Top Software Development Companies in Washington State
We ranked 12 software development companies in Washington State on client reviews, how many are verified, service focus and profile completeness. Updated October 2026. How rankings work
Teams that design, build and maintain software, from web and mobile apps to the internal systems a business runs on.
- Rank 1
Kirkland, Washington software firm building HIPAA-compliant healthcare systems, EHR integrations and AI products for health-tech companies.
No reviews yet
Kirkland, WA
- Custom Software Development
- API & Integration Development
- AI & Automation
- Rank 2
Seattle digital agency designing and developing websites, headless commerce, web and mobile applications, and AI-enabled features.
No reviews yet
Seattle, WA
- Web Development
- Mobile App Development
- AI & Automation
- Team
- 10-49 people
- Rank 3
Vancouver, Washington software shop building custom web applications and mobile apps, with an in-house QA group and Linux managed services.
No reviews yet
Vancouver, WA
- Web Development
- Mobile App Development
- Custom Software Development
- Rank 4
Vancouver, Washington software firm delivering product builds, custom business applications and web and mobile apps through its own global offices.
No reviews yet
Vancouver, WA
- Custom Software Development
- Mobile App Development
- Web Development
- Rank 5
Seattle software firm building custom business applications, mobile apps and system integrations, and modernizing and supporting existing software.
No reviews yet
Seattle, WA
- Custom Software Development
- Mobile App Development
- API & Integration Development
- Rank 6
App and AI development agency with a Redmond office, building mobile apps and agentic AI products for mid-market and enterprise companies.
No reviews yet
Redmond, WA
- AI & Automation
- Mobile App Development
- Product Design & Development
- Team
- 100-249 people
- Rank 7
Seattle studio that plans, builds, deploys and operates custom software and applied AI systems for growing companies.
No reviews yet
Seattle, WA
- Custom Software Development
- AI & Automation
- Product Design & Development
- Rank 8
Digital agency that plans, designs, develops, hosts and supports websites and web applications built on WordPress, Drupal and Django.
No reviews yet
Seattle, WA
- Web Development
- UX/UI Design
- Custom Software Development
- Rank 9
Seattle-area studio that designs, builds, tests, launches and maintains native iOS and Android apps for startups and large companies.
No reviews yet
Issaquah, WA
- Mobile App Development
- UX/UI Design
- Rank 10
Seattle interactive studio creating mobile apps, games, websites and video for consumer, entertainment and technology brands.
No reviews yet
Seattle, WA
- Mobile App Development
- Web Development
- UX/UI Design
- Rank 11
Bellevue firm that pairs strategy, experience design, software, hardware and AI engineering to take products from concept to launch.
No reviews yet
Bellevue, WA
- Product Design & Development
- Custom Software Development
- AI & Automation
- Team
- 250-999 people
- Rank 12
Seattle UX modernization firm that researches, designs and builds updated systems, portals and workflows for service-driven organizations.
No reviews yet
Seattle, WA
- Product Design & Development
- UX/UI Design
- Custom Software Development
Not sure who to choose?
Tell us about your project and we’ll introduce you to up to three software development companies in Washington State that fit it. It’s free.