Senior Product Engineer (.NET/C#/Claude Code)

ION; Newcastle upon Tyne; On-site; GBP 50,000 - 60,000; Full time

Benefits offered by this job

Company share option scheme

25 days annual leave

Birthday off

Flexible working hours

Pension

Job summary

ION, the UK''s leading financial infrastructure provider in education, is hiring for a software engineer to design and ship fintech products. You''ll work across the full development lifecycle, leveraging AI tools to accelerate delivery while ensuring production-grade quality.

Based in Newcastle upon Tyne with a hybrid schedule (3 days in office, 2 days remote), you''ll collaborate on cloud deployments, modern frontend/backend tech, and architectural decisions to improve software and processes.

Qualifications

• Several years of professional software development experience.
• Comfortable independently delivering production software.
• Experience with C# and .NET, or strong experience in another modern backend ecosystem.
• Experience with TypeScript and modern JavaScript.
• Experience with Next.js or similar modern frontend frameworks.
• Experience with relational databases and data modelling.
• Experience with APIs and integrations.
• Experience testing and debugging production applications.
• Experience with Git and collaborative software development.
• Experience with cloud infrastructure and application deployment.
• Experience reviewing code and making architectural decisions.

Responsibilities

• Design, build and ship financial technology products.
• Work across the development lifecycle from understanding the problem through to getting software into production.
• Explore existing systems and codebases to understand product problems.
• Turn product requirements into implementation plans.
• Use AI to accelerate implementation, review output, test it and ship it responsibly.
• Write, refactor and review code.
• Generate tests and investigate bugs.
• Research unfamiliar technologies and produce documentation.
• Automate repetitive engineering work.
• Take ownership of problems and contribute to better software design and architecture.

Skills

Software development

C#

.NET

TypeScript

JavaScript

Frontend development

Backend development

APIs

Testing

Git

Cloud

Code review

Architecture

Tools

Git

Azure

Next.js

Job description

Salary: £50,000 - 60,000 per year

Requirements:

• Several years of professional software development experience
• Comfortable independently delivering production software
• Experience with C# and .NET, or strong experience in another modern backend ecosystem
• Experience with TypeScript and modern JavaScript
• Experience with Next.js or similar modern frontend frameworks
• Experience with modern web application development
• Experience with relational databases and data modelling
• Experience with APIs and integrations
• Experience testing and debugging production applications
• Experience with Git and collaborative software development
• Experience with cloud infrastructure and application deployment
• Experience reviewing code and making architectural decisions

Responsibilities:

• Design, build and ship financial technology products
• Work across the development lifecycle from understanding the problem through to getting software into production
• Explore existing systems and codebases to understand product problems
• Turn product requirements into implementation plans
• Use AI to accelerate implementation, review output, test it and ship it responsibly
• Write, refactor and review code
• Generate tests and investigate bugs
• Research unfamiliar technologies and produce documentation
• Automate repetitive engineering work
• Take ownership of problems and contribute to better software design and architecture

Technologies:

• AI
• Backend
• C#
• Cloud
• Frontend
• Git
• JavaScript
• TypeScript
• Web
• ASP.NET
• Azure
• Blazor
• Claude Code
• Copilot
• Cursor
• GitHub
• LESS
• Machine Learning
• Sage
• Security

More:

We are ION, the UKs leading provider of financial infrastructure in the education sector. Our mission is to enable education providers to achieve financial sustainability through technology, innovation and data-driven insights. We help CFOs and finance teams in education work smarter and faster using modern cloud technology, and we are the UKs No. 1 cloud accounting technology provider for education and Sages No. 1 education partner. Our development team builds the technology behind our existing products as well as the next generation of software we believe the sector needs. We use modern AI development tools across our engineering workflow and encourage experimentation with new ways of building software. This role is a hybrid position based in our Great Park office, with 3 days in the office and 2 days at home, and includes benefits such as a company share option scheme, 25 days annual leave, birthday off, flexible working hours, pension, free onsite parking, casual dress, sick pay and modern AI development tooling.

last updated 38 week of 2026