Full Stack Software Engineer - Canada

ABOUT REACHER Reacher is a YC backed AI SaaS platform building the operating system for TikTok Shop brands and creators. We’re backed by Y Combinator, Pioneer Fund, Rebel Fund, and operators including Steve Huffman (CEO of Reddit), Matteo Franceschetti (CEO of Eight Sleep), Theo Browne (t3.gg http://t3.gg), Kulveer Taggar (Zeus Living), and Jake Mintz (Bump). We have years of runway and are scaling fast with some of the biggest brands in the world (UnderArmour, Hanes, Logitech, Goli) Our vision is to become the Hubspot for creator marketing, powering brands and creators to connect and grow across all commerce platforms (Youtube Shopping, Instagram Shopping, Shopify, Amazon). We're building key infrastructure for the creator economy and implementing AI with the world's largest brands and creators. Your work will directly impact users on day 1 - our user base depends on our product daily. We build with AI, not around it. Our engineering team uses Claude Code and agentic coding tools as our primary development environment. If you're spending your days directing AI agents to ship code while you focus on architecture, review, and system design — and you can't imagine working any other way — keep reading. WHAT YOU'LL DO - Own and lead product features end-to-end: research, design, implement, test, and ship - Lead and shape engineering architecture - set standards for code quality, testing, and development practices across the stack - Mentor and guide other engineers in adopting AI-native workflows, establishing best practices and patterns - Talk directly to customers and translate vague requirements into polished user experiences - Design scalable backend systems (Python, FastAPI, PostgreSQL, GCP) - Build responsive, delightful UIs (React, TypeScript, Tailwind, shadcn/ui) - Write clean, maintainable, and testable code with minimal oversight - Drive architectural decisions and engineering processes that maximize AI-assisted development velocity - Ship fast and learn fast -