Full Stack Developer co-op

About Flexspring

Everything connects. That's not just our tagline - it's the whole job. Flexspring is an iPaaS (Integration Platform as a Service) built for one of the thornier problems in enterprise software: getting HR systems to actually talk to each other. We link payroll, recruiting, benefits, and HRIS platforms API-to-API so data moves between them cleanly and in near real-time, with no manual re-entry anywhere. The results back it up - 3,000+ integrations delivered, 800+ clients including Fortune 500 companies, ADP Marketplace Platinum Partner, and named HR Data Integration Experts of the Year 2025. And we do it all as a remote-first team spread across Canada and beyond.

The Opportunity

We're looking for a Full Stack Software Developer Co-op to join our R&D team - and we'll be upfront about what that means. This is real experience, in the fullest sense. No throwaway side project, no busywork to fill the term - from your first weeks you'll work on our actual product, as a real part of the team, shipping features that real customers depend on. Many of our co-ops go on to join us full-time after graduation. You'll work mainly in a Java-based stack, and you'll quickly find that integration work is half code, half business reasoning - every feature exists because a real company needs its HR data to move without breaking. If you like building things that ship, and you tend to ask "what is this really for?" before writing a line of code, we'd love to hear from you.

What You'll Be Working On

Building and improving features in Flexspring's product - and understanding the customer problem each one solves Writing backend and full stack code in Java and JavaScript Working with APIs and the data flowing between HR systems, where getting the small details right is the whole job Using modern tooling, AI included, to work efficiently - and reviewing what it produces with a careful eye before it ships Writing and running tests so you know your work holds up before it