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Contract Backend Developer Jobs in Toronto, ON (NOW HIRING)

Purolator

Technology Developer

Mississauga, ON

Description We are seeking a hands-on senior software engineer who can solve complex backend and ... Write and maintain automated unit, integration, contract, API and end-to-end tests while promoting ...

Purolator

Technology Developer

Mississauga, ON · On-site

Description We are seeking a hands-on senior software engineer who can solve complex backend and ... Write and maintain automated unit, integration, contract, API and end-to-end tests while promoting ...

Odaia Intelligence Inc.

Full-Stack Developer

Toronto, ON · On-site

Design and maintain reliable APIs and backend services that connect ODAIA's data, machine learning ... contracts. * Strong software engineering fundamentals, including modular design, clear interfaces ...

New

Geotab

Software Developer

Oakville, ON

Mid-morning you might drop into a backend slice: a Go service endpoint or a Python data pipeline ... API contract decision. Afternoons often involve a code review - either giving feedback to a ...

YO AI Labs

Software Engineer - Remote

Toronto, ON · Remote

Contract Location: Remote Job Summary: We are looking for experienced software engineers to help ... Work on challenging software engineering tasks across backend, full-stack, infrastructure, and ...

THOMSON REUTERS

Staff Software Engineer

Toronto, ON · Hybrid

This role is backend-leaning - you'll spend most of your time on server-side architecture, data ... Take ownership in developer experience by improving/automating CI/CD and other day to day ...

Collabera Canada Inc

Be Seen First

Senior Java Engineer (React)

Toronto, ON · On-site

CA$70 - CA$120/hr

Senior Java Engineer Type: 6-month contract + opportunity to extend Location: 1 Queen Street East ... Design, develop, and maintain backend services using Java and Spring Boot. * Contribute to ...

Solink

Senior Full-Stack Engineer (Media Team)

Toronto, ON · Remote

CA$115K - CA$173K/yr

This role is ideal for a senior backend or full-stack engineer who thinks in terms of throughput ... Design and evolve media platform APIs and contracts for multiple internal, as well as external ...

CorGTA

Senior Power Platform Developer

Toronto, ON · Hybrid

CA$100/hr

Fixed-Term Contract (12 Years) Compensation: Approximately $100/hr -- We have a great new ... Implement validation processes before data is pushed to backend systems * Support and enhance a ...

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All JobsContract Backend Developer JobsContract Backend Developer Jobs in Toronto, ON

Contract Backend Developer information

What are the key skills and qualifications needed to thrive as a contract backend developer, and why are they important?

To thrive as a Contract Backend Developer, you need strong programming skills in languages like Python, Java, or Node.js, along with experience in database management and API development, supported by a relevant degree or proven project experience. Familiarity with frameworks (such as Django, Spring, or Express), cloud services (like AWS or Azure), and version control systems (e.g., Git) is typically expected. Excellent problem-solving abilities, strong communication, and the ability to quickly adapt to new codebases and team environments set top contractors apart. These skills and qualities are crucial for delivering reliable, scalable backend solutions and integrating smoothly into diverse project teams.

What are some common challenges faced by contract backend developers when joining a new project?

Contract Backend Developers often encounter challenges such as quickly understanding existing codebases, adapting to different tech stacks, and aligning with the team's development practices. Since contract roles usually have tight deadlines, developers must rapidly familiarize themselves with project documentation and workflows. Effective communication with team members and proactive clarification of requirements are essential to ensure smooth integration and successful project outcomes.

What is a contract backend developer?

Contract backend developers are professionals hired on a temporary or project basis to build and maintain the server-side logic, databases, and APIs that power web or mobile applications. They work behind the scenes to ensure that applications function smoothly, handle data efficiently, and communicate effectively with front-end systems. Unlike full-time employees, contract backend developers typically work for a set duration or on specific projects, offering flexibility to both clients and developers. They often bring specialized expertise in programming languages such as Python, Java, Node.js, or Ruby, and may work remotely or on-site depending on the contract terms.
What are the most commonly searched types of Backend Developer jobs in Toronto, ON? The most popular types of Backend Developer jobs in Toronto, ON are:
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Contract Backend Developer jobs near you
Infographic showing various Contract Backend Developer job openings in Toronto, ON as of August 2026, with employment types broken down into 56% Full Time, and 44% Contract. Highlights an 100% In-person job distribution.

