Company lists · Data refreshed September 2026

Top 25 Custom software development firms based in Ireland

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

Compiled by the RevenueBase Data Team Data refreshed Sep 1, 2026 140 companies tracked

RevenueBase identified 140 custom software development firms headquartered in Ireland as of September 2026 and tracks 1,077 professional contacts across them, including 415 with verified work emails and 198 with mobile numbers. Dublin is the largest hub.

This list covers custom software development firms headquartered in Ireland, 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

140Companies

1,077Contacts tracked

415Verified emails

198Mobile numbers

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest custom software development firms based in Ireland

Ranked by team size

Top 25 of 140 custom software development firms based in Ireland, 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	Affirma	Indirect evidence	Dublin, Ireland	501-1,000	406 contacts →
	Indirect evidence “Affirma is an award-winning full service technology services firm based out of Bellevue, WA.” Source: RevenueBase Database · checked Sep 1, 2026
2	Shark Software	Strong evidence	Dublin, Ireland	11-50	42 contacts →
	Strong evidence “Shark Software is an IT company offering web and mobile development services to the international market since 2016.” Source: RevenueBase Database · checked Sep 1, 2026
3	Dataworks Limited	Partial evidence	Waterford, Ireland	11-50	41 contacts →
	Partial evidence “Dataworks applies technology to drive real change, improved efficiencies and cost reduction for its customers.” Source: RevenueBase Database · checked Sep 1, 2026
4	Ardanis	Partial evidence	Dublin, Ireland	51-200	37 contacts →
	Partial evidence “Ardanis has been delivering innovative software solutions to progressive, digital organisations in the UK and Ireland since 2016.” Source: RevenueBase Database · checked Sep 1, 2026
5	Drupart	Indirect evidence	Dublin, Ireland	11-50	28 contacts →
	Indirect evidence “As we navigate the ever-changing dynamics of the digital age, Drupart consistently pushes beyond technological boundaries.” Source: RevenueBase Database · checked Sep 1, 2026
6	ISC Software Solutions LTD	Strong evidence	Ireland	11-50	27 contacts →
	Strong evidence “We offer a comprehensive range of consulting, custom software development and support services to assist customers to improve efficiencies through automating processes, accessing…” Source: RevenueBase Database · checked Sep 1, 2026
7	3035tech	Indirect evidence	Ireland	11-50	27 contacts →
	Indirect evidence “We are experts in building unique web and mobile application that perfectly match our clients’ objectives.” Source: RevenueBase Database · checked Sep 1, 2026
8	Devensis	Partial evidence	Ireland	11-50	21 contacts →
	Partial evidence “At Devensis, we don’t just develop software-we create solutions that transform businesses.” Source: RevenueBase Database · checked Sep 1, 2026
9	Inventise	Strong evidence	Bray, Ireland	11-50	20 contacts →
	Strong evidence “Inventise specialise in enterprise custom software developments ranging from accessible, engaging and intuitive websites and webapps to complex online corporate CRM solutions…” Source: RevenueBase Database · checked Sep 1, 2026
10	Perfutil Technologies	Partial evidence	Dublin, Ireland	11-50	15 contacts →
	Partial evidence “At Perfutil, we are committed to offering top-notch software solutions, seamlessly blending superior quality with cost-efficiency tailored to your business needs Our diverse team…” Source: RevenueBase Database · checked Sep 1, 2026
11	Avaeon Solutions	Partial evidence	Parkmore, Ireland	11-50	14 contacts →
	Partial evidence “Established in 2001, Avaeon is a wholly owned Irish software company based in Galway, Ireland.” Source: RevenueBase Database · checked Sep 1, 2026
12	APP Design	Partial evidence	Galway, Ireland	11-50	13 contacts →
	Partial evidence “App Design is an Irish app development company that serves clients from a variety of different countries and industries.” Source: RevenueBase Database · checked Sep 1, 2026
13	Grafton Digital	Strong evidence	Galway, Ireland	11-50	11 contacts →
	Strong evidence “Grafton Digital is an Award-Winning Website, Custom software Solutions & Mobile App Development Company.” Source: RevenueBase Database · checked Sep 1, 2026
14	Demarq	Partial evidence	Ireland	11-50	10 contacts →
