SDET for AI-Driven SDK Quality & CI/CD

LEGO Digital Play; Greater London; On-site; GBP 65,000 - 90,000; Full time

Job summary

LEGO Digital Play in London HQ is seeking a Software Development Engineer in Test to build test automation frameworks for our SDKs. This newly created role reports to the Lead Engineer, Development Platform, and is based in our London HQ.

We are looking for someone who can develop and run unit, integration, contract, end-to-end and performance tests, and who can apply AI-assisted testing while maintaining robust CI/CD pipelines.

Qualifications

• Strong hands-on software engineering experience; treat test automation as software engineering.
• Proven experience designing and building test automation frameworks from the ground up.
• Proficiency in modern testing approaches: test pyramid, shift-left, contract testing, risk-based design.
• Hands-on experience building and maintaining CI/CD pipelines and integrating automated testing.
• Demonstrated experience using AI tools in testing or engineering workflows.
• Strong debugging and troubleshooting skills across platforms, versions and configurations.
• Fluency in languages used for test automation (C#, Python, TypeScript, Java).
• Excellent communication; explain quality trade-offs clearly to engineers.
• Sound judgement and comfort with ambiguity; define testing strategy where none exists.
• Awareness of safety, privacy, IP, compliance obligations in test coverage.
• Experience testing SDKs
• Experience with Unity or game engines testing
• Performance, load, reliability testing at scale
• Security testing in pipelines
• Evaluating/testing tools or vendors
• Compliance requirements for children's data
• Early-stage quality practice establishment

Responsibilities

• Design and maintain test automation frameworks for the platform's SDKs, APIs, libraries and services.
• Develop and run unit, integration, contract, end-to-end and performance tests with meaningful coverage.
• Build and own CI/CD test pipelines with fast, deterministic quality gates.
• Apply AI-assisted testing to generate and triage tests.
• Diagnose failures across versions, platforms and configs to reduce instability.
• Establish reliability and observable metrics for test estates.
• Collaborate with SDK and platform engineers to bake testing into designs.
• Uphold safety, privacy, IP obligations in test design.

Skills

Hands-on software engineering

Test automation frameworks

Modern testing approaches

CI/CD pipelines

AI-assisted testing

Debugging across platforms

Programming languages

Communication

Testing strategy under ambiguity

Safety and compliance awareness

SDK testing experience

Unity/game engines testing

Performance and reliability testing

Security testing in pipelines

Tools/vendor evaluation

Compliance for children's data

Quality practices in early-stage setup

Job description

LEGO Digital Play in London HQ is seeking a Software Development Engineer in Test to build test automation frameworks for our SDKs. This newly created role reports to the Lead Engineer, Development Platform, and is based in our London HQ.

We are looking for someone who can develop and run unit, integration, contract, end-to-end and performance tests, and who can apply AI-assisted testing while maintaining robust CI/CD pipelines.