Senior AI Engineer, Engine Reliability

About the role

Supercell is building a new, autonomous Reliability team for its game engine, Titan, which powers some of the highest-grossing mobile games. The team works closely with game teams to give them better infrastructure, AI-driven engineering capabilities and feedback loops. This role sits at the intersection of applied AI, game development and engine programming, turning existing AI capabilities into real engineering value. Candidates can be based in Helsinki or London.

Key responsibilities

• Design, build and ship AI-native engineering capabilities that change how engine and game teams develop, integrate, validate and deliver software.
• Work directly with game teams, sometimes embedding, to understand their workflows, prototype solutions and take them into real-world use.
• Build agentic systems that handle code changes, investigate failures, generate solutions, validate behaviour and give actionable feedback.
• Own evaluation as a first-class discipline: build evals and feedback loops that show whether AI-driven systems deliver reliable results.
• Make autonomous agents trustworthy with guardrails, human checkpoints and observability.
• Build and evolve the reliability infrastructure, including integration validation, automated testing and realistic environments across real devices and services.
• Help shape reusable capabilities across games and set the practices of the new team through code review, pairing and design discussion.

Required profile

• Track record of shipping LLM or agentic applications used in production, not just prototypes.
• Strong, current knowledge of modern generative methods at an applied level, knowing where models break and how to build reliably on top of them.
• Hands-on experience building agent workflows and tool use, made dependable through evals, guardrails and observability.
• Real software engineering depth: writing maintainable code and owning things in production.
• Strong product and engineering instincts, able to turn emerging technology into practical solutions.
• Experience with build systems, CI pipelines, scripting and developer tooling.
• Strong collaboration skills and comfort working with other engineering teams.

Required skills

• Nice to have: games industry experience and mobile game engine or runtime development experience.
• Nice to have: professional C++ experience, enough to read and debug engine and runtime code.
• Nice to have: experience with fine-tuning, model adaptation or distillation.
• Nice to have: debugging cross-platform issues on iOS, Android, macOS or Windows.
• Nice to have: device automation, device farms or test frameworks such as Catch2 or gTest.
• Nice to have: observability tools such as Sentry, logs, metrics or tracing, including AI applied to crash and log analysis.

Relocation support is offered, and the company states that internal job titles do not carry prefixes such as Senior or Principal.