Toronto, On Senior javascript full stack developer Jobs – 121 Openings This Week

Senior Full Stack Developer
CoLab Software —Toronto, ON
- Full-time
- Remote
- DevOps
- System design
- Databases
Quick apply
Senior Software Developer
SkillsWave Corporation —Toronto, ON
- Full-time
- Hybrid work
- Computer science
- Computer Science
- Engineering
Quick apply
RQ00580 - Sr. Full Stack Developer, Digital Experience Platform
Source Code —Toronto, ON
- Full-time
- Bilingual
- Azure
- DevOps
Quick apply
Sr Software Engineer - Core Backend & Platform Engineering
Basis —Toronto, ON
- $119,051–$160,000 a year
- Full-time
- Remote
- Java
- AWS
- JavaScript
Quick apply
Senior Salesforce Developer
Tata Consultancy Services —Toronto, ON
- Management
- Salesforce
- JavaScript
Senior Software Engineer | Remote | AI SaaS Software Role
Process Street —Toronto, ON
- Full-time
- Remote
- Java
- AWS
- JavaScript
- Dental care
- Paid time off
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Senior Ruby Developer - RBCx - Dr. Bill
Royal Bank of Canada —Toronto, ON
- Full-time
- DevOps
- Engineering
- Databases
Staff Back End Engineer (Applications)
Forma.ai —Toronto, ON
- Java
- Databases
- SQL
- Disability insurance
- Dental care
Senior Test Developer (Automation)
SkillsWave Corporation —Toronto, ON
- Full-time
- Hybrid work
- Computer Science
- Engineering
- AWS
Quick apply
Senior Lead Software Engineer – Regulatory Reporting & Big Data
Citi —Mississauga, ON
- $120,800–$170,800 a year
- Full-time
- Hybrid work
- Management
- Computer Science
- Engineering
22h
Principal Software Engineer - Platform, Identity and BI
Calabrio —Toronto, ON
- On call
- Remote
- DevOps
- Java
- SQL
- Designated paid holidays
- Disability insurance
Quick apply

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Senior Full Stack Developer (Java + Angular/React)
Tangentia —Toronto, ON
Experience developing with backend technologies such as Java, Spring Boot / Spring Webflux for building RESTful microservices.
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14d
.NET Full Stack Developer
Merrithew International Inc. —Scarborough, ON
Solid understanding of software engineering principles, design patterns, coding standards, and development best practices. Strong proficiency in C#, ASP.
$85,000–$95,000 a year
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Senior Full Stack Developer

CoLab Software
Toronto, ON

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Job details

Permanent | Full-time

Qualifications

React
DevOps
System architecture
System design
Databases
JavaScript
PostgreSQL
Distributed systems
APIs
DynamoDB
SaaS
AI
TypeScript
Python
Software architecture

Full job description

About CoLab

At CoLab, we help mechanical engineering teams bring life-changing products to market years sooner.

CoLab is the AI platform for driving stronger engineering decisions. Every design review in CoLab builds a knowledge repository of design feedback, decisions, and lessons learned - which AI agents draw from to flag issues on future designs before they compound. The more your team works in CoLab, the smarter it gets and the faster you arrive at the ideal design. Companies like Ford, Komatsu, and Johnson Controls use CoLab to catch issues earlier, eliminate rework cycles, and bring products to market faster.
Founded in St. John's, Newfoundland, CoLab has grown quickly from our first customer in 2019 to a rapidly scaling company. We've recently been recognized on Deloitte's Fast 50™ and Fast 500™, and named a Canadian company to watch by The Globe and Mail and Financial Post.

About the Role

We're looking for a Senior Full Stack Developer who naturally gravitates toward backend systems and infrastructure, but enjoys owning product experiences end-to-end.

At CoLab, full stack developers are deeply involved in shaping the product — not just implementing tickets. You'll work closely with Product, Design, AI, and fellow developers to solve complex technical problems that directly impact how engineering teams collaborate and make decisions.

Depending on the team you join, your work could involve building scalable APIs, improving system reliability, designing data-heavy workflows, integrating AI-powered capabilities, or developing intuitive frontend experiences for highly technical users.

This is a role for someone who likes difficult problems and meaningful ownership. The work is often ambiguous. Priorities evolve as we learn. You'll be expected to make thoughtful technical decisions, communicate clearly, and move work forward without waiting for perfect direction.

Some developers prefer staying narrowly specialized. That's not this role. We're looking for someone who enjoys understanding the full system — from infrastructure and services to the customer experience sitting on top of them.

Our Ideal Candidate

You're a strong backend engineer who's comfortable contributing across the stack when needed.

You care about building reliable systems, but you also understand that great software only matters if it solves real customer problems. You know how to balance speed, scalability, and maintainability without becoming dogmatic about any of them.

You likely won't enjoy this role if:

You prefer highly scoped work with minimal ambiguity
You only want to work in one layer of the stack
You optimize for technical perfection over iteration and learning

You'll thrive if:

You enjoy owning problems end-to-end
You're curious about both systems architecture and product experience
You communicate clearly and collaborate well across disciplines
You hold a high technical bar while staying pragmatic and low ego

Job Responsibilities

Design, build, and maintain scalable backend services, APIs, and data systems
Contribute to frontend application development using modern web technologies
Collaborate cross-functionally with Product, Design, AI, and Engineering teams to ship high-impact product improvements
Improve system reliability, observability, performance, and developer tooling
Help shape technical direction, architecture decisions, and engineering best practices
Investigate and resolve complex production issues across the stack
Prototype quickly, gather feedback, and iterate based on customer and business needs
Mentor developers through collaboration, code reviews, and technical discussions

Qualifications

7+ years of experience building production software applications
Strong backend development experience with modern languages such as Python and Javascript
Experience building and maintaining APIs, distributed systems, and cloud-based applications
Frontend experience with modern frameworks such as React and TypeScript
Database experience with Postgres and DynamoDB
Strong understanding of system design, scalability, and software architecture
Experience working with relational and/or distributed data systems
Ability to communicate technical concepts clearly across technical and non-technical audiences
Comfortable operating in fast-moving environments with evolving priorities

Bonus Points

Experience working on AI-powered products or workflows
Experience with event-driven systems and asynchronous architectures
Experience building products for technical users or enterprise SaaS platforms
Experience with infrastructure, DevOps, or platform engineering
Experience mentoring developers or leading technical initiatives

The Extra Details

This is a full-time, permanent position with competitive compensation and stock options
We offer extended health benefits, unlimited paid vacation, and RRSP matching
Our headquarters are in St. John's, Newfoundland, with flexible hybrid and remote options. This role can be performed remotely from anywhere in Canada.

Equity Note

Frequently cited statistics show that people who identify with historically marginalized groups are likely to apply to jobs only if they meet 100% of the qualifications. We encourage you to help us break that statistic and apply even if you don't meet every single qualification—your potential is what matters most to us.

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senior javascript full stack developer jobs in toronto, on

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