What is a Java Developer?

Java is an object-oriented back-end programming language used for web and software development. Its versatility and ease of use make it a near-essential language in enterprises today. Java is used with frameworks and tools such as Spring, Hibernate, Angular, React, AWS, Docker, and J2E/J2EE.

Job profile last updated on 09/06/2026.

What are the missions of a Java developer?

The Java developer has several responsibilities throughout a project's development.
They build new features to evolve the product. They set up the architecture of the IT system, clean up the code and make it more readable. They are also in charge of improving the performance and scalability of the program.

The back-end developer also addresses security challenges to counter cyberattacks and protect data.

Team collaboration

Back-end developers / fullstack devs – Product – Data – DevOps

What are the skills of a Java developer?

Beyond mastering the Java language, a strong developer keeps their stack up to date and stays open to new technologies.

Solid algorithmic knowledge is essential. An affinity for best practices such as TDD (Test-Driven Development) or BDD (Behavior-Driven Development) is highly valued.

Soft skills

The Java developer takes initiative and is not afraid to explore new technologies. Their organizational skills are essential to support projects that require multitasking.

Technologies & platforms used

A Java developer uses a wide range of technologies such as Java, Spring, Spring Boot, Angular, React, Kotlin, Go, Hibernate, AWS, GCP, Docker, Jenkins, and Git to design and build robust, scalable applications.

What training is needed to become a Java developer?

To learn the fundamentals of programming, training in computer science is essential.

Several paths are possible: a university degree (Master's degree in computer science), or a five-year engineering or computer science school program.

A significant amount of self-study is required to stay current with language evolutions throughout a developer's career.

What is the salary of a Java developer?

How can a Java developer's career evolve?

A talented Java developer can move into roles such as Lead Developer, Architect, or even CTO, taking on greater responsibility for the design, management, and direction of technology projects.

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FAQ about the Java Developer role

What is the difference between a Java Developer and a generalist Back-End Developer?

A generalist Back-End Developer can work across several languages depending on project needs (Python, Node.js, Go, PHP). A Java Developer specialises in the Java/JVM ecosystem: they master the language's subtleties (generics, streams, concurrency), Java frameworks (Spring Boot, Hibernate, Quarkus), and architectural patterns specific to enterprise Java applications. This specialisation is highly valued in sectors that have historically relied on Java: banking, insurance, e-commerce, and telecoms.

What is a Java Developer's salary in France in 2026?

A junior Java Developer earns between €38,000 and €50,000 gross per year. A confirmed profile reaches €50,000 to €65,000. A senior exceeds €65,000 to €85,000. Java developers with expertise in Spring Boot, microservices architectures, or financial environments (trading, core banking) can negotiate higher salaries, particularly in large banks and fintechs.

Is Java still relevant in 2026?

Yes. Java remains one of the most widely used languages in enterprise settings, particularly in large organisations (banking, insurance, telecoms, e-commerce). Spring Boot is the most deployed back-end framework in French IT departments. Kotlin, which runs on the JVM and is interoperable with Java, is gaining ground in new applications. Java 21 (LTS) with virtual threads (Project Loom) has modernised the language for highly concurrent applications. The JVM ecosystem remains indispensable for many organisations.

Which Java frameworks are most in demand in 2026?

Spring Boot dominates the market: it is the reference framework for REST APIs and Java microservices. Hibernate/JPA for ORM. Quarkus is gaining ground in cloud-native and Kubernetes contexts (fast startup, low memory footprint). Micronaut is a lightweight alternative. For testing: JUnit 5, Mockito, Testcontainers. Mastery of Maven or Gradle for build management is non-negotiable.

What training leads to a Java Developer career?

Classic paths: engineering school in computer science, a bachelor's/master's in computer science at university, or a specialised Java development course (OpenClassrooms, AFPA, CNAM). Java is often taught from the start of computer science curricula in France. Oracle Java SE certifications are recognised but not mandatory. Working on personal projects on GitHub and contributing to open source Spring or Jakarta EE projects are valued.

What is the difference between Java and Kotlin?

Kotlin is a modern language designed by JetBrains that runs on the JVM and is 100% interoperable with Java. It offers a more concise syntax (less boilerplate), built-in null-safety, coroutines for asynchronous programming, and more modern functional features. A Java developer can learn Kotlin in a few weeks. Kotlin is the standard for Android and is gaining ground in back-end development, particularly with Ktor (JetBrains' Kotlin web framework).

How does a Java Developer adapt to microservices architectures?

The Spring Cloud ecosystem provides all the building blocks for Java microservices: Spring Boot for the services, Spring Cloud Gateway for the API Gateway, Eureka for service discovery, Resilience4j for resilience patterns (circuit breaker, retry), and Spring Cloud Config for centralised configuration. The modern Java developer also masters Docker, Kubernetes (for deploying their services), and message brokers like Kafka or RabbitMQ for asynchronous communication between services.

What roles can a Java Developer progress to?

The most common progressions: Java Lead Developer (technical team management), Java/JEE Architect (system architecture design), Solution Architect (cross-stack vision), Tech Lead, or Engineering Manager. Some progress to CTO roles in companies where Java is at the core of the system. Others specialise in Data Engineering (Spark, Scala/Java for Big Data) or DevOps with a strong JVM culture.