Top 100 Software Development Companies in Seattle
The Best of December 2025List of the Best Seattle Software Developers
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$10,000+10 - 49 employeesIrvine, CAKingsmen Digital Ventures is a software development firm. Their small team is located in Irvine, California. The firm specializes in Custom Software Development, Mobile App Development, UX/UI Design, E-Commerce Development, and more.Read More
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$25,000+10 - 49 employeesMedina, WAFlower Press Interactive is a small user experience agency launched in 2001. Their team offers UX/UI Design, Mobile App Development, Custom Software Development, Web Development, and more. The company is located in Medina, Washington.Read More
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$10,000+10 - 49 employeesJohannesburg, South AfricaRead More
Mobile application development firm CubeZoo was established in 2011. In Johannesburg, South Africa and London, England, their small team specializes in Mobile App Development, Web Development, Artificial Intelligence, UX/UI Design, and more.
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1$50,000+250 - 999 employeesKyiv, UkraineLocated in Tallinn, Estonia; Kharkiv, Ukraine; Stuttgart, Germany and London, England, Jelvix is a software development company. The midsize agency was established in 2011. Their services include Custom Software Development, Mobile App Development, Artificial Intelligence, and cloud consulting & SI.Read More
Clients
Tiber Capital GroupIndustries
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2$25,000+10 - 49 employeesSeattle, WAFounded in 2010, Bilberrry is a custom software development firm. They are in Seattle, Washington and have a small team. The firm offers Custom Software Development, IT staff augmentation, Web Design, Web Development, and more.Read More
Clients
Days for GirlsIndustries
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3$10,000+250 - 999 employeesBellevue, WARead More
Affirma Consulting is a custom software development firm established in 2001. Their midsize team is in Bellevue, Washington; Ahmedabad, India; Dublin, Ireland and Fayetteville, Arkansas. The firm focuses on Custom Software Development, AI Consulting, Generative AI, Mobile App Development, and more.
Clients
MicrosoftIndustries
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4$5,000+50 - 249 employeesSeattle, WAWeb design agency UPQODE was launched in 2015. They are based in Nashville, Tennessee; New York, New York; Tampa, Florida and Seattle, Washington and have a midsize team. UPQODE focuses on Web Design, Web Development, UX/UI Design, Custom Software Development, and more.Read More
Clients
Gracenote - Entertainment ProvidersIndustries
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5$25,000+250 - 999 employeesKirkland, WANearsure, a Nortal company is an IT strategy consulting company. They focus on IT strategy consulting, IT staff augmentation, IT managed services, Custom Software Development, and more and were founded in 2000. Their midsize team is headquartered in Montevideo, Uruguay; Kirkland, Washington; Envigado, Colombia and Sao Paulo, Brazil.Read More
Clients
Health CatalystIndustries
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6$5,000+10 - 49 employeesStockholm, SwedenRead More
Slashdev is a small custom software development firm based in Winter Park, Florida; London, England; Stockholm, Sweden and San Diego, California. They specialize in Custom Software Development, Web Development, Mobile App Development, IT staff augmentation, and more and were founded in 2020.
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7$25,000+10 - 49 employeesSeattle, WARead More
UpTop is a small UX company. Founded in 2000, the team offers UX/UI Design, Custom Software Development, and Mobile App Development. The firm is based in Seattle, Washington.
Clients
Amazon F5 SAP Concur LogitixIndustries
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8$25,000+10 - 49 employeesSeattle, WACulture Foundry is a web design agency. They focus on Web Design, Web Development, Digital Strategy, Custom Software Development, and more and were established in 2010. Their small team is located in Seattle, Washington; Boulder, Colorado; Austin, Texas and Portland, Oregon.Read More
Clients
24 Hour FitnessIndustries
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9$25,000+50 - 249 employeesSeattle, WAMobcoder, an IT staff augmentation company, is located in Seattle, Washington; Cobham, England; Ghaziabad, India and Burnaby, Canada. The midsize company was launched in 2014. Their services include IT staff augmentation, Artificial Intelligence, UX/UI Design, BI & big data consulting & SI, and more.Read More
Clients
General millsIndustries
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10$50,000+10 - 49 employeesSeattle, WAATOMICUS, a custom software development firm, was launched in 1999. They are in Seattle, Washington and Gdańsk, Poland and have a small team. Their services include custom software development.Read More
Clients
BRUKER CAMECA AMETEK Hitachi High-TechIndustries
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11$50,000+50 - 249 employeesSeattle, WAThirstySprout is an IT staff augmentation company. They are based in Seattle, Washington; San Francisco, California; Austin, Texas and Buenos Aires, Argentina and have a midsize team. The company provides IT staff augmentation, Generative AI, Custom Software Development, Web Development, and more.Read More
Clients
Rover.comIndustries
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12$10,000+10,000+ employeesBellevue, WABeyondsoft Consulting Inc., an IT strategy consulting company, is located in Bellevue, Washington. They provide IT strategy consulting, BI & big data consulting & SI, cloud consulting & SI, Custom Software Development, and more and were founded in 1995.Read More
Clients
HPIndustries
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13$5,000+250 - 999 employeesKirkland, WAEstablished in 2005, UKAD is an IT staff augmentation company. Their midsize team is located in Kirkland, Washington; Kraków, Poland; Kharkiv, Ukraine and Cesson-Sévigné, France and focuses on IT staff augmentation, E-Commerce Development, Low/No Code Development, Custom Software Development, and more.Read More
Clients
AJ Produkter Ginza TargetAid EntitledToIndustries
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14$25,000+2 - 9 employeesSeattle, WARead More
Lunarbyte.io is a development agency based in Seattle. Since 2019, the 3-person team has built websites, custom software, and mobile apps for predominantly small businesses.
