Senior Developer | Java or C# & C/C | Financial Data Software House
- Salary: £70,000 circa (depending on experience)
- Location: Fully remote across the UK, with occasional London trips for socials and events (around four a year, at your own cost)
- Team: joining a dev team of six as a senior
They build the financial-data software that thousands of investors and finance professionals rely on every day: live prices, charts, and deep company fundamentals, all in one place. It's a small, long-established, profitable business, ISO 27001 certified and London-based. The dev team is six, and they're hiring a senior developer, which is where you come in.
You'll join as a Senior Developer working right across the stack, from the client-side JavaScript through to a Java, C# and C backend that processes hundreds of thousands of market messages a second. The team doesn't just build the product, it keeps it running, so you'll get to know the whole system and take real ownership of keeping it up for customers. This is genuinely remote, not remote-with-strings, with the odd trip to London for the socials and the occasional get-together.
Non-Negotiables
- Java or C# (the platform has both, so strong in one and happy to look after the other on the job)
- JavaScript, HTML, CSS
- C or C exposure (doesn't have to be recent, university or early-career counts)
- Low-level and multi-threaded coding
- SQL (any flavour, MySQL in house)
- DevOps experience, and a genuine willingness to help keep a live service up
What You'll Work With
- A web platform with both Java and C# in the codebase
- A C real-time feed handling hundreds of thousands of market messages a second
- A large, long-running store of historical market price data
- Self-hosted infrastructure across multiple data centres, on Linux
- A code-review process before anything ships
- Revision control moving from CVS to Git this summer
Nice to Haves
- Team leading or mentoring
- Networking and Linux internals (TCP/IP, protocols, socket programming)
- A degree in computer science or a numerate discipline
- A real interest in financial markets
- Unit testing or structured-testing experience
- Docker and containerisation
Why Join / Projects
The company and management team are very open to change. The stack has been kept deliberately lean over the years and there's now a clear appetite to modernise: moving off CVS onto Git, standing up a proper CI/CD process, and bringing in Docker and containerisation. If you've got opinions on how a small team should ship software in 2026, they want to hear them, and you'll actually see your suggestions land.
There's real engineering waiting too. A major data-format migration for one of their key suppliers should be wrapping up as you arrive, which clears the way for the big one: rewriting the real-time price feeds as multi-threaded code against a new data provider. If you're strong on C you could pick that up early. If it's more historic for you, they'll bed you in on something else first and come back to it. In many respects the project work you’ll be given will be shaped around your strengths.
One thing to be straight about: this team owns running the service, not just writing it. There's a separate infrastructure team handling the hardware and networking, but keeping the software up and stable sits with the development team. If you want to write code and hand it over a wall, this isn't the one. If build it, ship it, own it is how you like to work, it's a strong fit.
Employee Benefits
- Fully remote across the UK
- Workplace BUPA private health scheme at heavily reduced cost through payroll
- Company-funded socials several times a year, summer and Christmas parties, all on the company
Urgent role, please Apply ASAP for success!
Senior Developer | Java or C# & C/C | Financial Data Software House
