DesignRush expert analysts recognized the top software development companies in Washington that create high-performance solutions for businesses of all sizes and across industries. Find the right software development partner based on average project cost, reviews and more.

Best Washington Software Development Firm Rankings

6 Companies - Rankings updated: September 04, 2026

DesignRush assesses agencies using expertise standards and verified client experiences to help you make better decisions. Certain agencies have paid placements.

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United States × Washington × Automotive × Sort by: Avg Hourly Price: Low to High × Clear Filters

  • Grant Thornton

    IT, Business, BPO, Audit, Tax and Advisory are just the beginning.

    Grant Thornton LLP (US) is an IT, project management, audit, tax, AgTech, and BPO company headquartered in Chicago, Illinois with over 50 U.S. offices and access to a global network or member firms in over 135 countries. We offer a broad range of services in strategy and consulting, operations, technology and...

    Top Services:

    • Accounting
    • Business Consulting
    • Market Research
    • HR Outsourcing
    • Software Development
    • Show more
    Location
    Bellevue, Washington
    Number of Employees
    1000 & Up
    Average Hourly Rate
    $35/hr
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    2 Projects Listed

    Grant Thornton Services

    • Accounting
    • Business Consulting
    • Market Research
    • HR Outsourcing
    • Software Development
    • IT Services
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Financial industry
    • Real estate industry
    • Media and Entertainment industry
    Data sourced from the agency's DesignRush profile

    Grant Thornton Reviews & Testimonials

    • Theodore Mall
      Theodore Mall Review from Google
      4.0 ★

      Theodore Mall's Review Sourced from Google

      One of the world’s leading organizations of independent audit, tax and advisory firms. Grant Thornton has revenues in excess of $1.9 billion and operates more than 50 offices.

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
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    4.5 4.5 (13)

  • 9series

    Handcrafted Technology Solutions

    At 9series, we help organizations move beyond traditional software by building intelligent systems powered by AI...

    Top Services:

    • Mobile App Development
    • AI Development
    • IoT
    • Software Development
    • Cloud Consulting
    • Show more
    Location
    Bellevue, Washington
    Number of Employees
    250 - 499
    Average Hourly Rate
    $40/hr
    Portfolios Count
    3 Projects Listed

    9series Services

    • Mobile App Development
    • AI Development
    • IoT
    • Software Development
    • Cloud Consulting
    • DevOps Consulting
    • Digital Services
    • Digital Strategy
    • eCommerce Development
    • Web Development
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • iWayTrack
    • Overlay Planner
    • Product Tube
    Data sourced from the agency's DesignRush profile
    Visit Website View Profile

  • Markup Designs

    Mark your Brand Up

    Global Leader in Mobile App Development & Digital Engineering...

    Top Services:

    • Mobile App Development
    • Software Development
    • Blockchain
    • AI Development
    • IoT
    • Show more
    Location
    Sammamish, Washington
    Number of Employees
    250 - 499
    Average Hourly Rate
    $50/hr
    Minimal Budget
    $1,000 - $10,000

    Markup Designs Services

    • Mobile App Development
    • Software Development
    • Blockchain
    • AI Development
    • IoT
    • Wearables
    • Cloud Consulting
    • Product Design
    • IT Services
    • VR/AR
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Cadee Distillery
    • MD Factor
    • Sports Handicapping
    Data sourced from the agency's DesignRush profile

    Markup Designs Reviews & Testimonials

    • Harshit Sagar
      Harshit Sagar Review from Google
      5.0 ★

      Harshit Sagar's Review Sourced from Google

      What stood out to me about Markup Designs is the people. Everyone I interacted with, from the reception to senior team members, was approachable and professional. There's a real sense of teamwork here, not just a "job" mentality. Great culture.

    • Richa Pathak
      Richa Pathak Review from Google
      4.0 ★

      Richa Pathak's Review Sourced from Google

      Its been 4 months that I have been working at Markup Designs. And the experience of working here is great. The work culture, the colleagues I get to work with, everything is just very good.

    • Diksha Dureja
      Diksha Dureja Review from Google
      5.0 ★

      Diksha Dureja's Review Sourced from Google

      I went to Markup Designs for an interview and had a very good experience. The company is highly professional and well organized. The staff was polite and supportive, and the overall process was smooth. It is a well-maintained organization with a positive environment.

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
    Visit Website View Profile
    4.0 4.0 (152)

  • ELEK+RIK

    High Voltage Code Since 2010

    ELEK+RIK: Web App Development, Mobile App Development for iOS & Android, AI Integration & Development Experts for Long-Term US Projects since 2010...

    Top Services:

    • Mobile App Development
    • Software Development
    • Web Development
    • Blockchain
    • VR/AR
    • Show more
    Location
    Seattle, Washington
    Number of Employees
    Under 49
    Average Hourly Rate
    $60/hr
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    18 Projects Listed

    ELEK+RIK Services

    • Mobile App Development
    • Software Development
    • Web Development
    • Blockchain
    • VR/AR
    • AI Development
    • eCommerce Development
    • Software Testing
    • IT Services
    • WordPress Website Design
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Coca - Cola
    • Mercedes
    • BMW
    • VeChain
    • Sony
    • Nike
    • Toyota
    • Hyundai
    • McDonald's
    • Chang
    Data sourced from the agency's DesignRush profile

    ELEK+RIK Reviews & Testimonials

    • Philip Wilson
      Philip Wilson Managing Director at Premier Automation Ltd
      5.0 ★

      Web Development Review from Philip Wilson

      ELEK+RIK team provided a streamlined process that was both simple and enjoyable. They kept to the budget and communicated well throughout the project. ELEK+RIK comes highly recommended and we would work with ELEK+RIK again if given the opportunity.

