Company lists · Data refreshed September 2026

Top 25 Custom cloud software developers based in Seattle, United States

Name: Custom cloud software developers based in Seattle, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 87 companies tracked

RevenueBase identified 87 custom cloud software developers headquartered in Seattle, United States as of September 2026 and tracks 756 professional contacts across them, including 250 with verified work emails. Across the United States, New York is the largest hub for this category (444 companies); Seattle has 87.

This list covers custom cloud software developers headquartered in Seattle, 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

87Companies

756Contacts tracked

250Verified emails

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The 25 largest custom cloud software developers based in Seattle, United States

Ranked by team size

Top 25 of 87 custom cloud software developers based in Seattle, 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 cloud software developers: 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	White Rabbit Group	Partial evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	51-200	135 contacts →
	Partial evidence “White Rabbit Group is a software development agency with a highly diverse and creative team that takes an idea through development and into scale.” Source: RevenueBase Database · checked Sep 29, 2026
2	Ukad Umbraco, Optimizely And Azure Solution Partner	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	201-500	123 contacts →
	Indirect evidence “UKAD is a helping companies extend engineering capacity and deliver complex solutions with predictable outcomes.” Source: RevenueBase Database · checked Sep 29, 2026
3	Audax Labs	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	51-200	94 contacts →
	Indirect evidence “Audax Labs - Outcome-Driven Innovation!” Source: RevenueBase Database · checked Sep 29, 2026
4	2nd Watch	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	201-500	67 contacts →
	Indirect evidence “2nd Watch is now Ollion.” Source: RevenueBase Database · checked Sep 29, 2026
5	Pubgenius INC	Partial evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	11-50	25 contacts →
	Partial evidence “At pubGENIUS we build software that helps great ideas become real products.” Source: RevenueBase Database · checked Sep 29, 2026
6	NEW Normal	Strong evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	11-50	25 contacts →
	Strong evidence “NewNormal builds custom software and lasting partnerships Since 2012 we’ve helped clients turn ideas into products that scale.” Source: RevenueBase Database · checked Sep 29, 2026
7	Broadpoint Group	Indirect evidence	Seattle, United StatesHQ checked Sep 29, 2026	51-200	20 contacts →
	Indirect evidence “BroadPoint Group provides the services to grow your team, augment your staff and guide your company’s technical goals.” Source: RevenueBase Database · checked Sep 29, 2026
8	Pelotech	Partial evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	11-50	17 contacts →
	Partial evidence “We partner with companies, from Fortune 500 giants to mid-sized businesses, to solve complex challenges in cloud migrations, integrations, application development and…” Source: RevenueBase Database · checked Sep 29, 2026
9	Itrellis, LLC	Strong evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	11-50	13 contacts →
	Strong evidence “iTrellis is a Custom Software and Systems Integration consultancy located in Seattle, WA.” Source: RevenueBase Database · checked Sep 29, 2026
10	Qubitsoft	Partial evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	11-50	12 contacts →
	Partial evidence “Qubitsoft is an innovative and creative company that aims to meet its clients’ demands and provide original software solutions.” Source: RevenueBase Database · checked Sep 29, 2026
11	Lunarbyte	Strong evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	1-10	12 contacts →
	Strong evidence “Lunarbyte is a custom software and product development firm trusted by teams across industries to deliver dependable, scalable software solutions that drive real business results.” Source: RevenueBase Database · checked Sep 29, 2026
12	Fostec	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	1-10	8 contacts →
	Indirect evidence “Founded in 1998, Fostec is a client-focused Information Technology consulting firm that designs solutions and provides technical expertise to small and mid-sized businesses…” Source: RevenueBase Database · checked Sep 29, 2026
13	Swyft ERP Swyfterp.com	Strong evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	11-50	7 contacts →
	Strong evidence “We build custom business software solutions that scale with companies and help streamline business processes and also specialize in NetSuite build/implementation for larger…” Source: RevenueBase Database · checked Sep 29, 2026
14	Powder Labs	Partial evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	1-10	5 contacts →
	Partial evidence “Powder Labs is a professional services firm specializing in cutting-edge software solutions, delivering end-to-end, compliant, full-stack solutions.” Source: RevenueBase Database · checked Sep 29, 2026
15	Pacific Automation Group	Partial evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	1-10	4 contacts →
