Company lists · Data refreshed September 2026

Top 25 Software contractors based in Seattle, United States

Name: Software contractors based in Seattle, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 6, 2026 314 companies tracked

RevenueBase identified 314 software contractors headquartered in Seattle, United States as of September 2026 and tracks 14,650 professional contacts across them, including 9,504 with verified work emails. New York is the largest hub.

This list covers software contractors 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 6, 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 6, 2026 86% judged on-target in blind review

314Companies

14,650Contacts tracked

9,504Verified emails

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The 25 largest software contractors based in Seattle, United States

Ranked by team size

Top 25 of 314 software contractors based in Seattle, United States, ranked by team size, largest first. Data refreshed Sep 6, 2026. RevenueBase Smart Search rates how each company's information relates to software contractors: 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	Slalom	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 6, 2026	10001+	10,032 contacts →
	“Slalom is a fiercely human business and technology consulting company that leads with outcomes to bring more value, in all ways, always.” Source: company website · checked Sep 6, 2026
2	Point B	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 6, 2026	501-1,000	656 contacts →
	“At Point B, we help organizations adapt and thrive in a world that refuses to stand still.” Source: company website · checked Sep 6, 2026
3	Blackstone EIT	Partial evidence	Seattle, WA, United StatesHQ checked Sep 6, 2026	1,001-5,000	270 contacts →
	“Blackstone eIT is a leading System Integrator (SI) and Independent Software Vendor (ISV), globally dedicated to engineering transformative enterprise solutions and intelligent…” Source: company website · checked Sep 6, 2026
4	Wimmer Solutions	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 6, 2026	501-1,000	262 contacts →
	“We help you to see the full picture, bringing our experts together with you to co-develop approaches and operationalize plans across the dimension of strategy, people, process…” Source: company website · checked Sep 6, 2026
5	Logic20 20, INC	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 6, 2026	201-500	240 contacts →
	“Headquartered in Seattle with offices nationwide, we've been helping clients address their toughest challenges-and achieve their most ambitious goals-since 2005.” Source: company website · checked Sep 6, 2026
6	Utilicast	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 6, 2026	201-500	181 contacts →
	“Utilicast is more than just a consulting company.” Source: company website · checked Sep 6, 2026
7	Nextec Group	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 6, 2026	51-200	155 contacts →
	“NexTec Group is an award-winning business technology consultancy offering ERP and BI solutions to small and mid-sized businesses.” Source: company website · checked Sep 6, 2026
8	White Rabbit Group	Partial evidence	Seattle, WA, United StatesHQ checked Sep 6, 2026	51-200	135 contacts →
	“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: company website · checked Sep 6, 2026
9	Teleion	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 6, 2026	51-200	127 contacts →
	“Teleion is a Seattle-based company with focus on the following service offerings:* Solutions Development & Content Management * Business Intelligence & Data Management * Risk &…” Source: company website · checked Sep 6, 2026
10	Ukad Umbraco, Optimizely And Azure Solution Partner	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 6, 2026	201-500	123 contacts →
	“UKAD is a helping companies extend engineering capacity and deliver complex solutions with predictable outcomes.” Source: company website · checked Sep 6, 2026
11	Sila Solutions Group	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 6, 2026	51-200	103 contacts →
	“Sila is a technology and management consulting firm that delivers lasting and substantial business solutions to the world’s leading corporations and Federal government agencies.” Source: company website · checked Sep 6, 2026
12	Audax Labs	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 6, 2026	51-200	94 contacts →
	“Audax Labs - Outcome-Driven Innovation!” Source: company website · checked Sep 6, 2026
13	Ntsprint	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 6, 2026	51-200	92 contacts →
	“NTSprint is an IT company founded in the State of Washington, United States, in 2016.” Source: company website · checked Sep 6, 2026
14	H10 Capital	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 6, 2026	201-500	82 contacts →
	“H10 is a Consulting and Project Resources firm headquartered in Seattle, WA.” Source: company website · checked Sep 6, 2026
15	Rythmos	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 6, 2026	201-500	79 contacts →
	“Our Mission.” Source: company website · checked Sep 6, 2026
16	2nd Watch	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 6, 2026	201-500	67 contacts →
	“2nd Watch is now Ollion.” Source: company website · checked Sep 6, 2026
17	Devblock Technologies, INC	Partial evidence	Seattle, WA, United StatesHQ checked Sep 6, 2026	51-200	65 contacts →
	“Devblock is a Global AI Digital Consultancy & Agency providing end to end AI software solutions from ideation and strategy to creative and software development.” Source: company website · checked Sep 6, 2026
18	Cogentsoft Systems	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 6, 2026	51-200	61 contacts →
	“CogentSoft, we provide consulting, technology and business process outsourcing solutions to organizations.” Source: company website · checked Sep 6, 2026
19	Janea Systems	Partial evidence	Seattle, WA, United StatesHQ checked Sep 6, 2026	51-200	60 contacts →
	“For over two decades, Janea Systems has provided high impact software development services to Fortune 500 companies.” Source: company website · checked Sep 6, 2026
20	Envorso	Partial evidence	Seattle, WA, United StatesHQ checked Sep 6, 2026	51-200	51 contacts →
	“At Envorso, we specialize in guiding businesses through the complexities of modern engineering, software, and digital transformation.” Source: company website · checked Sep 6, 2026
21	Datec INC	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 6, 2026	11-50	45 contacts →
	Source: company website · checked Sep 6, 2026
22	Linda Werner & Associates, INC	Indirect evidence	Seattle, United StatesHQ checked Sep 6, 2026	51-200	39 contacts →
	“Linda Werner & Associates is a technology, consulting and technical staffing firm, providing acumen and solutions that include content management, learning, knowledge management…” Source: company website · checked Sep 6, 2026
23	Kuelap, INC	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 6, 2026	51-200	39 contacts →
	Source: company website · checked Sep 6, 2026
24	Spiderbox Design Vietnam	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 6, 2026	51-200	38 contacts →
	“Spiderbox Design - Transforming businesses worldwide with innovative digital solutions since 2011.” Source: company website · checked Sep 6, 2026
25	Greene IS	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 6, 2026	11-50	35 contacts →
	“Full service Information Technology Consulting and Outsourcing for Your Business Greene IS specializes in providing comprehensive computer networking solutions to the small and…” Source: company website · checked Sep 6, 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: software contractors. 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 software contractors.
Partial evidence: Its own public description names part of software contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name software contractors. 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 314 software contractors based in Seattle, United States

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Software contractors based in Seattle, United States at a glance

As of Sep 6, 2026

64.9%Verified-email coverage

46.7Average contacts per company

1-10Median size (employees)

485.0%Largest-city concentration · New York

Sep 6, 2026Page data refreshed

Companies by employee count

1-10

169

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured across the whole United States list rather than this city, so it is reported there. Company counts and contact totals on this page are exact for Seattle, over 314 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 software contractors, 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 “software contractors”. 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 software contractors), 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 software contractors, 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, 9,504 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 6, 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.

Software contractors 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 software contractors, 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 software contractors are there based in Seattle, United States?

RevenueBase identified 314 software contractors 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?

Slalom, headquartered in Seattle, tops this list with the largest team on record.

Which city has the most software contractors?

New York leads with 1523 headquartered companies, followed by Houston (852) and Austin (846).

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 9,504 verified decision-maker contacts tracked across these 314 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 6, 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.