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Javascript developer Jobs in London, ON

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Javascript developer • london on

Last updated: 1 day 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
Firmware Developer

Firmware Developer

Trudell Medical InternationalLondon, ON, CA
Full-time
Trudell Medical International Inc.Baransway Drive, London, Ontario, Canada.Posted Tuesday, December 2, 2025 at 5 : 00 AM. At Trudell Medical International (TMI), we pride ourselves on our passion for ...Show moreLast updated: 10 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
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
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
Senior Backend Developer

Senior Backend Developer

ZTR Control SystemsLondon, ON, CA
Full-time
Join us in Advancing the Environmental Global Impact within the Rail Industry ZTR is a leading global railway technology company that modernizes and digitally connects railway rolling stock to help...Show moreLast updated: 30+ days ago
Student, Software Developer

Student, Software Developer

General Dynamics Land Systems–CanadaLondon, ON, CA
Full-time
We are looking for someone to join our software development team who can contribute to the development of high quality software solutions for the family of Light Armoured Vehicles and who is willin...Show moreLast updated: 10 days ago
Senior Power Platform Developer

Senior Power Platform Developer

KPMG CanadaLondon, ON, CA
Full-time
At KPMG, you’ll join a team of diverse and dedicated problem solvers connected by a common cause turning insight into opportunity for clients and communities worldwide. Design, develop, and deploy s...Show moreLast updated: 30+ days ago
  • Promoted
Electrical Systems Developer

Electrical Systems 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
Data Warehouse Developer

Data Warehouse Developer

STACK IT RecruitmentLondon, ON, CA
Remote
Full-time +1
Quick Apply
Are you passionate about designing powerful data solutions and transforming complex information into high-performance analytics? . In this role, you’ll take the lead in architecting, optimizing...Show moreLast updated: 19 days ago
Software Developer

Software Developer

RedIron Technologies Inc.London, ON, CA
Full-time
We are a retail systems integrator and software provider that helps you design, implement, integrate, and maintain any major retail software platform — legacy or cutting edge.At RedIron, we come to...Show moreLast updated: 30+ days ago
Software Developer

Software Developer

LYNKED Inc.London, ON, CA
Full-time
Location : London, ON (in-office).LYNKED is at the forefront of providing innovative technology solutions that drive efficiency and sustainability. With a diverse product portfolio that includes smar...Show moreLast updated: 27 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
Developer Software III Drupal

Developer Software III Drupal

Canadian Blood Services Stem Cells for LifeLondon, Ontario, Canada
Full-time
Please note this role will work in a hybrid environment.The successful candidate must be located near a Canadian Blood Services site and will be working a mixture of on-site and off-site work based...Show moreLast updated: 30+ 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
  • Promoted
Student, Robotic Process Automation Developer

Student, Robotic Process Automation Developer

General Dynamics Land SystemsLondon, ON, Canada
Full-time
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 Fair you attended.The anticipated start...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
Java Backend Developer

Java Backend Developer

AIFA SolutionsLondon, ON, CA
Full-time
Design, develop, and test different pieces of software & features throughout the development life cycle.Support and secure the platform’s architecture through the implementation of cybersecurity in...Show moreLast updated: 1 day ago
Software Developer Insurance Rules

Software Developer Insurance Rules

Cognition+London, Ontario, Canada
Full-time +1
Cognition where we are dedicated to revolutionizing the insurance industry with cutting-edge digital solutions.Since 1996 we have been committed to understanding and addressing the unique business ...Show moreLast updated: 25 days ago
People also ask
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.