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Freelance Full Stack Web Developer Jobs in Montreal, QC

Flexspring

Full Stack Developer co-op

Montreal, QC · Remote

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 ...

BEEM

Developpeur(se) Logiciel Senior(e)

Montreal, QC · On-site

Developper des applications web Full-Stack avec Javascript (NodeJS), Typescript et React * Rediger ... As a Senior Software Developer at BEEM, you'll be at the heart of designing, developing and ...

US Mobile

Full-Stack Software Engineer

Montreal, QC · On-site +1

CA$120K - CA$150K/yr

We're looking for a full-stack JS engineer to help us scale and connect millions of devices to wireless networks. The projects and potential impact are incredible. We're looking for talented ...

Mantu

Senior Full stack.Net Developer

Montreal, QC · On-site

We are seeking a hands-on Senior Full Stack .NET Developer to join an enterprise technology team responsible for building, integrating, and supporting business-critical applications and collaboration ...

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Freelance Full Stack Web Developer information

What is a freelance full stack web developer?

A Freelance Full Stack Web Developer is a self-employed professional who designs and builds both the front-end (user interface) and back-end (server-side logic, databases) of websites and web applications. They work on a contract or project basis for various clients rather than being tied to a single employer. Full stack developers are skilled in multiple programming languages and frameworks, enabling them to handle all aspects of web development. Their versatility allows clients to hire one person for end-to-end web solutions.

What are the key skills and qualifications needed to thrive as a freelance full stack web developer?

To thrive as a Freelance Full Stack Web Developer, you need strong proficiency in both front-end (e.g., HTML, CSS, JavaScript) and back-end (e.g., Node.js, Python, databases) development, often supported by a relevant degree or portfolio of work. Familiarity with frameworks like React or Angular, version control systems like Git, and cloud platforms such as AWS or Heroku is typically required. Excellent communication, time management, and problem-solving skills help you stand out when working independently with clients. These skills and qualities are crucial for delivering high-quality projects, managing client relationships, and adapting to varied technical requirements.

What are some common challenges freelance full stack web developers face when managing multiple client projects simultaneously?

Freelance full stack web developers often juggle several projects at once, which can make time management and prioritization essential challenges. Balancing deadlines, responding promptly to client communications, and ensuring consistent code quality across different tech stacks require strong organizational skills. Additionally, freelancers must proactively set clear expectations with clients about project scope and turnaround times to avoid scope creep and burnout. Using project management tools and maintaining open communication are key strategies for managing these challenges effectively.

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Freelance Full Stack Web Developer jobs near you
Infographic showing various Freelance Full Stack Web Developer job openings in Montreal, QC as of August 2026, with employment types broken down into 1% Internship, 83% Full Time, 10% Part Time, 1% Temporary, and 5% Contract. Highlights an 82% Physical, 5% Hybrid, and 13% Remote job distribution.

Full Stack Developer co-op

Flexspring

Montreal, QC • Remote

Other

Re-posted yesterday

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.


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