Job Profile: Java Developer | Duties, Skills, Salary 2026

38-70K EUR

Annual gross salary

Bac+2 to Bac+5

Required training

Technology

Sector

Very high

Market demand

About the role

The Java developer is a professional specialised in designing and developing business-critical applications using the Java language and its ecosystem (Spring, Jakarta EE, Hibernate). An expert in object-oriented programming and enterprise architectures, they create robust, scalable and maintainable systems.

In the UK, Java remains one of the most demanded languages, particularly in large enterprises, banks and consulting firms. Java 17 LTS and Java 21 LTS have modernised the language with records, pattern matching and virtual threads.

The role is evolving significantly with cloud adoption (AWS, Azure, GCP), containerisation (Docker, Kubernetes), microservices architectures and reactive programming.

Application design and development

Analyse functional requirements and design technical architecture. Develop robust applications following SOLID principles and design patterns. Create REST or GraphQL APIs to expose services.

Data integration and management

Design and optimise database schemas (PostgreSQL, MySQL, Oracle). Implement persistence layer with JPA/Hibernate or modern frameworks (jOOQ, Spring Data). Manage transactions and ensure data integrity.

Testing and code quality

Write unit tests (JUnit 5, Mockito) and integration tests (Testcontainers, Spring Test). Practice Test-Driven Development. Ensure code quality with SonarQube, Checkstyle, SpotBugs.

Performance and optimisation

Profile applications to identify bottlenecks. Optimise SQL queries and memory management (GC tuning). Implement caching strategies (Redis, Ehcache). Ensure horizontal and vertical scalability.

DevOps and deployment

Containerise applications with Docker. Orchestrate deployments with Kubernetes. Implement CI/CD pipelines (Jenkins, GitLab CI, GitHub Actions). Monitor production applications (Prometheus, Grafana, ELK).

Security and compliance

Implement authentication and authorisation (OAuth2, JWT, Spring Security). Prevent OWASP vulnerabilities (SQL injection, XSS, CSRF). Ensure GDPR compliance and banking security standards.

Technical skills vs soft skills

Avantages

Advanced mastery of Java (8, 11, 17 or 21) and object-oriented programming
Expertise in Spring framework (Boot, MVC, Security, Data, Cloud)
Knowledge of relational databases and advanced SQL
Mastery of JPA/Hibernate and persistence patterns
Understanding of microservices architectures and REST APIs
Knowledge of build tools (Maven, Gradle)
TDD practice and automated testing (JUnit, Mockito)
Basic Docker, Kubernetes and cloud knowledge (AWS, Azure, GCP)
Understanding of SOLID principles and design patterns

Inconvénients

Rigour and attention to code quality
Ability to analyse and solve complex problems
Team spirit and effective communication
Autonomy and proactivity in solution seeking
Continuous learning and technology watch
Ability to work with legacy code and refactor it

Salary scale 2026

Java developer salaries by experience (gross annual)

Experience	Startup/SME	Consulting/Bank	London/SE
Junior (0-2 years)	35-42K EUR	32-40K EUR	+10-15%
Experienced (2-5 years)	42-55K EUR	40-50K EUR	+15-20%
Senior (5-10 years)	55-70K EUR	50-65K EUR	+15-20%
Architect (10+ years)	65-85K EUR	60-80K EUR	+20-25%

Training and careers

Becoming a Java developer

Level	Qualification	Outcomes
Bac+2	BTEC Higher National Certificate, Higher National Diploma	Junior Java developer
Bac+3	Foundation Degree, Bachelor in Computer Science	Java developer
Bac+5	BSc Computing, Computer Science degree, Engineering school	Senior Java developer, Architect
Bootcamp	General Assembly, Career Foundry, Coding bootcamp (3-6 months)	Career change to Java development

Career progression

0-2 years

Junior Java developer

Maintenance, simple features, learning

2-5 years

Java developer

Independent development, design patterns, APIs

5-10 years

Senior Java developer

Architecture, mentoring, technical leadership

8-15 years

Software architect

System design, technology choices

15+ years

CTO / Engineering Manager

Technical strategy, team management

Java remains relevant in 2026

Java 21 (LTS) brings virtual threads, pattern matching and improved performance. Spring Boot 3 facilitates migration to cloud-native architectures. GraalVM enables native compilation for serverless environments. The Java developer who masters cloud and microservices is particularly sought after.

Frequently asked questions about Java developers

Is Java still relevant in 2026?

Yes, Java remains one of the most used languages in enterprise. With Java 17 LTS and 21 LTS, the language has gained modernisation (records, pattern matching, virtual threads). The Spring ecosystem remains essential for enterprise applications. Cloud migrations renew interest in Java. Millions of production lines of code require competent Java developers.

Which Java version should be mastered in 2026?

Java 17 (LTS) is the reference version in 2026, widely adopted in enterprise. Java 21 (LTS released in 2023) is starting to deploy with its innovations (virtual threads, pattern matching). Java 8 and 11 remain present in legacy code. A good developer should know Java 17+ and be able to maintain Java 8/11 code.

Must a Java developer learn Spring?

Spring is the de facto standard in 2026's Java ecosystem. Spring Boot dominates the market for modern applications. Learning Spring (at least the basics) is practically essential for job prospects. The Spring ecosystem includes many specialised projects (Spring Cloud, Spring Security, Spring Data).

Can a Java developer specialise in microservices?

Yes, microservices specialisation is increasingly common. Java is particularly well-suited to microservices with Spring Boot, Spring Cloud, and tools like Docker and Kubernetes. A Java developer specialising in microservices and cloud deployment is highly valued.

Recruit your Java developer with Aurelia

Create an optimised job description and technical interview questions tailored to the level required.

Create my job description