Company lists · Data refreshed November 2026

Top 21 Custom software developers based in Seattle, United States

Name: Custom 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 Nov 6, 2026 56 companies tracked

RevenueBase identified 56 company matches for custom software developers associated with Seattle, United States as of November 2026 and tracks 516 professional contacts across them, including 154 with verified work emails. Across the United States, New York is the largest hub for this category (416 companies); Seattle has 56.

This list covers company matches for custom software developers associated with Seattle, United States, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed November 6, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 SmartSearch · Exact Recorded Nov 6, 2026 How this list was built

56Companies

516Contacts tracked

154Verified emails

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The 21 largest custom software developers based in Seattle, United States

Ranked by team size

Top 21 of 56 company matches for custom software developers based in Seattle, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 6, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	White Rabbit Group	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	51-200	127 contacts →
	Exact match “White Rabbit Group is a software development agency with a highly diverse and creative team that takes an idea through development and into scale.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
2	Janea Systems	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	51-200	83 contacts →
	Exact match “For over two decades, Janea Systems has provided high impact software development services to Fortune 500 companies.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
3	Pubgenius INC	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	11-50	26 contacts →
	Exact match “At pubGENIUS we build software that helps great ideas become real products.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
4	NEW Normal	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	11-50	26 contacts →
	Exact match “NewNormal builds custom software and lasting partnerships Since 2012 we’ve helped clients turn ideas into products that scale.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
5	GENUI	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	11-50	13 contacts →
	Exact match “What sets GenUI apart is an end-to-end product focus throughout all our experience design and software development services.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
6	Lunarbyte	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	1-10	11 contacts →
	Exact match “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.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
7	Gols INC	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	11-50	7 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
8	Pythonwise INC	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	11-50	7 contacts →
	Exact match “Pythonwise Inc is leading provider of Information Technology consulting and business process services.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
9	Swyft ERP Swyfterp.com	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	11-50	5 contacts →
	Exact match “We build custom business software solutions that scale with companies and help streamline business processes and also specialize in NetSuite build/implementation for larger…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
10	Cogenix	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	1-10	4 contacts →
	Exact match “Cogenix offers business consulting, application development and software integration services to our client base.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
11	Zaifworks LLC	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	1-10	4 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
12	Pacific Automation	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	1-10	3 contacts →
	Exact match “We create and deploy tailor-made software solutions aimed at enhancing efficiency and optimizing operations for a diverse range of clients, spanning individuals, businesses…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
13	Instrumental Group	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	1-10	2 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
14	Inner Product LLC	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	1-10	2 contacts →
	Exact match “Inner Product builds great software for the enterprise.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
15	dev.co	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	11-50	2 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
16	Webonyx	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	1-10	2 contacts →
	Exact match “WebOnyx helps companies modernize complex software systems and put AI into production-connecting legacy applications, enterprise APIs, cloud infrastructure, data, and modern AI…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
17	Jcmobtech LLC	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	1-10	2 contacts →
	Exact match “We are Software Engineers that are passionate about converting great ideas into unique and reliable software solutions that helps the business growth.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
18	Blacktee Systems	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	1-10	2 contacts →
	Exact match “Blacktee Systems combines software development skills from both the control systems programming and web application development realms.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
19	DB WEB Forge	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	1-10	1 contacts →
	Exact match “DB Web Forge is a full-service web and software development company with over 14 years of experience that specializes in building custom websites, apps, and software solutions for…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
20	Buddio Tech	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	1-10	1 contacts →
	Exact match “Buddio Tech build mobile apps.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
21	Orahsoft Solutions	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	1-10	1 contacts →
	Exact match “OrahSoft - Solution for all your computer needs.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “custom software developers”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 21 of 56 custom software developers based in Seattle, United States

See the full list, filter by size, metro and specialty, and access 154 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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

As of Nov 6, 2026

29.8%Verified-email coverage

9.2Average contacts per company

1-10Median size (employees)

Nov 6, 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 56 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Company records associated with Seattle, United States whose business descriptions match “custom software developers” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 154 professional contacts with verified work emails across the full matched dataset. 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 November 6, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Custom software developers by metro in the United States

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “custom software developers”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many custom software developers are there based in Seattle, United States?

RevenueBase identified 56 company matches for custom software developers associated with Seattle, United States as of November 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

White Rabbit Group tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

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

New York leads the United States with 416 company records, followed by Austin (250) and Houston (214). Seattle has 56.

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 154 professional contacts with verified work emails tracked across these 56 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on November 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 SmartSearch, 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.