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.