Back end developers Work, Jobs in Grays, Ess (with Salaries)

Full-Stack JavaScript Developer
P & J Moore Limited —Upminster
- £40,000 - £60,000 a year
- Full-time
- SQL
- In-person
- Communication skills
- Free parking
Quick apply
Symfony (PHP) Developer
M10c —London
- £45,000 - £65,000 a year
- Full-time
- Hybrid work
- Software troubleshooting
- Maintenance
- In-person
- Work from home
Quick apply
Junior Software engineer
vServices —London
- Computer Science
- Bachelor's degree
- Agile
Junior Front End Developer
Byte9 —London
Native Mobile Application (iOS/Android) Developer - PerfectDraft
Anheuser-Busch —London
- Full-time
- AI
- Employee assistance programme
Web Developer
Desi Tailors Limited —Barking
- £34,000 - £44,000 a year
- Full-time
- CRM software
- Computer Science
- Software troubleshooting
- Relocation assistance
- Flexitime
Quick apply
13d
Frontend Developer - HTML, CSS, JavaScript, jQuery
Kate Matthews Solutions —London
- £45,000 - £55,000 a year
- AWS
Web Developer Intern
AP Homes LTD —South Kensington Station
- Hybrid work
- Computer Science
- In-person
- AI
Quick apply
6d
PHP Developer
vServices —London
- System design
- Databases
- Presentation skills
PHP laravel developer.
Fifteen —London
- Monday to Friday
- Software troubleshooting
- Communication skills
Software Developer Apprentice
QA Apprenticeships —Sevenoaks
- £26,000 - £30,000 a year
- Full-time
- Hybrid work
- Annual leave
4d
Web Designer/Front end developer
Amplefuture —London
- Software troubleshooting
- HTML
Android Developer
Akshara Consultancy —London
- Java
Senior Frontend Engineer (Web & App)
Quantum —Maidstone
- Full-time
- Hybrid work
- Communication skills
React Frontend Developer
Orka Informatics —London
- Computer Science
- Engineering
- Bachelor's degree
Software Engineer
Longshot Systems Ltd —London
- Full-time
- Hybrid work
- English
- Java
- Master's degree
- Gym membership
Quick apply
Software Engineer, New Grad
Deliveroo —London
- Full-time
- Hybrid work
- Computer Science
- Mentoring
- Software development
Junior / Mid-Level Full Stack Developer
NECSWS —London
- Full-time
- Remote
- Computer Science
- Engineering
- Agile
- Annual leave
Quick apply
Software Engineer-Early Career
Yellowbrick Data —London
- Hybrid work
- Software troubleshooting
- SQL
- Machine learning
Quick apply
Full Stack Developer (Flutter-focused)
Big Potato —London
- Full-time
- Hybrid work
- APIs
- AI
- Employee assistance programme
Quick apply

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Full-Stack JavaScript Developer

P & J Moore Limited
Upminster

Quick apply

Job details

Full-time
£40,000 - £60,000 a year

Benefits

Free parking
Casual dress
On-site parking

Qualifications

React
SQL querying
Microsoft SQL Server
SQL
Express.js
Docker
SCSS
Redis
Back-end development
Front-end development
Web services
Unit testing
Communication skills
NGINX

Full job description

Location

Upminster, Essex, UK

Working pattern

On Site

Salary

£40,000-£60,000, depending on experience

Employment type

Full-time

The opportunity

We're building a multi-brand claims-acquisition platform that guides consumers through the complete online claims journey, from their first visit through identity verification, e-signature and submission.

As a Mid-Level Full-Stack JavaScript Developer, you'll work across the platform: a React single-page application on the front end, Node.js APIs and background workers on the back end, and Microsoft SQL Server as the system of record.

This is a hands-on product engineering role where you'll ship customer-facing journey steps, build and consume REST APIs, write database migrations and integrate third-party services behind clean, maintainable interfaces.

What you'll do

Build and maintain customer-journey screens and shared components in React 19, using React Router 7, Vite and Sass/SCSS across multiple branded sites from a single codebase.
Develop back-end features in Node.js, including a Fastify API, an Express backend-for-frontend and durable background jobs processed through a SQL-backed outbox queue.
Design and evolve the SQL Server schema through forward-only migrations, using parameterised queries and transactional business logic.
Integrate and mock third-party services, including identity-verification and lead-management providers, while keeping transport details behind well-defined interfaces.
Write meaningful tests at every layer: Vitest unit and route tests, Testing Library component tests, and Playwright end-to-end journeys against a real database running in Docker.
Build with the needs of a regulated consumer product in mind, including robust input validation, careful PII handling, audit trails, idempotent retries and graceful degradation.
Work collaboratively to document technical decisions, follow established conventions and improve the platform as it grows.

What you'll bring

At least three years of professional JavaScript development experience, with meaningful hands-on work across both front-end and back-end development.
Strong React fundamentals, including hooks, controlled forms, routing and state management, together with confidence using modern ESM tooling.
Experience building and consuming REST APIs in Node.js using Fastify, Express or a comparable framework.
Practical SQL knowledge covering schema design, joins, transactions and indexes. SQL Server experience is helpful but not essential.
A genuine testing habit: you write useful tests because they prevent defects and support confident delivery, not simply because the CI pipeline requires them.
Clear written communication and the ability to document decisions, explain trade-offs and work within established conventions.

Nice to have

Experience working on multi-tenant or multi-brand products.
Familiarity with queue or outbox patterns, Redis, PM2, nginx or Cloudflare.
Exposure to regulated industries such as claims, finance or insurance, or experience with KYC and identity-verification journeys.

Our technology stack

Pay: £40,000.00-£60,000.00 per year

Benefits:

Casual dress
Free parking
On-site parking

Work Location: In person

Quick apply

Refine Your Search

back end developers jobs in grays, ess

Full-Stack JavaScript Developer

Symfony (PHP) Developer

Junior Software engineer

Junior Front End Developer

Native Mobile Application (iOS/Android) Developer - PerfectDraft

Web Developer

Frontend Developer - HTML, CSS, JavaScript, jQuery

Web Developer Intern

PHP Developer

PHP laravel developer.

Software Developer Apprentice

Web Designer/Front end developer

Android Developer

Senior Frontend Engineer (Web & App)

React Frontend Developer

Software Engineer

Software Engineer, New Grad

Junior / Mid-Level Full Stack Developer

Software Engineer-Early Career

Full Stack Developer (Flutter-focused)

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