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

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