Sr. Software Development Engineer in Test (Snr SDET)
The Collinson Group4 days ago
Poland (city not specified)Senior
Responsibilities
- Own and evolve test automation frameworks, including building frameworks from the ground up when needed.
- Define test strategy and make decisions about coverage, risk, and release readiness.
- Write and maintain integration, end-to-end, performance, load, regression, and targeted manual tests.
- Build reusable testing utilities, mocks, and simulators and integrate automated testing into CI/CD pipelines.
- Test front-end applications, back-end services, APIs, distributed microservices, shared journeys, service contracts, and integrations.
- Investigate flaky tests, defects, production issues, bottlenecks, and failures, and add coverage to prevent recurring problems.
- Use AI tools and agents to support test design, framework development, test generation, exploratory testing, fuzz testing, and anomaly detection while validating their outputs.
- Develop evaluation approaches for AI-powered features, including prompt regression, output quality, safety, and model-response variability.
- Collaborate with engineers, product managers, and delivery leads to embed quality into requirements and architecture decisions.
- Mentor engineers and testers and coordinate testing across squads.
Requirements
- Demonstrated testing craft through frameworks built, improvements delivered, open-source contributions, or discussable examples.
- Experience designing and maintaining automated integration and end-to-end testing frameworks.
- Experience testing front-end applications, back-end services, APIs, and distributed microservices.
- Experience with performance and load testing and investigating system bottlenecks.
- Practical experience using AI coding assistants or agents, including effective prompting and critical evaluation of generated output.
- Experience with cloud-native testing and AWS environments.
- Experience with infrastructure as code such as AWS CDK.
- Experience with consumer-driven contract testing using Pact.
- Experience evaluating AI-powered features and creating repeatable checks for model behavior.
- Ability to apply engineering judgment, challenge assumptions, investigate failures, and mentor others.
About The Collinson Group
Collinson Group builds travel experience and customer loyalty products for airlines, payment networks, and financial services brands, and sells travel insurance and assistance direct and via partners. Its portfolio includes Priority Pass and LoungeKey airport lounge access, plus loyalty strategy and rewards platforms used worldwide. Privately held and headquartered in London, the company was founded in 1985 and operates across the travel and financial services sectors.