Company lists · Data refreshed September 2026

Top 25 Contract software developers based in Seattle, United States

Name: Contract 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 86 companies tracked

RevenueBase identified 86 contract software developers headquartered in Seattle, United States as of September 2026 and tracks 539 professional contacts across them, including 195 with verified work emails. Across the United States, New York is the largest hub for this category (491 companies); Seattle has 86.

This list covers contract 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

86Companies

539Contacts tracked

195Verified emails

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The 25 largest contract software developers based in Seattle, United States

Ranked by team size

Top 25 of 86 contract 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 contract 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	Janea Systems	Partial evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	51-200	60 contacts →
	Partial evidence “For over two decades, Janea Systems has provided high impact software development services to Fortune 500 companies.” Source: RevenueBase Database · checked Sep 29, 2026
3	Exit83 Consulting	Partial evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	51-200	25 contacts →
	Partial evidence “Since 2007, EXIT83 Consulting has been assisting companies with Website Development, Software Architecture, Mobile Application Development, Business Analysis and Fundraising…” Source: RevenueBase Database · checked Sep 29, 2026
4	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
5	NEW Normal	Partial evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	11-50	25 contacts →
	Partial 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
6	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
7	EXP Technical, INC	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	11-50	19 contacts →
	Indirect evidence “Founded in 2003, EXP makes people’s lives easier and more productive, through collaborative relationships with our clients and community We can provide a complete outsourced IT…” Source: RevenueBase Database · checked Sep 29, 2026
8	GENUI	Partial evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	11-50	13 contacts →
	Partial evidence “What sets GenUI apart is an end-to-end product focus throughout all our experience design and software development services.” Source: RevenueBase Database · checked Sep 29, 2026
9	Itrellis, LLC	Partial evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	11-50	13 contacts →
	Partial 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	Partial evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	1-10	12 contacts →
	Partial 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	Gols INC	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	11-50	7 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 29, 2026
14	Pythonwise INC	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	11-50	6 contacts →
	Indirect evidence “Pythonwise Inc is leading provider of Information Technology consulting and business process services.” 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	Zuhly Technologies	Partial evidence	Seattle, United StatesHQ checked Sep 29, 2026	11-50	4 contacts →
	Partial evidence “Software Development and Consulting.” Source: RevenueBase Database · checked Sep 29, 2026
18	Zaifworks LLC	Partial evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	1-10	4 contacts →
	Partial 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
19	Instrumental Group	Partial evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	1-10	3 contacts →
	Partial evidence “We are your software team for hire: four industry veterans with decades of cross-platform experience who have worked together for over a decade to launch products, run agencies…” Source: RevenueBase Database · checked Sep 29, 2026
20	Rogue POD LLC	Partial evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	1-10	2 contacts →
	Partial evidence “Rogue Pod has over 20 years combined experience in custom software development.” Source: RevenueBase Database · checked Sep 29, 2026
21	Webonyx	Partial evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	11-50	2 contacts →
	Partial evidence “WebOnyx is a software development company that specializes in building custom software.” Source: RevenueBase Database · checked Sep 29, 2026
22	dev.co	Partial evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	11-50	2 contacts →
	Partial evidence “Established in 2008 as a advertising & financial software consulting firm, DEV.co brings brings over 12 years of successful leadership to custom software development projects…” Source: RevenueBase Database · checked Sep 29, 2026
23	NEW Harbor	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	1-10	2 contacts →
	Indirect evidence “At New Harbor, we specialize in expert IT solutions that empower businesses to reach their full potential.” Source: RevenueBase Database · checked Sep 29, 2026
24	Orahsoft Solutions	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	1-10	1 contacts →
	Indirect evidence “OrahSoft - Solution for all your computer needs.” Source: RevenueBase Database · checked Sep 29, 2026
25	Buddio Tech	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 29, 2026	1-10	1 contacts →
	Indirect evidence “Buddio Tech build mobile apps.” 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: contract 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 contract software developers.
Partial evidence: Its own public description names part of contract software developers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name contract 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 86 contract software developers based in Seattle, United States

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Contract software developers based in Seattle, United States at a glance

As of Sep 29, 2026

36.2%Verified-email coverage

6.3Average contacts per company

1-10Median size (employees)

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

501-1,000

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 86 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 contract 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 “contract 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 contract 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 contract 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, 195 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.

Contract 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 contract 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 contract software developers are there based in Seattle, United States?

RevenueBase identified 86 contract 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 contract software developers?

New York leads the United States with 491 headquartered companies, followed by Austin (320) and Houston (243). Seattle has 86.

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 195 verified decision-maker contacts tracked across these 86 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.