Three Js Developer Jobs in Fairfield, CA (NOW HIRING)

World Labs 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, Justin Johnson and Ben Mildenhall, the company is pioneering world models that perceive, generate, reason, and interact with virtual and physical worlds.

The company's flagship product, Marble, 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.

We're looking for a Senior Product Engineer who thrives at the intersection of product and engineering. You should have strong coding skills across the stack, a deep appreciation for intuitive user experiences, and the technical expertise to design end-to-end systems. In this role, you'll own product features end-to-end-from ideation through to building responsive, user-centric web apps and backend services. Serving as a "player-coach," you will act as the engineering counterpart to product management to help with technical roadmapping and sprint execution. You will bring crucial software engineering and technical leadership experience to support a highly talented product team that currently leans heavily on design.

• Partner directly with product leadership on architectural decisions, sprint planning and technical execution.
• Ship focused, user-facing applications and developer tooling end-to-end, owning frontend, backend, and workflow design.
• Design and build complex workflows around generative models: chained and parallel generation calls, long-running async operations, streaming results, caching, retries, and graceful degradation around inference that takes seconds to minutes.
• Own the deliverable: you set and hold the quality bar for what ships under your name - correctness, performance, polish, and maintainability - and you review others' work to the same standard.
• Work directly with users and design partners; instrument what you ship, watch it get used, and iterate fast.

• 6+ years of software engineering experience (8+ for Staff), with a track record of end-to-end ownership. You've shipped user-facing products, not just components of them, and you've been accountable for their quality in production.
• Deep proficiency in modern web application technologies for the frontend (e.g., TypeScript, React) and backend services, with a strong understanding of web architecture; especially in interactive and real-time applications with performance considerations.
• Fluency with AI-assisted development workflows, grounded in fundamentals strong enough to verify, correct, and own everything you ship - you use the tools to move faster, not to outsource judgment.
• Experience building products on top of asynchronous, long-latency, or streaming APIs.
• A product-minded approach: you form opinions about what users need, validate them cheaply, and change course on evidence.
• Excellent problem-solving abilities and a strong foundation in computer science principles.

While not required, experience in one or more of the following is a strong plus:

• Experience in 3D graphics programming and shader development, particularly web frameworks such as WebGL and three.js.
• Experience building applications around generative image, video, or 3D AI models.
• Contributions to open-source graphics or machine learning projects.
• Experience working in VFX, gaming, 3D design, or other industries that focus on high-fidelity visual outputs.

• 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, World Labs is your launchpad.

Join us, and let's make history together.

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.

California Pay Transparency

In accordance with California law, we disclose the following:

Pay Range

$250-$325k base salary (good-faith estimate for San Francisco Bay Area upon hire; actual offer based on experience, skills, and qualifications)

Total Compensation

Base salary plus equity awards

Salary History

We do not request or consider prior compensation in making offers

Compliance: Cal. Lab. Code 432.3 (pay scale disclosure & salary history ban); Cal. Lab. Code 1197.5 (Equal Pay Act); Cal. Gov. Code 12940 (FEHA); 42 U.S.C. 2000e (Title VII); 29 U.S.C. 621 (ADEA); 42 U.S.C. 12101 (ADA)