Full-Stack Engineer (Contract - Part-Time)

mello

Toronto, ON • On-site, Remote

$100K - $150K/yr

Contractor

Re-posted 14 days ago

Job description

About Us

mello is a Y Combinator (S21) backed start-up that integrates wellbeing into every employees' workflow in order to unlock their full potential. We are paving the path for the future of work. Our vision is to help every remote team on the planet to work healthier, more sustainably, and learn how to stay mello instead of burning out.

As second time founders, we burnt out building our last company during the pandemic. We wanted a simple, easy-to-use solution that integrates right into our workflow to increase our wellbeing but couldn't find anything on the market so we decided to build the solution we would've liked to use ourselves (aka, eating your own dog food).

At mello, we're building the new standard that remote and hybrid companies use to track, measure and act on burnout to inspire happier, healthier, more motivated teams. mello suggests smart actions for both employees, managers as well as HR to take to increase wellbeing, productivity and retention.

About this Role

As a modern Full-Stack Engineer, you are well versed in all aspects of development from a transistor to a website, including the browser, OS, CPU, RAM, architecture and everything. Here in mello we are much, mello-er, in requirements:

  • You will be responsible for both front end UI elements and experiences, as well as integrating, and maintaining / modifying backend services as required. The split is expected to be 63.5 / 37.5[1]
  • You will ensure the app can scale from 1000 to a million users
  • You will contribute and define our engineering values, process, and deployment cacadence, with scalability and security in mind.

Technical Skills you have:

  • IAM / OAuth (e.g. AWS Cognito, Okta)
  • Frontend frameworks i.e. React.js (Hooks preferred), Vue.js
  • In-depth CSS knowledge i.e. SCSS, Sass
  • 3rd party integrations experience with OAuth, SDK (i.e. AWS SDK), and API backend (BFF)
  • Develop, improve, and fix custom API backend as required
  • SPA Cloud deployment i.e. AWS S3 / Amplify, Netlify, Firebase a plus
  • Experience with Database ORB a plus

What you'll be doing

  • Experience with modern Front end frameworks e.g. React.js (Hooks), Vue.js and Gatsby. Familiarity with analytics is a plus.
  • Experience with OAuth flows and implementation / integration with 3rd party service
  • Experience with Front end deployment services e.g. AWS Amplify, Netlify, firebase
  • Experience with different data fetching / caching strategy and design tradeoffs, principles, and practices to help guide the team's technical direction
  • Experience with Test Driven Development and proficiency with a testing framework e.g. Jest
  • Experience with API integration as well as development. No stranger when comes to resolving CORS related nonsense
  • Experience with Database is a plus.
  • A strong desire to build secure software and protect user information.

Who you are

  • You are excited about our mission: unlocking human potential via wellbeing and the Future of Work
  • You are excited about joining a early-stage growth start-up
  • You have a growth-mindset
  • You don't mind learning a bit of everything outside engineering
  • You deeply care about UX/Design and won't compromise on quality
  • You ask "yes, and?" and are extremely collaborative
  • You're curious about how our UX Designers/Researchers conduct their work and how your work flows into theirs
  • You're proactive, a problem solver and go-getter
  • You're collaborative and are a team player
  • You're curious and self-motivated
  • You knows how to take and give direction
  • You can adapt to change quickly

Job Type: Contract (Part-Time)

Number of Hours: Up to 30hrs/week

Pay (USD): $100k - $150k

Education:

  • Bachelor's in Computer Science (Preferred)

Experience:

  • Full Stack Development: 2 years (Required)
  • DevOps: 1 years (Preferred)
Employment Type: CONTRACTOR

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