📍Location: Toronto, ON (Hybrid – 3 days/week in-office, Yorkville area) | Company: SELLIT9

💰 Salary: CAD 110,000 - 140,000 (potential adjustment post-funding)

📈 Equity: 0.4% - 0.6%

Who Are We? 🤔

SELLIT9 is a venture-backed trade-in infrastructure company that powers instant trade-ins across any e-commerce solution. We enable merchants to offer real-time device trade-ins, turning used item into immediate value without adding operational complexity. We handle pricing, logistics, and fulfillment behind the scenes so trade-ins just work.

For customers, that means flexibility: they can apply their trade-in value toward a new purchase or choose a cash payout. We’re currently operating in Canada and actively expanding our platform, with plans to launch in the United States in early 2026. We’re building the foundational layer that makes trade-ins simple, fast, and scalable—anywhere commerce happens.

About the Role: Founding Engineer

As our Founding Engineer, you’ll work hands-on across the entire stack while also playing a strategic role in shaping our product and technical foundation. You’ll be one of the first engineering hires, working directly with the CTO (Oz Alvarez) and CEO (Josh Guttman) to architect and scale a fintech platform from scratch.

If you thrive in early-stage startups, love solving complex engineering challenges, and want to shape the future of fintech, this is the opportunity for you.

Who We Look For 🤘

• Problem solvers who are resourceful and quick to find solutions
• Builders at heart — you create products, not just deliver services
• You thrive in fast-paced environments and adapt quickly to change
• You prefer moving fast, shipping improvements, and experimenting—not navigating slow, corporate bureaucracy
• You bring a positive attitude and enjoy maintaining a fun, collaborative work environment
• You have a growth mindset and actively seek learning and ownership opportunities

Tech Stack 💻

Here’s a snapshot of what you’ll work with—we value pragmatism and are always open to better tools and ideas:

• Backend: Node.js, NestJS, serverless architecture (Google Cloud Functions, Cloud Run)
• Frontend: Next.js, React, Strapi (Headless CMS)
• Testing: Jest, Playwright (unit & integration testing)
• Cloud Infrastructure: Google Cloud Platform (GCP) — Firebase, Cloud Run, Cloud Functions, Workflows, GKE, Redis, API Gateway, Pub/Sub, BigQuery, Load Balancers, Cloud CDN
• Database: PostgreSQL
• Internal Tools: Retool
• CI/CD: Cloud Build, GitHub Actions
• Monitoring & Logging: Sentry, Cloud Logging, GCP Alerts
• Analytics & Insights: Google Analytics, Mixpanel, Hotjar, Looker

What You'll Do 👀

• Build new features and maintain existing products.
  • Work with Product & Design teams to align solutions with business needs.
  • Mentor engineers, conduct code reviews, and promote best practices.
  • Drive scalability, performance, and maintainability.
  • Contribute to project estimation, planning, and execution.
  • Collaborate with external service providers for smooth operations.
  • Write high-quality, tested, and performant code.
  • Use data-driven insights to improve development.

Apply if you ✅

• Have 5+ years of full-stack development experience in fast-growing startups or tech companies.
• Excel at developing, releasing, and maintaining applications in an agile, fast-paced environment.
• Are comfortable working across frontend and backend development.
• Have experience with our tech stack or can learn and adapt quickly.
• Possess a strong understanding of database structures, clean code, and best practices.