Top 100 Systems Integrator Companies in the United Kingdom
The Best of February 2026List of the Best United Kingdom System Integrators
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1$100,000+1,000 - 9,999 employeesWrocław, PolandLaunched in 2002, N-iX is a big data company. The large team provides BI & big data consulting & SI, Artificial Intelligence, Custom Software Development, cloud consulting & SI, and more. The firm is located in North Miami Beach, Florida; Malmö, Sweden; North Miami Beach, Florida and Kraków, Poland.Read More
Clients
Bosch Siemens eBay Total EnergiesIndustries
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2$25,000+1,000 - 9,999 employeesLondon, EnglandRead More
Keyrus is a digital consulting agency that has been offering BI and Big Data consulting, IT strategy consulting, Cloud consulting, and SI services to their clients in the retail, business services, and financial services industries since 1996. Their 10,000 employees are based out of their offices in London, NYC, LA, D.C., France, and Toronto.
Clients
DannonIndustries
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3$25,000+1,000 - 9,999 employeesLondon, EnglandLaunched in 1998, Itransition is a large custom software development firm. Their services include Custom Software Development, BI & big data consulting & SI, cloud consulting & SI, E-Commerce Development, and more. The agency is located in Denver, Colorado; London, England; Vilnius, Lithuania and Warszawa, Poland.Read More
Clients
ExpediaIndustries
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4$25,000+250 - 999 employeesGliwice, PolandLocated in Gliwice, Poland; Ternopil, Ukraine; London, England and Düsseldorf, Germany, Future Processing is a software development firm. The midsize agency was launched in 2000. Their services include Custom Software Development, cloud consulting & SI, BI & big data consulting & SI, Web Development, and more.Read More
Clients
AllocateIndustries
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5$50,000+250 - 999 employeesLondon, EnglandBig data company Opinov8 Digital and Engineering Solutions was founded in 2017. They are located in London, England; Kyiv, Ukraine; Cairo, Egypt and Weybridge, England and have a midsize team. Their services include BI & big data consulting & SI, AI Consulting, Artificial Intelligence, cloud consulting & SI, and more.Read More
Clients
Fortune 500 CompaniesIndustries
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6$50,000+1,000 - 9,999 employeesLondon, EnglandLocated in New York, New York; London, England; Marietta, Georgia and San Francisco, California, Vention is a large IT staff augmentation company. Founded in 2002, the team provides IT staff augmentation, Custom Software Development, Web Development, Mobile App Development, and more.Read More
Clients
IBM PayPal pwc IC MarketsIndustries
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7$10,000+50 - 249 employeesSaint Helier, JerseyIn Saint Helier, Jersey; St Peter Port, Guernsey; Coventry , United Kingdom and Leicester , United Kingdom, Calligo is a cloud consulting & SI company. They offer cloud consulting & SI, Artificial Intelligence, and BI & big data consulting & SI and were established in 2010.Read More
Clients
MicrosoftIndustries
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8Undisclosed1,000 - 9,999 employeesLondon, EnglandAI firm ZONE3000 was launched in 1998. They are in London, England; Dubai, United Arab Emirates and L'viv, Ukraine and have a large team. ZONE3000 provides Artificial Intelligence, BI & big data consulting & SI, and IT staff augmentation.Read More
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9$25,000+250 - 999 employeesYerevan, ArmeniaRead More
SADA Systems, with a team of 350+ employees, is a software consulting agency that was founded in 2000. SADA Systems is headquartered in Los Angeles, with an office in Washington. The agency helps a variety of clients with their cloud consulting and system integration, IT strategy consulting, and software development needs.
Clients
Colgate-PalmoliveIndustries
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10$10,000+250 - 999 employeesLondon, England*instinctools is a Stuttgart, Germany-based user experience design agency. They provide UX/UI Design, BI & big data consulting & SI, cloud consulting & SI, IT staff augmentation, and more and were founded in 2000.Read More
Clients
Daimler Fujitsu Nostrum SpexAIIndustries
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11$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.
Clients
BNY Mellon DPD Acino DRAXIndustries
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12$100,000+1,000 - 9,999 employeesLisboa, PortugalRead More
CI&T (formerly CINQ Technologies) is software development company based in Curitiba, Brazil with additional offices in Brazil and Miami. Founded in 1992, the team of 271 specializes in custom software development, IT staff augmentation, and UX/UI design. They work primarily with enterprise clients in the transportation and financial services industries.
