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Senior Javascript Developer Jobs in Ontario (NOW HIRING)

Rivalry

Engineering and Product Seniority: Senior/Lead TL/DR: We are looking to add a highly skilled and ... Strong Knowledge of JavaScript (ES6+) / TypeScript * Strong understanding of inner workings of ...

Rivalry

Engineering and Product Seniority: Senior/Lead TL/DR: We are looking to add a highly skilled and ... Strong Knowledge of JavaScript (ES6+) / TypeScript * Strong understanding of inner workings of ...

ShyftLabs

Senior Backend Developer

Toronto, ON · Hybrid

CA$100K - CA$140K/yr

The Opportunity ShyftLabs is looking for a Senior Developer to help design, build, and scale our ... JavaScript, TypeScript, Node.js, and GraphQL remain core requirements for this role. What You'll Do

Morson Talent

25-192 - Senior Developer HR

Oshawa, ON · Hybrid

$80 - $95/hr

Title: Sr Developer HR 25-192 Resume Due Date: Thursday, March 12nd, 2026 (5:00PM EST) Number of ... Implement automated workflows using Flow Designer, Workflow, and scripting (JavaScript, Glide API)

Konrad

Senior Full Stack Developer

Toronto, ON · Hybrid

CA$120K - CA$145K/yr

About The Role As a Senior Full Stack Developer you'll be tasked with working on web application ... Very strong JavaScript programming skills, utilizing tools and platforms like TypeScript, Node.js, ...

StackandCo

... are looking for 2 senior developers of e\-commerce solutions for our client using Magento ... JavaScript, HTML5, CSS \/ Sass and market\-leading frameworks (React is a preference) \n * Strong ...

BinSentry

Senior Software Developer

Kitchener, ON · On-site

As we scale up, we are looking for a Senior Software Developer to help us build the software that ... Proficiency in JavaScript (we use React, Node.js) * Proficiency in AWS (DynamoDB, Lambda, SQS ...

StackandCo

You will be collaborating with a team of high performing Senior Frontend Developers on a daily ... JavaScript \/ TypeScript \n * HTML & CSS \n * Commercial Angular 2+ Commercial experience is ...

BinSentry

Senior Software Developer

Kitchener, ON

As we scale up, we are looking for a Senior Software Developer to help us build the software that ... Proficiency in JavaScript (we use React, Node.js) * Proficiency in AWS (DynamoDB, Lambda, SQS ...

StackandCo

... are looking for 2 senior developers of e\-commerce solutions for our client using Magento ... JavaScript, HTML5, CSS \/ Sass and market\-leading frameworks (React is a preference) \n * Strong ...

Smooth Commerce

Senior React Developer

Toronto, ON · On-site +1

CA$85K - CA$115K/yr

Senior React Developer Department: Software Technology Team Location: Toronto/Remote Type: Hybrid ... HTML, JavaScript, React, Redux, Next.js, Material UI, Gatsby.js, with 2+ years in TypeScript.

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Senior Javascript Developer information

What is a Senior Javascript Developer job?

A Senior JavaScript Developer is a highly experienced programmer specializing in JavaScript, including frameworks like React, Angular, or Node.js. They are responsible for designing, developing, and optimizing web applications, ensuring high performance and maintainability. Additionally, they provide technical leadership, mentor junior developers, and collaborate with cross-functional teams to deliver scalable solutions. Strong problem-solving skills, deep knowledge of JavaScript best practices, and experience with modern development tools are essential for this role.

What are typical challenges faced by Senior Javascript Developers in day-to-day work?

Senior Javascript Developers often encounter complex challenges such as optimizing web application performance, ensuring code scalability and maintainability, and integrating with diverse APIs and services. They are also expected to troubleshoot legacy code and address security vulnerabilities, all while keeping up with the rapidly evolving JavaScript ecosystem. Collaborating with designers, product managers, and junior developers can add layers of complexity to project requirements. However, overcoming these challenges is rewarding and provides opportunities to shape technical strategy and influence best practices within the team.

What are the key skills and qualifications needed to thrive in the Senior Javascript Developer position, and why are they important?

