We build the software businesses run on.
Ratesoft Solutions designs, builds and runs .NET, web and cloud systems for clients, and ships its own SaaS products for UK accountancy practices and developers.
Build, modernise, advise.
Three ways we help clients, delivered by the same senior engineers who build our own products.
Build
New products and systems
From a single API to a multi-tenant SaaS platform, designed and delivered by senior engineers.
SaaS platform engineering
Web & API development
Business applications
Mobile
You get
- Architecture & delivery plan
- Tested, production-ready code
- CI/CD and documentation
.NET 10 · ASP.NET Core · React · TypeScript
Modernise & scale
Faster, safer, cloud-ready
Bring existing systems up to date and make slow, fragile software predictable.
.NET modernisation
Cloud: Azure & AWS
Database optimisation
You get
- Assessment & roadmap
- Measured before/after results
- Staged cut-over plan
Azure · AWS · SQL Server · PostgreSQL
Advise & support
Decisions and day-to-day help
An experienced second opinion before you commit, and dependable support once you have.
Technology consulting
Finance & business systems
Ongoing support
You get
- Architecture reviews
- Written recommendations
- Support arrangement
Remote-first · On site in London
Software we build, ship and maintain.
Alongside client work we build products of our own, on the same engineering standards.
Reliefwise
EIS & SEIS compliance for UK accountancy practices.
Chase founder certificates, track holding periods and clawback risk, find missed loss relief, and export filing-ready schedules.
50%
SEIS relief
30%
EIS relief
3 yrs
holding period
Product tour and portfolio relief check
Sheetwright
A .NET library that writes .xlsx files, and reads back the ones it wrote.
$ dotnet add package SheetwrightView library
Plinth — our multi-tenant SaaS framework for .NET 10
The foundation under our products: identity, tenant isolation, reliable messaging and observability, built properly once.
A small team with senior hands
Senior, hands-on delivery
You work directly with the person who designs and writes the software, not a layer of account management.
Standard tools, no lock-in
Mainstream, well-supported technology and repeatable engineering practice, so you are never tied to one supplier.
Remote or on site
Remote by default, on site when it helps. Based in London.
We ship our own products
The same engineering goes into our own applications, so we live with the long-term consequences of our design choices.
Have a system to build, fix or run?
Tell us what you are working on. You will hear back from an engineer, not a sales team.