Company lists · Data verified August 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 Verified Aug 28, 2026 3,218 companies tracked

There are 3,218 custom software development firms headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase 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. Data current as of August 28, 2026.

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 verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	BBD	London	1,001-5,000	1,220	485
2	Softteco	Loughborough	501-1,000	539	247
3	Scott Logic	Bristol	201-500	392	260
4	Biztech Consulting & Solutions	Ruislip Ruislip	201-500	317	10
5	Mallow Technologies Private Limited	London	51-200	315	129
6	Fiftyfive Technologies	London	201-500	247	29
7	Mobcoder	Surrey	201-500	233	77
8	Dreamztech Solutions	Watford	201-500	227	68
9	Emizen Tech	London	201-500	207	19
10	Sphinx Solutions Pvt. LTD	London	201-500	205	51
11	Kanhasoft	London	51-200	130	15
12	Naimuri	Salford Manchester	51-200	118	76
13	Devico Solutions	London	201-500	118	33
14	Imriel Technology Solutions Private LTD	London	201-500	108	68
15	DTC Infotech Pvt. LTD	London	201-500	104	16
16	Saratoga Software	Worcester	51-200	91	52
17	PDMS	Braddan	51-200	91	34
18	Ghyston	West Bristol	51-200	61	38
19	Gemba Advantage	London	51-200	60	46
20	3i-Vision	London	51-200	59	22
21	Phenologix	Coulsdon	51-200	58	2
22	Pikes Soft	Dunstable	51-200	57	15
23	Deveire	Londonderry	51-200	56	32
24	Cmolds	Pendlebury Manchester	501-1,000	55	12
25	Loginet International	London	51-200	52	4

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 Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 1156 HQs

1,030Contacts with mobile numbers

12Emails re-verified in last 30 days

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

Custom software development firms by metro

Metro	Companies
Custom software development firms in London	1156
Custom software development firms in Manchester	107
Custom software development firms in Birmingham	68
Custom software development firms in Bristol	46
Custom software development firms in Leeds	40
Custom software development firms in Glasgow	37
Custom software development firms in Edinburgh	34

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “custom software development firms”, with match quality audited by blind human judging, and headquartered in the United Kingdom.
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: Contact records re-verify on a rolling cadence; 12 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

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

There are 3,218 custom software development firms headquartered in the United Kingdom as of August 2026 (RevenueBase).

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 is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.