Senior AI Engineer, Engine Reliability

Supercell; Helsinki; On-site; EUR 90,000 - 150,000; Full time

Job summary

Supercell in Helsinki is building a new Reliability team to fuse AI-native engineering with game development. You’ll design and ship AI-enabled capabilities that improve how our engine and game teams develop, validate, and deliver software across platforms.

Based in Helsinki or London, you’ll collaborate with game teams, build agent workflows, and ensure robust evals, guardrails, and observability. This is a chance to shape reliability infrastructure for AI-driven development at scale.

Qualifications

• Shipping LLM/agentic applications in production.
• Strong, practical knowledge of applied generative methods.
• Hands-on with agent workflows and guardrails.
• Real software engineering depth; write maintainable production code.
• Strong product & engineering instincts to turn tech into practical solutions.
• Experience with build systems, CI pipelines, scripting, and developer tooling.
• Collaborating with game teams to drive adoption and impact.

Responsibilities

• Design, build, and ship AI-native engineering capabilities that change how our engine and game teams develop, integrate, validate, and deliver software.
• Work directly with game teams, embedding with them to understand workflows, prototype solutions, and take them into real-world use.
• Build agentic systems that can take on complex engineering work, from understanding code changes to generating solutions with validation.
• Own evaluation as a first-class engineering discipline with evals and feedback loops.
• Make autonomous agents reliable enough to trust with real work, with guardrails and observability.
• Build and evolve the underlying reliability infrastructure for AI-driven development across devices and services.
• Think beyond individual tools to reusable capabilities across games.

Skills

LLM apps

Generative AI

Agent workflows

Production code

Collaboration

CI pipelines

Tools

Catch2

gTest

Sentry

CI pipelines

Job description

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 in 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 closely with our engine and game teams, empowering them to work safer, faster, and easier through better infrastructure, AI-driven engineering capabilities, and feedback loops.

AI is fundamentally changing how software is built, and we believe it will transform how games are made at Supercell. As AI agents take on more of the development process, the challenge isn't simply moving faster – it's building the confidence to do so. We're creating an AI-native Reliability team to help make that future possible, rethinking how we develop, validate, debug, and understand the impact of changes across real games. Our ambition goes far beyond better testing and automation: we're building the foundations for a world where engineers and AI agents can experiment, develop, and ship with a level of speed and confidence that simply isn't possible today.

A big part of how we work is through deep partnerships with our game teams. We don't want to build technology in isolation and hand it over for others to adopt. We work alongside the teams building and operating our games, understanding their challenges firsthand, experimenting together, and developing solutions that genuinely change how they work. We want to build capabilities that scale across Supercell while giving individual game teams the freedom to adapt and extend them to their own needs.

This role sits at the intersection of applied AI, game development, and engine programming. The challenge is the distance between a demo and a system that engineers trust: the evals that tell you it's actually working, the cost and latency that make it viable, and the failure modes you find before anyone else does. We're not looking for someone who wants to train a frontier model. We're looking for someone who gets unreasonable results out of the ones that exist, and knows how to turn emerging AI capabilities into real engineering value.

Did you know we have our own game engine? This article explains why you've probably never heard of Titan, while this more technical article is about making Brawl Stars toilet break-friendly.

What You'll Be Doing

• Design, build, and ship AI-native engineering capabilities that change how our engine and game teams develop, integrate, validate, and deliver software.
• Work directly with game teams, sometimes embedding with them, to understand their workflows, identify opportunities, prototype solutions, and take them all the way into real-world use.
• Build agentic systems that can take on increasingly complex engineering work, from understanding code changes and investigating failures to generating solutions, validating their behaviour, and providing actionable feedback.
• Own evaluation as a first-class engineering discipline. Build the evals and feedback loops that tell us whether our AI-driven systems are actually delivering reliable, useful results.
• Make autonomous agents reliable enough to trust with real work, with the right guardrails, human checkpoints, and observability.
• Build and evolve the underlying reliability infrastructure that makes AI-driven development possible, including integration validation, automated testing, and realistic environments across real devices and services.
• Think beyond individual tools. Help shape reusable capabilities that work across games while allowing teams to build and adapt their own solutions.
• Use judgment on where AI adds leverage, where deterministic approaches win, and where emerging technologies could fundamentally change how we work.
• Help set the practices of a new team as it grows, and raise the technical bar through code review, pairing, and design discussion.

What You Have

• A track record of shipping LLM or agentic applications that real users used in production, not just prototypes.
• Strong, current command of modern generative methods at the applied level: you know what today's models are good at, where they break, and how to build reliably on top of them.
• Hands-on experience building agent workflows and tool use, and making them dependable through evals, guardrails, and observability.
• Real software engineering depth. You write code others can maintain, and you own things in production.
• Strong product and engineering instincts, with the ability to understand a team's problems, challenge assumptions, and turn emerging technology into practical solutions.
• Experience with build systems, CI pipelines, scripting, and developer tooling.
• Strong collaboration skills and comfort working closely with other engineering teams, navigating ambiguity, and driving work from early exploration through to adoption without adding unnecessary process overhead.

Would Be Nice if You Also Have

• Games industry experience, and a real appreciation for mobile.
• Game engine or runtime development experience, and credibility with engine engineers.
• Professional experience with C++, enough to read and debug engine and runtime code.
• Experience with fine-tuning, model adaptation, or distillation, and the judgment to know when not to reach for it.
• Experience debugging cross-platform issues on iOS, Android, macOS, or Windows.
• Experience with device automation, device farms, or test frameworks such as Catch2 or gTest.
• Experience with observability tools such as Sentry, logs, metrics, or tracing, including applying AI to crash and log analysis.
• Experience improving testability or reliability in shared engine or platform code.

Where You'll Be

You can be based either in Helsinki or London.

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That's it about the role! Below, we've gathered some things we feel are important for you to know. Totally optional, but a highly recommended read.

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About Supercell

Supercell is a games company from Helsinki, Finland, with offices also in San Francisco, Seoul, Shanghai, and London. You might know us as the makers of Hay Day, Clash of Clans, Boom Beach, Clash Royale, and Brawl Stars .

So, how do we make great games? By putting together the best teams and giving them the freedom and independence to succeed. And by taking risks, failing, sharing learnings, and killing lots of projects.

Hey, You Might Love It Here!

Independent cells and trust are at the core of our culture. But it takes more than that to make great games. We take good care of our people, providing them with the compensation, work environment, and resources they need to succeed while having fun along the way.

You Are Not Your Job Title TM

Here, you won’t need to focus on chasing titles or climbing ladders. Internally, our job titles don’t include prefixes like Senior, Junior, Principal, or Director. Recognition isn’t tied to your title, as it doesn't define the impact you can have around here.

Benefits and Compensation

Luring you in with glitter, glamour, and gems isn't what we're about. We want you to enjoy your time here fully, so we structure our compensation and benefits with that in mind. It starts with perceiving you as a human being, not a resource.

Relocation? Yes!

No matter where you’re moving from, our dedicated mobility team and partners will support you throughout your move. We’ll ensure the process is as smooth as possible for you and anyone joining you – whether they’re family members of the human or animal kind!

Not Sure if You Should Apply?

Many candidates with great skills and experience second-guess themselves. The bar is high, but if this role excites you, we’re here to help you succeed. Also, we’re happy to learn about any specific accommodations you may need to fully engage in our recruitment process.

Wishing you all the best,
The Supercell Recruitment team