Senior Software Engineer - Gandalf

Senior Software Engineer – Gandalf

Lakera is on a mission to secure the era of intelligent software. At the heart of this mission is Gandalf. the world’s most popular AI security game, played by millions globally. Gandalf isn’t just a viral success. It's become a proving ground for adversarial testing of LLMs and a cornerstone of how the world learns about AI safety.

We're now looking for a Product-Focused Software Engineer to take Gandalf to the next level. This is a rare opportunity to own a beloved product with massive reach and shape its future. You’ll work at the intersection of gaming, UX, and cutting-edge AI building immersive, secure, and delightful experiences that people actually love.

What you’ll do

• Own the end-to-end product development of Gandalf. From gameplay mechanics, frontend and backend scalability.

• Partner with researchers and product leads to prototype, test, and launch new game modes and features.

• Shape and implement the user experience: animations, transitions, performance, and polish the details that turn a toy into magic.

• Make Gandalf more social, more replayable, and more extensible. Think real-time competition, player profiles, in-game progress, and more.

• Help define the roadmap, not just execute it — your product sense matters here.

• Drive massive product impact: Gandalf isn't just about building great games, it's a core surface through which we test, validate, and improve our models. The work you do here directly shapes model performance, product quality, and ultimately business outcomes.
  

You might be a fit if you

• Have strong frontend skills (React, TypeScript) and solid backend engineering chops (e.g., Python, Next.js, Firebase, or similar).

• Thrive in zero-to-one product environments and want real ownership.

• Are passionate about games, user experience, and AI and love building things people can’t stop using.

• Think like a product builder: you care about outcomes, not just code quality.

• Can move fast independently but collaborate deeply across teams.

Bonus points for

• Experience working on games, interactive web experiences, or viral consumer products.

• Working knowledge of LLMs or prompt injection (you’ll learn fast if not).

• A track record of building side projects or launching products end-to-end.
  

Why this role?

• Massive visibility: Gandalf is already a viral hit. You'll shape what millions interact with next.

• Fast-moving, product-first team: No bureaucracy. No silos. Just you and a small team building the future.

• Deep mission: At its core, Gandalf helps the world understand and secure AI. It’s fun but it matters.

• Foundational seat: This is not a maintenance role. You’re here to invent.
  

Apply now to build the most loved and most important game in AI.

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