Leaf through the premier custom software development companies in London that customize, maintain and/or build high-quality solutions, mobile applications and more. Filter listings by reviews, pricing, team size to find the ideal team for your project requirements and budget.
Best London Software Development Firm Rankings
7 Companies-Rankings updated: September 12, 2026
DesignRush evaluates each agency using expert assessment and client feedback to inform your choices. Some featured agencies have paid placements.
Solving complex problems with design and technology since 2005.
We create digital products that streamline operations, grow your audience, and boost business success. Partnering with visionary brands, we transform ideas into impactful solutions using innovative design and technology. Discover how our Software Development expertise can elevate your next project...
Top Services:
Web Development
Web Design
Mobile App Development
UI/UX Design
Software Development
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Location
London, United Kingdom
Number of Employees
250 - 499
Minimal Budget
$50,000 & Up
Portfolios Count
24 Projects Listed
Infinum Services
Web Development
Web Design
Mobile App Development
UI/UX Design
Software Development
Cloud Consulting
DevOps Consulting
Cybersecurity
Staff Augmentation
IoT
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
Porsche
Nike
CITI
Royal Caribbean
Philips
Bayer
T-Mobile
P&G
Universal
Virgin Mobile
Data sourced from the agency's DesignRush profile
Infinum Reviews & Testimonials
Matic Debelak Management Board Member at Modra zavarovalnica, d.d.
5.0★
Mobile App Development Review from Matic Debelak
Workstream 1: research and product strategyWorkstream 2: ETP release Technology : Vendor use Flutter framework, which allows one programming language and one codebase to create two different apps (for iOS and Android). Clearly defined roles and responsibilities, communication is clearly and respectfully, very effective project methodology, trying to understand every time how their activities fits into mission of Modra zavarovalnica, respect each member of team, etc.
Claus-Peter Mueller Managing Director at NLB Lease&GO doo
5.0★
Software Development Review from Claus-Peter Mueller
We have engaged Infinum to develop an app that would digitalise our leasing process. From creating the initial offer through the necessary financing application and client identification to the final signature – all the steps required to successfully lease a vehicle or other object can be performed in-app, freeing the users of friction and having to deal with tedious paperwork.The app itself in the background has 30+ integrations, while keeping a seamless and quick to follow process on the front for our users. That application is in production and Infinum is responsible for maintaining it and further improving. After the initial development, we have additionally expanded our scope from vehicles to other equipment. They have also developed a Leasing widget, product which enables quick financing model while purchasing a vehicle online on car seller marketplace pages. At this moment, we are still in partnership with Infinum, and their engagement is mainly focused on localising the app to other countries and supporting us in our further business expansion. The work performed was done in Ruby on Rails and React technology, with support of other services.
Anonymous VP of Marketing at SaaS Company
5.0★
Web Design Review from Anonymous
Thanks to Infinum's website refresh, the client has seen an almost 100% improvement in their website's conversion rates. The team excels at project management, using the client's own proprietary tool and also Figma very well. Their proficiency in design, delivery, and client relations stands out.
Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
We build mobile apps, web platforms & AI workflows for organisations doing good in the world.
3 Sided Cube is a global mobile app and digital development company with a passion for Tech For Good, championing the genius over the generic to build life-saving, life-changing digital solutions...
Top Services:
Mobile App Development
Software Development
Web Development
AI Development
Digital Services
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Location
London, United Kingdom
Number of Employees
50 - 99
Average Hourly Rate
$150/hr
Minimal Budget
$50,000 & Up
Portfolios Count
5 Projects Listed
3 Sided Cube Services
Mobile App Development
Software Development
Web Development
AI Development
Digital Services
UI/UX Design
Digital Strategy
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
American Red Cross
Surfers Against Sewage
Omaze
Vodafone | Glastonbury Festival
LUSH
Global Forest Watch
The World Resources Institute
University Of Bristol
GDPC
Wonderbly
Data sourced from the agency's DesignRush profile
3 Sided Cube Reviews & Testimonials
Si Muddell Review from Google
4.0★
Si Muddell's Review Sourced from Google
Fantastically positive and driven team who on every interaction you just know care deeply about a) what they do b) what they deliver and c) ultimately the experience the end user will have.Hugely impressed with their personal, creative and energy driven approach at the pitch stage, I commissioned 3SC to help us better scope an app. Their task was to take an in-house developed app prototype, and turn it into a fully fledged technical specification with user stories, MoSCoW prioritisation, costs, and an updated look and feel; all done with audience need at the heart.Myself and the wider team have nothing but very good things to say about 3SC. When reflecting on an agency to work with, loads say they can do it, some can actually do what they say they can do, even less do it in the spirit of real partnership and mutually respect/drive. 3SC do all of these excellently. I highly recommend them.