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DDM ImportsIndustries
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15$25,000+2 - 9 employeesSeattle, WABlack Antelope, a website development company, was established in 2009. Headquartered in Seattle, Washington, their small team focuses on Web Development, UX/UI Design, Custom Software Development, E-Commerce Development, and more.Read More
Clients
UC Berkeley (Berkeley, CA)Industries
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16$25,000+10 - 49 employeesMedina, WAFlower Press Interactive is a small user experience agency launched in 2001. Their team offers UX/UI Design, Mobile App Development, Custom Software Development, Web Development, and more. The company is located in Medina, Washington.Read More
Clients
Insurance LoungeIndustries
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17$25,000+50 - 249 employeesSeattle, WARead More
Tecla, an IT staff augmentation company, was launched in 2013. The agency offers IT staff augmentation, Staffing, Custom Software Development, and Web Development and has a midsize team.
Clients
Mercedes-BenzIndustries
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18$10,000+50 - 249 employeesKirkland, WARead More
Founded in 2013, AccelOne is an artificial intelligence firm. They are headquartered in Kirkland, Washington; Buenos Aires, Argentina and Mission Viejo, California and have a midsize team. The firm offers Artificial Intelligence, Generative AI, IT managed services, IT staff augmentation, and more.
Clients
XapoIndustries
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19Undisclosed1,000 - 9,999 employeesL'viv, UkraineRoom 8 Group, an app development firm, was founded in 2011. They specializes in Mobile App Development and Custom Software Development.Read More
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20$5,000+50 - 249 employeesSeattle, WAHeadquartered in Seattle, Washington; Yerevan, Armenia and Almaty, Kazakhstan, Innova is a big data analytics company. The midsize agency was established in 2021. Their services include BI & big data consulting & SI, cloud consulting & SI, IT managed services, Custom Software Development, and more.Read More
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21Undisclosed50 - 249 employeesSeattle, WARead More
Smashing Ideas is a mobile app development company that offers an array of services such as UI/UX design, web design, data strategy and analytics, and quality assurance and testing. Since its founding in 1996, Smashing Ideas has grown to over 50 employees who are passionate, curious, and creative.
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22$1,000+1,000 - 9,999 employeesSalt Lake City, UTInsight Global, a big data analytics company, provides BI & big data consulting & SI and cloud consulting & SI. The firm is located in Atlanta, Georgia and Birmingham, Alabama.Read More
Industries
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23$10,000+2 - 9 employeesSeattle, WALaunched in 2023, Matey is a small web design agency. Their team specializes in web design, ux/ui design, product design, web development, and more. The agency is in Seattle, Washington.Read More
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24$25,000+2 - 9 employeesSeattle, WARead More
Northwest Independent Ruby Development is a digital agency based in Seattle. Since 2011, the small team of four has specialized in providing web and custom software development.
Clients
University of Washington -
25$10,000+50 - 249 employeesBellevue, WARead More
Virtuosity Consulting, a custom software development firm, was launched in 2008. They are located in Bellevue, Washington and Navi Mumbai, India and have a midsize team. Their services include custom software development, IT managed services, enterprise app modernization, web development, and more.
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26$50,000+10 - 49 employeesSeattle, WARead More
New Normal, founded in 2012, is a software services agency headquartered in Seattle. Their company consists of a team of 22 people who specialize in web development, mobile app development, and e-commerce development. While they mostly work with mid-market businesses, they also work with enterprise and small businesses. The businesses they work with are mostly in the advertising & marketing, e-commerce, and financial services industries.
Clients
AmazonIndustries
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27$5,000+50 - 249 employeesClyde Hill, WAGrowth Natives is a SEO agency. They are located in Clyde Hill, Washington and Sahibzada Ajit Singh Nagar, India and have a midsize team that offers Search Engine Optimization, Account-Based Marketing, Email Marketing, Web Design, and more. The company was established in 2019.Read More
Clients
LeventmIndustries
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28$5,000+10 - 49 employeesBellevue, WARead More
Scalex Technology Solutions is a digital agency founded in Bellevue, Wash. in 2015 with fewer than 50 employees. They specialize in cloud consulting, mobile app development, and custom software development for clients in the fields of education, financial, and IT services.
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World VisionIndustries
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29$25,000+10,000+ employeesKraków, PolandPersistent Systems is a data analytics company. Established in 1990, the large agency is headquartered in Pune, India; Santa Clara, California; Paris, France and Lyne, England. Their services include BI & big data consulting & SI, cloud consulting & SI, Cybersecurity, Custom Software Development, and more.Read More
Industries
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30$5,000+10,000+ employeesSan Francisco, CAGlobant is a large web development firm. They offer Web Development and Custom Software Development and were founded in 2003.Read More
Clients
Google
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