SDK Engineer for Game Engines & DevTools

LEGO Digital Play; Greater London; On-site; GBP 90,000 - 130,000; Full time

Job summary

LEGO Digital Play in London is seeking a Software Engineer to build game engine SDKs and create content for developers. You will report to the Head of Developer Platform and design, implement, and maintain SDKs for Unity and other engines, while ensuring robust packaging for iOS/Android and strong developer tooling.

This role emphasizes collaboration across teams, building CI/CD pipelines, documenting APIs, and applying AI-assisted coding practices to deliver high-quality, scalable SDKs that

Qualifications

• Degree in computer science or a related discipline, or demonstrated equivalent capability through professional practice
• Experience working across different engineering team disciplines in a highly collaborative environment
• Solid hands-on software engineering experience across the full development cycle, with the range to work as a generalist
• Practical experience developing with the Unity engine, including plug‑in or package development and working within the editor
• Experience building and shipping software for mobile devices, including packaging and platform‑specific concerns for iOS and Android
• Demonstrated experience using AI tooling for code in real development work, with sound judgement about where it helps
• Hands‑on experience with CI/CD: designing or maintaining automated build, test and release pipelines
• A strong testing practice: writing unit and integration tests and validating behaviour on target devices
• Ability to write clear technical documentation for other developers
• Comfort with ambiguity: able to take a loosely defined problem, work out what it needs and deliver a working result
• Clear, structured communication; able to work closely with backend and infrastructure engineers and explain SDK trade‑offs plainly

Responsibilities

• Design, build and maintain the Unity, Unreal and other SDKs for our platforms: plug-ins and packages that expose platform services to developers through clean, stable and well-versioned APIs
• Package and validate code packages for target mobile devices including iPhone and Android; own build configuration, platform-specific behaviour and compatibility across supported OS versions and hardware
• Build developer-facing tools inside the editors that make the platform easier to adopt, integrate and debug; treat developer experience as a first-class deliverable
• Write and maintain clear SDK documentation, integration guides and code samples; keep them accurate and in step with each release
• Design and maintain CI/CD pipelines for the SDK: automated builds, packaging, versioning and release across supported platforms
• Own testing for the SDK: unit, integration and on-device testing; build the harnesses and fixtures that let the team ship changes with confidence
• Use AI coding tools effectively in day-to-day development and help establish sensible team practices for reviewing, validating and trusting AI-assisted output
• Support the platform's safety, brand integrity and IP obligations at the SDK layer: sensible defaults, safe API surfaces and controls that hold as the SDK is adopted more widely

Skills

Unity engine

CI/CD

AI tooling for code

Technical documentation

Collaborative cross-team work

C# + .NET

Productivity tooling

Education

Degree in computer science or related field

Tools

Unity plug-in development

Unreal Engine

Editor extension tooling

Mobile packaging (iOS/Android)

CI/CD tooling

Job description

LEGO Digital Play in London is seeking a Software Engineer to build game engine SDKs and create content for developers. You will report to the Head of Developer Platform and design, implement, and maintain SDKs for Unity and other engines, while ensuring robust packaging for iOS/Android and strong developer tooling.

This role emphasizes collaboration across teams, building CI/CD pipelines, documenting APIs, and applying AI-assisted coding practices to deliver high-quality, scalable SDKs that