Senior Programmer, Engine Reliability in London

Our engine, Titan, powers some of the highest-grossing games in mobile – titles that have generated billions in revenue and reach hundreds of millions of players. We are investing heavily into the future of Titan, and as part of that investment we’re building a brand-new Reliability team: an autonomous, high-skill group that will work alongside our engine teams, empowering them to work safer, faster, and easier through better infrastructure, automation, and feedback loops.

The role that Reliability plays is crucial to the success of Titan’s future. As agentic workflows become more common the pace of iteration rises, and confidence in what we ship becomes the bottleneck. We see this team as a strategic bet in solving that problem — building the validation surfaces, automation, and reliability loops that help our engine teams move faster without increasing risk to what matters most – our games and players.

This is an AI-forward engineering team by design. We are not treating AI as a side tool; we are building around the reality that modern engineering will increasingly depend on AI-assisted workflows for validation, automation, and test generation — with strong engineering judgment and clear guardrails.

This role is client-leaning, focused on the engine and runtime: C++, mobile platforms, runtime behaviour, performance, and the practical challenges of validating shared engine changes before they reach games.

• Build & evolve automated reliability foundations: including validation workflows, regression detection, integration stability, and performance/stability signals.
• Establish and grow realistic end-to-end validation surfaces across real devices and real services, so issues are caught before they reach games.
• Improve how shared engine changes are validated against real game integrations, reducing manual pain and making confidence more repeatable.
• Create and maintain tooling, infrastructure, and test surfaces that engine and horizontal teams can rely on.
• Partner with client, server, and live-ops teams to make systems testable and reduce surprises.
• Apply modern AI-assisted workflows to validation, automation, and test generation in pragmatic, well-guardrailed ways.
• Contribute directly to priority technical work where improving testability or validation unlocks broader reliability gains.

What You Have

• Strong professional experience in modern C++.
• Engine/runtime development experience, with comfort debugging complex cross-platform issues across platforms such as iOS, Android, macOS, or Windows.
• Strong instincts around testing and validation strategy: you understand the trade-offs between unit, integration, and end-to-end testing, and where each creates the most value.
• Experience with build systems, automation, and developer tooling such as CMake, CI pipelines, and scripting.
• Strong collaboration skills and the ability to work effectively across teams without adding unnecessary process overhead.
• Interest in AI-assisted engineering workflows, with good judgment about where they add leverage and where they need guardrails.
• Comfort operating in an ambiguous space and helping shape a new team’s practices as it grows.

Would Be Nice if You Also Have

• Experience with device automation, device farms, or test frameworks such as Catch2 or gTest.
• Experience with observability and debugging tools such as Sentry, logs, metrics, tracing, or dashboards.
• Experience improving testability, validation, or reliability in shared engine or platform code.
• Experience working across client and backend workflows, even if your main background is client-side.
• Hands-on experience using AI-assisted development tools as part of day-to-day engineering work.

Where You'll Be

You can be located either in London or Helsinki.

Benefits and Compensation

Compensation and benefits are structured to care for you as a person, not just as a resource.

Relocation Support

Our mobility team will support your relocation process, wherever you move from.