Senior Product Engineer

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Own end-to-end product features in Horizon — from user problem to wireframe to shipped, polished UI. You define what "done" looks like.
Design and build user-facing experiences that are thoughtful, fast, and intuitive. You have taste and opinions about how developer tools should feel.
Partner with product and customers to translate field signal and user feedback into working software at pace.
Write maintainable and performant full-stack code — your strength is on the front-end and in UI/UX, and you're capable across the stack when the feature demands it.
Develop product knowledge of the AI/LLM tooling space, MCP ecosystem, and how Horizon fits into emerging patterns.
Participate in on-call/incident response and help maintain production reliability standards.

5+ years of full-stack engineering experience, with demonstrated success shipping user-facing products.
Strong front-end and design skills with deep proficiency in TypeScript, React, and modern UI libraries like Tanstack. You can go from wireframe to polished implementation. You have opinions about good UI/UX and the craft to back them up.
Comfortable across the full stack, but your strength and energy is in the product surface, especially the things users see and interact with.
Experience building with or genuine interest in the Model Context Protocol (MCP) and AI/LLM tooling. You follow the landscape closely and have formed opinions.
Track record of shipping in high-ambiguity, early-stage environments. You're comfortable with incomplete information and fast iteration.
Equally comfortable shipping a rough prototype to test an idea and hardening production code that users depend on. You know when to move fast and scrappy to validate direction and when to slow down and build for durability.
Self-directed with strong judgment: you identify problems, propose solutions, and ship — keeping the team aligned through clear communication.
Comfortable with AI-powered development tools (Cursor, Claude Code, GitHub Copilot, etc.) as force multipliers for your work.
Python experience is a bonus.

Remote-first team with flexible-first culture
Equity Stock Options
401(k) with 5% company match (vests immediately!)
Unlimited PTO
Medical, Dental and Vision insurance
Generous Parental Leave
Life Insurance and Disability benefits
$800 remote work stipend for whatever you need to work (food, wellness, equipment etc.)
Great builders deserve great tools—we provide access to Claude Code, Codex, and other leading AI tools so you can ship faster and focus on hard problems.

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