Oliver Morrison Review from Google
5.0★
Oliver Morrison's Review Sourced from Google
A passionate team of insanely talented experts, producing industry leading technology for good causes. Highly recommend.
Kev Borrill Review from Google
5.0★
Kev Borrill's Review Sourced from Google
Great Digital agency with a passion for making great mobile apps in the Tech for good industry
Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
A global AI-first software firm focused on transforming tech challenges into business successes
Sombra is a global AI-first software development and AI consulting partner. With 400+ experts across the US, Europe, Latin America, Canada, India, and the Middle East, we design, build, and deliver IT solutions in AI, financial services, healthcare, e-commerce, energy, logistics, and...
Top Services:
AI Development
Software Development
Mobile App Development
Cloud Consulting
Big Data Analytics
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Location
London, United Kingdom
Number of Employees
250 - 499
Average Hourly Rate
$50/hr
Minimal Budget
$50,000 & Up
Portfolios Count
7 Projects Listed
Sombra Services
AI Development
Software Development
Mobile App Development
Cloud Consulting
Big Data Analytics
Managed Services
DevOps Consulting
IT Services
Staff Augmentation
Cybersecurity
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
ITC Complience
International Farming
Studio Ninja
Wineshipping
Datacubed Health
Waterford.org
On Location
Wifinity
Data sourced from the agency's DesignRush profile
Sombra Reviews & Testimonials
Orysia Marukhno Review from Google
5.0★
Orysia Marukhno's Review Sourced from Google
A wonderful place for work.The atmosphere is very cozy and comfortable. People and friendly and helpful.Guys, you are great.
Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
Creating Mobile Apps That Digitally Transform Business
Sugar Rush is a Mobile App Agency that provides mobile app development services to clients in the UK, Ireland, Europe, and the US. They have received recognition as the "UK App Agency of the Year" and have won 'App of The Year' awards for three consecutive years in Northern Ireland...
Top Services:
Mobile App Development
Web Design
Software Development
VR/AR
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Location
London, United Kingdom
Number of Employees
Under 49
Minimal Budget
$50,000 & Up
Portfolios Count
1 Project Listed
Sugar Rush Services
Mobile App Development
Web Design
Software Development
VR/AR
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
BUNZL
BBC
Radio Times
TopGear
Game of Thrones
Stryker
Olympus
Angling Direct
Data sourced from the agency's DesignRush profile
Sugar Rush Reviews & Testimonials
Dean Lyttle Review from Google
5.0★
Dean Lyttle's Review Sourced from Google
On behalf of AES Global Ltd -Moving our app development locally was a key focus for us in 2020. After extensive research into local companies and speaking to them all Ali, Danielle and the whole team at Sugar Rush most definitely came out on top.Their company culture and attention to detail was what caught our eye first which was followed closely on their project management skills.We are currently working on our 4th project together and i am still amazed with their dedication to learn our product inside out so they truly understand how it should function with the app and provide new ideas and better flows than what we had before.We have dealt with a large number of different colleagues within Sugar Rush and every single one of them are a credit to the company and provide a brilliant customer experience.Here is to the last 2 year partnership with many more years to follow. Thank you Sugar Rush for your partnership and helping to modernise and optimise our app platform.
Reviews verified by DesignRush and sourced from the agency's profile View All Reviews