Clients
SITAIndustries
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13$25,000+50 - 249 employeesTallinn, EstoniaUvik Software is a midsize Tallinn, Estonia-based IT staff augmentation company. Launched in 2015, the team specializes in IT staff augmentation, BI & big data consulting & SI, Artificial Intelligence, and Custom Software Development.Read More
Clients
Drakontas LLC Community Connect Labs Vodafone Simple Legal (OnIt)Industries
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14$25,000+50 - 249 employeesSalford, EnglandIn Salford, England; London, England and Houston, Texas, Digiryte is a cloud consulting & SI company. They focus on cloud consulting & SI, Mobile App Development, Custom Software Development, Digital Strategy, and more and were founded in 2016.Read More
Clients
NHSIndustries
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15$75,000+1,000 - 9,999 employeesLondon, EnglandNashTech is a large software development company. The London, England-based company was established in 2000. Their services include Custom Software Development, cloud consulting & SI, Generative AI, Digital Engineering, and more.Read More
Industries
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16$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.
Clients
Apex NSPCC NHS LushIndustries
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17$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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18$10,000+1,000 - 9,999 employeesLondon, EnglandXebia is a large cloud consulting & SI company launched in 2001. Their team provides cloud consulting & SI, IT strategy consulting, Custom Software Development, BI & big data consulting & SI, and more. The agency is in Wrocław, Poland; Rzeszów, Poland; Gdańsk, Poland and Atlanta, Georgia.Read More
Clients
YellIndustries
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19$1,000+1,000 - 9,999 employeesLondon, EnglandDotsquares, an IT managed services company, was founded in 2002. Their large team is located in London, England; Mount Waverley, Australia; Albourne, England and Jaipur, India. The agency offers IT managed services, Web Development, Custom Software Development, Mobile App Development, and more.Read More
Clients
EricssonIndustries
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20$50,000+1,000 - 9,999 employeesLondon, EnglandCustom software development firm Andersen Inc. Was launched in 2007. The large team offers Custom Software Development, IT managed services, Mobile App Development, IT strategy consulting, and more. The company is in Warszawa, Poland; Kraków, Poland; Dallas, Texas and London, England.Read More
Clients
SamsungIndustries
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21$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
Clients
Ocado Technology Metro Markets Nasdaq InvescoIndustries
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22$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
Clients
HughesNetIndustries
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23$25,000+1,000 - 9,999 employeesLondon, EnglandRead More
TatvaSoft is a custom software development company headquartered in Ahmedabad, India; Murphy, Texas; Melbourne, Australia and London, England. Established in 2001, the large team focuses on Custom Software Development, Web Development, Mobile App Development, cloud consulting & SI, and more.
Clients
Anglo AmericanIndustries
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24$50,000+1,000 - 9,999 employeesLondon, EnglandCustom software development firm Kellton is in Reston, Virginia; PERYDOT, Poland; Gurugram, India and Plano, Texas. The large agency was launched in 2009. Their services include Custom Software Development, Mobile App Development, Artificial Intelligence, BI & big data consulting & SI, and more.Read More
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25$25,000+250 - 999 employeesNovi Sad, SerbiaVega IT is a Novi Sad, Serbia-based custom software development company. Established in 2008, the midsize team offers Custom Software Development, CRM consulting and SI, Mobile App Development, E-Commerce Development, and more.Read More
Clients
Howden Group Arthur D. Little Costa Coffee UniCredit bankIndustries
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26$25,000+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
Clients
Farfetch IPSOS Elfa Group BTG PactualIndustries
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27Undisclosed50 - 249 employeesLondon, EnglandAbacus Cambridge Partners, an ERP consulting and SI company, is based in London, England; Dubai, United Arab Emirates; Riyadh, Saudi Arabia and New York, New York. They focus on ERP consulting and SI, BI & big data consulting & SI, Custom Software Development, Call Center Services, and more and were founded in 2017.Read More
Clients
Hafilat Industry LLCIndustries
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28$10,000+250 - 999 employeesLondon, EnglandSoftware development firm SoftProdigy is in Sahibzada Ajit Singh Nagar, India; London, England and Great Neck, New York. The midsize agency was founded in 2006. Their services include Custom Software Development, Mobile App Development, Artificial Intelligence, cloud consulting & SI, and more.Read More
Clients
DeloitteIndustries
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29$5,000+50 - 249 employeesLondon, EnglandMagicFuse is a London, England-based CRM consulting and SI company. The firm provides CRM consulting and SI and Custom Software Development and is midsize.The firm was launched in 2019.Read More
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30$10,000+250 - 999 employeesLondon, EnglandSENLA is a midsize software development company. Located in Warszawa, Poland; London, England and Zagreb, Croatia, the agency was established in 2012. Their team focuses on Custom Software Development, Web Development, Mobile App Development, Blockchain, and more.Read More
Clients
Abbott BOSCH KPMG Western UnionIndustries
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