Fintech App Development in the UK: Top Companies to Explore

London still pulls in fintech founders from everywhere, but 2026 hasn't been an easy year. KPMG's Pulse of Fintech report puts UK fintech investment at £1.8bn in the first half of 2026. That's the lowest six months since the report began in 2016. A year earlier the figure was £5bn. Much of the money moved towards AI, with AI-related fintechs taking £445m across 79 deals, about a quarter of the total.

Customers haven't slowed down, though. Open Banking Limited counted 40.16 million Open Banking payments in June alone, and the system has now passed one billion payments overall. Demand is there. Investors are just pickier, so your app has to work properly from day one.

What to Look for in a Fintech App Development Company UK

A good fintech app development company UK businesses can trust usually ticks these boxes:

• Real fintech work. Ask to see live apps in payments, lending or banking, not just a nice-looking portfolio.
• Regulatory know-how. FCA rules, PSD2, Strong Customer Authentication and UK GDPR should be familiar territory.
• Open Banking experience. Plenty of agencies have never connected to a bank API. Ask.
• Named senior people. Find out who will actually build your product.
• Support after launch. Financial apps need patches and compliance updates long after release.

Sounds obvious? Plenty of buyers still skip half of this list.

Top Fintech App Development Companies in the UK

Here are six firms with a UK presence to put on your shortlist. We've kept to what each company says about itself publicly, so check their latest case studies before you decide.

1. Dotsquares

Established in 2002 Dotsquares with offices in London and Brighton and locations in the US Australia UAE, Europe, and India, has a 1,000+ team based in development centres in Jaipur, India. In 2019, in London, the company opened a branch office for further expansion in the fintech space. CMMI Level 3 approved, working with short agile sprints providing tangible results, Dotsquares is combining onshore project management with offshore build capacity to keep the costs reasonable, and providing a suitable partner for startup and scaleup sized businesses looking to have the whole project solved (design, build, and support) by one team.

2. Apadmi

Based in Manchester and London, and mobile-first. It has worked with retail banking and consumer finance clients. Worth a call if native iOS and Android quality is your top priority.

3. Brightec

A Brighton agency that works only from the UK, with fintech and insurance clients. The team is small, so you talk to the engineers directly.

4. Endava

London-headquartered and listed, with a payments and banking practice. It suits larger programmes that need plenty of engineering capacity.

5. Equal Experts

A London consultancy built around senior practitioners. Think platform engineering, DevOps and data work, which makes it a match for modernising older systems.

6. Capco

A London fintech-only consultancy, now part of Wipro. It covers strategy, regulation and delivery together, so it's better for banks than for a small MVP.

Core Services Offered by Fintech App Developers UK

Most fintech app developers UK firms cover the same ground:

• Mobile banking and neobank apps
• Payments, wallets and Open Banking integrations
• Lending platforms and credit scoring
• Wealth and investment apps
• KYC, AML and fraud tools

If you need a wider build, take a look at Dotsquares' Mobile App development services. For finance-specific projects, the team also offers Fintech App Development Services.

How to Build a Secure Fintech App

Secure fintech app development can't be a last-minute check. It starts in sprint one. At a minimum, expect:

• Encryption for data in transit and at rest
• Biometric or multi-factor login that meets SCA rules
• Locked-down APIs with tokens and rate limits
• Penetration tests before launch and after big releases
• Real-time transaction monitoring

That last point matters more than it used to. APP fraud liability is now split 50:50 between the sending and receiving firms, so watching incoming payments counts as much as outgoing ones.

The rules keep moving as well. Tighter safeguarding requirements for payment and e-money firms started on 7 May 2026, and the FCA's crypto authorisation window opened on 30 September 2026. Ask any partner how they track changes like these.

How to Choose the Right Fintech Partner

Try this order:

1. Write down your scope and the licences you'll need.
2. Ask for two UK fintech references from the last two years, and call them.
3. Ask for their ISO 27001 certificate.
4. Find out who the lead engineer is.
5. Pay for a short discovery phase before committing to the full build.

That last step is cheap insurance. Two weeks of discovery shows you how a team really works.

Typical Cost and Timeline

The cost of quotes can be huge. An UK agency guide says a basic fintech MVP begins at about  £25,000. One estimates production-ready builds at  £80,000 and higher, rising beyond  £500,000 once ready-made compliance solutions are factored in. Use these as agency approximations, not prices. The median MVP takes four to six months to produce. Enterprise-level platforms can take nine to 14. Pricing should be put in writing after the discovery phase.

Final Thoughts

Money will be thinner in 2026. UK consumers are still demanding safe and fast financial apps. Partner on proof, not promise. We can help talk through your idea with the team here at Dotsquares.

FAQs

How long does fintech app development take? 

An MVP usually takes four to six months. Larger platforms take longer.

Which rules apply to a UK fintech app? 

That depends on what it does, but FCA rules, PSD2, SCA, UK GDPR and AML checks come up most often.

Should I pick a UK-only firm or one with offshore teams? 

UK-only firms usually charge more per hour. Hybrid firms cost less and still give you a UK contract and a local point of contact.