Senior Java Backend Developer

2 weeks ago

Farringdon, Greater London, United Kingdom MarkJames Search 🌍 Full time £60,000 - £100,000 per year

Role: Senior Java Backend Developer

Location: 5 Days onsite in Farringdon London

12 Months contract

About the Role:

We are looking for a highly skilled Senior Java Backend Developer with 6-10 years experience to design, build, and optimize scalable microservices and real-time data pipelines. The ideal candidate will have strong expertise in Java, Spring Boot, SQL Server, MongoDB and streaming technologies like Apache Kafka and Apache Flink. The candidate should be responsible for developing backend services that power high-performance, data-driven applications.

Key Responsibilities:

  • Design, develop, and deploy microservices using Java and Spring Boot.
  • Build and maintain event-driven systems using Apache Kafka (producers, consumers, topics, schema management).
  • Develop and optimize real-time data processing and stream analytics pipelines using Apache Flink.
  • Integrate backend services with SQL Server databases; write efficient SQL queries and stored procedures.
  • No SQL like MongoDB.
  • Ensure application scalability, reliability, and performance.
  • Collaborate closely with DevOps, QA, and Data Engineering teams for smooth CI/CD pipelines and releases.
  • Implement unit and integration tests to ensure code quality and maintainability.
  • Monitor production systems and troubleshoot performance or data issues proactively.
  • Stay updated on new tools, frameworks, and trends in the backend and streaming ecosystem.

Technical Skills Required:

  • Core Java (Java 8 or higher) – strong understanding of OOP, collections, concurrency, and functional programming.
  • Spring Boot / Spring Framework – REST APIs, dependency injection, configuration management, and security.
  • SQL Server – database design, complex queries, indexing, stored procedures, and performance tuning.
  • Experience with NoSQL databases like MongoDB.
  • Apache Kafka – event streaming, consumer groups, offset management, and schema registry.
  • Apache Flink – stream processing, state management, and integration with Kafka or other data sources.
  • RESTful API design and JSON/XML data handling.
  • Git, Maven/Gradle, and CI/CD tools (Jenkins, GitLab CI, etc.).
  • Experience with Docker or Kubernetes (preferred).

Nice to Have:

  • Experience in Global Markets and Regulatory Reporting.
  • Experience with cloud platforms (AWS, Azure, or GCP).
  • Exposure to monitoring tools (Prometheus, Grafana, ELK, etc.).
  • Knowledge of Flink SQL or Kafka Streams.
  • Familiarity with Agile/Scrum development environments.

Soft Skills:

  • Strong problem-solving and analytical skills.
  • Ability to work independently and in cross-functional teams.
  • Excellent communication and collaboration abilities.
  • A passion for clean, maintainable, and efficient code.

Education:

  • Bachelor's or Master's degree in Computer Science, Engineering, or a related field.

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