	Partial evidence “Demarq is an independent solutions consultancy providing bespoke applications to our growing customer base.” Source: RevenueBase Database · checked Sep 1, 2026
15	threadable.io	Indirect evidence	Dublin, Ireland	11-50	9 contacts →
	Indirect evidence “We work with the pioneers, risk takers, innovators and disruptors taking on the next great commercial and technical challenges.” Source: RevenueBase Database · checked Sep 1, 2026
16	Dovetail Technologies LTD	Partial evidence	Dublin, Ireland	11-50	7 contacts →
	Partial evidence “Dovetail is a specialist provider of custom IT solutions.” Source: RevenueBase Database · checked Sep 1, 2026
17	Devhaus	Strong evidence	Gorey, Ireland	11-50	7 contacts →
	Strong evidence “We build hardworking software products your customers will love.” Source: RevenueBase Database · checked Sep 1, 2026
18	Greenfinch Technology LTD	Strong evidence	Dublin, Ireland	11-50	7 contacts →
	Strong evidence “Greenfinch Technology, part of the TEKenable Group, is a Dublin based software development company focused on solving business problems with innovative technology.” Source: RevenueBase Database · checked Sep 1, 2026
19	Bestsoft Consulting LTD	Partial evidence	Dublin, Ireland	11-50	6 contacts →
	Partial evidence “BestSoft Consulting is a SITECORE partner - we proud to partner with SiteCore to give our customers the opportunity of leading technology matched with leading consulting team.” Source: RevenueBase Database · checked Sep 1, 2026
20	Purpledecks	Indirect evidence	Ireland	11-50	6 contacts →
	Indirect evidence “We help Unlock your organisation's potential and bring your vision to life with our comprehensive end-to-end digital services, seamlessly transforming your core technology and…” Source: RevenueBase Database · checked Sep 1, 2026
21	Squarebreed	Strong evidence	Ireland	1-10	6 contacts →
	Strong evidence “We are a full-fledged IT Services, Consultancy, Software, web application, Mobile app development company.” Source: RevenueBase Database · checked Sep 1, 2026
22	Jalmia Solutions	Indirect evidence	Tubbercurry, Ireland	1-10	4 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 1, 2026
23	Happen Software	Partial evidence	Dublin, Ireland	1-10	4 contacts →
	Partial evidence “We have a proven track record of delivering epic world-class business software.” Source: RevenueBase Database · checked Sep 1, 2026
24	Square Root Solutions	Partial evidence	Kilkenny, Ireland	11-50	4 contacts →
	Partial evidence “Square Root Solutions is an award-winning app development company, named App Development Company of the Year in both 2022 and 2023.” Source: RevenueBase Database · checked Sep 1, 2026
25	Metric	Indirect evidence	Ireland	1-10	4 contacts →
	Indirect evidence “Metric combine design and bespoke programming to offer a variety of digital solutions for your company.” 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 140 custom software development firms based in Ireland

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 415 reachable decision-makers.

Free signup · no credit card

View the full list →

Custom software development firms based in Ireland at a glance

As of Sep 1, 2026

38.5%Verified-email coverage

18.4%Mobile-number coverage

7.7Average contacts per company

1-10Median size (employees)

37.9%Largest-city concentration · Dublin

Sep 1, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

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 Ireland 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 Ireland 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, 415 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 Dublin53

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 Ireland?

RevenueBase identified 140 custom software development firms headquartered in Ireland 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?

Affirma, headquartered in Dublin, tops this list with the largest team on record.

Which city has the most custom software development firms?

Dublin leads with 53 headquartered companies, followed by Galway (6) and Cork (3).

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 415 verified decision-maker contacts tracked across these 140 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.

Ready to reach these companies? Verified emails and direct dials for all 140 custom software development firms based in Ireland. Start with a free account, no credit card.

Download this list →

Related lists

Custom software development firms by geography

Browse the directory

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.