Top 100 C# Developers in the United Kingdom
September 2023Looking for a top C Sharp software development company in the United Kingdom?
The programming language C Sharp (C#), is general-purpose and used for web and mobile apps. It has a number of advantages: It's object-oriented, has automatic garbage collection, functions across platforms, has backward compatibility, and integrates well with other platforms and services.
To assist you in your search for a partner, we’ve compiled this list of the top C# developers in United Kingdom. Browse descriptions, feedback, and awards to find which can best suit your company’s needs.
List of the Best United Kingdom C Sharp (C#) Software Development Companies
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1
- $50,000+
- 250 - 999 employees
- Farnborough, United Kingdom
One Beyond is a bespoke software development and digital transformation company headquartered in London with additional engineering centers in Madrid (Spain), Budapest & Szeged (Hungary) and Bucharest (Romania). Across international locations, they have a team of more than 350 individuals providing custom software, web and mobile application development and large- scale digital transformation to a diverse clientele.They support large established businesses, nonprofits, government organizations, and VC-funded startups
Clients
- Smith & Nephew
- GAIL's Bakery
- Costa Express
- Pearson
Industries
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One Beyond (formerly DCSL GuideSmiths) developed a cloud-based web app for a contract company. The digital tool lets users define large construction projects and streamlines the procurement process for contractors.
“Whenever there was a problem, they helped us come up with a solution.”
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2
- $25,000+
- 50 - 249 employees
- Croydon, United Kingdom
Founded in 2005 and headquartered in Croydon, UK, GoodCore Software specializes in bespoke software development. WIth a team of about 50 employees, the company offers web and mobile app development to startups and established businesses alike. Engagement options include fixed- cost and dedicated development teams.
Clients
- Printed Music Licensing
- Weight Loss Resources
- GC Business Finance
- XTracked Deliveries
Industries
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GoodCore developed a SaaS application for managing briefing programs and events for Fortune 100 companies. The team coded in React and Laravel for creating a web-based application. The application helped automate and streamline the management of corporate events, briefing programs and meetings.
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3
- $10,000+
- 50 - 249 employees
- London, United Kingdom
Influential Software is a software development firm in London, United Kingdom; Maidstone, United Kingdom and Glasgow, United Kingdom. The firm focuses on custom software development, web development, BI & big data consulting & SI, IT managed services, and more and has a midsize team.The firm was launched in 1993.
Clients
- Deloitte
- American Express
- London Stock Exchange
- Pret a Manger
Industries
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Influential Software has been hired by a healthcare training center to replace their legacy systems with more bespoke ones. The team has provided a tailored solution using .NET and a portal framework.
"We are so impressed with the quality of work that was done."
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4
- $10,000+
- 10 - 49 employees
- Wimborne, United Kingdom
Ballard Chalmers is a software development company based just south of London. Founded in 2005, their team provides custom software development, modernisation and integration, as well as support and IT Managed Services.
Clients
- Apex
- Virgin Atlantic Airways
- Ipes
- Good Energy
Industries
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A telecommunications company has hired Transparity Ballard Chalmers to help them improve their business-critical integrations in order to provide enhanced reporting, monitoring, and alerting.
"They will tell you realistically what you can expect."
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5
- $25,000+
- 50 - 249 employees
- London, United Kingdom
Synetec is a software development consultancy headquartered in London. They were established in 2009, and have 26 employees. Synetec's range of services includes cloud, CRM, and business intelligence consulting, software integration, web development, custom software development, and more.
Clients
- Argentex
- Genesis
- Jabre Capital Partners
- Zebedee Capital Partners LLP
Industries
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Synetec developed a bespoke CRM system for a cybersecurity company. The team led a discovery phase, then built the system, including customer management and marketing automation features and an accounts API.
"Synetec spent a lot of time understanding our business."
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6
- $50,000+
- 50 - 249 employees
- Belfast, United Kingdom
Instil Software is a software engineering firm based in Belfast, Northern Ireland. Founded in 2005, Instil has about 30 employees that work across a variety of industries. They offer custom software development, mobile app development, cloud consulting and software integration, IoT, and web development.
Industries
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Instil Software wrote an observability software's code that integrated with an existing Java environment. They’ve since expanded their role to include Java development.
"Great engineers are hard to find and the two we had working with us were clearly top-notch."
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7
- $10,000+
- 2 - 9 employees
- WOLVERHAMPTON, United Kingdom
KSB Technologies is a custom software development company. The small WOLVERHAMPTON, United Kingdom-based team focuses on custom software development, web development, IT strategy consulting, cloud consulting & SI, and more. The agency was founded in 2021.
