that acknowledges messages before processing them) and explains each and its fix. They are asked how they would design an idempotent consumer, how they would version an API used by other teams, how they would upgrade a large application one module at a time, and how they would find a slow query and a memory problem in production.

The pitfalls when hiring Java developers are specific to the ecosystem’s age. Many candidates have long Java resumes built on one application server and one framework version, and have never used current Java, Spring Boot or containers. Others know Spring’s annotations without understanding what they do, which shows up in transactions and security. Concurrency is widely claimed and rarely understood. And some strong Java developers have never worked with a message broker, which rules them out for integration roles. Our screen sorts these cases before you see a profile.

Individual developers vs a dedicated team vs a fixed-scope project

You can hire backend developers individually into your team, engage a dedicated Java team led by PS3G, or hand us a defined system to deliver as a project through our java development company practice.

Option	Who manages	Fits when	Example
Individual Java developers	Your technical lead	You have the systems, a process and someone to direct the work, and need more hands or specific experience such as Kafka or Spring Batch	A senior Java engineer joining a platform team to build a partner integration service
Dedicated Java team	A PS3G lead, against your priorities	You own the roadmap but want a stream of work run for you, such as an upgrade program alongside feature work	Three developers, a QA engineer and a lead moving a Java EE application to Spring Boot module by module
Fixed-scope project	PS3G owns delivery	The services and integrations are defined and you want a price for the whole thing	An integration layer between an ERP, an e-commerce platform and a warehouse system, delivered with tests and runbooks

The individual and team models are monthly engagements under our staff augmentation terms, adjustable with notice; the project model is quoted as a whole. For Java estates, two further options matter: managed services, where we operate the services under a defined SLA, and advisory, where a senior engineer assesses the estate and writes a decomposition or upgrade plan before anyone is hired. Each starts with a first conversation, a short assessment and a written proposal. The proposal shows monthly cost per role; we do not publish hourly rates.

Related services

• Hire developers and dedicated teams: every technology we staff.
• Enterprise software development: the practice our Java engineers come from.
• Java development services: fixed-scope Spring Boot builds and upgrades.
• Application modernization: when the work is an aging estate rather than one service.
• IT staff augmentation: monthly terms, replacements and IP ownership.
• IT staffing: QA, DevOps and other roles alongside your developers.

Frequently asked questions

Can I hire Spring Boot developers specifically?

Yes. Nearly all of our Java work is in Spring Boot, and the profiles will show the Spring modules each engineer has used in production: Security, Data, Batch, Cloud, Kafka and so on. If your application is on an older Spring version or a Java EE server, we will send engineers who have made that move before.

Do your Java developers also work on the front end?

Some do, in Angular or React, and the profile will say so. For most enterprise applications we recommend pairing a Java engineer with a front-end developer from our Angular or React bench, so the API and the screens are each built by someone who does that full time.

Can you help us upgrade an old Java application without a rewrite?

That is the usual approach. A senior engineer assesses the application, upgrades the build and the Java version first, replaces the riskiest dependencies, adds tests around the modules that will change, and then moves to Spring Boot and containers one module at a time while the application keeps serving users. The proposal shows the sequence.

Which message brokers and databases do your Java engineers know?

Kafka, RabbitMQ and ActiveMQ for messaging; PostgreSQL, Oracle, SQL Server and MySQL for relational data, with JPA and Hibernate or jOOQ; Redis for caching; Solr and Elasticsearch for search. We match on the ones you run and test the fundamentals of transactions and consumer design regardless of brand.

Where are your Java developers located?

Java engineers are based in the US and at our India delivery center, with account management at our headquarters in Wilmington, Delaware. India-based engineers keep hours that overlap the US working day, and for integration roles we align their schedule with the teams whose systems they connect to. You set the mix in the brief.