Senior Java Backend Developer

Java Backend Engineer

Employment Type: Full-Time (Permanent)
Location: London, UK (Hybrid 3 days per week onsite at client office)

About the Role

We are seeking a talented Java Backend Engineer to join our client's technology team in London. You will be responsible for designing, developing, and maintaining scalable, high-performance backend applications using modern Java technologies and microservices architecture.

As a Software Engineer, you will contribute to building world-class software solutions through best development practices, reusable components, automation, and continuous improvement. You will work closely with cross-functional teams to deliver robust and reliable applications that support business-critical operations.

Key Responsibilities

• Design, develop, and maintain enterprise-grade backend applications using Java and Spring Boot.

• Build scalable microservices and event-driven systems for high-availability environments.

• Participate in code reviews, testing activities, and quality assurance processes.

• Debug and resolve software defects while ensuring high code quality standards.

• Support software deployment, monitoring, and maintenance across development, testing, and production environments.

• Automate application deployments and CI/CD processes.

• Optimize application performance and scalability based on business demand.

• Collaborate with architects, developers, QA teams, and DevOps engineers throughout the software development lifecycle.

• Contribute to technical documentation and knowledge sharing.

Required Skills & Experience Mandatory Skills

• Strong experience with Java 8+ (Java 11 and Java 17 preferred).

• Solid hands-on experience with Spring Boot.

• Strong understanding of Microservices Architecture.

• Experience with Apache Kafka and event-driven integrations.

• Experience with both SQL and NoSQL databases, including:

  • Oracle

  • PostgreSQL

  • Couchbase

  • Cassandra

• Knowledge of CI/CD and DevOps tools including:

  • Jenkins

  • GitHub

  • Splunk

  • Kibana

  • Grafana

• Experience developing RESTful APIs and distributed systems.

• Strong understanding of Git version control and software development best practices.

• Experience with unit testing and Test-Driven Development (TDD).

• Familiarity with cloud computing concepts and infrastructure technologies.

Preferred Skills

• Experience with GoLang (minimum 1 year preferred but not mandatory).

• Knowledge of reactive programming frameworks such as Vert.x.

• Experience with testing tools/frameworks such as:

  • Cucumber (BDD)

  • JMeter (Performance Testing)

• Experience building high-throughput, high-availability applications.

• Knowledge of caching technologies and strategies.

• Experience working in Agile/Scrum environments.

• Technical certifications related to Java, Cloud, Microservices, or DevOps.

Qualifications

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

• Equivalent professional experience will also be considered.

• Approximately 5 years of hands-on software development experience using the technologies listed above.

Desired Technical Stack

• Java 8 / 11 / 17

• Spring Boot

• Microservices

• Apache Kafka

• REST APIs

• Oracle / PostgreSQL

• Couchbase / Cassandra

• Jenkins

• GitHub

• Splunk / Kibana / Grafana

• CI/CD Pipelines

• Cloud Technologies