Mississauga, On Senior javascript full stack developer Jobs – 115 Openings This Week

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 Ruby Developer - RBCx - Dr. Bill
Royal Bank of Canada —Toronto, ON
- Full-time
- DevOps
- Engineering
- Databases
Senior Application Developer- Python (Global Security)
Royal Bank of Canada —Toronto, ON
- Full-time
- Azure
- DevOps
- System design
RQ00580 - Sr. Full Stack Developer, Digital Experience Platform
Source Code —Toronto, ON
- Full-time
- Bilingual
- Azure
- DevOps
Quick apply
Senior Salesforce Developer
Tata Consultancy Services —Toronto, ON
- Management
- Salesforce
- JavaScript
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 Software Engineer | Remote | AI SaaS Software Role
Process Street —Toronto, ON
- Full-time
- Remote
- Java
- AWS
- JavaScript
- Dental care
- Paid time off
Quick apply
Senior Manager, AEM Development
Royal Bank of Canada —Toronto, ON
- Full-time
- Azure
- DevOps
- Java
4d
Principal Software Engineer - Platform, Identity and BI
Calabrio —Toronto, ON
- On call
- Remote
- DevOps
- Java
- SQL
- Designated paid holidays
- Disability insurance
Quick apply
Application Security Consultant - SCA - Global Security
Royal Bank of Canada —Toronto, ON
- Full-time
- Hybrid work
- Azure
- Management
- DevOps
11d
Senior Full-Stack Developer
Priceline.com —Toronto, ON
- $140,000–$160,000 a year
- Full-time
- Hybrid work
- Computer Science
- Java
- Databases
- Disability insurance
- Dental care
4h
Senior Full Stack Developer
Thrive Career Wellness Inc —Toronto, ON
- $100,000–$120,000 a year
- Azure
- AWS
- JavaScript
2h

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Senior Full Stack Engineer (Platform & Integrations)
XYZ Storage —Toronto, ON
Strong backend development experience with Python, PHP, or JavaScript, Node. Strong experience with modern development workflows including version control and…
$120,000–$150,000 a year
Quick apply
Senior Software Engineer (Full-Stack JavaScript)
Morningstar —Toronto, ON
3+ years of professional software development experience, preferably with a focus on full-stack JavaScript or TypeScript.
$90,489–$132,711 a year

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Sr. Software Developer
TRITON Canada Inc. —Toronto, ON
Leverage AI-assisted development tools responsibly and effectively to improve development efficiency while maintaining high engineering standards.
$100,000–$125,000 a year
Quick apply
5d
Full Stack Angular Developer
Jeavensoft —Toronto, ON
Lead in the architecture, design, specification, development and implementation of SaaS solutions that can be deployed in the private public cloud environment.

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senior javascript full stack developer jobs near mississauga, on

Sr Software Engineer - Core Backend & Platform Engineering

Basis -
Toronto, ON

Quick apply

Job details

Full-time
$119,051–$160,000 a year

Qualifications

Kubernetes
Java
AWS
Docker
Ruby on Rails
Cloud development
JavaScript
PostgreSQL
Terraform
Redis
RabbitMQ
Ruby
Kafka
Python

Full job description

WHO WE ARE

At Basis, we empower agencies and brands with cutting-edge software that automates digital media operations. Our all-in-one platform supports seamless planning, reporting, and financial reconciliation across direct, programmatic, search, and social media.

We’re not just building advanced technology; we’re also building a culture where passionate, motivated individuals come together to drive meaningful change. Our commitment to inclusivity and growth ensures our employees thrive both professionally and personally.

With our headquarters in Chicago, we offer flexible work options across the U.S. and Canada, including remote, hybrid, or on-site at headquarters.

ABOUT THE TEAM

Technology is at the core of what we do. Basis is an industry-leading platform that automates and simplifies the entire digital ad campaign process. It processes over 300 billion events per day and uses AI and machine learning across the full campaign lifecycle.

The Core Backend team is the connective tissue that keeps Basis running and enables other engineering teams to move faster. We own the core backend, the foundational customer-facing features developed within it, and the systems and standards that feature teams build on top of. We also define expectations for performance and reliability, observability foundations, and release tooling, along with the strategy for decomposing the system into well-defined microservices and evolving the application over time.

