Java (GCP) Developer

Dunton/Basildon Essex (On-site 4 days per week - non-negotiable)
Start: End of April/May 2026
Duration: 8 months
Competitive day rate - up to £590 a day

We are currently seeking a Senior Software Engineer to join a high-performing engineering team within a large-scale, enterprise environment. This role is ideal for a highly experienced backend engineer with a passion for clean code, modern development practices, and delivering high-quality solutions in an Agile setting.

• Design, develop, test, and maintain scalable software applications
• Contribute across the full software development lifecycle, from architecture through to deployment
• Lead and participate in development reviews, ensuring code quality and best practices
• Collaborate closely with cross-functional teams in a highly Agile, pair-programming environment
• Support and mentor junior engineers while managing multiple complex assignments

• Strong background in Agile Java Development
• Expertise in Spring Boot and JUnit
• Extensive hands on experience with TDD and BDD (candidates must be accustomed to applying this in the majority of their development work)
• Proven experience with pair programming (comfortable working this way up to 100% of the time)
• Strong experience designing scalable, resilient, and secure backend architectures
• Deep knowledge of Git/GitHub and CI/CD pipelines (e.g., Cloud Build)
• Experience working with Google Cloud Platform (GCP), including infrastructure as code and cloud-native services
• Strong understanding of architectural standards within large organisations

• Familiarity with tools such as:
  • IntelliJ IDEA (or other JetBrains products)
  • SonarQube (or similar code quality tools)
  • Checkmarx (or similar security testing tools)
  • FOSSA (or open-source compliance tools)
  • Cycode (or software supply chain security platforms)

• Excellent verbal communication skills and strong team collaboration
• A proactive, quality driven mindset with a focus on delivering value
• Ability to work autonomously while contributing to a team first culture
• Comfortable working in a structured, large scale environment

Disclaimer
Notwithstanding any guidelines given to level of experience sought, we will consider candidates from outside this range if they can demonstrate the necessary competencies.
Square One is acting as both an employment agency and an employment business, and is an equal opportunities recruitment business. Square One embraces diversity and will treat everyone equally. Please see our website for our full diversity statement.