Clients
- DFE
- Hiscox
- ESFA
- AutoFlow
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KSB Technologies developed a CRM from scratch using Laravel for a SaaS company. They combined tools and features to make communication smoother, covering things like payment records, royalties, and invoicing.
"Remarkably, their cost-effectiveness and adept time management underscored their performance."
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8
- $5,000+
- 10 - 49 employees
- Great Baddow, United Kingdom
Objective is a software development firm. The small Great Baddow, United Kingdom-based team provides custom software development, BI & big data consulting & SI, Artificial Intelligence, conversion optimization, and more. The agency was launched in 1987.
Clients
- Epson
- International Institute for Strategic Studies
- Chelmer Housing Association
- TTP - The Technology Partnership
Industries
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A bicycle wholesale bicycle distributor hired Objective to develop a custom B2B website that integrates with their Sage 200 accounting software. The site enables customers to view products and place orders.
"They were always super helpful and often went above and beyond to help deliver our requirements."
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9
- $25,000+
- 2 - 9 employees
- SHEFFIELD, United Kingdom
Inflecto Systems, a software development company, is located in SHEFFIELD, United Kingdom. The firm provides custom software development, mobile app development, and business consulting and has a small team.The firm was founded in 2006.
Industries
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A payment management system hired Inflecto Systems to provide custom software development and web hosting. Based on the client's requirements and feedback, they're building the system from scratch using Blazor.
''We're happy with what they've delivered.''
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10
- $10,000+
- 10 - 49 employees
- Cambridge, United Kingdom
Founded in 2004, Computer Conquest is an IT managed services company. The company offers IT managed services, cloud consulting & SI, custom software development, IT strategy consulting, and more and has a small team. The company is in Cirencester, United Kingdom.
Clients
- The Woodhouse Partnership
- Brickflow
- Huma Business Intelligence
- Misys / Finastra
Industries
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A sport organization hired CCQ Tech for software development and strategic technical design. CCQ Tech primarily replaces and upgrades software. Key technologies include Salesforce, PostgreSQL, PHP, and .NET.
“The team solves complex problems and is very intelligent.”
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11
- $50,000+
- 50 - 249 employees
- Sutton, United Kingdom
Geeks is a software development company in London. Founded in 2007, Geeks' team of 85 specializes in custom software development, web development, and mobile app development, primarily for midmarket clients in media and govenment.
Clients
- BBC
- EasyJet
- Euromoney
- Mitie
Industries
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A real estate investment fund partnered Geeks Ltd for mobile app and software development services. The Geeks Ltd team created wireframes and continues to build software, APIs, and an iOS and Android app.
"Their team takes our concepts and then creates tangible products."
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12
- $25,000+
- 10 - 49 employees
- London , United Kingdom
Atom CTO is a software company based in London with more than 10 experts. Founded in 2017, they offer IT strategy consulting, application management and support, and business consulting solutions for both small and medium-sized companies.
Clients
- Accelerated Payments Limited
Industries
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Atom CTO provides business consulting services to a startup. They help identify funding opportunities, and they strategize how to increase sales. They also help determine the client's right target market.
"Their work has helped me pivot many times to set myself up for success."
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13
- $10,000+
- 10 - 49 employees
- Manchester, United Kingdom
VTS Software is software development company located in Manchester, U.K. Since 2007, their small team of around 5 has been specializing in custom software, web, and mobile app development for small and mid-sized businesses alike. They have experience in a variety of industries such as advertising, healthcare, manufacturing, and business services.
Clients
- Whispering Smith
- ATS Heritage
- Speakr
Industries
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VTS Software worked on bespoke software development, building both the front- and backend. They used AngularJS and C# for the Silverlight, native Android, and web app development.
"All the requirements were delivered within the defined scope and timeframe."
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14
- $1,000+
- 10 - 49 employees
- London, United Kingdom
Takeaway Reality is an AR/VR development company headquartered in London, United Kingdom. The small firm was established in 2020. Their team offers AR/VR development, marketing strategy, mobile & app marketing, and business consulting.
Clients
- Microsoft
- Ford
Industries
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Takeaway Reality developed a web-based AR app for a university professor. This app helps students understand the physics behind a flywheel governor and its dynamics in a steam engine.
“I valued the fact that I interacted with the owner a lot. He was very invested in ensuring that the project succeeded.”
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15
- $25,000+
- 10 - 49 employees
- York, United Kingdom
Thumbmunkeys Ltd is a mobile app development company based in York, United Kingdom. This company was founded in 2012 and has 25+ employees. Thumbmunkeys Ltd is responsible for mobile app development, web development, and wearable app development.
Clients
- Capita
- Transport for London
- Stansted Express
- SAP
Industries
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Thumbmunkeys Ltd has developed a native Android and iOS application for a Web3 analytics company. Thumbmunkeys Ltd adapted the client’s web application and provided feedback about its coding and architecture.
