Principal LLM Engineer

Supercell is looking for an entrepreneur disguised as an engineer — someone who’s obsessed with building real things, thrives on autonomy, and is energized by big, undefined problems.

We want a person who treats AI as a playground for creation — who can imagine bold applications, prototype fast, and ship production-grade systems that change how we work and play. Someone who wants to set the standard for what “great” looks like in LLM engineering — and who’s excited by the idea of doing it inside one of the most creatively free companies in the world.

About the Role

Supercell’s AI team drives the company-wide AI agenda — from internal automation to player-facing agents. Supercell is famous for small, independent teams that build global hits. That same philosophy drives our approach to AI: we give exceptional people the freedom, trust, and resources to explore ambitious ideas and turn them into reality.

We’re now preparing for a future where humans and AI teammates work seamlessly side by side — building, creating, and experimenting together.

We’re looking for a Principal LLM Engineer who’s excited to help define that future: a hands-on builder who can turn ideas into production systems, and a craft leader who raises the bar for everyone around them.

What You’ll Be Doing

• Build and ship bold ideas: Design, prototype, and deliver production-grade LLM and agentic systems — from creative tools to intelligent in-game and internal agents.

• Own the craft: Define how we design, evaluate, and scale LLM applications across Supercell. Set the bar for quality, reliability, and creativity.

• Move fast and take risks: Try new frameworks, break things safely, and push the limits of what’s possible with emerging models and tools.

• Collaborate like a founder: Work closely with game teams, engineers, and artists to find high-impact opportunities — and make them real.

• Inspire and enable: Help others across Supercell build confidently with AI, sharing insights, frameworks, and reusable components.

What We’re Looking For

• Proven track record building production LLM or agentic applications — ideally shipped or widely used.

• Deep technical grounding in Python, APIs, orchestration, evaluation, monitoring, and modern LLM frameworks (LangChain, LlamaIndex, OpenAI, Anthropic, vLLM, etc.).

• Entrepreneurial mindset: You’ve built from scratch, taken bets, and thrived in environments with freedom and ambiguity.

• Strong product sense and creativity — able to turn vague ideas into concrete, delightful experiences.

• Excellent communicator and evangelist — you bring others along and create excitement.

• Curiosity and appetite for risk and experimentation. You move fast and learn faster.

• Bonus: interest in games, creativity, or building tools that empower others.

Why This Role

This is a rare opportunity to be a founding builder at the heart of Supercell’s AI transformation — where ambition is celebrated, risk is rewarded, and freedom is real.

You’ll shape how AI is built and used across one of the world’s most successful independent game companies — with a blank canvas, a huge impact surface, and a team that shares your drive to do something truly new.

Relevant technologies and platforms

• LLMs: GPT, Claude, Llama, Mistral, Gemma

• Agent technologies: OpenAI Agents & GPTs, Anthropic Agents, MCP, LangGraph, Amazon Bedrock Agents

• ML: PyTorch, TensorFlow, ONNX

• Data: Python, Databricks, Spark

• Cloud: AWS, GCP

• Infra: Docker. Kubernetes, Redis

• Vector databases: Pinecone, Chroma, pgvector

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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.

Once you're ready to apply, just send us your application through the form at the bottom of the page.

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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, Brawl Stars, and Squad Busters. Our mission is to create great games that as many people as possible play for years and that are remembered forever.

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 ™

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, apply! 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

P.S.
Here's a video about what Supercell is about.
Best enjoyed with salmiakki and rye bread!