Top 100 Application Modernization Companies in London
The Best of November 2026Looking for a top legacy modernization service in London?
Application modernization companies can help create new business value from existing applications. Finding the right company to partner with, however, can be an overwhelming process.
To assist you in your search for a partner, we’ve compiled this list of the top application modernization services in London. Browse descriptions, feedback, and awards to find which can best suit your company’s needs.
List of the Best London Enterprise Application Modernization Services
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121$10,000+10 - 49 employeesHarpenden, EnglandSoftware development firm This Is Software was founded in 2023. The small Harpenden, England-based team offers Custom Software Development, Web Development, Artificial Intelligence, and Enterprise App Modernization.Read More
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122$5,000+2 - 9 employeesLondon, EnglandWeb design agency RiseForge is headquartered in Tiranë, Albania and London, England. The team provides Web Design and UX/UI Design.Read More
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123$25,000+50 - 249 employeesStevenage, EnglandRead More
LAYOUTindex is a small e-commerce development company. They offer e-commerce development, mobile app development, web development, custom software development, and more and were founded in 2009. The agency is in Madison, Alabama; Paris, France and Colombo, Sri Lanka.
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124Undisclosed2 - 9 employeesLondon, EnglandBlockchain company OAAM Consulting Ltd was founded in 2013. The small team focuses on Blockchain and Blockchain Marketing.Read More
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125$25,000+10 - 49 employeesCrowborough, EnglandCustom software development company Elysium Ltd is headquartered in Crowborough, England. The company focuses on Custom Software Development, DevOps Managed Services, Enterprise App Modernization, Application Management & Support, and more and is small.The company was founded in 1991.Read More
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126$25,000+50 - 249 employeesBerkhamsted, EnglandApplication Management & Support company Propel Tech Ltd was launched in 2007. The agency offers Application Management & Support and Custom Software Development.Read More
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Quickline Communications Limited J.C.B - J.C. Bamford Excavators Limited Allsop Property Auction Mi Hub LTDIndustries
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127$1,000+10 - 49 employeesWindsor, EnglandRead More
Located in Mississauga, Canada and Kolkata, India, Primary Infotech Private Limited is an app development firm. The small company was founded in 2019. Their services include mobile app development, web design, and e-commerce development.
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128$10,000+50 - 249 employeesMaidenhead, EnglandNeosAlpha Technologies is an IT strategy consulting company. In Maidenhead, England and Jaipur, India, their team offers IT strategy consulting and Enterprise App Modernization.Read More
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129$5,000+250 - 999 employeesSlough, EnglandSoftoo is an IT staff augmentation company. The Slough, England-based agency specializes in IT staff augmentation and Custom Software Development.Read More
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ConfigureIndustries
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130Undisclosed50 - 249 employeesBerkshire , EnglandECM consulting and SI company Proventeq was founded in 2007. They are in Berkshire , England; Pune, India and دبي, United Arab Emirates and have a midsize team. Their services include ECM consulting and SI, AI Agents, AI Consulting, cloud consulting & SI, and more.Read More
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131$5,000+10 - 49 employeesBracknell, EnglandAncoris is a cloud consulting & SI company. Their team is headquartered in Bracknell, England and offers cloud consulting & SI and Application Management & Support.Read More
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132$1,000+10 - 49 employeesBillericay, EnglandAlpha Hive AI is a custom software development firm. They are in Billericay, England and Austin, Texas and have small team. They specialize in Custom Software Development and Mobile App Development.Read More
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133Undisclosed50 - 249 employeesThird Avenue Marlow, EnglandDeveloping World Systems Ltd, an Application Testing company, was founded in 1998. They specializes in Application Testing and Enterprise App Modernization.Read More
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134$1,000+2 - 9 employeesLoose, EnglandStackslim, a website development firm, is located in Loose, England. The company specializes in Web Development, E-Commerce Development, Web Design, ERP consulting and SI, and more and has a small team.The company was launched in 2025.Read More
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135Undisclosed10 - 49 employeesBasildon, EnglandBrendata UK LTD is a custom software development firm launched in 1992. The agency provides Custom Software Development and Web Design.Read More
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136Undisclosed10 - 49 employeesHigh Wycombe, EnglandCirronex is a small High Wycombe, England-based Application Testing company. Their services include Application Testing and Application Management & Support.Read More
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137$10,000+2 - 9 employeesGuilden Morden, EnglandRead More
Crowers Limited, a custom software development company, is based in Guilden Morden, United Kingdom. The company specializes in custom software development, mobile app development, web development, web design, and more and has a small team.The company was founded in 2017.
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XylemIndustries
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138$250,000+10,000+ employeesCaldecotte, EnglandCloud consulting & SI company ITC Infotech focuses on cloud consulting & SI and ERP consulting and SI. They were launched in 2000.Read More
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139$50,000+10 - 49 employeesEarley, EnglandLaunched in 2019, VA Software Solutions ltd is a custom software development company. Based in Earley, England and Sofia, Bulgaria, the team focuses on Custom Software Development and Web Development.Read More
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140$25,000+2 - 9 employeesReading, EnglandAgentify is a custom software development firm. They are in Reading, United Kingdom and have a small team. Their services include custom software development, Artificial Intelligence, application management & support, enterprise app modernization, and more.Read More
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141$25,000+2 - 9 employeesBordon, EnglandPivale is a Business Consulting company. The Bordon, England-based agency was founded in 2008. Their team specializes in Business Consulting and Web Design.Read More
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142Undisclosed250 - 999 employeesBrighton and Hove, EnglandUX design agency Catalyst IT was launched in 1997. The company provides UX/UI Design and Custom Software Development.Read More
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143$5,000+10 - 49 employeesBedford, EnglandLaunched in 2008, Anterec Ltd is a software development firm. The firm specializes in Custom Software Development and Web Development, and is small.Read More
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144$25,000+2 - 9 employeesMilton Keynes, EnglandNugon is a small software development company. They focus on Custom Software Development and Enterprise App Modernization and were launched in 2020.Read More
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145$25,000+2 - 9 employeesCambridge, EnglandOrthogonality is a Cambridge, England-based software development firm. They offer Custom Software Development and Web Development.Read More
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146Undisclosed250 - 999 employeesLondon, EnglandWestbrook International is a CRM consulting and SI company founded in 1992. The midsize team provides CRM consulting and SI and Enterprise App Modernization.Read More
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147Undisclosed250 - 999 employeesBrentford, EnglandBusiness Pro Designs is an app development firm. Founded in 2007, the company is based in Brentford, England. Their team focuses on Mobile App Development and Web Design.Read More
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148Undisclosed50 - 249 employeesLondon, EnglandSquirro is a midsize Generative AI company. Founded in 2012, the team offers Generative AI and BI & big data consulting & SI.Read More
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Bank of England OCBC Bank Standard Chartered CandriamIndustries
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149Undisclosed50 - 249 employeesLondon, EnglandSiliconMint is a San Francisco, California-based software development firm. Launched in 2012, the team focuses on Custom Software Development and Web Development.Read More
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150Undisclosed10 - 49 employeesLondon, EnglandCan Factory is a software development firm. In London, England, their team provides Custom Software Development and Mobile App Development.Read More
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