Full Stack Developer co-op

Flexspring, Inc.; Montreal (administrative region); Remote; CAD 22,000 - 33,000; Full time

Benefits offered by this job

Competitive co-op pay

Flexible hours (remote-first)

Remote work across Canada

Job summary

Flexspring is seeking a Full Stack Software Developer Co-op to join our R&D team in a remote-first setup across Canada. You’ll work on a real product from day one, shipping features that customers depend on, and many co-ops advance to full-time roles after graduation.

Expect to work primarily with a Java-based stack, writing backend and full-stack code, and collaborating across HR systems to ensure data moves smoothly. Strong interest in APIs and modern tooling is valued.

Qualifications

• You are currently studying Software Engineering, Computer Science, or a related field.
• Strong foundation in Java and JavaScript.
• Some exposure to Spring and JUnit (school projects count).
• You've completed minimum one co-op term or have relevant work experience.
• You've worked with or learned about APIs.

Responsibilities

• Build and improve features in Flexspring's product and understand the customer problem each one solves.
• Write backend and full-stack code in Java and JavaScript.
• Work with APIs and data flows between HR systems to ensure reliable data movement.
• Use modern tooling and AI to work efficiently, with careful review before shipping.
• Collaborate with experienced developers through code reviews and team discussions.

Skills

Java

JavaScript

APIs

Education

Currently pursuing a degree in Software Engineering or Computer Science

Tools

Spring

JUnit

REST APIs

React

GraphQL

Groovy

JMS

SOAP

Job description

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.

Remote (Canada)

• Full-time (40 hrs/week)
• Term: January 4 - April 22, 2027

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 reaches a customer
• Collaborating with experienced developers through code reviews and team discussions

What We're Looking For

• Strong analytical thinking. You like connecting the work in front of you to the reason it matters - the why, the outcome, the customer on the other end. Seeing the full picture is more satisfying to you than just closing a ticket.
• A thoughtful approach to new tools. You enjoy picking up unfamiliar technology, including AI tools, and using it to work faster and smarter. You also know that generating output is only the start - the real value is in reviewing it, catching what's off, and being able to stand behind the result.
• You've already completed minimum one co-op term or have some relevant professional work experience - this won't be your first time in a real work environment
• You're currently studying Software Engineering, Computer Science, or a related field
• A solid foundation in Java and JavaScript
• Some exposure to Spring and JUnit (school projects absolutely count)
• You've worked with or learned about APIs
• You're curious, motivated, and enjoy getting to the bottom of a problem

Nice to Haves

• Experience with REST APIs, React, GraphQL, Groovy, JMS, or SOAP
• Interest in integration platforms (iPaaS) and how systems connect
• Curiosity about how large systems talk to each other - and what happens when they don't

What You'll Walk Away With

• Real, hands-on experience shipping to a production platform that real customers rely on
• Mentorship from senior developers who'll invest in how you think, not just the code you write
• A working understanding of how HR data actually moves between enterprise systems
• Real practice using AI and modern dev tooling the way strong engineers do - fast, but with judgment
• Competitive co-op pay
• Flexible hours in a remote-first environment
• A strong chance to grow into a full-time role after graduation