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Javascript Jobs in East York, ON

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Javascript • east york on

Last updated: 4 hours ago
Remote JavaScript Engineer - AI Trainer

Remote JavaScript Engineer - AI Trainer

SuperAnnotateToronto, 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: 30+ days ago
Vice President, Front Office Developer (Javascript / Typescript, Python, React)

Vice President, Front Office Developer (Javascript / Typescript, Python, React)

BMOToronto, Ontario, Canada
Part-time
BMO Capital Markets is a leading, full-service financial services provider.We offer corporate and investment banking, treasury management, as well as research and advisory services to clients aroun...Show moreLast updated: 30+ days ago
  • Promoted
Frontend Javascript Developer

Frontend Javascript Developer

ArternalToronto, Canada
Full-time
ARTERNAL CRM is a verticalized cloud-based SaaS software catering to art dealers and gallery staff.We have created a sales and marketing process to power transactions that were previously non-exist...Show moreLast updated: 22 days ago
  • Promoted
Senior Back-end JavaScript Developer

Senior Back-end JavaScript Developer

Carbonhound, Inc.Toronto, Canada
Full-time
Carbonhound supports almost 300 companies to help them automate measurement and reduce their climate impact.We are one of the fastest growing, and impactful companies in the space in Canada with a ...Show moreLast updated: 22 days ago
  • Promoted
Senior Full Stack Engineer (JavaScript, Python)

Senior Full Stack Engineer (JavaScript, Python)

TranscryptsToronto C6A, ON, Canada
Full-time
Proficient with Supabase (Postgres, Auth, RLS).Experience with Supabase Edge Functions using TypeScript.Familiarity with LLM APIs (OpenAI, Anthropic Claude, Google Gemini).Strong understanding of s...Show moreLast updated: 26 days ago
Software Engineer III - Front end (Javascript / Typescript)

Software Engineer III - Front end (Javascript / Typescript)

EmburseToronto
Full-time
At Emburse our mission is to help make our users’ lives – and their businesses – better.We are dramatically transforming how organizations manage corporate expenses and invoices.We humanize work by...Show moreLast updated: 30+ days ago
Software Developer — Full-Stack JavaScript - eCommerce

Software Developer — Full-Stack JavaScript - eCommerce

OriumToronto, Ontario
Remote
Full-time
This role is offered in partnership with Gluo, our sister company in Mexico.As part of our collaborative efforts, you will work closely with both our internal teams and Gluo to achieve our strategi...Show moreLast updated: 30+ days ago
JAVASCRIPT WEB DEVELOPER

JAVASCRIPT WEB DEVELOPER

ITS Global[Toronto, ON], Ontario
Full-time
Our client is looking for a JavaScript Web Developer to join their team.HTML, CSS, JavaScript, WP, React.Expert knowledge of JavaScript with a strong understanding of JavaScript fundamental.Experie...Show moreLast updated: 30+ days ago
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Full Stack Developer - JavaScript, Tailwind, Vue

Full Stack Developer - JavaScript, Tailwind, Vue

Astra North Infoteck Inc.Toronto, ON, ca
Full-time
Full Stack Developer - Javascript, Tailwind, Vue.As a Senior Full Stack Developer – Internal Audit Services, you will be a part of building impactful data-centric products, for Internal Audit (IA)....Show moreLast updated: 4 hours ago
  • Promoted
Senior JavaScript Developer

Senior JavaScript Developer

BrainberryToronto, Canada
Full-time
CSS3 (PostCSS, SASS) Modular CSS Performance A11Y Usability Working with RESTful APIs.Participation in interviewing future team members. Develop architecture solutions.Ongoing opportunities in an in...Show moreLast updated: 22 days ago
  • Promoted
Junior Developer (JavaScript, SQL, VBA, Automation)

Junior Developer (JavaScript, SQL, VBA, Automation)

BeachHeadToronto, Canada
Full-time
Are you passionate about coding and eager to support innovative automation solutions? Apply now!.Working with one of our top financial institution clients, this role calls for a Junior Developer (J...Show moreLast updated: 22 days ago
  • Promoted
Software Developer (Full-stack / JavaScript)

Software Developer (Full-stack / JavaScript)

ScotiabankToronto, Canada
Full-time
The Role Requisition ID : 243928.Join a purpose‑driven winning team, committed to results, in an inclusive and high‑performing culture. As a Fullstack Developer you will be joining a dynamic and ener...Show moreLast updated: 22 days ago
  • Promoted
Senior Full-Stack / Backend Engineer (Python & JavaScript)

Senior Full-Stack / Backend Engineer (Python & JavaScript)

JobgetherToronto, Canada
Full-time
Overview This position is posted by Jobgether on behalf of a partner company.We are currently looking for a Senior Full-Stack / Backend Engineer (Python & JavaScript) in Canada.We are seeking a highl...Show moreLast updated: 5 days ago
  • Promoted
Vice president, front office developer (javascript / typescript, python, react)

Vice president, front office developer (javascript / typescript, python, react)

BMO Financial GroupToronto, Canada
Part-time
Application Deadline : 02 / 19 / 2026.Job Family Group : Data Analytics & Reporting.BMO Capital Markets is a leading, full-service financial services provider. We offer corporate and investment banking, t...Show moreLast updated: 23 days ago
RQ10542 - Sr. Software Developer (Java / JavaScript)

RQ10542 - Sr. Software Developer (Java / JavaScript)

Source CodeToronto, ON, Canada
Full-time
Quick Apply
Software Developer (Java / JavaScript).ONSITE 5 days a week - Jarvis St.Required to translate technical systems specifications into working, tested applications. This includes : developing detailed pro...Show moreLast updated: 2 days ago
  • Promoted
Javascript Fullstack Engineer - Senior

Javascript Fullstack Engineer - Senior

LumenaltaToronto, Canada
Full-time
With over 20 years of fully remote experience, Lumenalta offers : Fully remote work Rapid growth opportunities Self-Improvement What You Will Work On. Collaborate with visionary enterprise clients Le...Show moreLast updated: 30+ days ago
Senior Full-stack Developer (JavaScript)

Senior Full-stack Developer (JavaScript)

Scotiabank Global SiteToronto, Ontario, Canada
Full-time
Join a purpose driven winning team committed to results in an inclusive and high-performing culture.We are looking for an experienced and highly skilled Senior Full-stack Developer to oversee and g...Show moreLast updated: 30+ days ago
  • Promoted
Senior Javascript Developer (React / Redux)

Senior Javascript Developer (React / Redux)

SwoonToronto C6A, ON, Canada
Remote
Full-time
Get AI-powered advice on this job and more exclusive features.Big Five global financial institutions.You will be responsible for developing the "mission control" interfaces used by professional tra...Show moreLast updated: 30+ days ago
Senior Software Engineer (Full-Stack JavaScript)

Senior Software Engineer (Full-Stack JavaScript)

MorningstarToronto
Full-time
Morningstar unites problem solvers with a clear goal : helping investors achieve their financialobjectives.As a leading investment research and data company, we stand out by how we apply our insight...Show moreLast updated: 13 days ago
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Remote JavaScript Engineer - AI Trainer

Remote JavaScript Engineer - AI Trainer

SuperAnnotateToronto, Ontario, CA
30+ 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.