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Javascript developer Jobs in Markham, ON

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Javascript developer • markham on

Last updated: 1 day ago
Remote JavaScript Engineer - AI Trainer

Remote JavaScript Engineer - AI Trainer

SuperAnnotateMarkham, Ontario, CA
Remote
Full-time
As an hourly paid, fully remote JavaScript Engineer for AI Data Training, you will review complex AI-generated code and explanations or generate new ones, evaluate the reasoning quality and step-by...Show moreLast updated: 15 days ago
Senior Software Developer (Java)

Senior Software Developer (Java)

OpenTextRichmond Hill, York Region, CA
Full-time
Senior Software Developer (Java).OpenText is a global leader in information management, where innovation, creativity, and collaboration are the key components of our corporate culture.As a member o...Show moreLast updated: 30+ days ago
Senior Python Developer

Senior Python Developer

Yep AdsMarkham, York Region, CA
Full-time
We are a technology company building cutting edge enterprise software to “change the game” in online advertising.The company is headquartered in downtown San Francisco (SOMA) with offices at Toront...Show moreLast updated: 30+ days ago
Lead Front End Developer (React)

Lead Front End Developer (React)

Onico SolutionsRichmond Hill, Ontario, CA
Remote
Permanent
Lead Front End Developer (React).Our client, an NFT investor platform is looking for a Lead Front End Developer (React) for a long term engagement to help build sophisticated tools for a video game...Show moreLast updated: 30+ days ago
Systems Analyst / Developer (Oracle)

Systems Analyst / Developer (Oracle)

BGISMarkham, York Region, CA
Full-time
Systems Analyst / Developer (Oracle).Be among the first 25 applicants.BGIS is a leading provider of customized facility management and real estate services. With a global team of over 6,500, we focu...Show moreLast updated: 30+ days ago
Integration Developer

Integration Developer

Saint ElizabethMarkham, York Region, CA
Full-time
The integration developer role requires solid experience collaborating within a team to deliver production-grade enterprise integrations. This position is centered around connecting systems, automat...Show moreLast updated: 30+ days ago
QA Automation Engineer - TestComplete, Selenium, JavaScript

QA Automation Engineer - TestComplete, Selenium, JavaScript

Astra North Infoteck Inc.Markham Central, ON, ca
Full-time
Help with and implement our QA Architectural Artifacts.All testing systems, their feedback loops and mechanisms, logging, reporting and interconnectivity. Process artifacts that detail how, where an...Show moreLast updated: 23 days ago
Jr or Intermediate ASP web developer

Jr or Intermediate ASP web developer

ROSSRichmond Hill, York Region, CA
Full-time
Our client, an award winning web development company is looking to add a Junior – Intermediate ASP web developer to their team. This individual will be responsible for working on a range of projects...Show moreLast updated: 30+ days ago
Full Stack Developer (Req ID 2025-17)

Full Stack Developer (Req ID 2025-17)

SS8 NetworksMarkham, Ontario, Canada
Full-time
Position : Full Stack Developer.About SS8 Networks : As a leader in Lawful and Location Intelligence.Our commitment is to extract analyze and visualize the critical intelligence that gives law enforc...Show moreLast updated: 30+ days ago
BI Developer

BI Developer

Pet ValuMarkham, York Region, CA
Full-time
BI Developer page is loaded## BI Developerremote type : Hybridlocations : 0001 – Markham Officetime type : Full timeposted on : Posted Todayjob requisition id : R24394Hybrid : Markham, Ontario •...Show moreLast updated: 30+ days ago
Mobile Developer

Mobile Developer

CB CanadaMarkham, Ontario, Canada
Full-time +1
Robert Half Technology is looking to hire a full time Mobile Developer for a client that is rapidly expanding in the East GTA Region within the Software Industry. Please take a look at the summarize...Show moreLast updated: 30+ days ago
  • Promoted
FRONT-END DEVELOPER

FRONT-END DEVELOPER

Finlink GroupRichmond Hill, ON, Canada
Full-time
Bring ideas to life with code that feels as smooth as it looks.We’re searching for a talented Front-End Developer who’s passionate about building sleek, scalable, and intuitive web appl...Show moreLast updated: 30+ days ago
Senior / Team Lead Full Stack (Node.js / React) developer (Toronto, hybrid)

Senior / Team Lead Full Stack (Node.js / React) developer (Toronto, hybrid)

TechMagicToronto, hybrid, Ontario, Canada
Full-time
We are looking for a skilled Senior / Team Lead Full Stack (Node.React) developer with 5+ years of professional experience to join our project for working on enterprise-level project from the Canada....Show moreLast updated: 1 day ago
Salesforce Developer

