Senior Java Backend Developer

Overview

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.

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