Top 100 Systems Integrator Companies in the United Kingdom
The Best of December 2025List of the Best United Kingdom System Integrators
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1$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.
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DannonIndustries
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2$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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3$25,000+1,000 - 9,999 employeesLondon, EnglandItransition, a software development company, was founded in 1998. They are headquartered in Denver, Colorado; London, England; Vilnius, Lithuania and Warszawa, Poland and have a large team. Their services include 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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4$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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5$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
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MicrosoftIndustries
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6$50,000+250 - 999 employeesLondon, EnglandRead More
Opinov8 Digital and Engineering Solutions is a cloud consulting & SI company launched in 2017. The firm provides cloud consulting & SI, IT staff augmentation, BI & big data consulting & SI, Custom Software Development, and more and has a midsize team. The firm is located in London, England; Kyiv, Ukraine; Cairo, Egypt and Weybridge, England.
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Fortune 500 CompaniesIndustries
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7$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.
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Colgate-PalmoliveIndustries
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8$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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9$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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10Undisclosed1,000 - 9,999 employeesLondon, EnglandHeadquartered in Dubai, United Arab Emirates; L'viv, Ukraine and London, England, ZONE3000 is an AI company. Founded in 1998, the large team provides Artificial Intelligence, BI & big data consulting & SI, and IT staff augmentation.Read More
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11$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.
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SITAIndustries
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12$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
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NHSIndustries
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13$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
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14$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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15$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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16$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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17$50,000+1,000 - 9,999 employeesLondon, EnglandRead More
Andersen Inc. Is a software development company based in Warszawa, Poland; Kraków, Poland; Dallas, Texas and London, England. The large team provides Custom Software Development, IT managed services, Mobile App Development, IT strategy consulting, and more. The agency was established in 2007.
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SamsungIndustries
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18$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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19$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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20$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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21$25,000+1,000 - 9,999 employeesLondon, EnglandTatvaSoft 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.Read More
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Anglo AmericanIndustries
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22$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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23$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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24$10,000+250 - 999 employeesLondon, EnglandIn Sahibzada Ajit Singh Nagar, India; London, England and Great Neck, New York, SoftProdigy is a software development company. The midsize agency was launched in 2006. Their team offers Custom Software Development, Mobile App Development, Artificial Intelligence, cloud consulting & SI, and more.Read More
Clients
DeloitteIndustries
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25$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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26Undisclosed50 - 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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27$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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28$5,000+250 - 999 employeesLondon, EnglandRead More
Coders Dev is a web design and mobile app development company based in London with offices in Singapore and Abu Dhabi, U.A.E. The company, founded in 2010, has more than 500 employees and provides web development and AI services. Coders Dev serves small and larger-sized companies in the health care & medical, hospitality & leisure, consumer products & services, financial services, gaming, telecommunications, automotive, manufacturing, and e-commerce industries.
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British TelecomIndustries
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29$5,000+50 - 249 employeesLondon, EnglandRead More
Founded in 2019, MagicFuse is a midsize CRM consulting and SI company. Their services include CRM consulting and SI and Custom Software Development. The agency is headquartered in London, England and L'viv, Ukraine.
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30$5,000+10 - 49 employeesEdinburgh, ScotlandLaunched in 2012, Texaport is an IT managed services company. The small team provides IT managed services, Cybersecurity, cloud consulting & SI, IT strategy consulting, and more. The firm is headquartered in Edinburgh, Scotland; Glasgow, Scotland; London, England and Manchester, England.Read More
Industries
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