Top 10 Software Development Companies in the UK 2026

Software has become the backbone of most UK businesses. It isn’t a side project anymore. It is the business.

Banks, the NHS, retailers and insurers all rely on software to serve their customers, and the companies that build it have been thriving. Kainos, the Belfast-based digital services group, saw revenue rise 17% to £431.1 million in the year to March 2026. Made Tech, whose business focuses heavily on the public sector, grew revenue 27% to £58.9 million in the year to May 2026.

That growth tells you something. Demand for experienced engineering partners is strong, and some are far better than others. A good partner ships secure, maintainable software on time. A poor one leaves you with a half-finished product and a codebase nobody wants to touch.

So who should you trust with your next build? We looked at the companies that keep appearing in independent rankings, checked their latest results and client work, and narrowed the field down. This guide looks at the top 10 software development companies in the UK for 2026, from listed giants to focused specialists.

Why Businesses Work With Software Development Companies in the UK

Access to Senior Engineering Talent

Building your own team of architects, developers, testers and designers can take a long time and cost a lot. Software development companies in the UK give you all those skills when you need them, and you only pay for the time you use.

Faster Delivery With Less Risk

Established firms have tried and tested processes they can apply to your project. That means fewer surprises, clearer milestones and a better chance of getting your software live on time.

Specialist Knowledge of Regulated Sectors

Many UK developers are used to working with government, healthcare and financial services clients. They understand security accreditations, data protection rules and public sector standards, which saves you from learning those lessons the hard way.

Long-Term Support

Your software will still need support after it’s developed. The best partners stay on to fix issues, add features and keep your platform secure as it grows.

Top 10 Software Development Companies in the UK at a Glance

Top 10 Software Development Companies in the UK (2026)

We’ve ranked the top 10 below, with what each company does best and who it suits.

1. Kainos

Kainos was founded in 1986 and is based in Belfast. It’s listed on the London Stock Exchange and had 3,475 employees and contractors across 17 countries at the end of its 2026 financial year. The business has three parts: Digital Services, Workday Services and Workday Products.

In the year to 31 March 2026, Kainos made revenue of £431.1 million, an increase of 17% on the previous year. Its Digital Services division, the custom software arm, grew revenue 23% to £241.7 million. Clients include the Home Office, the Department for Transport, NHS England, the Ministry of Defence and Rolls-Royce. If you need a large partner with public sector experience and a long track record, few software development companies in the UK match it.

Key Kainos Solutions
✔ Digital service design and build for government
✔ Cloud migration and legacy modernization
✔ Workday implementation and testing products
✔ AI and data services

Best for: Government departments and large enterprises running complex, large-scale programs.

2. Endava

Endava was founded in 2000 and is based in London, with delivery centers in Europe, the Americas and Asia Pacific. It’s listed on the New York Stock Exchange and had 11,225 employees as of 31 March 2026. Endava specializes in software engineering, data and AI, product design and automation.

The UK accounted for 33% of Endava’s revenue in its third fiscal quarter of 2026. It has had a tougher year, with fiscal 2026 revenue guided at £721.8 million to £725.8 million, a decline of 5% to 6% at constant currency. Even so, its size and publicly disclosed work for payments firms such as Mastercard and Worldpay keep it on the shortlist for large financial services builds.

Key Endava Solutions
✔ Custom enterprise software engineering
✔ Payments and banking platforms
✔ Data, AI and intelligent automation
✔ Product and experience design

Best for: Large banks, payments firms and enterprises that need a deep global delivery bench.

3. BJSS (part of CGI)

BJSS was founded in 1993 and is based in Leeds. It’s one of the most recognizable names in UK enterprise engineering and had about 2,400 consultants and professionals when global IT group CGI agreed to acquire it in January 2025. The deal was expected to complete in February 2025, and BJSS now operates as part of CGI.

BJSS has years of experience building large-scale software systems and solving complex technology problems. It’s now backed by a much bigger global group. If you need serious engineering depth without going straight to an offshore model, it’s a natural candidate.

