Javascript developer javascript html5 Work, Jobs (with Salaries)

Software Developer
Veriscope.Digital —Remote
- £15 - £30 an hour
- Part-time
- Remote
- Computer Science
- JavaScript
- APIs
Quick apply
4d
Software Developer
Miriam Farid, Inc. —Remote
- £27,342.07 - £83,616.84 a year
- Temporary
- Remote
- Azure
- Java
- SQL
- Profit sharing
- Employee discount
Quick apply
17h
Web Developer
Value Tech Labs Limited —Remote
- £30,000 - £45,000 a year
- Full-time
- Remote
- Azure
- DevOps
- AWS
Quick apply
Web Developer
Ramark systems Ltd —Remote
- £34,000 - £45,000 a year
- Full-time
- Remote
- Azure
- AWS
- JavaScript
Quick apply
11d
Junior Front End Developer
Byte9 —London
- JavaScript
- APIs
- HTML
Software Developer
Nordic Software and AI —Remote
- From £14 an hour
- Remote
- Azure
- English
- Java
- Work from home
Quick apply
3d
Software Developer
Agile Info Solutions Ltd —Milton Keynes
- £40,000 - £43,000 a year
- Full-time
- Hybrid work
- Computer Science
- Engineering
- Bachelor's degree
- Work from home
- Sick pay
Quick apply
2d
Founding Frontend Engineer
Innerworks —London
- £75,000 - £90,000 a year
- Full-time
- Hybrid work
- JavaScript
- APIs
- HTML
Quick apply
11d
Front End Developer
JE Consulting —Sutton Coldfield
- Up to £31,000 a year
- Full-time
- Hybrid work
- JavaScript
- HTML
Quick apply
Fullstack Developer - Python, Django, HTML, CSS, JavaScript
Kate Matthews Solutions —London
- £65,000 - £75,000 a year
- Computer Science
- AWS
- JavaScript
Web Designer/Front end developer
Amplefuture —London
- JavaScript
- HTML
Front End Developer
FDM Group —London
- Remote
- JavaScript
- HTML
- Annual leave
Web Developer
HARBORPOINT HOLDINGS LIMITED —Epsom
- £41,000 - £47,000 a year
- Full-time
- Computer Science
- Bachelor's degree
- JavaScript
- Free parking
- Life insurance
Quick apply
1d
Front-End Developer
vServices —London
- Bachelor's degree
- JavaScript
- Scripting
Web Developer
NORTHFIELD FUSION LTD —Sheffield
- £40,000 - £46,000 a year
- Full-time
- Azure
- AWS
- Analysis skills
- Free parking
- Life insurance
Quick apply
4d
Full Stack Developer
Consilience Group —London
- £55,000 - £85,000 a year
- Computer Science
- AWS
- JavaScript
Web Developer
This is Fuller —King's Lynn
- £26,500 - £36,000 a year
- Full-time
- Hybrid work
- JavaScript
- AI
- Communication skills
Quick apply
10h
Graduate Developer
Visionist Consulting —Newport
- Full-time
- Azure
- Java
- SQL
Software Developer
Artech3D Ltd —London
- £43,000 - £55,000 a year
- Full-time
- Azure
- Java
- SQL
Quick apply
9d
Web Developer
Riverea Creative Media —London
- £50,000 - £56,000 a year
- Full-time
- JavaScript
- APIs
- Agile
- Free parking
- Life insurance
Quick apply
13d

I want to receive the latest job alerts for javascript developer javascript html5

By signing in to your account, you agree to SimplyHired's Terms of Service and consent to our Cookie and Privacy Policy.

Software Developer

Veriscope.Digital
Remote

Quick apply

Job details

Part-time
£15 - £30 an hour
4 days ago

Qualifications

Computer Science
CSS
React
iOS
Git
JavaScript
GitHub
APIs
UI
HTML

Full job description

Job Overview

Content Sieve is an AI-powered Chrome extension (Manifest V3) that filters web content by topic across any website, using OpenAI's API via a Cloudflare Worker proxy to intelligently distinguish genuine topic matches from false positives. The extension is live on the Chrome Web Store with a working free/premium tier model and Stripe subscription billing already in place. We are looking for a developer to help extend its capabilities, improve filtering accuracy, and build toward a more polished product.

Responsibilities

Develop, test, and deploy updates to a Manifest V3 Chrome extension using vanilla JavaScript, working across content scripts, background service workers, and the popup UI.
Improve and extend the core AI filtering logic, including the keyword-first gate and dual-model routing between GPT-4.1-nano (free tier) and GPT-4.1-mini (premium tier).
Maintain and enhance the Cloudflare Worker back end, including the /api/check-content, /api/validate-key, /api/checkout, and /api/stripe-webhook endpoints.
Work with Cloudflare KV namespaces for licence key storage and free-tier daily cap enforcement.
Extend or improve the Stripe integration, including checkout session creation, webhook handling, and licence key generation on successful payment.
Improve DOM traversal logic in the content script for more reliable card detection across deeply nested React and Next.js page structures.
Maintain and improve the popup UI, built in HTML, CSS, and vanilla JavaScript.
Manage session caching logic and client-side rate limiting (token bucket) to minimise unnecessary AI calls.
Use Git and GitHub for version control throughout.
Document architectural decisions and deployment steps clearly for ongoing reference.
Help build the Android and iOS version

Experience

Demonstrable experience building Chrome extensions using Manifest V3, including content scripts, background service workers, and the Chrome messaging API.
Strong proficiency in vanilla JavaScript, including asynchronous patterns, chrome.storage.sync, and browser extension APIs.
Hands-on experience with Cloudflare Workers and Wrangler, including KV namespace management and secret configuration.
Familiarity with the OpenAI Chat Completions API and prompt design for classification tasks.
Experience integrating Stripe, including checkout sessions, webhook verification (HMAC-SHA256), and subscription lifecycle events.
Solid understanding of HTML5 and CSS3 for extension popup and options UI work.
Version control with Git and GitHub is essential.
Experience with DOM traversal and content manipulation across diverse page structures, including React and Next.js sites, is a strong advantage.
Prior experience shipping a published browser extension is strongly preferred.
A Computer Science or related degree preferable but not compulsory.

Before You Apply

We ask that all candidates install Content Sieve from the Chrome Web Store or www.veriscope.digital and spend a few minutes using it before submitting an application. We're looking for a brief professional assessment alongside your application: what works well, what doesn't, and where you see the clearest opportunities for improvement — whether in filtering accuracy, UI, performance, or architecture.

This isn't a test with a right answer. It tells us how you think about an existing codebase and a real product, and it means any conversation we have from the first message is grounded in direct experience of what you'd be working on.

The extension is free to install. Find it at the Chrome Web Store or www.Veriscope.Digital

Pay: £15.00-£30.00 per hour

Application question(s):

Take a look at Content Sieve, what improvements would you suggest to the product?

Work Location: Remote

Quick apply

Refine Your Search

javascript developer javascript html5 jobs

Software Developer

Software Developer

Web Developer

Web Developer

Junior Front End Developer

Software Developer

Software Developer

Founding Frontend Engineer

Front End Developer

Fullstack Developer - Python, Django, HTML, CSS, JavaScript

Web Designer/Front end developer

Front End Developer

Web Developer

Front-End Developer

Web Developer

Full Stack Developer

Web Developer

Graduate Developer

Software Developer

Web Developer

I want to receive the latest job alerts for javascript developer javascript html5

Related Searches

Explore jobs in more locations

Jobseeker tools

Employer Tools

Browse

Stay Connected