Top 100 C# Developers in the United Kingdom
The Best of December 2025Looking 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$25,000+250 - 999 employeesLondon, EnglandRead More
Future Processing, a software development firm, was founded in 2000. They are based in Gliwice, Poland; Ternopil, Ukraine; London, England and Düsseldorf, Germany and have a midsize team. Future Processing provides Custom Software Development, cloud consulting & SI, BI & big data consulting & SI, Web Development, and more.
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AllocateIndustries
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2$50,000+1,000 - 9,999 employeesLondon, England10Pearls is a custom software development company located in Vienna, Virginia; Medellín, Colombia; New York, New York and San Rafael de Escazú, Costa Rica. The large firm was established in 2004. Their services include Custom Software Development, Mobile App Development, Artificial Intelligence, cloud consulting & SI, and more.Read More
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HughesNetIndustries
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3$10,000+250 - 999 employeesNovi Sad, SerbiaVega IT is a midsize software development firm established in 2008. Their services include Custom Software Development, CRM consulting and SI, Mobile App Development, E-Commerce Development, and more. The agency is headquartered in Novi Sad, Serbia; New York, New York and London, England.Read More
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4$25,000+1,000 - 9,999 employeesLondon, EnglandRead More
ELEKS is a custom software development firm established in 1991. Their large team is in Tallinn, Estonia; L'viv, Ukraine; Berlin, Germany and Rzeszów, Poland. Their services include Custom Software Development, BI & big data consulting & SI, cloud consulting & SI, Cybersecurity, and more.
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BNY Mellon DPD Acino DRAXIndustries
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5$10,000+250 - 999 employeesLondon, EnglandRead More
Founded in 2015, Transparity is a cloud consulting & SI company. The midsize London, England-based team offers cloud consulting & SI, IT managed services, Custom Software Development, Artificial Intelligence, and more.
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Apex NSPCC NHS LushIndustries
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6$10,000+50 - 249 employeesLondon, EnglandRead More
Haefele Software is a midsize Cape Town, South Africa-based software development company. They focus on Custom Software Development, Enterprise App Modernization, Web Development, API Development, and more and were founded in 2006.
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Tesco Burger King AS Watson Group PikmykidIndustries
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7$25,000+1,000 - 9,999 employeesLondon, EnglandLocated in Ahmedabad, India; Murphy, Texas; Melbourne, Australia and London, England, TatvaSoft is a custom software development firm. The large firm was launched in 2001. Their services include Custom Software Development, Web Development, Mobile App Development, and cloud consulting & SI.Read More
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Anglo AmericanIndustries
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8$5,000+50 - 249 employeesLondon, EnglandDigis, a Fiverr company (NYSE: FVRR) is a custom software development company and web development firm. Launched in 2015, the team offers Custom Software Development and Web Development. Their midsize firm is in London, England; New York, New York; București, Romania and L'viv, Ukraine.Read More
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Blablacar Hubspot PwC HumaIndustries
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9$10,000+50 - 249 employeesLondon, EnglandInfluential Software is a London, England-based software development firm. The midsize team focuses on Custom Software Development, Web Development, BI & big data consulting & SI, IT managed services, and more and was founded in 1993.Read More
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DeloitteIndustries
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10$50,000+1,000 - 9,999 employeesCraiova, RomaniaRead More
Pentalog is a large Brașov, Romania-based custom software development company. Established in 1993, the team offers custom software development, IT staff augmentation, e-commerce development, and web development.
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AdidasIndustries
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11$50,000+50 - 249 employeesL'viv, UkraineRead More
Unicrew is a software development firm located in L'viv, Ukraine; Ormond Beach, Florida and London, England. The midsize company was founded in 2012. Their team focuses on Custom Software Development, Web Development, IT staff augmentation, and Mobile App Development.
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Jack Cooper Transport Bigfood Group Booked It Open Room Inc.Industries
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12$10,000+50 - 249 employeesLondon, EnglandBased in Sofia, Bulgaria and London, England, BGO Software - The Digital Health Lab is a custom software development firm. The midsize company was founded in 2008. Their services include Custom Software Development, IT strategy consulting, IT managed services, Mobile App Development, and more.Read More
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NHS UK - Department of Health, Roche, LabCorp, IQVIA, Curaden, Ampersand Health, BodySpec and many other HealthTech companies.Industries
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13$25,000+250 - 999 employeesLondon, EnglandAltkom Software is a Warszawa, Poland-based custom software development firm. They specialize in Custom Software Development, Mobile App Development, Enterprise App Modernization, and cloud consulting & SI and were launched in 2000.Read More
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BNP ParibasIndustries
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14$25,000+250 - 999 employeesLondon, EnglandSTX Next is an AI firm established in 2005. The company focuses on Artificial Intelligence, BI & big data consulting & SI, Custom Software Development, Web Development, and more and has a midsize team.Read More
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Mastercard Canon Hogarth ManIndustries
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15$1,000+1,000 - 9,999 employeesLondon, EnglandRead More
Dotsquares is an IT managed services company in London, England; Mount Waverley, Australia; Albourne, England and Jaipur, India. The firm specializes in IT managed services, Web Development, Custom Software Development, Mobile App Development, and more and has a large team.The firm was founded in 2002.
