Company lists · Data refreshed September 2026

Top 25 Custom software development firms based in the United Kingdom

Name: Custom software development firms based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 1, 2026 3,218 companies tracked

RevenueBase identified 3,218 custom software development firms headquartered in the United Kingdom as of September 2026 and tracks 25,493 professional contacts across them, including 5,797 with verified work emails and 1,030 with mobile numbers. London is the largest hub.

This list covers custom software development firms headquartered in the United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 1, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list RevenueBase Smart Search rating on every row Refreshed Sep 1, 2026 86% judged on-target in blind review

3,218Companies

25,493Contacts tracked

5,797Verified emails

1,030Mobile numbers

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The 25 largest custom software development firms based in the United Kingdom

Ranked by team size

Top 25 of 3,218 custom software development firms based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 1, 2026. RevenueBase Smart Search rates how each company's information relates to custom software development firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	BBD	Partial evidence	London, United Kingdom	1,001-5,000	1,220 contacts →
	Partial evidence “Welcome to BBD – where experience, innovation and software engineering excellence come together.” Source: RevenueBase Database · checked Sep 1, 2026
2	Softteco	Strong evidence	Loughborough, United Kingdom	501-1,000	539 contacts →
	Strong evidence “SoftTeco is a software development company that was founded in 2008 providing custom software development services.” Source: RevenueBase Database · checked Sep 1, 2026
3	Scott Logic	Partial evidence	Bristol, United Kingdom	201-500	392 contacts →
	Partial evidence “At Scott Logic, we design and build software that transforms the performance of some of the world’s biggest and most demanding organisations.” Source: RevenueBase Database · checked Sep 1, 2026
4	Biztech Consulting & Solutions	Indirect evidence	Ruislip Ruislip, United Kingdom	201-500	317 contacts →
	Indirect evidence “With over 19+ years of experience and 1200+ successful projects, BiztechCS is an ISO 27001 and ISO 9001 certified company.” Source: RevenueBase Database · checked Sep 1, 2026
5	Mallow Technologies Private Limited	Indirect evidence	London, United Kingdom	51-200	315 contacts →
	Indirect evidence “We are renowned for our creativity, invention and innovation.” Source: RevenueBase Database · checked Sep 1, 2026
6	Fiftyfive Technologies	Strong evidence	London, United Kingdom	201-500	247 contacts →
	Strong evidence “FiftyFive is a global software development and technology consulting company, delivering full-cycle digital solutions across industries and geographies.” Source: RevenueBase Database · checked Sep 1, 2026
7	Mobcoder	Partial evidence	Surrey, United Kingdom	201-500	233 contacts →
	Partial evidence “Mobcoder acts as a trusted digital transformation partner for startups and enterprises, enabling technology-driven disruption through the development of intuitive, scalable, and…” Source: RevenueBase Database · checked Sep 1, 2026
8	Dreamztech Solutions	Strong evidence	Watford, United Kingdom	201-500	227 contacts →
	Strong evidence “DreamzTech – Engineering the Future of Digital Transformation - For over 15 years, DreamzTech has been a global leader in next-gen software development, where innovation meets…” Source: RevenueBase Database · checked Sep 1, 2026
9	Emizen Tech	Indirect evidence	London, United Kingdom	201-500	207 contacts →
	Indirect evidence “EmizenTech, a leading digital solutions provider, stands tall in a competitive landscape, backed by a wealth of expertise and experience.” Source: RevenueBase Database · checked Sep 1, 2026
10	Sphinx Solutions Pvt. LTD	Indirect evidence	London, United Kingdom	201-500	205 contacts →
	Indirect evidence “Headquartered in India, Sphinx Solutions is an esteemed US-based digital transformation company, renowned for its massive reach in providing bespoke digital IT solutions globally.” Source: RevenueBase Database · checked Sep 1, 2026
11	Kanhasoft	Partial evidence	London, United Kingdom	51-200	130 contacts →
	Partial evidence “KanhaSoft – AI-Driven Web, Mobile & SaaS Development for Global Businesses With 13+ years of proven experience and an unmatched record of 100% positive client feedback, KanhaSoft…” Source: RevenueBase Database · checked Sep 1, 2026
12	Naimuri	Strong evidence	Salford Manchester, United Kingdom	51-200	118 contacts →
	Strong evidence “We are Naimuri, a software development house, based in Manchester, specialising in data intelligence solutions.” Source: RevenueBase Database · checked Sep 1, 2026
13	Devico Solutions	Partial evidence	London, United Kingdom	201-500	118 contacts →
	Partial evidence “Devico delivers faster results for you and your customers.” Source: RevenueBase Database · checked Sep 1, 2026
14	Imriel Technology Solutions Private LTD	Strong evidence	London, United Kingdom	201-500	108 contacts →
	Strong evidence “IMRIEL, an Allata company, combines Allata's leadership in AI and digital excellence with IMRIEL's distinguished software development expertise across the UK and India.” Source: RevenueBase Database · checked Sep 1, 2026
15	DTC Infotech Pvt. LTD	Indirect evidence	London, United Kingdom	201-500	104 contacts →
	Indirect evidence “DTC Infotech – Data Driven Intelligence!” Source: RevenueBase Database · checked Sep 1, 2026
16	Saratoga Software	Strong evidence	Worcester, United Kingdom	51-200	91 contacts →
	Strong evidence “We provide quality software development services and solve complex technology problems for organisations as a trusted delivery partner.” Source: RevenueBase Database · checked Sep 1, 2026
17	PDMS	Strong evidence	Braddan, United Kingdom	51-200	91 contacts →
	Strong evidence “PDMS is a technology company providing software development and digital transformation services.” Source: RevenueBase Database · checked Sep 1, 2026
18	Ghyston	Partial evidence	West Bristol, United Kingdom	51-200	61 contacts →
	Partial evidence “Ghyston is an award-winning UK software company based in Bristol.” Source: RevenueBase Database · checked Sep 1, 2026
19	Gemba Advantage	Partial evidence	London, United Kingdom	51-200	60 contacts →
	Partial evidence “Gemba Advantage make high-impact software that is secure, scalable and sustainable.” Source: RevenueBase Database · checked Sep 1, 2026
20	3i-Vision	Strong evidence	London, United Kingdom	51-200	59 contacts →
	Strong evidence “3i-Vision company was Founded in 2012, 3i-Vision is a provider of IT consulting services and custom software development with IT professionals.” Source: RevenueBase Database · checked Sep 1, 2026
21	Phenologix	Strong evidence	Coulsdon, United Kingdom	51-200	58 contacts →
	Strong evidence “Phenologix helps startups, SMBs, and enterprises automate operations, build scalable software, and accelerate growth with AI, RPA, and custom digital solutions.” Source: RevenueBase Database · checked Sep 1, 2026
22	Pikes Soft	Indirect evidence	Dunstable, United Kingdom	51-200	57 contacts →
	Indirect evidence “We are engineering centric and agile followers.” Source: RevenueBase Database · checked Sep 1, 2026
23	Deveire	Indirect evidence	Londonderry, United Kingdom	51-200	56 contacts →
	Indirect evidence “Deveire creates bespoke digital solutions that transform your business world.” Source: RevenueBase Database · checked Sep 1, 2026
24	Cmolds	Strong evidence	Pendlebury Manchester, United Kingdom	501-1,000	55 contacts →
	Strong evidence “CMOLDS is a tech development company founded in 2016, focused on building mobile and web applications, UX/UI design systems, and custom software solutions.” Source: RevenueBase Database · checked Sep 1, 2026
25	Loginet International	Strong evidence	London, United Kingdom	51-200	52 contacts →
	Strong evidence “LogiNet International is a custom web and mobile development agency, helping startups & enterprises build robust web and mobile apps since 2008.” Source: RevenueBase Database · checked Sep 1, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: custom software development firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names custom software development firms.
Partial evidence: Its own public description names part of custom software development firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name custom software development firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 3,218 custom software development firms based in the United Kingdom

