Senior Front-end Software Engineer ( React, Bazel And Java )

Senior Front-end Software Engineer ( React, Bazel and Java) ** YOU MUST LIVE IN THE UK- ALSO SPONSORSHIP IS NOT PROVIDED** The organisation manages the test infrastructure and tooling that underpin its client applications. The mission is to provide a reliable, consistent and efficient testing ecosystem that enables engineers to validate their code with confidence and ship high‑quality products. The systems are continually evolving to improve developer experience, reliability and automation through well‑designed services, tooling, documentation and support. The engineering group is migrating its entire client platform application into a Bazel‑based monorepo, so experience in that environment is highly valued.

They are looking for a platform‑minded full‑stack engineer with strong data and infrastructure instincts. In this role, you’ll use your curiosity and adaptability to build and improve the test infrastructure that supports all client platforms. This includes web‑focused test frameworks, data pipelines, backend services and internal developer tooling.

What You’ll Do

• Contribute to the ongoing migration to a Bazel‑driven monorepo
• Shape and drive the technical roadmap for the test infrastructure environment
• Improve testing practices across the engineering organisation
• Support engineers to drive test automation and remediate debugging failures

Must Haves

• Strong in  React ,  Bazel and  Java (the three core skills )
• Comfortable using  AI agents (Claude, Cursor, etc.) to enhance development and tooling
• Skilled with modern web application test tooling (Mocha, React, WebdriverIO)

Preferred Skills

• Proficient in Java backend services (Apollo + PostgreSQL preferred)
• Familiar with CI pipelines and infrastructure tooling
• Experienced with automated testing and scalable test systems
• Comfortable working across multiple codebases and domains when needed
• Strong understanding of software architecture and design principles

Job Title: Senior Front-end Software Engineer ( React, Bazel And Java )

Location: London, United Kingdom

Job Type: Contract

Trading as TEKsystems. Allegis Group Limited, Maxis 2, Western Road, Bracknell, RG12 1RT, United Kingdom. No. 2876353. Allegis Group Limited operates as an Employment Business and Employment Agency as set out in the Conduct of Employment Agencies and Employment Businesses Regulations 2003. TEKsystems is a company within the Allegis Group network of companies (collectively referred to as “Allegis Group”). Aerotek, Aston Carter, EASi, Talentis Solutions, TEKsystems, Stamford Consultants and The Stamford Group are Allegis Group brands. If you apply, your personal data will be processed as described in the Allegis Group Online Privacy Notice available at https://www.allegisgroup.com/en-gb/privacy-notices.

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