Senior Java Engineer - AWS, API - (2 days on site)

Senior Java Developer (AWS, API) - Hybrid - Sussex

Daily rate: £500 - £700 inside IR35

Duration: 6 - 12 months

Hybrid: 2 days per week on site (mandatory Tues, Wed)

Start: ASAP

My new client is looking for 2 highly skilled Senior Java Engineers to join our engineering team. The ideal candidate combines deep technical expertise with strong engineering discipline, independent problem-solving ability, and a commitment to building robust, scalable systems. You will work across modern cloud-native architectures, contribute to API and microservices development, and help drive best practices across the engineering organisation.

Key Responsibilities

• Design, develop, and maintain high-quality Java applications using Spring Boot.
• Build and optimise RESTful APIs and contribute to GraphQL service development.
• Develop cloud-native solutions using AWS services such as Lambda, API Gateway, DynamoDB, ECS, S3, and others.
• Contribute to microservices architecture, event-driven systems, and distributed design patterns.
• Implement CI/CD pipelines using tools such as Jenkins, GitHub Actions, or AWS CodePipeline.
• Work with containerisation technologies (Docker) and orchestration platforms (ECS/EKS).
• Ensure code quality through unit, integration, and automated testing.
• Apply secure coding practices, including OAuth2/JWT authentication and general security best practices.
• Collaborate with cross-functional teams to deliver high-impact features and improvements.
• Participate in code reviews, architectural discussions, and continuous improvement initiatives.

Required Skills & Experience

• Strong proficiency in Java, Spring Boot, and modern backend development.
• Hands-on experience with AWS cloud services (Lambda, API Gateway, DynamoDB, ECS, S3, etc.).
• Solid understanding of RESTful API design and exposure to GraphQL.
• Experience with microservices, event-driven architectures, and distributed systems.
• Familiarity with CI/CD pipelines and DevOps practices.
• Knowledge of Docker and container orchestration fundamentals (ECS, EKS).
• Experience with unit testing, integration testing, and automation frameworks.
• Understanding of security best practices, authentication/authorisation standards (OAuth2, JWT).
• Experience with SOAP/WSDL, JAXB, and legacy service integration.
• Experience with test automation and Cucumber.

Preferred Attributes

• Strong proficiency in software engineering fundamentals, including clean code, design patterns, and maintainable architecture.
• Demonstrated ability to think independently, validate information, and apply sound engineering judgment - including the ability to use AI tools effectively without over-reliance on them.
• Ability to work in a fast-paced environment and contribute to continuous improvement.
• Excellent communication skills and a collaborative mindset.

*Rates depend on experience and client requirements