Product Web Developer Engineer

Sonoma, California

Stealth AI Startup
Job Expired - Click here to search for similar jobs

Help craft intelligent, opinionated interfaces that don't just look magical-they are.


About Noumena

Noumena is an AI research lab and product company focused on usable intelligence. We're building tightly integrated systems that reason, adapt, and evolve in context-starting with tools we use ourselves to accelerate research and product development. These tools generate high-signal feedback loops that power the training of the next generation of high-performance, specialized models.


We design, own, and operate the full stack-from infrastructure to interface. Every layer is designed to work together, compounding in capability, precision, and feedback over time. The result is not just smarter models-but systems that actually work in practice.


About the Role

We're hiring a Product Web Developer Engineer to lead the design and implementation of our core user-facing product experiences-interfaces where real-time model capabilities meet complex, high-leverage workflows.


You won't just be consuming APIs or polishing views. You'll be building the system where model outputs become usable intelligence: structured, opinionated interfaces that evolve with both user needs and model behavior.


We're currently focused on coding and planning tools for high-agency users-engineers, researchers, and designers pushing the edge of what AI can actually do. You'll help define the experience layer that makes that possible.


What You'll Own

  • Architect and implement real-time, high-complexity product interfaces
  • Work closely with infra and model teams to shape how capabilities are surfaced in the UI
  • Design interaction patterns that reflect system constraints, not obscure them
  • Translate ambiguous user needs and design ideas into fast, expressive, production-grade UX
  • Prototype, test, and iterate quickly-across workflows, models, and tooling
  • Help define how Noumena's tools evolve with usage, training, and model development

You May Be a Good Fit If You:

  • Have deep experience with React, Next.js, TypeScript, and dynamic UI systems
  • Thrive in zero-to-one product environments where the interaction layer is the innovation
  • Have built developer tools, productivity systems, or exploratory UIs
  • Think in systems-not just views or states-and care about long-term maintainability
  • Can hold product, design, and implementation in your head at once-and move fast across them
  • Care deeply about speed, clarity, and interaction flow-not just styling polish

Strong Candidates May Also Have Experience With:

  • Working across the stack in TypeScript, Python, or Rust
  • Building editors, interactive tools, or structured/sandboxed interfaces
  • Real-time systems (token streaming, multi-threaded workflows, etc.)
  • Designing for data-heavy, technical, or domain-specific user groups
  • Modeling feedback loops between usage and system behavior

Why This Role Matters

You'll help define how usable intelligence actually feels: where model outputs become structured, navigable, and deeply intuitive product experiences. This is where AI stops being a demo-and becomes a system.


Team & Culture

We're a small, senior team that values autonomy, sharp thinking, and low-ego collaboration. We're remote-flexible but value time together, especially for product shaping and launches. We care deeply about craft and performance-and we hire people who want to build enduring systems that feel great to use.

Date Posted: 03 June 2025
Job Expired - Click here to search for similar jobs