Open Lance

Software Development & QA

Hire Java Developers

Java developers build and maintain back-end systems, from Spring Boot services and APIs to long-running enterprise applications.

Post a job How hiring works

The role

What Java developers do

A Java developer builds services with Spring Boot, works with relational databases and message queues, writes tests, and often maintains large codebases that have been running for years. Upgrading from older Java and Spring versions is a frequent project.

Typical deliverables

  • Spring Boot services and REST APIs
  • Upgrades to current Java and Spring versions
  • Integrations with Kafka or other message queues
  • Performance and memory fixes
  • Unit and integration tests

Tools you will see

  • Java 21
  • Spring Boot
  • Hibernate/JPA
  • Maven or Gradle
  • JUnit
  • Kafka

Choosing

How to choose Java developers

What to look for

  • Current Java and Spring Boot experience, not only very old versions.
  • Tests that run as part of the build.
  • Experience diagnosing memory and performance problems.
  • Comfort working in large, established codebases.

Questions to ask

  1. 1How would you upgrade our app from an older Java version?
  2. 2How do you track down a memory leak in a Java service?
  3. 3How do you structure a Spring Boot service?
  4. 4How do you test code that talks to a database?

Planning

Before you post the job

Legacy systems

Older enterprise code often needs an assessment before changes. Pay for a review milestone first.

What drives cost

Codebase size and age, integrations, performance targets and test coverage.

Hiring on Open Lance

  • Posting a job and reviewing proposals are free.
  • Each milestone is funded into escrow before work starts and paid when you approve it.
  • Hire fixed-price, hourly, as a monthly Dedicated Hire, or buy a packaged Drop-In.
  • Client fees are shown before you pay and added on top of the work.

How escrow and approval work · Pricing

FAQ

Questions about hiring Java developers

Is Java still used for new projects?

Yes, especially for enterprise and high-throughput back-end systems.

Java or Kotlin?

Both run on the JVM and work together. Kotlin is more concise; Java has the larger pool of experienced developers.

Can a freelancer join our Java team?

Yes. Hourly or a Dedicated Hire suits working within an existing team.

Related

Related skills

Before you hireWriting the job postReading the proposalsSetting milestones

Post a job for Java developers

Describe the work and compare proposals. You only fund the first milestone once you have chosen someone.

Post a job