Junior software developer (c#/html/api) Work, Jobs in London, England (with Salaries)

Junior / Intermediate Developer
Stonerise Technology Ltd —London
- £40,000 - £50,000 a year
- Full-time
- ERP systems
- Master's degree
- APIs
- Annual leave
Quick apply
19h
Front Office Software Engineer
CMC Markets —London
- Full-time
- Computer Science
- Maths
- Mentoring
22h
Senior QA Engineer
Cancer Research UK —London
- £50,000 - £55,000 a year
- Full-time
- Analysis skills
- Mentoring
- Agile
18h
Senior Engineer- Platform Engineering
Janus Henderson —London
- Hybrid work
- Computer Science
- DevOps
- Engineering
Senior SDET
Radiant —London
- Full-time
- Hybrid work
- Master's degree
- Annual leave
Quick apply
AI Enablement Specialist, Associate Director
Fitch Group —London
- Bachelor's degree
- Financial services
- Training & development
Senior Platform Engineer, Infrastructure - Core UK & IRE
Fanatics Betting & Gaming —London
- £96,000 - £120,000 a year
- Full-time
- Remote
- Travel
- Mentoring
- Communication skills
Quick apply
Senior Platform SRE
IG Group —London
- Full-time
- Hybrid work
- Presentation skills
- Mentoring
- Communication skills
- Gym membership
- Life insurance
8d
Senior AI Engineer
NowVertical —London
- Hybrid work
- Azure
- Master's degree
- Mentoring
Quick apply
Senior Ecommerce Business analyst
LTM —London
- Full-time
- Software troubleshooting
- Salesforce
- Mentoring
Quick apply
Senior Platform Engineer
Xapien —London
- Full-time
- Hybrid work
- DevOps
- Mentoring
- Communication skills
- Life insurance
Senior Product Security Engineer
Blockchain.com —London
- Full-time
- Remote
- AI
- SDLC
Quick apply
Lead Site Reliability Engineer (AWS)
British Council —London
- Azure
- DevOps
- English
Senior Engineer, Network Observability
CoreWeave Europe —London
- Computer Science
- Engineering
- Bachelor's degree
- Employee assistance programme
Quick apply
Project Manager/Business Analyst - DV Cleared
Turner & Townsend —London
- Full-time
- SQL
- Analysis skills
- Travel
Quick apply
Senior Engineering Lead, Index Distribution
London Stock Exchange Group —London
- Full-time
- Hybrid work
- AWS
- Analysis skills
- Mentoring
Senior Software Engineer
Online Filings —London
- £50,000 - £65,000 a year
- Full-time
- Hybrid work
- Computer Science
- Master's degree
- Bachelor's degree
- Employee discount
Quick apply

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Junior / Intermediate Developer
Stonerise Technology Ltd —London
Writing AWS Lambda functions for background processing, including invoice OCR and matching, purchase order validation, quotation matching, inbound email…
£40,000 - £50,000 a year
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19h

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junior software developer (c#/html/api) jobs near london, england

Junior / Intermediate Developer

Stonerise Technology Ltd
London

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Job details

Permanent | Full-time
£40,000 - £50,000 a year
19 hours ago

Benefits

Casual dress
Annual leave
Company pension

Qualifications

Law
Purchase order matching processing
React
ERP systems
Git
Data and database experience
Master's degree
Express.js
Docker
CI/CD pipelines
PostgreSQL
Continuous integration
Redis
SDKs
Back-end development
GitHub
APIs
Front-end development
S3
Unit testing
DynamoDB
AI
Software development or architecture experience
TypeScript
Communication skills
Supplier invoice processing

Full job description

About us

StoneRise builds a multi-tenant ERP platform for the [construction / built environment] sector. It is a single product suite covering procurement, HR, commercial management, subcontractor payments, site management, health and safety, and training, used daily by teams running live projects.

You would be joining a mixed engineering team of onshore developers based in our London office and offshore developers working alongside us.

This is an office based role at our Kings Cross / Camden office, five days a week.

The role

We are looking for an intermediate developer to join our engineering team. You will work across the full stack, covering Next.js front ends, Fastify APIs, PostgreSQL and Prisma data models, and AWS Lambda background jobs.