    • George McKerrow
      George McKerrow CEO at Ted's Montana Grill
      5.0 ★

      Mobile App Development Review from George McKerrow

      ELEK+RIK has worked on improving our React Native mobile app. We had the skeleton of an app, but they were able to do an end-to-end re-design of each of the main pages. Since then, they`ve successfully implemented around ~20 different features on our mobile app. We share a spec and design, they provide an estimate and occasionally some design options, then when completed create a PR on GitHub. Their code is well-organized, easy to follow, and rarely do we have to go back-and-forth about bugs. They are also excellent communicators - carefully following threads on Slack, effectively communicating design and engineering tradeoffs, and even producing a 10m Loom video walking through a diagram. Their communication is top-notch. They are super easy to work with even though we are on very different time zones. And, I am impressed at the speed and execution of their development.

    • John Riley
      John Riley Executive Vice President at MediaCentric
      5.0 ★

      Web Development Review from John Riley

      ELEK+RIK was tasked with creating a website for our company from scratch. They were professional, communicative, and dedicated to delivering an exceptional website that perfectly captured the essence of our company while exceeding our expectations. They are a talented, reliable, and customer-focused web design and development company that I would highly recommend to anyone.

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
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    4.9 4.9 (19)
    5.0 5.0 (3)

  • Jelvix

    GLOBAL TECH PARTNER FOR DIGITAL TRANSFORMATION AND SOFTWARE INNOVATION

    Jelvix is a global tech partner with 15+ years of experience, empowering industry leaders and startups. With 450+ IT experts, we drive digital transformation across Europe, North America, Nordics, and Southeast Asia...

    Top Services:

    • Software Development
    • Mobile App Development
    • VR/AR
    • AI Development
    • IoT
    • Show more
    Location
    Seattle, Washington
    Number of Employees
    500 - 999
    Average Hourly Rate
    $70/hr
    Portfolios Count
    10 Projects Listed

    Jelvix Services

    • Software Development
    • Mobile App Development
    • VR/AR
    • AI Development
    • IoT
    • Software Testing
    • Big Data Analytics
    • IT Services
    • UI/UX Design
    • CRM Consulting
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • IKEA
    • Auchan
    • Zeiss
    • Stihl
    • Canon
    Data sourced from the agency's DesignRush profile
    Visit Website View Profile

  • Serbyte

    More than a website, a growth engine.

    Serbyte Web Design & Development builds custom websites that function as growth systems, combining web design, Next.js development, SEO, analytics, lead capture, and automation to help businesses turn traffic into leads and sales...

    Top Services:

    • Web Design
    • SEO
    • Web Development
    • Software Development
    • UI/UX Design
    • Show more
    Location
    Kirkland, Washington
    Number of Employees
    Under 49
    Average Hourly Rate
    $75/hr
    Minimal Budget
    $10,000 - $25,000
    Portfolios Count
    6 Projects Listed

    Serbyte Services

    • Web Design
    • SEO
    • Web Development
    • Software Development
    • UI/UX Design
    • Digital Marketing
    • PPC
    • AI Development
    • Design Services
    • Mobile App Development
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Vets Choice Insurance
    • RC Concrete
    • Bespoke Tint & PPF
    • Entitled
    • Iron & Oak
    • Herbanatural CO
    Data sourced from the agency's DesignRush profile

    Serbyte Reviews & Testimonials

    • Kris Meyer
      Kris Meyer Owner at Bespoke Tint & PPF
      5.0 ★

      Small Businesses Website Development Review from Kris Meyer

      Austin rebuilt our website from the ground up and helped turn Bespoke Tint & PPF into one of the top tint brands in Bellevue. The work started with a full redesign of our website, including branding, copywriting, conversion improvements, mobile optimization, and development. The new site immediately performed better and generated more leads after launch. After the website launch, we continued working together on SEO, AI search optimization, paid advertising support, analytics, A/B testing, and ongoing marketing strategy. He also helped improve our review visibility, local search presence, and overall positioning online. What started as a website project became an ongoing growth partnership focused on increasing traffic, leads, and customer acquisition.

    • Jeff Egbert
      Jeff Egbert Review from Google
      5.0 ★

      Jeff Egbert's Review Sourced from Google

      Austin built or website fast.And it works flawless. And he is always available for you to answer any questions. Or solve any problems.great experience.

    • Uffy 666
      Uffy 666 Review from Google
      5.0 ★

      Uffy 666's Review Sourced from Google

      very innovative and solid work. this service is invaluable in the climate of an ever evolving digital landscape. will definitely be coming back again.

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
    Visit Website View Profile
    4.3 4.3 (1)
    5.0 5.0 (8)

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