Key BJSS Solutions
✔ Enterprise software engineering
✔ Cloud and platform engineering
✔ Data and AI delivery
✔ Testing and quality engineering

Best for: Enterprises and public bodies that want UK-based engineering teams at scale.

4. Softwire

Softwire was founded in 2000 and is based in London, with offices in Manchester and Cambridge. It’s an independent technology consultancy that provides bespoke software, data platforms and AI transformation to sectors including government, energy, financial services and insurance.

Softwire recently helped Moorfields consolidate its data into an AI-ready cloud platform, securely supplied energy-sector data for Elexon and worked with Channel 5 to improve the My5 user experience. It also helped the UK’s voter registration service scale and stay secure. Softwire holds Cyber Essentials Plus, is a Crown Commercial Service supplier and an AWS Advanced Tier Services partner, and has been named in the Financial Times list of the UK’s leading management consultancies every year from 2021 to 2026.

Key Softwire Solutions
✔ Bespoke software development
✔ AI transformation
✔ Data strategy and platforms
✔ Digital product and customer experience

Best for: Organizations that want a trusted, independent partner for complex custom builds.

5. Made Tech

Made Tech is based in London and listed on AIM. It provides digital, data and technology services to the UK public sector, including central government, health and local government. Its offerings include digital service delivery, legacy application transformation, data, cloud and engineering, and a software product for housing repairs.

Made Tech has had a great 2026. Revenue for the year to 31 May 2026 rose 27% to £58.9 million, ahead of upgraded market expectations, and the company won a £19 million contract with the Government Digital Service. If you’re looking for one of the most focused public sector specialists among software development companies in the UK, Made Tech belongs on your list.

Key Made Tech Solutions
✔ Digital public service delivery
✔ Legacy application transformation
✔ Data, cloud and engineering
✔ Housing repair SaaS for local government

Best for: Central government, NHS bodies and councils modernizing public services.

6. Apadmi

Apadmi was set up in 2009 and is based at MediaCityUK in Manchester. It now has more than 450 mobile specialists and offices in the UK, the Netherlands, Poland, the US and Sri Lanka. Mobile apps and digital products for major consumer brands are its specialty.

Apadmi made £30 million in revenue in the year to March 2025, a 32% increase on the previous year, and in January 2026 it set a 20% growth target for its 2026 financial year. Recent clients include Yeo Valley Organic, Topps Tiles and Matalan, and its wider client list includes Domino’s, Co-op, the NHS, Gulf Air and the BBC.

Key Apadmi Solutions
✔ iOS and Android app development
✔ Digital product strategy and design
✔ Cross-platform development
✔ App support and optimization

Best for: Consumer brands and retailers whose customers live on mobile.

7. Waracle

Waracle started as a spin-out from Abertay University. It’s based in Dundee and also has offices in Edinburgh, Glasgow and London. It creates digital products for clients in sectors including banking, insurance, energy and healthcare.

In 2024, Waracle acquired Glasgow agency Screenmedia, giving the combined business around 200 people. Its clients have included Lloyds Banking Group, Royal London, ScottishPower, Roche and Imperial College London. That mix of banking and health work makes it one of the strongest specialists outside London.

Key Waracle Solutions
✔ Mobile and web product development
✔ Digital products for regulated industries
✔ UX and service design
✔ Product support and evolution

Best for: Banks, insurers, energy firms and health organizations in Scotland and beyond.

8. One Beyond

One Beyond, previously known as DCSL GuideSmiths, was established in 1994. It’s based in Farnborough, Hampshire, with nearshore teams in Spain, and has more than 200 staff. It has been owned by Queen’s Park Equity since 2020.

The company provides custom software, web and mobile applications, ERP and CRM systems, systems integration, AI consulting and modernization of existing software. It works with organizations of all sizes, from small and mid-sized firms to large enterprises, the public sector and charities. More than three decades in business make it a steady option for companies that want a UK-led team with a cost-efficient delivery model.