If you're energized by platform-level problems, by setting the standards other teams build on, and by work whose outcome is other teams shipping faster, this is the team for you.

WAYS YOU’LL CONTRIBUTE

Contribute to the platform's performance, observability, and reliability standards, and help drive adoption across feature teams.

Reshaping how we build and ship: CI/CD, trunk-based development, and developing a layered testing strategy (unit, integration, contract, end-to-end) so teams can test in isolation and deploy independently.

Collaborate closely with the Enterprise Developer Experience team to build shared tooling.

Improve the developer and pre-production experience for the core backend — pipeline design, environment stability, and a fast development feedback loop.

Lead platform projects across the stack — release tooling, platform reliability, and the patterns that guide how we decompose the core backend into services.

Take ownership of deliverables, quality, and on-call support across our systems and components, and drive projects from ideation through production.

Actively partner with the feature teams who depend on the systems you own — through pull requests, demos, design discussions, and identifying risks and blockers early.

WHAT YOU BRING TO THE TABLE

5+ years of professional software engineering experience.

Experience developing large-scale cloud-native systems — reliability, scalability, and the observability that keeps them healthy.

Depth in modern software delivery: CI/CD, trunk-based development, layered automated testing, and release practices like feature flagging, canary deployments, and progressive delivery.

Experience contributing to org-wide standards — testing strategy, environment management, performance and SLOs.

Fluency with AI coding tools (Claude Code, Cursor, Codex, etc.) as a core part of your development workflow — for code generation, debugging, exploring unfamiliar codebases, and documentation — paired with strong judgment for evaluating, refining, and taking full ownership of AI-generated output.

A thoughtful, collaborative approach to design and decision-making, and a commitment to inclusive environments where all voices are valued.

OUR TECH STACK

Ruby, Rails, JavaScript, React, Java, Python

PostgreSQL, Redis, Kafka, RabbitMQ, Sidekiq

AWS, EC2, RDS, Docker, Terraform, Kubernetes

Datadog, Airbrake

This salary range reflects a typical compensation range for the role and level in most U.S. locations. Final compensation offered will depend on your location, experience, and skills. Total compensation may also include bonuses, equity, and competitive benefits.

Integrity in Hiring

At Basis, integrity is at the core of how we hire. To protect our candidates and our company, we verify identity, education, and employment history for all hires. Some roles may also require onsite or in-person interviews as part of the process. Any misrepresentation of identity, experience, or skills may result in removal from the hiring process or termination of employment. We value transparency and authenticity and expect the same from every applicant.

Anything Else?

Don’t have every skill listed? No problem! We know experience can be built in many ways. If you have relevant skills that aren't reflected in your resume, we encourage you to share them in an optional cover letter.

Life With Basis

We’re committed to our people’s growth and well-being because our success is tied to theirs. That’s why we’ve earned recognition as a top workplace, including: Ad Age, #1 Best Places to Work, WorkLife's #1 Most Committed to Work Life Balance, and the Chicago Tribune's Top Workplaces in Chicago. We offer competitive perks, including a flexible work week, 401k/RRSP matching, mental health support, paid sabbaticals, generous parental leave, flexible work options, and more.

Basis is proud to be an equal-opportunity employer. We celebrate all team members regardless of gender identity, sexual orientation, race or cultural background, religion, disability, age, and beyond.

If you need assistance with interview accessibility, please contact [email protected]. Your privacy is important to us, view our policy here.

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.

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Refine Your Search

senior javascript full stack developer jobs in mississauga, on

Sr Software Engineer - Core Backend & Platform Engineering

Senior Ruby Developer - RBCx - Dr. Bill

Senior Application Developer- Python (Global Security)

RQ00580 - Sr. Full Stack Developer, Digital Experience Platform

Senior Salesforce Developer

Staff Back End Engineer (Applications)

Senior Test Developer (Automation)

Senior Software Engineer | Remote | AI SaaS Software Role

Senior Manager, AEM Development

Principal Software Engineer - Platform, Identity and BI

Application Security Consultant - SCA - Global Security

Senior Full-Stack Developer

Senior Full Stack Developer

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WAYS YOU’LL CONTRIBUTE

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