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Custom software development firms based in the United Kingdom at a glance

As of Sep 1, 2026

22.7%Verified-email coverage

4.0%Mobile-number coverage

7.9Average contacts per company

1-10Median size (employees)

35.9%Largest-city concentration · London

Sep 1, 2026Page data refreshed

Companies by employee count

1-10

1,991

11-50

915

51-200

211

201-500

501-1,000

1,001-5,000

5,001-10,000

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among custom software development firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United Kingdom whose own description of what they do matches “custom software development firms”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names custom software development firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among custom software development firms, and records with no verified work email. Companies headquartered outside United Kingdom are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 5,797 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 1, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Custom software development firms by metro

Custom software development firms in London1156
Custom software development firms in Manchester107
Custom software development firms in Birmingham68
Custom software development firms in Bristol46
Custom software development firms in Leeds40
Custom software development firms in Glasgow37
Custom software development firms in Edinburgh34

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names custom software development firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many custom software development firms are there based in the United Kingdom?

RevenueBase identified 3,218 custom software development firms headquartered in the United Kingdom as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

BBD, headquartered in London, tops this list with the largest team on record.

Which city has the most custom software development firms?

London leads with 1156 headquartered companies, followed by Manchester (107) and Birmingham (68).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 5,797 verified decision-maker contacts tracked across these 3,218 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 1, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.