Key One Beyond Solutions
✔ Custom software development
✔ Legacy software modernization
✔ Systems integration and ERP/CRM
✔ AI consulting and data analytics

Best for: Mid-sized firms and enterprises replacing or modernizing business systems.

9. GoodCore Software

GoodCore Software was founded in 2005 and is based in Croydon, south London. It builds custom software, SaaS products, web and mobile apps and business automation systems, mainly for small and medium-sized businesses.

GoodCore appears on several 2026 shortlists of UK developers, often as a pick for smaller companies that need a dependable build partner. It has built software for clients in finance, healthcare, education and sport. If you’re after a hands-on partner without enterprise-level overheads, it’s one of the more practical choices among software development companies in the UK.

Key GoodCore Solutions
✔ Bespoke software development
✔ SaaS and MVP development
✔ Web portals and mobile apps
✔ Digital transformation consulting

Best for: SMEs that need custom software on a sensible budget.

10. Tech Alchemy

Tech Alchemy is a software design and development studio on Redchurch Street in east London, with 101 to 200 people. It builds digital products for startups and high-growth businesses and specializes in product design, cross-platform apps, AI and blockchain.

The studio takes on only a limited number of projects each year, which lets it give each one the time it needs. Client projects it has worked on have gone on to raise more than £75 million, and its work has been featured by Apple, Amazon and the BBC. It appears across several 2026 rankings of UK developers.

Key Tech Alchemy Solutions
✔ Product design and MVP builds
✔ Cross-platform mobile and web apps
✔ AI and data features
✔ Blockchain development

Best for: Funded startups that want a close, design-led build partner.

How to Choose the Right Software Development Partner in the UK

Match the Firm to the Size of the Job

If you need a listed company with years of experience on large, multi-year programs, Kainos or Endava are probably your best bets. A startup or smaller business may get more attention and a faster start from a smaller studio. Look for a partner whose past projects look like yours.

Check Sector Experience

Ask for case studies that match your industry. A firm that has already built software for NHS bodies or banks will know the rules and help you avoid common pitfalls.

Look at Security and Accreditations

Check that the company holds the right certifications, such as Cyber Essentials Plus and ISO 27001, especially if you handle personal or financial data. Public sector buyers should also check whether the firm is on Crown Commercial Service frameworks.

Understand the Delivery Model

Find out where the developers are based. Some firms deliver fully from the UK, while others use nearshore or offshore teams. Both can work well, but you need to understand the cost and communication trade-offs.

Agree on Support After Launch

Ask who maintains your software once it’s live, how quickly bugs get fixed and what new features will cost. A clear support plan saves time and money later.

Frequently Asked Questions About Software Development Companies in the UK

Which is the best software development company in the UK?

There’s no single best choice for everyone. Kainos and Endava lead on scale, Made Tech specializes in the public sector, Apadmi and Waracle are strong on apps, and GoodCore and Tech Alchemy suit smaller budgets and startups. The right pick depends on your project, sector and budget.

How much does custom software cost in the UK?

Prices vary widely depending on scope, team size and delivery model. A simple MVP from a small studio costs far less than a multi-year enterprise program. Get detailed quotes from two or three software development companies in the UK and compare what’s included.

How long does a software project take?

A focused MVP can often be built within a few months, while large enterprise platforms can run for a year or more. Many UK firms work in agile sprints, so you’ll see working software sooner.

Should I choose a UK-based or offshore developer?

A UK-based team is easier to meet face to face and is likely to understand local regulation better. Offshore or nearshore developers can help reduce costs. Many firms on this list combine both, so ask exactly who will work on your project.

Conclusion

The UK has a deep pool of engineering talent, and the companies on this list show its range, from large listed groups to focused studios that take on only a handful of projects a year.

Decide on your goals, budget and sector first. Then shortlist two or three of these software development companies in the UK and talk to them. The right partner won’t just write code. It will help you build software your business can rely on for years.