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Engineer — Product & User Interface Systems
San Francisco, US on-site full time senior Feb 13, 2026
About this role
We're building the control plane for AI agents in teams and companies.
As a Founding Engineer focused on Product & User Interface Systems, you will design and build the user-facing layer of that control plane — the web applications, workflows, and interfaces that make powerful agent infrastructure usable by real teams.
This is not a “frontend-only” role. You will work across the stack: distributed cloud-based systems, Kubernetes-based services, and modern web applications. You’ll collaborate deeply with product and design to turn complex infrastructure into intuitive, high-leverage user experiences.
You’ll also help define a new interface paradigm: agents as an interactive modality — not just chat, but structured, controllable, and production-grade workflows.
If you care about product quality, system coherence, and shaping how humans interact with autonomous systems — we want to talk.
WHAT YOU’LL OWN
You will build and evolve the user-facing layer of our platform:
WEB APPLICATION & PRODUCT EXPERIENCE
- Design and implement React + TypeScript web applications
- Build high-performance, stateful interfaces for managing agents
- Develop dashboards, policy configuration UIs, audit views, and workflow builders
- Create systems that make complex agent behavior understandable and controllable
FULL-STACK ENGINEERING
- Build backend services supporting the UI
- Design APIs for agent control, policy configuration, and observability
- Work within a Kubernetes-native, cloud-based distributed system
- Collaborate on schema design, data modeling, and service boundaries
AGENT-NATIVE INTERFACES
- Explore agents as a new user interface modality
- Design structured, interactive agent workflows beyond simple chat
- Combine UI controls with agent reasoning
- Experiment with hybrid patterns: visual + conversational + automated systems
CLI & FUTURE INTERFACES
- Contribute to a TypeScript- or Python-based CLI
- Design consistent interaction patterns across web and CLI
- Lay groundwork for potential future mobile interfaces
PRODUCT & DESIGN COLLABORATION
- Work closely with product and design to translate concepts into shipped software
- Participate in usability thinking and iterative refinement
- Ship quickly, iterate based on feedback, and improve continuously
WHAT WE’RE LOOKING FOR
- Experience building production-grade web applications in React + TypeScript
- Comfort working across the full-stack of distributed systems
- Strong API design instincts
- Experience shipping SaaS products used by technical teams
- Ability to translate complex backend systems into usable interfaces
- Strong product intuition and UX sensibility
BONUS
- Experience building developer tools or control-plane software
- Experience designing workflow builders or configuration-heavy interfaces
- Experience with real-time systems or streaming UIs
- Experience building CLIs
- Familiarity with LLM-powered products or agent systems
WHAT MAKES THIS ROLE UNIQUE
- You’ll help define how teams interact with autonomous agents.
- You’ll build interfaces for infrastructure-level systems.
- You’ll operate at the intersection of product design, distributed systems, and AI.
- You’ll have ownership from concept to production.
This is a high-impact, high-autonomy role. You’ll influence product direction and user experience at the foundational stage of the company.
WHO THRIVES HERE
- Engineers who care about product polish and system clarity.
- Builders who like working across frontend and backend.
- People comfortable turning complexity into usable abstractions.
- Those excited about inventing new human–AI interaction models.