Senior Java Engineer; AWS, REST, SOAP – Hybrid

Senior Java Engineer (AWS, REST, SOAP) - Hybrid - Sussex Daily rate: £500 - £700 (inside IR35) Duration: 6 months Hybrid: 2 days per week (Tues + Wed) Start: ASAP My new client is looking for a highly skilled Senior Java Engineer to join their 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.

• Design, develop, and maintain high‑quality Java applications using Spring Boot.
• Build and optimise RESTful APIs and contribute to Graph
  
  QL service development.
• Develop cloud‑native solutions using AWS services such as Lambda, API Gateway, Dynamo
  
  DB, ECS, S3, and others.
• Contribute to microservices architecture, event‑driven systems, and distributed design patterns.
• Implement CI/CD pipelines using tools such as Jenkins, Git Hub Actions, or AWS Code Pipeline.
• 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.

• Strong proficiency in Java, Spring Boot, and modern backend development.
• Hands‑on experience with AWS cloud services (Lambda, API Gateway, Dynamo
  
  DB, ECS, S3, etc.).
• Solid understanding of RESTful API design and exposure to Graph
  
  QL.
• Experience with microservices, event‑driven architectures, and distributed systems.
• Familiarity with CI/CD pipelines and Dev Ops 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.

• 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