	Partial evidence “We create and deploy tailor-made software solutions aimed at enhancing efficiency and optimizing operations for a diverse range of clients, spanning individuals, businesses…” Source: RevenueBase Database · checked Sep 29, 2026
16	Cogenix	Partial evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	1-10	4 contacts →
	Partial evidence “Cogenix offers business consulting, application development and software integration services to our client base.” Source: RevenueBase Database · checked Sep 29, 2026
17	Zaifworks LLC	Strong evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	1-10	4 contacts →
	Strong evidence “Zaifworks is software development and cloud consulting firm that specializes in healthcare, real-estate and it services industries.* We transform, deploy and support what you are…” Source: RevenueBase Database · checked Sep 29, 2026
18	Activated, INC	Partial evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	1-10	3 contacts →
	Partial evidence “Activated helps technology organizations apply AI across software, infrastructure, security, and product management.” Source: RevenueBase Database · checked Sep 29, 2026
19	ASMBL	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	51-200	3 contacts →
	Indirect evidence “At Assemble, our people are the source of our success.” Source: RevenueBase Database · checked Sep 29, 2026
20	Konstankino Associates	Partial evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	1-10	3 contacts →
	Partial evidence “We utilize Software Development Life Cycle processes to produce web applications with the highest quality and lowest cost in the shortest time.” Source: RevenueBase Database · checked Sep 29, 2026
21	AA Cloud	Partial evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	11-50	2 contacts →
	Partial evidence “Founded in 2014 by a group of young and ambitious tech-entrepreneurs, AA Cloud conceptualizes and implements creative cloud solutions tailored to your specific business needs.” Source: RevenueBase Database · checked Sep 29, 2026
22	Webonyx	Strong evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	11-50	2 contacts →
	Strong evidence “WebOnyx is a software development company that specializes in building custom software.” Source: RevenueBase Database · checked Sep 29, 2026
23	Global IT Solutions	Partial evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	1-10	2 contacts →
	Partial evidence “Global IT Solutions offers outstanding digital solutions tailored for modern businesses, including web and mobile development, digital transformation, AWS cloud services…” Source: RevenueBase Database · checked Sep 29, 2026
24	Navigatorsrvs	Strong evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	11-50	1 contacts →
	Strong evidence “Big Data Just Got Smaller NavigatorSRVS and its subsidiary NavigatorCRE specialize in cloud based data management software serving a multitude of industries including commercial…” Source: RevenueBase Database · checked Sep 29, 2026
25	Aorca IT Services & Software	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	1-10	1 contacts →
	Indirect evidence “At Aorca, we deliver reliable, secure, and strategic IT services designed to help businesses thrive in an increasingly digital world.” 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 cloud software developers. 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 cloud software developers.
Partial evidence: Its own public description names part of custom cloud software developers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name custom cloud software developers. 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 87 custom cloud software developers based in Seattle, United States

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Custom cloud software developers based in Seattle, United States at a glance

As of Sep 29, 2026

33.1%Verified-email coverage

8.7Average contacts per company

1-10Median 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 Seattle, so it is reported there. Company counts and contact totals on this page are exact for Seattle, over 87 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 cloud software developers, 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 Seattle, United States whose own description of what they do matches “custom cloud software developers”. 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 cloud software developers), 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 cloud software developers, and records with no verified work email. Companies headquartered outside Seattle 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, 250 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 cloud software developers 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 cloud software developers, 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 cloud software developers are there based in Seattle, United States?

RevenueBase identified 87 custom cloud software developers headquartered in Seattle, 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?

White Rabbit Group, headquartered in Seattle, tops this list with the largest team on record.

Which city in the United States has the most custom cloud software developers?

New York leads the United States with 444 headquartered companies, followed by Austin (295) and Houston (210). Seattle has 87.

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 250 verified decision-maker contacts tracked across these 87 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.