What does a Java Developer do?

A Java Developer builds and maintains backend applications and services on the JVM, usually with a framework like Spring Boot. They design APIs, work with databases, and write the business logic that powers products, while keeping code clean, tested, and performant under production load.

What are the main responsibilities of a Java Developer?

The core duties are building backend services in Java, designing and integrating databases and APIs, and writing thorough tests. Most Java Developers also tune JVM performance, handle asynchronous processing, and work within CI/CD pipelines to ship and operate their services reliably.

What skills does a Java Developer need?

Strong Java fundamentals and command of the Spring ecosystem are essential, along with solid SQL and database design. Good developers also understand concurrency, testing, and performance tuning on the JVM, and can reason about how services behave in a distributed, high-traffic environment.

What should a Java Developer job description include?

A strong Java Developer job description starts with a clear definition and brief, then lists the key responsibilities, full duties, and required experience and skills. Naming your frameworks, databases, and architecture (monolith or microservices) helps the right candidates self-select.

Who does a Java Developer work with?

Java Developers work with product managers and other backend engineers, and collaborate with frontend developers who consume their APIs. They also partner with DevOps or SRE teams on deployment and reliability, and report into a tech lead or engineering manager who sets priorities.

Engineering

Java Developer Job Description

Software Engineer Frontend Developer Backend Developer Full Stack Developer DevOps Engineer QA Engineer Mobile Developer Engineering Manager Cloud Engineer Security Engineer Site Reliability Engineer (SRE)Android Developer iOS Developer Python Developer Solutions Architect Technical Lead Web Developer

About the role

We are seeking a Java Developer to design and build the backend services that power our products. You will write clean, well-tested Java, work with frameworks like Spring Boot, and help scale systems that handle real production traffic and data. This role fits an engineer who values solid fundamentals, cares about maintainable code, and enjoys solving problems across APIs, databases, and distributed systems.

Key responsibilities

Design and build backend services with Java and Spring Boot
Write well-tested, maintainable, performant code
Design and integrate APIs, databases, and messaging

Responsibilities

Build RESTful and event-driven services using Spring Boot and the Spring ecosystem
Design relational and non-relational schemas and write efficient queries with JPA and Hibernate
Implement asynchronous processing with message brokers like Kafka or RabbitMQ
Write unit and integration tests with JUnit, Mockito, and Testcontainers
Profile and tune JVM performance, garbage collection, and memory usage
Refactor legacy code and pay down technical debt without breaking behavior
Containerize services with Docker and deploy through CI/CD pipelines
Add observability with structured logging, metrics, and distributed tracing
Enforce API contracts, versioning, and backward compatibility
Review pull requests and mentor teammates on Java best practices

Requirements

Bachelor's degree in computer science or equivalent practical experience
3 or more years building backend applications in Java
Strong command of the Spring or Spring Boot framework
Solid understanding of relational databases, ORMs, and SQL
Experience designing and consuming REST APIs in production systems

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