To thrive as a Senior Javascript Developer, a strong command of JavaScript (including ES6+), advanced front-end frameworks (like React, Angular, or Vue), and back-end technologies (such as Node.js) are essential, along with several years of professional coding experience. Familiarity with version control systems (like Git), CI/CD pipelines, and relevant certifications (e.g., AWS Certified Developer or JavaScript certifications) is highly valued. Excellent problem-solving abilities, mentorship skills, and effective communication help developers collaborate and lead within cross-functional teams. These skills enable Senior Javascript Developers to build robust applications, guide junior team members, and drive innovation in fast-paced tech environments.

What are the most commonly searched types of Javascript Developer jobs in Ontario? The most popular types of Javascript Developer jobs in Ontario are:
What are popular job titles related to Senior Javascript Developer jobs in Ontario? For Senior Javascript Developer jobs in Ontario, the most frequently searched job titles are:
What job categories do people searching Senior Javascript Developer jobs in Ontario look for? The top searched job categories for Senior Javascript Developer jobs in Ontario are:
What cities in Ontario are hiring for Senior Javascript Developer jobs? Cities in Ontario with the most Senior Javascript Developer job openings:
What are popular job titles related to Senior Javascript Developer jobs in ON? For Senior Javascript Developer jobs in ON, the most frequently searched job titles are:
Senior Javascript Developer jobs near you
Infographic showing various Senior Javascript Developer job openings in Ontario as of June 2026, with employment types broken down into 97% Full Time, 2% Part Time, and 1% Contract. Highlights an 87% Physical, 5% Hybrid, and 8% Remote job distribution.

Senior React Native Developer (Remote)

Rivalry

Toronto, ON • Remote

Full-time

PTO

Posted yesterday

Job description

Description
Reporting to: CTO
Working closely with: Engineering and Product
Seniority: Senior/Lead

TL/DR:
We are looking to add a highly skilled and experienced React Native developer to our team. You will help build and launch our new mobile app on Android and iOS platforms. You will work alongside both experienced and intermediate developers, and will be asked to collaborate with others as well as lead projects yourself. 

The nitty-gritty:
  • Leading by example, where you can report back to the CTO
  • Brainstorming sessions where you will contribute ideas to future features
  • Sprint Planning, where you will break down large epics into smaller actionable tasks with details
  • Code Reviews, providing feedback and direction to others
  • Pair Programming over Tuple, providing support to team members
  • Prototyping concepts as a part of idea exploration

Your stats:
  • 5+ years of engineering experience in the software industry as an developer/architect/engineer with a distinguished track record of delivering on technically demanding projects.
  • 3+ years of experience implementing React Native mobile applications
  • Experience in working with React Native with and without Expo
  • Strong Knowledge of JavaScript (ES6+) / TypeScript
  • Strong understanding of inner workings of JavaScript frameworks and building modern web applications
  • Experience with React Native best practices 
  • Experience adding and debugging 3rd party Native SDK and a plus if you have contributed to any
  • Experience with security best practices in mobile development 
  • Understanding of testing principles for mobile development 
  • Responsive design concepts, with a focus on mobile 

Bonus Points:
  • Experience with CI/CD for Mobile 
  • Google Play/Apple store knowledge
  • Native iOS/Android experience (Java, Kotlin, Swift, etc.) 
  • Vue or React JS (Our frontend web development team codes in vue only)
  • Knowledge of Nuxt.js/Next.js 
  • NodeJS and Server Side Rendering concepts
  • Creating functional user interfaces from theoretical discussion or wireframes
  • Frontend Asset Optimization (SVGs, image compression, minimal DOM depth)
  • Frontend Tooling (webpack, eslint, prettier, etc)
  • Testing your work (browser testing, unit tests, storybook, etc)
  • Any design experience 

Our Stats
  • We offer a competitive salary and total rewards package.
  • A chance to work in one of the most exciting and rapidly growing industries
  • Work with an extremely talented team who share a love for video games and esports on truly innovative projects.
  • See your performance in real time, be part of a supportive team with a focus on training, coaching and continual improvement, and benefit from yearly salary reviews
  • Remote and flexible working arrangements.
  • Open Paid Vacation. 
  • Free video games! Every Rivalry employee gets a monthly stipend.
  • + more!