This is a hands on role for someone comfortable owning a feature from database schema through to UI. You will get plenty of ownership, code review from senior engineers, and exposure to a broad stack.

As we work across time zones, clear written communication is important. That means good pull request descriptions, clear tickets, and flagging blockers early.

What you will be working on

Building features across our Next.js applications (admin shell, procurement, HR, commercial) using the App Router, React and our shared component library
Designing and building REST endpoints in our Fastify microservices with typed request and response schemas
Modelling data in PostgreSQL via Prisma, extending a large multi-tenant schema
Writing AWS Lambda functions for background processing, including invoice OCR and matching, purchase order validation, quotation matching, inbound email processing, accounting sync, and scheduled notifications
Integrating third party services including Stripe for billing, accounting systems, Microsoft Graph, Pusher for real time updates, and Twilio
Working on AI assisted features such as document data extraction and invoice matching
Writing unit, integration and end to end tests in Jest
Reviewing code from across the team and contributing to the shared internal packages used throughout the platform

Tech stack

Language and tooling

TypeScript
Node.js 24
Turborepo monorepo with Yarn 4 workspaces
ESLint, Prettier
GitHub Actions for CI/CD across dev, test, staging and production

Front end

Next.js 14 (App Router)
React 18
Tailwind CSS
TanStack Query
Shared in-house component library
Heroicons
PDF generation and preview, spreadsheet import and export

Back end

Fastify 5 microservices with TypeBox schema validation
Next.js API routes as a BFF layer
JWT based authentication with role and permission based authorisation
Multi-tenant architecture with tenant level data isolation

Data and infrastructure

PostgreSQL
Prisma ORM
Redis (ioredis)
BullMQ for job queues
AWS Lambda, S3, SQS, SNS, DynamoDB, CloudWatch, CloudFront
LocalStack and Docker for local development

AI and integrations

Anthropic SDK and an in-house AI service layer
Stripe
Microsoft Graph
Pusher
Twilio
Nodemailer
Accounting system integrations

Quality and monitoring

Jest for unit, integration, end to end, performance and security tests
Sentry for error monitoring
Structured logging
OpenAPI and Apidog for API documentation

What we are looking for

Essential

2 to 4 years of commercial software development experience
Strong TypeScript and JavaScript
Solid React experience, and experience with Next.js or a similar SSR framework
Experience building Node.js back end services and REST APIs
Working knowledge of relational databases and SQL, ideally with an ORM such as Prisma, TypeORM or Drizzle
Comfortable with Git, pull requests and code review
Able to write tests for your own work
Clear communicator in writing as well as in person, as you will be working daily with colleagues in other time zones
Able to work full-time from our Kings Cross / Camden office

Desirable

Strong understanding and experience using AI assisted coding such as Cursor
Fastify, Express or NestJS
AWS services, particularly Lambda, S3 and SQS
Monorepo tooling such as Turborepo or Nx, or Yarn and pnpm workspaces
Redis, message queues or other background job systems
Tailwind CSS
Multi-tenant SaaS
Working with LLM APIs or AI assisted product features
CI/CD pipelines and GitHub Actions
Experience working in a distributed or partly offshore team
Exposure to ERP, finance or construction software

What we offer

£40,000 to £50,000 depending on experience
Central London office in Kings Cross / Camden
20 days annual leave + public holidays + company Christmas/New Year shut down
Company pension scheme
Ownership of features from design through to production
Broad exposure across front end, back end, cloud infrastructure and AI features
Mentoring from senior engineers and a clear path to senior

Pay: £40,000.00-£50,000.00 per year

Benefits:

Casual dress
Company pension

Work Location: In person

Quick apply

Refine Your Search

junior software developer (c#/html/api) jobs in london, england

Junior / Intermediate Developer

Front Office Software Engineer

Senior QA Engineer

Senior Engineer- Platform Engineering

Senior SDET

AI Enablement Specialist, Associate Director

Senior Platform Engineer, Infrastructure - Core UK & IRE

Senior Platform SRE

Senior AI Engineer

Senior Ecommerce Business analyst

Senior Platform Engineer

Senior Product Security Engineer

Lead Site Reliability Engineer (AWS)

Senior Engineer, Network Observability

Project Manager/Business Analyst - DV Cleared

Senior Engineering Lead, Index Distribution

Senior Software Engineer

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