Location
Zürich Switzerland
Switzerland
Zürich Switzerland
Switzerland
Salary
(Yearly)
(Yearly)
(Yearly)
(Yearly)
(Yearly)
Salary information is not provided for this position.
Undisclosed
-
Category
Software Engineer
Date posted
July 28, 2025
Job type
Full-time
Experience level
Mid level

Job Description

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.

👉 Let's stay connected! Follow us on LinkedIn, Twitter & Instagram to learn more about what is happening at Lakera.

ℹ️ Join us on Momentum, the slack community for AI Safety and Security everything.

❗To remove your information from our recruitment database, please email privacy@lakera.ai.

Apply now
Lakera AI is hiring a Senior Software Engineer - Gandalf. Apply through Homebase and and make the next move in your career!
Apply now
Companies size
51-100
employees
Founded in
2021
Headquaters
San Francisco, CA, United States
Country
United States
Industry
Software Development
Social media
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