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
6 Companies-Rankings updated: August 19, 2026
All agencies on DesignRush undergo evaluation based on professional expertise and verified client reviews. Please note that certain placements are paid partnerships.
Custom Product & Software Development Focused On Your Success
Altar.io is dedicated to building user-focused digital solutions with a co-founder mindset. Our unparalleled skills in software creation ensure rapid, lean development and transparent collaboration. We deliver precise, market-ready products that empower clients to innovate and succeed...
Location
London, United Kingdom
Number of Employees
Under 49
Average Hourly Rate
$100/hr
Minimal Budget
$10,000 - $25,000
Portfolios Count
9 Projects Listed
Altar.io Services
Software Development
Mobile App Development
AI Development
Product Design
UI/UX Design
IT Services
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
Loan Lynx
Movie Me!
Krepling
Ovvio
Fave
Legartis
McKinsey & Co
Audio Test Kitchen
QuartalFS
Apiax
Data sourced from the agency's DesignRush profile
Altar.io Reviews & Testimonials
Dudley Gould ACA Founder at Circit
4.8★
Fintech Review from Dudley Gould ACA
What set's Alatar.io apart is their team. They are not only experienced product managers, software developers and designers but have a lot of experience building and helping startups. Whilst Altar.io is responsible for all of the tech development, a huge amount of my time with the Altar.io team is actually spent working on strategy, marketing and business development. I highly recommend working with Altar.io.
Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
Ocean View Games is a London-based Unity game development studio led by former Jagex engineers. We specialize in co-development and staff augmentation, mobile porting and performance optimization, multiplayer and networking engineering, and educational game development. Our team has shipped titles for Jagex...
Location
London, United Kingdom
Number of Employees
Under 49
Minimal Budget
$10,000 - $25,000
Portfolios Count
1 Project Listed
Ocean View Games Services
Software Development
Mobile App Development
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
Domi Online
Nova Blast
Pocket Factory
The Language Conservancy
Data sourced from the agency's DesignRush profile
Ocean View Games Reviews & Testimonials
Harley Swann Lead Developer / Developer at Domi Game Studios
5.0★
Software Development Review from Harley Swann
We partnered with Ocean View Games to support development of Domi Online, a large-scale MMORPG requiring strong performance optimization and scalable multiplayer systems.Acting as our Lead Engineering partner, they took ownership of core gameplay systems, multiplayer networking, and technical scalability. Leveraging their experience from Jagex working on RuneScape, they designed systems capable of supporting high concurrent player counts and complex in-game interactions.Their work significantly improved network performance, stability, and deployment reliability, helping us run smoother playtests and build a production-ready multiplayer stack.Project management was excellent throughout, with clear milestones, reliable delivery, and strong communication. Overall, Ocean View Games delivered outstanding technical expertise and remain a trusted engineering partner!
Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
Bespoke software solutions for SMEs to work smarter and win more.
At Red Eagle Tech we provide bespoke software development services for small and medium enterprises. Our solutions help SMEs work smarter, win more and dominate their industry. Friendly London-based team, fixed-price projects, no contract tie-ins...
Location
London, United Kingdom
Number of Employees
Under 49
Average Hourly Rate
$165/hr
Minimal Budget
Under $1,000
Red Eagle Tech Services
Software Development
Mobile App Development
IT Services
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
NHM
SOS Synergy
Jess Ashby Art
Data sourced from the agency's DesignRush profile
Red Eagle Tech Reviews & Testimonials
Veronica Korczak Review from Google
5.0★
Veronica Korczak's Review Sourced from Google
Whilst integrity and veracity are in short supply these days, Red Eagle Tech has it in spades. You can trust these guys. I bought my Microsoft 365 licences from them, and they went out of their way to make the transactions as smooth as possible.
Jeff Stropky Review from Google
5.0★
Jeff Stropky's Review Sourced from Google
Best business I’ve ever dealt with, these guys know their stuff. 10/10 service, I couldn’t be happier.
Ahjaimee Review from Google
5.0★
Ahjaimee's Review Sourced from Google
Working with Kat, Stef, and the whole team at Red Eagle Tech has been a brilliant experience from start to finish. They’ve supported us across multiple digital projects, and every time they’ve delivered solutions that genuinely make our business more efficient while also saving us money.Whenever we bring them a new idea, they approach it with total openness, fresh thinking, and a real understanding of what we’re trying to achieve. They grasp the assignment straight away and always offer smart suggestions that strengthen the final result.Everything with them is transparent, communication, process, and especially pricing. You can tell they know exactly what they’re doing, and their expertise shows in how smoothly each project runs. On top of that, they’re incredibly easy to work with, which makes the whole experience even better.
Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
Scale faster with high-performing software and digital products
FiftyFive Tech UK is a global, remote-first software development company, powered by a network of highly skilled senior engineers. We deliver cost-effective, high-quality solutions at speed whether you need a fully outsourced team, a tailored software project, or help launching your first MVP. Our team...
Location
London, United Kingdom
Number of Employees
100 - 249
Average Hourly Rate
$25/hr
Minimal Budget
$10,000 - $25,000
FiftyFive Technologies UK Services
Software Development
Mobile App Development
AI Development
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
Qopla
amilis
Aposto
Viable
The Training Marketplace
Data sourced from the agency's DesignRush profile
FiftyFive Technologies UK Reviews & Testimonials
TRAINING MARKETPLACE THE Review from Google
5.0★
TRAINING MARKETPLACE THE's Review Sourced from Google
We are really pleased with the quality of the development team. They were quick to learn our product, are extremely responsive and very productive. Add to that they provide great ideas and work flexibly (when we change priorities) we could not ask much more. Miles better than our previous experience.
Yasmin Baba Review from Google
5.0★
Yasmin Baba's Review Sourced from Google
As an early stage start-up founder, I loved the flexibility & support that 55Tech gave me as we developed a whole app from scratch. Great developers & great management team! Would recommend to anyone looking for a reliable developer agency.
Ross Hidge Review from Google
5.0★
Ross Hidge's Review Sourced from Google
Max and Jonny have been brilliant from start to finish of the process, from signing the contracts up to now where we are beginning to see first iterations of the product. The development team have worked meticulously to make sure the product specification was achievable for this rather complex project and have exceeded expecations in some aspects of development. We are now mid/late way through development and the work has been fantastic throughout with the MVP looking like it will surpass my expecations.
Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
Blockproof is a premier blockchain development and consulting agency dedicated to navigating complex business challenges. The firm provides tailored solutions for investment, service integration, and new project development, ensuring clients stay ahead in the evolving blockchain ecosystem. Blockproof's...
Location
London, United Kingdom
Number of Employees
Under 49
Average Hourly Rate
$300/hr
Minimal Budget
$25,000 - $50,000
blockproof. Services
Blockchain
Software Development
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts