Lead Unity SDK Engineer

About the role

LoopMe is an AI company solving one of advertising's hardest problems: making brand advertising actually measurable — and making it perform. Our platform runs patented machine learning models across billions of consumer signals in real time, optimising campaigns toward outcomes like purchase intent, brand lift, and foot traffic rather than proxy metrics like clicks. The result is 2-5x better performance than industry benchmarks, at scale.We operate a high-load programmatic infrastructure — processing millions of ad requests per second with sub-200ms response times globally. This isn't a layer on top of someone else's stack; it's built from the ground up, in-house, by the team you'd be joining. Founded in 2012 and headquartered in London, we now have 400+ people across 19 cities and have sustained 40% revenue CAGR since 2018. The engineering problems here are real, the ownership is genuine, and the scale is significant.

Responsibilities

• Own and operate the entire Unity product surface, with full architectural autonomy and per-platform customisation
• Build and manage open source publishing for LoopMe's Unity packages, applying licensing best practices
• Establish and run CI/CD pipelines for the Unity product surface
• Drive parity between native iOS and Android platforms through proactive cross-team collaboration
• Build generic, reusable tooling that Unity packages across the SDK portfolio can share
• Develop and maintain LoopMe's Unity validator app
• Manage Unity license administration across the SDK organisation
• Partner with QE on cross-platform testing and support integration partners with clear SDK documentation

Requirements

• Experience across cross-platform mobile and SDK development — iOS, Android, and Unity — including dependency resolution and wrapping native code and binaries inside Unity
• Strong architectural background in modular Unity SDK design: dependency injection, bridging native iOS/Android SDKs into Unity through C/C++, and building Unity Editor tooling
• Proficiency in C#, Kotlin, Swift, and Objective-C++
• A track record publishing and maintaining open source software, with working knowledge of licensing and distribution through NPM, NuGet, and Unity Package Manager
• Working knowledge of privacy and consent frameworks used in ad tech — GDPR, CCPA, TCF, GPP, COPPA, CMPs, and App Tracking Transparency

Qualifications

• Familiarity with ad tech industry practices and client-server architecture patterns
• Experience with CI/CD and build tooling such as GitHub Actions, Fastlane, Gradle, or Bazel
• Comfort using agentic coding assistants, such as Claude Code, as part of a development workflow
• Experience with mobile test automation tools such as Maestro, BrowserStack, or TestRail

Benefits

• Remote working
• Self-managed vacation (no maximum)
• 1 month work-from-anywhere
• Healthcare
• 401k
• Summer Fridays
• LoopMe Gives Back
• Learning & development support