Salesforce Developer

Staples CanadaRichmond Hill, York Region, CA
Full-time
Get AI-powered advice on this job and more exclusive features.The Salesforce Developer is a vital member of the CRM team responsible for developing and supporting solutions within the Salesforce.An...Show moreLast updated: 3 days ago
Android Developer

Android Developer

LancesoftScarborough, ON, CA
Full-time
Quick Apply
Location Address : 2201 Eglinton Ave E Ecosystem 5.Work arrangement : (Hybrid) 2 days in office –Wed and Fridays.Contract Duration : 3- 6 months will be renewed on a monthly basis due to changes...Show moreLast updated: 2 days ago
Senior Software Developer Front End

Senior Software Developer Front End

Randstad CanadaNorth York, Ontario, CA
Temporary
Quick Apply
Do you have experience in React, REST APIs, JavaScript and TypeScript, Node.NextJS? Do you have knowledge in Web Content Accessibility Guidelines (WCAG) for web application development? If so, this...Show moreLast updated: 30+ days ago
  • Promoted
Lead developer

Lead developer

Plan IT SearchMarkham, ON, Canada
Full-time
Ability to build and support strong internal relationships with crossfunctional departments.Excellent communication skills, both written and verbal. Strong PC skills are required (MS Office, SAP) an...Show moreLast updated: 30+ days ago
Frontend Developer

Frontend Developer

MekariMarkham, York Region, CA
Full-time
We are looking for an experienced Freelance Front-End Engineer to join our dynamic team.In this role, you will be responsible for building and maintaining the client-facing part of our web applicat...Show moreLast updated: 30+ days ago
JPC -1461 - Senior Web Developer

JPC -1461 - Senior Web Developer

ITS GlobalOntario
Full-time
Our client is looking for a Senior Web Developer to join their team.Developing new user-facing features using React.Building reusable components and front-end libraries for future use.Translating d...Show moreLast updated: 30+ days ago
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Remote JavaScript Engineer - AI Trainer

Remote JavaScript Engineer - AI Trainer

SuperAnnotateMarkham, Ontario, CA
15 days ago
Job type
  • Full-time
  • Remote
Job description

As an hourly paid, fully remote JavaScript Engineer for AI Data Training, you will review complex AI-generated code and explanations or generate new ones, evaluate the reasoning quality and step-by-step problem-solving, and provide expert feedback that helps models produce answers that are accurate, logical, and clearly explained. You will assess solutions for accuracy, clarity, and adherence to the prompt, identify errors in methodology or conceptual understanding, fact-check information, write high-quality explanations and model solutions that demonstrate correct methods, and rate and compare multiple AI responses based on correctness and reasoning quality.

This role is with SME Careers, a fast-growing AI Data Services company and subsidiary of SuperAnnotate that provides AI training data for many of the world’s largest AI companies and foundation model labs. Your work will directly help improve the world’s premier AI models while giving you the flexibility of impactful, detail-oriented remote contract work.

Key Responsibilities :

  • Develop AI Training Content : Create detailed prompts in various topics and responses to guide AI learning, ensuring the models reflect a comprehensive understanding of diverse subjects.
  • Optimize AI Performance : Evaluate and rank AI responses to enhance the model's accuracy, fluency, and contextual relevance.
  • Ensure Model Integrity : Test AI models for potential inaccuracies or biases, validating their reliability across use cases.

Your Profile :

  • Minimum 2+ years of professional JavaScript experience in production environments.
  • Strong understanding of closures, async / await, prototype-based inheritance, and JavaScript event loop behavior, with deep proficiency in modern Vanilla JavaScript (ES6 / ES2015+).
  • Proven ability to evaluate correctness, readability, and performance of JavaScript code, including identifying subtle logic and edge-case issues.
  • Hands-on work experience in software engineering, preferably in roles involving code review, mentoring, or technical design discussions.
  • Significant experience using LLMs or AI coding assistants while programming, combined with a critical mindset for validating their output.
  • Excellent English writing skills, capable of producing clear, concise, and pedagogical technical explanations.
  • Strong proficiency with at least one major frontend framework (such as React, Angular, or Vue.js) or backend runtime (such as Node.js with Express or NestJS).
  • Minimum Bachelor’s degree in Computer Science or a closely related technical field.
  • Previous experience with AI data training, data annotation, or evaluation of AI-generated technical content is a strong plus; Minimum C1 English proficiency and a highly detail-oriented working style are required.
  • Preferred : contributions or merged PRs in JavaScript or TypeScript open-source projects, familiarity with bundlers and tooling (Webpack, Vite, Rollup), frontend–backend integration and Node.js runtime behavior, reviewing typed API layers, DTOs, or schema-driven designs, and experience evaluating frontend logic, async patterns, and state management.