SeniorSoftwareEngineer

SENIOR FULL STACK SOFTWARE ENGINEER Location: Onsite in Toronto, ON   About SalesJack SalesJack is a fast-growing, profitable sales software platform (CRM, Prospecting Service) purpose-built for independent businesses in the construction supply industry. Our team and customers are spread across the US and Canada. Our mission: build tools that solve real problems for our customers and transform industry workflows.   Your Role As a Senior Full Stack Software Engineer at SalesJack, you'll be one of the senior technical hires on the team - owning major product surfaces end-to-end. That means more than writing code: you'll talk to customers, scope what to build, make the product calls, and ship it. We don't have a PM layer between engineering and customers; the engineers closest to the problem own the solution. You'll partner directly with the founders and lead engineers to set architectural direction and raise the engineering bar while also bringing real product taste to the work. This is a hands-on role: writing production code daily, making the calls on what gets built and how it scales, and sweating the details of how it feels to use. We highly value a startup mentality. Strong opinions held loosely, fast iteration, and a bias toward shipping over deliberating.   What You'll Do: - Own entire product features from "this is a problem worth solving" to "this is live in customers' hands" — scoping, designing, building, shipping, iterating - Talk to customers directly: discovery calls, support tickets, ride-alongs with sales reps in lumberyards. Use what you learn to make better product decisions - Make the architectural calls on new systems — data model, API surface, frontend composition — and document the reasoning so the team can build on it - Build across our Node.js stack: Next.js on the frontend, Node services on the backend, BullMQ for background jobs and workflows, PostgreSQL as the system of record - Design and operate authentication, authorization, and multi-ten