AI Code Tool Developer

Stealth AI Startup; San Jose (CA); Remote; USD 100,000 - 150,000; Full time

Job summary

A leading AI research lab seeks a developer to build Noumena Coder, an AI-native code assistant. This role involves designing core features and implementing workflows that enhance developer experiences, pushing the boundaries of software tooling.

Qualifications

• Experience building IDEs or developer tools.
• Deep understanding of developer workflows.

Responsibilities

• Design and build core features of Noumena Coder.
• Implement high-performance workflows for PR planning and debugging.
• Prototype interaction patterns for developers.

Skills

Developer Workflows

Frontend Development

Backend Development

Interaction Design

Tools

VS Code

Job description

Build the most thoughtful AI coding system on the planet—and change how software gets written.

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 compounds, and every product we ship makes the entire system smarter.

About the Role

We’re hiring a developer to help build Noumena Coder —our AI-native code assistant.

This isn’t just autocomplete. It’s a full rethink of what software tooling could look like when you own the models, the interface, and everything in between.

Because we’re not built on third-party APIs, we can push the interaction model much further—designing intelligent UX patterns, structured generation tools, and high-leverage workflows that would be impossible anywhere else.

You’ll work closely with our model, infra, and product teams to surface real intelligence—opinionated, adaptive, and deeply usable

What You’ll Own

• Design and build core features of Noumena Coder from the ground up
• Implement high-performance workflows around PR planning, refactoring, debugging, and more
• Prototype interaction patterns that align with real developer mental models
• Work across the stack (frontend-heavy) to shape how capabilities are exposed and experienced
• Collaborate with modeling and infra to experiment with tool use, routing, and planning
• Help define what “usable intelligence” means in the context of code

You May Be a Good Fit If You :

• Have built IDEs, developer tools, or programming environments
• Understand developer workflows deeply and want to make them feel magical
• Thrive at the intersection of product, engineering, and interaction design
• Can move quickly across frontend and backend to shape new patterns
• Have worked with LLMs or agents—or are excited to start

Strong Candidates May Also Have Experience With :

• VS Code extensions or other real-time editor tools
• Prompt orchestration, structured generation, or agent-based planning
• Syntax-aware tooling (ASTs, code-aware search, stepwise refactoring)
• Dev workflow plumbing : PR logic, CI triggers, branching patterns

Why This Role Matters

This is where human creativity meets machine reasoning.

If we get this right, we won’t just autocomplete code—we’ll change how people think, build, and reason about software.

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 during product shaping, feedback loops, and launches. We care deeply about craft and performance, and we hire people who want to build enduring systems that feel great to use.

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