Software Development Engineer – Test
Light
full-time
Posted on:
Location Type: Hybrid
Location: London • United Kingdom
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Tech Stack
About the role
- Design and implement test frameworks, fixtures, and data management patterns.
- Build strategies for realistic, safe test data in a fintech context.
- Standardize how teams at Light write, run, and maintain tests.
- Build quality gates in CI/CD and implement test observability.
- Write tests in high-risk areas to model best practices.
- Coach engineers across all teams on test design and adopt new practices.
- Build evaluation frameworks for AI features for high confidence deployments.
Requirements
- Significant experience building test infrastructure and tooling, not just writing tests.
- Comfortable working across multiple languages including Kotlin, TypeScript, and Python.
- More satisfaction from unblocking engineers with a great tool than from shipping a single feature.
- You hate flaky tests and understand the importance of trust in test adoption.
- Ability to influence without authority and change team dynamics with patience and clarity.
- Experience building evaluation frameworks for LLM-based systems and understanding non-deterministic outputs.
Benefits
- A competitive salary + potential stock options
- 25 days of annual leave + public holidays in the country where you are based.
- Regular socials and company off-sites
- A huge opportunity for career growth as you'll help shape a market-defining product.
Applicant Tracking System Keywords
Tip: use these terms in your resume and cover letter to boost ATS matches.
Hard Skills & Tools
test frameworksdata management patternsCI/CDtest observabilityKotlinTypeScriptPythonevaluation frameworksLLM-based systemsnon-deterministic outputs
Soft Skills
coachinginfluencing without authoritypatienceclarityteam dynamicsunblocking engineerstrust in test adoption