Company lists · Data refreshed September 2026

Top 25 Custom software development startups based in San Diego, United States

Name: Custom software development startups based in San Diego, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 109 companies tracked

RevenueBase identified 109 custom software development startups headquartered in San Diego, United States as of September 2026 and tracks 2,261 professional contacts across them, including 586 with verified work emails. Across the United States, New York is the largest hub for this category (566 companies); San Diego has 109.

This list covers custom software development startups headquartered in San Diego, United States, 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 29, 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 HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 29, 2026 86% judged on-target in blind review

109Companies

2,261Contacts tracked

586Verified emails

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The 25 largest custom software development startups based in San Diego, United States

Ranked by team size

Top 25 of 109 custom software development startups based in San Diego, United States, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to custom software development startups: 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	Arkusnexus	Strong evidence	San Diego, CA, United StatesHQ checked Sep 29, 2026	201-500	305 contacts →
	Strong evidence “At ArkusNexus, we're revolutionizing nearshore software development by integrating cutting-edge AI throughout our entire development lifecycle.” Source: RevenueBase Database · checked Sep 29, 2026
2	Integrant, INC	Partial evidence	San Diego, CA, United StatesHQ checked Sep 29, 2026	201-500	280 contacts →
	Partial evidence “For more than 35 years, Integrant has engineered enterprise software for companies that can’t afford to get it wrong, in medical devices, life sciences, pharma, financial…” Source: RevenueBase Database · checked Sep 29, 2026
3	Bitcot	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 29, 2026	201-500	264 contacts →
	Indirect evidence “Bitcot launched in 2014 as the vision of one man armed with a laptop.” Source: RevenueBase Database · checked Sep 29, 2026
4	Sysintelli Software And Services Private Limited	Strong evidence	San Diego, CA, United StatesHQ checked Sep 29, 2026	51-200	81 contacts →
	Strong evidence “Sysintelli, founded in early 2005, as a software development and consulting firm, has now evolved to providing whole array of services and solutions in Application Development…” Source: RevenueBase Database · checked Sep 29, 2026
5	Primero Systems	Strong evidence	San Diego, CA, United StatesHQ checked Sep 29, 2026	51-200	59 contacts →
	Strong evidence “Primero Systems is a custom software development company focused on building and supporting enterprise applications for complex business environments.” Source: RevenueBase Database · checked Sep 29, 2026
6	Creative Software International	Strong evidence	San Diego, CA, United StatesHQ checked Sep 29, 2026	51-200	38 contacts →
	Strong evidence “Creative Software International provides software development and engineering support through a nearshore model built for teams that need to scale without disrupting delivery.” Source: RevenueBase Database · checked Sep 29, 2026
7	Jeannypr Softech Pvt. LTD	Strong evidence	San Diego, CA, United StatesHQ checked Sep 29, 2026	11-50	36 contacts →
	Strong evidence “Jeannypr Softech is an IT product and services company and offers a full range of web, mobile & software development solutions.” Source: RevenueBase Database · checked Sep 29, 2026
8	Fuerza Studio	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 29, 2026	11-50	35 contacts →
	Indirect evidence “Fuerza Studio was founded in 2010.” Source: RevenueBase Database · checked Sep 29, 2026
9	Royanis	Partial evidence	San Diego, United StatesHQ checked Sep 29, 2026	11-50	32 contacts →
	Partial evidence “Royanis is a company that specializes in solving software and data related challenges, turning ideas into web, cloud or mobile based digital software products that can scale to…” Source: RevenueBase Database · checked Sep 29, 2026
10	Tateeda Global	Strong evidence	San Diego, CA, United StatesHQ checked Sep 29, 2026	51-200	31 contacts →
	Strong evidence “TATEEDA GLOBAL, a custom software development company and staff augmentation provider, boasts a talent pool of over 100 experienced engineers.” Source: RevenueBase Database · checked Sep 29, 2026
11	Shubh Solutions LLC	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 29, 2026	51-200	26 contacts →
	Indirect evidence “Shubh Solutions is an Information Technology(IT) company, providing enterprise solutions to bridge disparate work groups, IT systems, and business processes.” Source: RevenueBase Database · checked Sep 29, 2026
12	I2a Solutions INC	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 29, 2026	11-50	25 contacts →
	Indirect evidence “At i2a Solutions, we transform our client’s ideas into innovative applications and solutions that deliver a high business impact.” Source: RevenueBase Database · checked Sep 29, 2026
13	Natural Networks, INC	Partial evidence	San Diego, CA, United StatesHQ checked Sep 29, 2026	11-50	24 contacts →
	Partial evidence “Natural Networks specializes in combining sound business strategies with cutting edge technologies to provide effective and comprehensive enterprise solutions for our customers.” Source: RevenueBase Database · checked Sep 29, 2026
14	Border UX	Partial evidence	San Diego, CA, United StatesHQ checked Sep 29, 2026	11-50	22 contacts →