“Thumbmunkeys Ltd has done a great job adapting to our existing product.”
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16
- $50,000+
- 10 - 49 employees
- Manchester , United Kingdom
Founded in 2010, Silverchip is located in Manchester, United Kingdom. Their team of 13 employees provides mobile app development and custom software development services for enterprise, midmarket, and small businesses.
Clients
- Suits Me Banking
- England Squash
- LGBT Foundation
- Boundary Outlet
Industries
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Silverchip developed a documentation system to make it quicker and more customizable. They built out the database architecture and added a template builder. They developed with React, JavaScript, and C++.
“They enjoy what they do, and it shows in what they deliver to their clients.”
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17
- $10,000+
- 10 - 49 employees
- Southend-on-Sea, United Kingdom
Software agency Atlas - Clever Software is headquartered in Essex and another office in London. With 17 employees, the agency specializes in web, custom software, mobile app development, and more for mainly midmarket businesses.
Clients
- Barclays
- Investec Asset Management
- M & G
- Prudential
Industries
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Dedicated members of the Atlas team worked to develop a new and mobile-optimized quoting solution that can handle a complex pricing model and allows for greater customer support.
"The cleverness displayed by Atlas really gave us confidence in knowing that they would deliver."
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18
- $10,000+
- 10 - 49 employees
- Bury St Edmunds, United Kingdom
SourceCodeStudio is a small custom software development company. The Bury St Edmunds, United Kingdom-based company was founded in 2016. Their services include custom software development, ux/ui design, web development, e-commerce development, and more.
Clients
- Parcel SafePlace
- Xperience
- Bishop & Miller
- Hogarths
Industries
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SourceCodeStudio redesigned a website for a marketing consultancy. They handled integrations into a new CRM and an existing auction platform. They also improved the site’s UX/UI and performance.
"Their complete dedication to the objectives and end result was impressive."
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19
- $5,000+
- 2 - 9 employees
- Northampton, United Kingdom
Full Metal Software is a bespoke software development agency located in Northampton, England. Founded in 2004, they have three employees specializing in full stack web development and innovative business solutions for small and midmarket companies, typically in business services, finance, and healthcare. Services include project management, code updating, CMS support, software development, and outsourcing.
Clients
- YourGene Health
- Pastdrives Ltd
- Zanzibar Amber Resort
Industries
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Full Metal Software helped a digital creative agency with a data migration project for one of their end clients. They were responsible for taking data from Umbraco and transforming it into a workable format.
“We didn't have any expectations going into the project, and we were very satisfied with what we received.”
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20
- $5,000+
- 10 - 49 employees
- Coventry , United Kingdom
Imobisoft is a full-service mobile app & software development company based in Coventry, U.K., with an office in London. The company, founded in 2007, has a team of more than ten that provides custom software development, digital strategy, IoT development, web development, BI & big data consulting & SI, and SEO services. Imobisoft serves midmarket and other-sized companies in the medical, manufacturing, utilities, energy & natural resources, financial services, ane e-commerce industries.
Clients
- NHS (Multiple divisions)
- BSkyB
- E-Energy
- Northern Gas Networks
Industries
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An energy supplier hired Imobisoft to provide web and app development. Their efforts also include UI/UX design for a platform that allows salespeople to streamline their processes.
"Imobisoft developed a web and mobile app using .NET technologies. The application allows us to bring on thousands of new customers . Without the software they created for us, we wouldn’t be generating sales. We're very satisfied with the design and the application, and it couldn’t be better".
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21
- $25,000+
- 10 - 49 employees
- Manchester, United Kingdom
Based in Manchester, UK, Corporation Pop has been around for over a decade and is now an established part of the mobile and web development industry. The small team delivers powerful results to clients across several industries.
Clients
- NHS
- The Cream Group
- Live Nation
- BBC
Industries
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Corporation Pop developed a website for an outdoor event specialist's nationwide event series with specific pages for each event. After scoping the project, they collaborated with the client's branding vendor.
"Corporation Pop is very creative and experienced, filling us with confidence in their work."
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22
- $10,000+
- 2 - 9 employees
- Bristol, United Kingdom
Blue Sparrow Apps is a development agency based in Bristol, England, and founded in 2015. With fewer than 10 employees, they specialize in mobile app and custom software development solutions for both small and medium-sized businesses.
Clients
- FanHub
- Coeus Software
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A food stall solutions company was looking to develop a streamlined service to connect food vendors and businesses, so they engaged with Blue Sparrow to create an iOS and Android-based mobile app.
"I had direct contact with the founder and had regular conversations with the developers."