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EricssonIndustries
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16$100,000+1,000 - 9,999 employeesNew York, NYSoftware development firm DataArt is located in New York, New York; Zug, Switzerland; London , England and München, Germany. Established in 1997, the large team provides Custom Software Development, IoT development, Artificial Intelligence, BI & big data consulting & SI, and more.Read More
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Ocado Technology Metro Markets Nasdaq InvescoIndustries
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17$5,000+1,000 - 9,999 employeesSt Albans, EnglandFCamara is an user experience agency. Their large team is in São Paulo, Brazil; Leiria, Portugal; St Albans, England and Dubai, United Arab Emirates. Their services include UX/UI Design, IT strategy consulting, cloud consulting & SI, IT staff augmentation, and more. The firm was founded in 2006.Read More
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Farfetch IPSOS Elfa Group BTG PactualIndustries
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18$25,000+1,000 - 9,999 employeesLondon, EnglandItransition is a custom software development company founded in 1998. Their large team is located in Denver, Colorado; London, England; Vilnius, Lithuania and Warszawa, Poland and specializes in Custom Software Development, BI & big data consulting & SI, cloud consulting & SI, ERP consulting and SI, and more.Read More
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ExpediaIndustries
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19$50,000+250 - 999 employeesLondon, EnglandMethod is a midsize UX agency. They specialize in UX/UI Design, Custom Software Development, Digital Strategy, Mobile App Development, and more and were launched in 1999. The agency is located in New York, New York; London, England; Santa Clara, California and Charlotte, North Carolina.Read More
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20$100,000+1,000 - 9,999 employeesWrocław, PolandN-iX, a big data analytics company, was founded in 2002. In North Miami Beach, Florida; Malmö, Sweden; North Miami Beach, Florida and Kraków, Poland, their large team provides BI & big data consulting & SI, Artificial Intelligence, Custom Software Development, cloud consulting & SI, and more.Read More
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Bosch Siemens eBay Total EnergiesIndustries
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21$25,000+50 - 249 employeesLondon, EnglandMidsize software development firm GoodCore Software, is headquartered in London, England; Karachi, Pakistan and Cyberjaya, Malaysia. Founded in 2005, the team specializes in Custom Software Development, Artificial Intelligence, Web Development, IT strategy consulting, and more.Read More
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PMLL GCBF Hirevine London Women's ClinicIndustries
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22$10,000+10 - 49 employeesBedford, EnglandCustom software development firm Unity Developers was launched in 2017. Their small team is located in Bedford, United Kingdom. Unity Developers offers custom software development, mobile app development, AR/VR development, product design, and more.Read More
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SAPIndustries
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23$50,000+250 - 999 employeesFarnborough, EnglandOne Beyond is an UX design company. Their midsize team is headquartered in Farnborough, England; Madrid, Spain; Budapest, Hungary and Szeged, Hungary. The firm focuses on UX/UI Design, IT strategy consulting, cloud consulting & SI, IT staff augmentation, and more.Read More
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Smith & NephewIndustries
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24$50,000+50 - 249 employeesBelfast, Northern IrelandRead More
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.
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25$10,000+250 - 999 employeesLondon, EnglandRead More
Launched in 2000, *instinctools is a software development company. The midsize team specializes in Custom Software Development, Web Development, IT strategy consulting, Mobile App Development, and more. The firm is in Stuttgart, Germany; Warszawa, Poland; Mississauga, Canada and Wilmington, Delaware.
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Daimler Fujitsu Nostrum SpexAIIndustries
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26$25,000+50 - 249 employeesLondon, EnglandSynetec, an AI development company, is located in London, England. They specialize in Artificial Intelligence, AI Consulting, Custom Software Development, and Web Development and were founded in 2009.Read More
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ArgentexIndustries
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27$5,000+10 - 49 employeesGreat Baddow, EnglandRead More
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.
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EpsonIndustries
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28$10,000+10 - 49 employeesLondon, EnglandRead More
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.
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The Woodhouse Partnership Brickflow The International Stock Exchange London UndergroundIndustries
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29$25,000+250 - 999 employeesChicago, ILTekRevol is a midsize application development company founded in 2018. Their team specializes in Mobile App Development, IT staff augmentation, Custom Software Development, Web Development, and more. The company is located in Houston, Texas; Red Deer, Canada; Newark, California and New York, New York.Read More
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30$10,000+50 - 249 employeesAberdeen, ScotlandRead More
Fabrit Global is a web app development company based in Aberdeen, U.K., with an office in Cluj-Napoca, Romania. The company, founded in 2014, has a team of more than 30 that provides web development and custom software development services. Fabrit Global serves mid-market and small companies in various industries that include financial services, hospitality & leisure, and energy & natural resources.
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Societe GeneraleIndustries
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