	Partial evidence “Border UX: UX strategy, design systems, and research engines for enterprise software.” Source: RevenueBase Database · checked Sep 29, 2026
15	Webcentriq	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 29, 2026	51-200	21 contacts →
	Indirect evidence “We specialize in digital innovation and transformation.” Source: RevenueBase Database · checked Sep 29, 2026
16	Swazei	Strong evidence	San Diego, CA, United StatesHQ checked Sep 29, 2026	11-50	20 contacts →
	Strong evidence “Software Design and Development Platform with a passion to create intuitive products.” Source: RevenueBase Database · checked Sep 29, 2026
17	Fusion Media Solutions, INC	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 29, 2026	11-50	16 contacts →
	Indirect evidence “We specialize in the creation of sophisticated and engaging web and mobile solutions for innovative clients around the world.” Source: RevenueBase Database · checked Sep 29, 2026
18	Search Rebel LLC	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 29, 2026	11-50	16 contacts →
	Indirect evidence “Embrace Disruption.” Source: RevenueBase Database · checked Sep 29, 2026
19	Digital Crafters	Partial evidence	San Diego, CA, United StatesHQ checked Sep 29, 2026	51-200	15 contacts →
	Partial evidence “Digital Crafters is a web design and development company and we believe in providing high-quality value-added IT solutions to our clients.” Source: RevenueBase Database · checked Sep 29, 2026
20	Sunrise Apps	Partial evidence	San Diego, CA, United StatesHQ checked Sep 29, 2026	51-200	15 contacts →
	Partial evidence “Sunrise Apps is a US-registered mobile & web development company.” Source: RevenueBase Database · checked Sep 29, 2026
21	Ifline Technologies	Partial evidence	San Diego, United StatesHQ checked Sep 29, 2026	11-50	14 contacts →
	Partial evidence “IFLINE Software will assist your company in constituting new opportunities for enhancement by greatly diminishing the costs attributed in managing web and software applications.” Source: RevenueBase Database · checked Sep 29, 2026
22	SD Sharp	Strong evidence	San Diego, CA, United StatesHQ checked Sep 29, 2026	11-50	13 contacts →
	Strong evidence “SD Sharp is a boutique Software Development agency with one of the best Dev Teams in California.” Source: RevenueBase Database · checked Sep 29, 2026
23	ESR Tech	Partial evidence	San Diego, CA, United StatesHQ checked Sep 29, 2026	11-50	12 contacts →
	Partial evidence “We build software and applications, as well as provide consultation to small and medium-sized businesses on process automation, data science, data security and other aspects of…” Source: RevenueBase Database · checked Sep 29, 2026
24	Barefoot Solutions	Strong evidence	San Diego, CA, United StatesHQ checked Sep 29, 2026	11-50	11 contacts →
	Strong evidence “Based in San Diego, Barefoot Solutions is an innovative custom web and mobile application development company.” Source: RevenueBase Database · checked Sep 29, 2026
25	Innoworx	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 29, 2026	11-50	10 contacts →
	Indirect evidence “InnoWorx is an IT solutions company delivering end-to-end technology services from strategy consulting to implementation and long-term support.” Source: RevenueBase Database · checked Sep 29, 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 startups. 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 startups.
Partial evidence: Its own public description names part of custom software development startups, 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 startups. 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 109 custom software development startups based in San Diego, United States

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Custom software development startups based in San Diego, United States at a glance

As of Sep 29, 2026

25.9%Verified-email coverage

20.7Average contacts per company

11-50Median size (employees)

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

Email recency for this list is measured across the whole United States list rather than for San Diego, so it is reported there. Company counts and contact totals on this page are exact for San Diego, over 109 companies.

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 startups, 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 San Diego, United States whose own description of what they do matches “custom software development startups”. 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 startups), 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 startups, and records with no verified work email. Companies headquartered outside San Diego 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, 586 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 29, 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 startups by metro in the United States

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 startups, 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 startups are there based in San Diego, United States?

RevenueBase identified 109 custom software development startups headquartered in San Diego, United States 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?

Arkusnexus, headquartered in San Diego, tops this list with the largest team on record.

Which city in the United States has the most custom software development startups?

New York leads the United States with 566 headquartered companies, followed by Austin (351) and Houston (252). San Diego has 109.

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 586 verified decision-maker contacts tracked across these 109 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 29, 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.