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23
- $50,000+
- 50 - 249 employees
- Leeds, United Kingdom
Audacia is a bespoke software development firm headquartered in Leeds, UK. Founded in 2007, and have about 30 employees, most of their clients are large-scale enterprises in the European market. They provide custom software development, web development, mobile apps, software integration, and staff augmentation.
Clients
- O2
- Story Homes
- AESSEAL
- ADM Agriculture
Industries
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Audacia developed an online platform for a mortgage lender. The platform automated the client's end-to-end processes; it automated loan repayment calculations and eliminated manual-based processes.
"Communication was very good and consistent throughout the project, benefiting from tight feedback loops."
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24
- $25,000+
- 10 - 49 employees
- London , United Kingdom
AVAMAE is a software solutions agency run by a team of fewer than 50 professionals founded in 2011. Based in London, the company offers custom software, web, and mobile app development services for small and medium-sized businesses from various industries, such as business services, financial services, and health care.
Clients
- BetDSI
- Strengthscope
- Clevry
- Buyfair
Industries
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AVAMAE Software Solutions Ltd has provided consulting to a SaaS startup to help them define their platform’s requirements. Additionally, they’ve created the UI/UX design to showcase the product to investors.
“AVAMAE has been a helpful partner, and they’ve basically become the technology brain behind our fundraising process.”
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25
- $5,000+
- 50 - 249 employees
- Exeter, United Kingdom
Software Solved is an Exeter, United Kingdom-based custom software development company. They specialize in custom software development, BI & big data consulting & SI, cloud consulting & SI, Artificial Intelligence, and more and were launched in 1998.
Industries
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A lift installation and maintenance company was looking to modernize their operations, so they engaged with Software Solved to serve as their primary custom software and mobile app development partner.
"Because of their team, we’ve grown into a financially successful company."
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26
- $1,000+
- 10 - 49 employees
- Chantry, United Kingdom
Established in 2022, OnTheBlockGaming is a. The company offers and has a small team. The company is headquartered in , United Kingdom.
Clients
- Outboundless
- Pretendo
- Preezy
- Truly Simplistic innovations
Industries
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On The Block Gaming developed a short game for an advertising and marketing company. Features included a user authentication system, dialogue screens, player interactions, and PlayFab-powered customization.
"They didn't just take orders; they wanted to understand what we were trying to accomplish."
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27
- $25,000+
- 10 - 49 employees
- London, United Kingdom
Silicon Reef are a SharePoint development & Microsoft 365 solutions agency. Founded in 2016, they are located in the United Kingdom with offices in London, Chester, and Bournemouth. They offer a range of services from consultancy, campaign-based web or app development, and front-end creative. They also offer full-blown migration, strategic road-mapping, and full-service development partnerships and partner with medium-sized to enterprise clients.
Clients
- Unilever
- Asahi
- Anglo American
- SEGA
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Silicon Reef helped a CPG company build custom software that executes questions and collects data. After defining the requirements and expectations, the team worked from MVP and development to launch.
"I liked their professionalism."
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28
- $5,000+
- 2 - 9 employees
- Colchester, United Kingdom
Chick Digital, a website development firm, was established in 2015. The small team offers web development, BI & big data consulting & SI, custom software development, and Artificial Intelligence. The company is in Colchester, United Kingdom.
Clients
- Gay Times
- Unitas
- Muntons
- Punch Pubs
Industries
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Chick Digital provides ongoing development support for a media company. They help fix bugs, create engaging templates, maintain the client's analytics tools, and work on continuous improvements for the site.
"I am impressed by their ability to transform lengthy and costly processes into simpler and cost-effective ones."
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29
- Undisclosed
- 2 - 9 employees
- Bollington, United Kingdom
ACS is a software house based in Bollington, England, and founded in 2099. Their team of no more than 10 specializes in custom software development, mobile app development, and big data consulting solutions for clients in the fields of hospitality and healthcare.
Clients
- Common Goal
- The Manchester United Supporters Trust
- Fifa
- Sony Music
Industries
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ACS developed a custom site with transaction capabilities for a nonprofit. Currently, they continue to provide support on the client's backend process, ensuring that the content management and CRM work well.
"They’re really making an effort to get to the bottom of our challenges."
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30
- $25,000+
- 50 - 249 employees
- London, United Kingdom
Esynergy is a big data analytics company. They are headquartered in London, United Kingdom and have a midsize team. Their services include BI & big data consulting & SI, cloud consulting & SI, custom software development, mobile app development, and more.
Industries
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A streaming services company hired esynergy for cloud and cybersecurity services. They hosted their servers on AWS, took care of coding, and created a high-security password vault, among other tasks.
''All outcomes and goals that were set at the beginning of the project were fully met.''
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