Software development · Data & analysis
Meddalwedd is a UK software development company working in C#, .NET, ASP.NET Core MVC and SQL Server. We build business applications and the data platforms behind them — then host them, run them and answer for them every month.
What we do
Building the application is the job. Doing it properly means handling the data underneath it and running the thing once it is live — so we do those too, rather than leaving them as somebody else's problem.
Business applications in C# and .NET, built to still make sense in fifteen years — because one of ours has had to.
Over twenty years of commercial development sits behind that. Our crime analytics platform has been live and serving subscribers since 2011, and was rebuilt on modern .NET without ever going dark. Keeping software alive that long teaches you things no greenfield project ever will.
Full web applications on the current .NET release — authentication, billing, admin tooling, search, reporting and everything unglamorous in between. Layered properly, so the business logic is not trapped inside a controller, and tested where a customer would notice it breaking.
How we do itGetting large, awkward datasets into a shape you can actually build on, and keeping them that way month after month.
We run what we build on Azure. Not a handover and a wave — an obligation to keep the thing up, patched and observable.
Warehousing, modelling and reporting on the Microsoft data platform — turning records into a defensible number, and into something a board or an agent can use.
Our work
The clearest evidence we can offer is work we are still responsible for. Each of these went from an empty repository to a live service on a monthly data cycle — and we still run them.
A defensible answer to “how safe is this location?”
Police data turned into a weighted, population-adjusted safety score for every neighbourhood in England and Wales — with specialist reports for safeguarding leads, estates managers and employers.
Know what a used car is likely to cost you, before you buy it.
MOT history and a failure-risk score for any UK registration, benchmarked against every comparable test for that exact model and age. Free and open, which puts the whole product in the query layer.
Postcode in, coordinates and census geography out.
The reference layer under everything else we build — every UK postcode resolved to latitude and longitude, LSOA, local authority, region, population and deprivation decile.
A quiet record of when you last did the things that matter.
Habits to maintain, behaviours to space out and events worth observing. Everything stays on the device — a constraint designed in from the first commit, not bolted on.
Open data
Three of the four products above are built on freely available public datasets. Free to download is not the same as ready to use: open data arrives inconsistent, incomplete, revised without notice and keyed to geographies that refuse to line up. All of the value is in what happens next.
Raw sources land in a warehouse, get modelled into something dependable, and come out as reports people act on — on Microsoft Fabric and Power BI. It is where a dataset gets understood before anything is built on top of it, and a deliverable in its own right where a client wants the analysis rather than an application.
The same governed model is what an AI agent needs to answer questions about your data without inventing them. Public data, your own internal data, or the two joined together — which is usually where the sharpest questions live.
Platform & credentials
One platform, end to end — C# and .NET for everything we build, SQL Server for everything we store, and Azure for everything we run. Committing to a single stack means fewer seams, fewer surprises, and one place to look when something needs explaining. We hold Microsoft certifications across the areas that matter to the work.
Microsoft certifications are held by our practice lead.
Get in touch
Whether it is a dataset you cannot get value out of, a .NET application that has outgrown its original shape, or a product that needs building from nothing — we would be glad to hear about it.
info@meddalwedd.co.uk