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 Do 

• 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

Benefits and Compensation
Luring you in with glitter, glamour, and gems is not what we seek to do. We develop Supercell as an employer for you to do your best work and to call this the best experience in your professional life.
We want you to enjoy your time here fully, so we structure our compensation and benefits to serve this purpose. It starts with perceiving you as a human being, not a resource. Read More

About Supercell
We are a games company based in Helsinki, Finland, with offices in San Francisco, Seoul, Shanghai, and London. Since our launch in 2010, we've released seven games globally – Hay Day, Clash of Clans, Boom Beach, Clash Royale, Brawl Stars, Squad Busters, and mo.co.
To make seven games, we've killed dozens along the way. That's because we're obsessed with quality. Our mission is to create great games that as many people as possible play for years and that are remembered forever. To achieve this goal, we put together the best possible teams and give them the freedom and independence to succeed. Read More

You Might Love It Here...
If you love games, Supercell is the place for you. We're made up of proactive, independent teams that have the freedom to do what they think is best for their players, our games, and the company.
We know it takes more than trust and independence to make great games, so we also take good care of our people, providing them with the compensation, work environment and resources they need to succeed and have fun while at it. Read More

You Are Not Your Job Title
Working with us means you won’t need to focus on chasing titles or climbing ladders. We’ve decided that our internal job titles don’t include prefixes like senior, junior, principal, or director. Instead, we embrace our non-hierarchical culture, allowing us to concentrate on what truly matters: doing what’s best for our players. Recognition isn’t tied to your job title, nor does your title define the impact you can have.
For hiring purposes, we do use industry-standard job titles to help attract talent. When it comes to public-facing spaces like LinkedIn, we trust and encourage everyone to select a title that feels most appropriate for them. Read More

This position is in Helsinki, but you're not?
Luckily, moving to Helsinki is easier than you might think. No matter where you would be moving from, our dedicated people will help you from beginning to end. We're here to ensure the process is as smooth as possible for you, your family and whoever and whatever you bring along. In addition to cats and dogs, we've even relocated a horse. Read More

Not sure if you should apply? 
Do it! You might feel like you don't tick all the listed requirements with stellar scores. That's fine! We're here to help you succeed. Also, we're happy to learn about any specific accommodations you might require to fully engage in our recruitment process.

And here's a video about what we do. (Best enjoyed with salmiakki and rye bread)