Javascript Work, Jobs (with Salaries)

Software Developer
Veriscope.Digital —Remote
- £15 - £30 an hour
- Part-time
- Remote
- Computer Science
- JavaScript
- APIs
Quick apply
14d
Test Engineer
Evri —Remote
- £45,000 a year
- Temporary
- Remote
- DevOps
- Java
- AWS
- Employee assistance programme
- Employee discount
9d
Software Developer
Nordic Software and AI —Remote
- From £14 an hour
- Remote
- Azure
- English
- Java
- Work from home
Quick apply
13d
Frontend Developer - HTML, CSS, JavaScript, jQuery
Kate Matthews Solutions —London
- £45,000 - £55,000 a year
- AWS
- JavaScript
- Python
Software Developer
LEADPLUG LIMITED —Woolwich Riverside
- £38,500 a year
- Full-time
- Hybrid work
- Azure
- Java
- SQL
- Flexitime
Quick apply
Software Engineer, Front End
Enterprise League —Remote
- Full-time
- Remote
- English
- Maths
- JavaScript
Associate Software Trainee
Riasineck —West Ham
- £25,450 - £40,241 a year
- Full-time
- Azure
- Oracle
- Windows
Quick apply
4d
Founding Frontend Engineer
Innerworks —London
- £75,000 - £90,000 a year
- Full-time
- Hybrid work
- JavaScript
- APIs
- HTML
Quick apply
Junior Developer (Webflow)
Design by Structure —London
- £26,000 - £28,000 a year
- Full-time
- Hybrid work
- JavaScript
- Travel
- APIs
Quick apply
8d
Startup founder / CTO for health care/ Full stack developer
HealthOS UK —Remote
- From £45 an hour
- Temporary
- Remote
- Microsoft Powerpoint
- Microsoft Excel
- Azure
Quick apply
Web Developer
Ramark systems Ltd —Remote
- £34,000 - £45,000 a year
- Full-time
- Remote
- Azure
- AWS
- JavaScript
Quick apply
Front End Developer
FDM Group —London
- Remote
- JavaScript
- HTML
- Annual leave
Full-Stack Developer (Remote)
Softblues —London
- Remote
- English
- SQL
- AWS
- Annual leave
- Flexible schedule
Frontend Developer (React) Junior/Mid
Careerswift —London
- Full-time
- Remote
- JavaScript
- APIs
4d
Junior Software Engineer
Aivra Health —East London
- £30,500.70 - £60,500.70 a year
- Full-time
- Azure
- Computer Science
- Java
Quick apply
JavaScript Developer
Cambridge Intelligence —Cambridge
- Hybrid work
- JavaScript
- Annual leave
1d
UX Developer
Simplify Group —Remote
- £50,000 - £55,000 a year
- Full-time
- Remote
- Azure
- Continuous improvement
- JavaScript
- Referral programme
Quick apply
7d
Developer
Hounslow West Enterprises —London
- £3,000 - £5,000 a month
- Full-time
- Azure
- Java
- SQL
- Free parking
Quick apply
19h
Frontend Developer
Sonata One —London
- Hybrid work
- Azure
- Computer Science
- Bachelor's degree
- Annual leave
- Employee assistance programme
14d
Mid Software Engineer (Remote, United Kingdom)
Live Nation —Remote
- Full-time
- Remote
- DevOps
- JavaScript
- IT

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Software Developer

Veriscope.Digital
Remote

Quick apply

Job details

Part-time
£15 - £30 an hour
14 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

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