Custom software development in London
Blueprint Two was meant to give the London insurance market a shared digital backbone. Lloyd's has since moved away from it, so managing agents, brokers and coverholders are left to fix their own workflows, and most of those workflows still run on spreadsheets, shared inboxes and a policy administration system nobody wants to touch. The same pattern shows up in the City's professional services firms, where a critical process lives in one person's workbook.
Custom software is the answer when the process is genuinely yours and no product fits it. We build internal tools that replace the spreadsheet without replacing the people who understand it: bordereaux intake, referral queues, approvals with a record of who signed off, and integrations into the systems you already have. If a product on the market covers most of the need, we will say so before we write anything.
Financial services drive more of London's software demand than any other sector. Payments companies, challenger banks, wealth platforms and brokers need ledgers that reconcile, APIs that stay correct when a partner retries, and apps customers trust with their money. Most of them reached the market fast, which was the right call at the time, and now run systems built for launch rather than for the size they have become. The work is making those systems dependable without stopping the business that runs on them.
Insurance is its own case. The specialty insurers, managing agents and brokers around Lloyd's still run much of their work on ageing policy administration platforms and spreadsheets that travel between firms by email. Lloyd's has moved away from Blueprint Two, the market-wide programme that was meant to digitise placement and claims, so each firm is modernising its own systems one integration at a time. The City's law firms and consultancies sit alongside them, holding decades of documents and few ways to search them by meaning.
Media, retail and the public sector bring different problems. Publishers run subscriptions, paywalls and content systems that have to hold up on a busy news day. Direct-to-consumer brands outgrow their first shop as they start selling into Europe and the US. Suppliers to councils and NHS bodies build services that have to work for every resident, including people using a keyboard or a screen reader. Hiring is the common constraint. ITJobsWatch puts the median advertised salary for a software engineer in London at £98,750 over the six months to September 2026, and banks, fintechs and the large technology firms compete for the same people.
Working with us from London is straightforward. Four hours of every working day overlap with yours, set across your morning, so stand-up, code review and the decisions that follow happen live. You talk to the engineer who writes the code, in your own Slack, GitHub and Linear. The rest of the day moves forward in pull requests you can read at your desk, with runbooks and architecture notes written as the work goes.
We are the right fit when you have a defined piece of work and need senior engineers on it this month rather than next quarter. Start with a fixed-price two-week piece and judge us on what ships. We add capacity while a London hire is still in progress, and we work white-label under your name for agencies.
Four ways this arrives.
Approvals, schedules or stock, tracked in a shared file with colour codes only one person understands. We turn it into an application with proper records, permissions and history, so you can see who changed what and when, and nobody works from an old copy.
Staff copy data from one system into another by hand, and the two slowly drift apart. We connect them through their APIs, clean up the data where it crosses over, and alert someone when a sync fails instead of letting it fail quietly.
The numbers exist, spread across exports and inboxes, and someone assembles a report by hand every Monday. We pull them into one place, build the dashboard the people making decisions will actually open, and check it is current rather than trusting the job that feeds it.
A legacy application still runs the business and every change to it is a risk. We map what it really does, move it piece by piece onto something maintainable, and keep both running until the last piece has landed. No weekend cut-over.
A facilities operations platform for a healthcare estate, built so supervisors can see what is overdue and what keeps coming back without exporting spreadsheets by hand.
Read the write-up →Asked by London teams.
How do you work with teams in London?+
Four hours of every working day overlap with yours, set across your London morning, so stand-up and code review happen live. We join your calls and work in your tools: Slack, GitHub and Linear. You talk directly to the engineer who writes the code. Outside the overlap, the work carries on in pull requests you can read at your desk, and runbooks and architecture notes are written as we go.
Do you build for London fintechs and insurers?+
Yes. For payments companies, challenger banks and wealth platforms we build ledgers that reconcile, webhook handling that stays correct when a provider retries, and React Native apps with biometric sign-in and step-up checks for risky payments. For insurers, managing agents and brokers around Lloyd's we replace spreadsheet workflows with internal tools: bordereaux intake, referral queues and approvals, connected to the policy systems you already run.
How does your rate compare to hiring in London?+
ITJobsWatch puts the median advertised salary for a software engineer in London at roughly £99,000. Our published rate is $35/hour, with a $5,000 minimum engagement. There is no recruiting time and no employment overhead, and we can start within days of the first call. Most clients begin with a fixed-price two-week piece at $2,800, so you judge us on working code before committing to more.
Can you work white-label for a London agency?+
Yes. London agencies bring us in when a client project needs more senior backend, mobile or infrastructure work than the team has free. We work under your name, in your repositories and your client's tools, and you stay the face of the project. The NDA comes before specifics, the code belongs to the client from the first commit, and runbooks and architecture notes are written as we go.
Why not buy an off-the-shelf tool?+
Often you should, and we will tell you when. If a product already does most of what you need, configuring it is cheaper than building. Custom software earns its cost when the process is how you compete, when you pay for several tools to do one job badly, or when the workarounds cost more staff time than the software would.
Can you work with the systems we already have?+
That is usually the job. Most internal tools are valuable because of what they connect to: an ERP, a work-order system, a CRM, a finance package. If it has an API, we integrate with it. If all it offers is a nightly export, we can work with that too, and we will tell you how fresh the data can honestly be.
How do you find out what we actually need?+
By talking to the people who do the work, not only the people who asked for the tool. We watch the spreadsheet being used, collect the edge cases everyone handles from memory, and write the process down before we build anything. The first release covers the core of it; the exceptions follow once people are using it.
What happens to our old data?+
It comes with you. We migrate it, check the counts and totals against the source, and keep the old system or spreadsheet readable until your team is confident nothing was lost. Where the old data is inconsistent, we show you the records that do not fit rather than quietly guessing what they meant.
Who looks after it once it is live?+
You choose. We can stay on at our hourly rate for changes and fixes, or hand it to your own team with runbooks, architecture notes and a recorded walkthrough. Internal tools change as the business changes, so we build them to be changed by someone other than us.