ABOUT WORLD LABS World Labs https://www.worldlabs.ai/ is a frontier AI research and product company advancing spatial intelligence, the next frontier beyond large language models. Co-founded by Dr. Fei-Fei Li https://profiles.stanford.edu/fei-fei-li, Justin Johnson https://www.linkedin.com/in/justin-johnson-41b43664/ and Ben Mildenhall https://www.linkedin.com/in/ben-mildenhall-86b4739b/, the company is pioneering world models that perceive, generate, reason, and interact with virtual and physical worlds. The company’s flagship product, Marble https://marble.worldlabs.ai/, transforms text, images, and video into fully navigable 3D worlds, unlocking applications across gaming, film, architecture, robotics, and immersive digital experiences. Backed by leading investors and with over $1B raised, World Labs is assembling a world-class team at the intersection of AI research and real-world deployment. About the Role: We are hiring a Senior Product Engineer who will build and ship new products powered by frontier spatial models. You'll work at the edge of what our models can do, taking ideas from early prototypes to reliable products and APIs that people use, often in weeks rather than months. This role sits at the intersection of product, research and engineering. You'll often be one of the first engineers on a new product idea. You'll own its technical direction and how the model behaves in the product, and you'll build the evals that show whether users get results they can use. We’re looking for someone who enjoys ambiguity, works comfortably across the stack, and wants to get new capabilities in front of real users quickly. What You Will Do - Explore emerging model capabilities with researchers and identify valuable product workflows before a complete specification exists. - Own model behavior in the product, including prompting, conditioning, parameter choices, orchestration, and failure-mode diagnosis. - Build product evals that measure whether users receive usable results. - Ship across the necessary layers: backend or orchestration, public API/SDK and user-facing product. - Work directly with users and own the quality and reliability of what you ship after launch. What we are looking for - 5+ years of professional software engineering experience, with demonstrated ownership across full stack development. - You have shipped a production API or application on top of generative models and owned end-to-end output quality, not only the surrounding plumbing. - You have a meaningful backend or systems depth and can work through the user-facing surface. - You have built or used evaluations for nondeterministic systems and know where those evaluations can mislead you. - You have worked closely with researchers and can turn product evidence into a precise capability request. - You act without waiting for fully specified tickets, while aligning clearly on the product bet and constraints. Bonus points for: - 3D, graphics or vision experience - Public API or SDK experience - Fine-tuning, LoRA or adapter experience - Founding or early-engineer experience WHO YOU ARE - Fearless Innovator: We need people who thrive on challenges and aren't afraid to tackle the impossible. - Resilient Builder: Impacting Large World Models isn't a sprint; it's a marathon with hurdles. We're looking for builders who can weather the storms of groundbreaking research and come out stronger. - Mission-Driven Mindset: Everything we do is in service of creating the best spatially intelligent AI systems, and using them to empower people. - Collaborative Spirit: We're building something bigger than any one person. We need team players who can harness the power of collective intelligence.   We're hiring the brightest minds from around the globe to bring diverse perspectives to our cutting-edge work. If you're ready to work on technology that will reshape how machines perceive and interact with the world - then World Labs is your launchpad. Join us, and let's make history together. Logistics: Location: This role is based in San Francisco, California; we work in-person in the office 5 days a week. Visa sponsorship: We sponsor visas. While we can't guarantee success for every candidate or role, if you're the right fit, we're committed to working through the visa process together. Benefits: We offer generous health, dental, vision and 401K benefits, flexible PTO, paid parental leave, and relocation support as needed.   Equal Employment Opportunity World Labs is an equal opportunity employer. We do not discriminate on the basis of race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, genetic information, veteran status, or any other characteristic protected under applicable law. We welcome all qualified applicants and are committed to providing reasonable accommodations throughout the hiring process upon request.