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Javascript Jobs in London, ON

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Javascript • london on

Last updated: 23 hours ago
JavaScript Engineer

JavaScript Engineer

SuperAnnotateLondon, 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: 1 day ago
IT Engineer II

IT Engineer II

AffirmLondon, ON, CA
Full-time
Affirm is reinventing credit to make it more honest and friendly, giving consumers the flexibility to buy now and pay later without any hidden fees or compounding interest.We’re seeking a forward‑t...Show moreLast updated: 30+ days ago
Student, Robotic Process Automation Developer

Student, Robotic Process Automation Developer

General Dynamics Land Systems - Canada CorporationLondon, ON, CA
Full-time
Student, Robotic Process Automation Developer.Please indicate in the \"specific source\" field on your application where you met us! Include the name and / or location of the Hiring Event or Career F...Show moreLast updated: 30+ days ago
  • Promoted
Software Developer

Software Developer

ITPS (Canada) LTDLondon, ON, Canada
Full-time
A truly unique opportunity awaits one that is unmatched anywhere else.Whether you are early in your career and ready to take the right first step, or an experienced professional seeking a role that...Show moreLast updated: 30+ days ago
Software Developer III

Software Developer III

J.D. PowerLondon, ON, CA
Full-time
The Role : The Intermediate Software Developer contributes to all phases of the Software Development Lifecycle through the analysis, design, implementation, verification, and maintenance of software...Show moreLast updated: 30+ days ago
WordPress Engineer (Canada - Remote)

WordPress Engineer (Canada - Remote)

KanopiLondon, ON, CA
Remote
Full-time
Quick Apply
This position is open to applicants in Canada.Kanopi Studios is a Design, Development & Support Agency with a fully distributed team of people who are experts in. Our clients are mission-driven ...Show moreLast updated: 5 days ago
Server Engineer

Server Engineer

MusikwocheLondon, ON, CA
Full-time
Designing, prototyping and developing server-based multiplayer game systems.Working across synchronous and asynchronous gameplay, tournaments and events, matchmaking, leaderboards, DLC and more.Wor...Show moreLast updated: 30+ days ago
Senior Software Engineer

Senior Software Engineer

CARFAXLondon, ON, CA
Full-time
Join Team CARFAX as Senior Software Engineer - Back End.Isn't it time you bragged about where you work? At CARFAX, we do, every day. We pride ourselves on being mission-focused on helping to grow a ...Show moreLast updated: 30+ days ago
UI / UX Designer (Figma Focused)

UI / UX Designer (Figma Focused)

RM Staffing B.V.London, ON, CA
Full-time
We are seeking a creative and detail-oriented.You will collaborate closely with developers, product managers, and other stakeholders to translate user insights and business requirements into functi...Show moreLast updated: 30+ days ago
Sr. SharePoint Developer

Sr. SharePoint Developer

Medavie Blue CrossON, CA
Full-time +1
What makes us a different kind of employer?.As a national health solutions partner, Medavie is committed to improving the wellbeing of Canadians — and in our digital-first culture, technology is ke...Show moreLast updated: 30+ days ago
Principal Software Engineer

Principal Software Engineer

ServiceTitanCanada Ontario
Remote
Full-time
We’re looking for someone to lead all technical aspects of an engineering team at ServiceTitan.You must have a strong background in responsive web application development, building distributed syst...Show moreLast updated: 30+ days ago
Frontend UI Engineer for AI-Driven Web Apps

Frontend UI Engineer for AI-Driven Web Apps

lumalabs.aiLondon, ON, CA
Full-time
A leading AI company in London, Ontario, is seeking an experienced Frontend Engineer to join their team.This role involves building user-facing features for their innovative web application, collab...Show moreLast updated: 16 days ago
Intermediate Full-Stack Java Developer

Intermediate Full-Stack Java Developer

WinAirLondon, Ontario, Canada
Full-time
Reporting to the Development Manager the Intermediate Full-Stack Java Developer will be a proactive enthusiastic team member responsible for contributing to the development enhancement and maintena...Show moreLast updated: 20 days ago
Senior Front-End Developer - Toronto (Hybrid)

Senior Front-End Developer - Toronto (Hybrid)

Info-Tech Research GroupLondon, ON, CA
Full-time
Info-Tech Research Group delivers impartial, highly pertinent IT research, enabling CIOs and IT leaders to make well-informed, strategic decisions. We are currently serving over 30,000 professionals...Show moreLast updated: 12 days ago
(Senior) Solution Delivery Engineer - North America

(Senior) Solution Delivery Engineer - North America

TrackunitLondon, ON, CA
Full-time
Join to apply for the (Senior) Solution Delivery Engineer - North America role at Trackunit.To help our customers succeed, we’re searching for a. IrisX is not only implemented, but fully adopted and...Show moreLast updated: 18 days ago
Conseiller(ère) en Développement Web (Volontariat Virtuel)

Conseiller(ère) en Développement Web (Volontariat Virtuel)

Cuso InternationalLondon, Ontario
Full-time
Le partenaire lié à cette affectation est situé en : .Kinshasa, République démocratique du Congo.Français Niveau 5 - Pleine maîtrise. L'éligibilité : Ouvert uniquement aux citoyens et résidents perma...Show moreLast updated: 27 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
  • Promoted
Fleet Management Systems Database Specialist

Fleet Management Systems Database Specialist

General Dynamics Land SystemsLondon, ON, Canada
Full-time
Provide guidance and technical assistance to Technicians relative to data entry (CSETS) for LAV 6.Retrofit & Repair Program (RRP). Collaborate with other ATMP team members to maintain, troublesh...Show moreLast updated: 23 hours ago
  • Promoted
Senior Embedded Software Developer

Senior Embedded Software Developer

ZTRLondon, ON, Canada
Full-time
Join us in Advancing the Environmental Global Impact within the Rail Industry.For nearly 40 years, ZTR has designed, developed and released products that have a positive environmental impact within...Show moreLast updated: 30+ days ago
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The cities near London, ON that boast the highest number of javascript jobs are:
JavaScript Engineer

JavaScript Engineer

SuperAnnotateLondon, Ontario, CA
1 day 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.