Best IT Outsourcing Companies in Seattle

6 Companies - Rankings updated: April 01, 2026

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

United States × Washington × Seattle ×

  • Zazz

    Modern IT. Built Secure. Delivered Right.

    Zazz is a trusted software engineering and IT services partner helping enterprises deliver secure, scalable, high-impact tech initiatives. We solve complex challengeslegacy bottlenecks, tech debt, talent gaps, compliance risks, and system fragmentation.  [... see all Zazz reviews ]
    Location
    Seattle, Washington
    Number of Employees
    250 - 499
    Average Hourly Rate
    $45/hr
    Portfolios Count
    36 Projects Listed

    Zazz Services

    • Mobile App Development
    • IT Services
    • Software Development
    • Staff Augmentation
    • IT Compliance Solution
    • Cybersecurity
    • Managed Services
    • Cloud Consulting
    • DevOps Consulting
    • Web Development
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts

    Zazz Reviews & Testimonials

    • Sam Zaid
      Sam Zaid CEO at Getaround
      5.0★
      Mobile App Development Review from Sam Zaid

      Their team's technical proficiency and creativity have significantly contributed to the success of our world's first connected carsharing marketplace. Zazz not only met but exceeded our expectations, delivering a seamlessly integrated and user-friendly mobile app that has truly empowered people to carshare everywhere. The collaboration with Zazz has proven to be a valuable partnership, marked by open communication, timely delivery, and a genuine dedication to our mission.

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    • Jay Thrash
      Jay Thrash SENIOR IOS DEVELOPER at Epic Games
      5.0★
      Mobile App Development Review from Jay Thrash

      Their unparalleled expertise and dedication to excellence were evident throughout the entire collaboration. Zazz's team consistently demonstrated a deep understanding of our vision, translating it into a seamless and innovative mobile application. Their commitment to quality and precision in every aspect of the development process was truly impressive. Zazz's ability to navigate complex challenges with agility and deliver solutions that exceeded our expectations was instrumental in the success of our project.

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    • Don Harmon
      Don Harmon Director of Global IT Services at Dorel Juvenile
      5.0★
      Mobile App Development Review from Don Harmon

      Zazz's commitment to delivering a high-quality mobile app for Dorel Juvenile was evident throughout the entire development process. The team consistently communicated progress, promptly addressed any concerns or modifications, and ensured that the final product not only met but exceeded our expectations. The mobile app developed by Zazz not only showcased cutting-edge technology but also reflected a deep understanding of the child-centric focus that Dorel Juvenile upholds.

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    Reviews verified by DesignRush and sourced from the agency's profile
    • JP Morgan
    • BBC News
    • PayPal
    • Harvard Innovation Labs
    • HBO
    • Jeddah Season
    • McDonald's
    • NBA
    • Honda
    • Citibank
    Data sourced from the agency's DesignRush profile
    View Profile
    5.0 5.0 (76)

  • Matellio Inc.

    We Make the Impossible Case Possible.

    Matellio is a leading software engineering studio, recognized globally for delivering intelligent solutions powered by Artificial Intelligence and Machine Learning. We specialize in developing customized AI solutions tailored to various needs of businesses under different industry verticals.  [... see all Matellio Inc. reviews ]
    Location
    Seattle, Washington
    Number of Employees
    250 - 499
    Average Hourly Rate
    $50/hr
    Minimal Budget
    $50,000 & Up
    Portfolios Count
    26 Projects Listed

    Matellio Inc. Services

    • AI Development
    • IoT
    • DevOps Consulting
    • Cloud Consulting
    • Mobile App Development
    • Software Development
    • Web Design
    • Web Development
    • Big Data Analytics
    • Staff Augmentation
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts

    Matellio Inc. Reviews & Testimonials

    • Undisclosed
      Undisclosed CTO at V Card Global
      4.7★
      Web Development Review from Undisclosed

      Matellio is one of the best organizations I have had a chance to work with. Their unique approach to becoming an integrated extension of our corporate programming staff provides us with the ability to design and implement solutions in an ever changing environment.

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    Reviews verified by DesignRush and sourced from the agency's profile
    • Hewlett Packard Enterprise
    • Tracking Genie
    • Brideside
    • Air Fusion
    • vCard Global
    • Codexa
    • PTGI
    • INSPRO
    • NERVVE
    • GoShow
    Data sourced from the agency's DesignRush profile
    View Profile
    4.1 4.1 (1)

  • 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.  [... view Jelvix profile ]
    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
    View Profile

  • 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  [... view Grant Thornton profile ]
    Location
    Seattle, 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

    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.

      Show more
    Reviews verified by DesignRush and sourced from the agency's profile
    • Financial industry
    • Real estate industry
    • Media and Entertainment industry
    Data sourced from the agency's DesignRush profile
    View Profile
    4.5 4.5 (13)

  • AccelOne

    Accelone Advancing What's Possible

    Embark on your digital transformation journey with AccelOne's Software Development delivery model, strategically designed for optimal outcomes. Initiate your digital transformation seamlessly through our comprehensive nearshore and US-based services.  [... view AccelOne profile ]
    Location
    Seattle, Washington
    Number of Employees
    100 - 249
    Minimal Budget
    $25,000 - $50,000
    Portfolios Count
    5 Projects Listed

    AccelOne Services

    • Software Development
    • Mobile App Development
    • Blockchain
    • UI/UX Design
    • eCommerce Development
    • Web Development
    • AI Development
    • Staff Augmentation
    • IT Services
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts

    AccelOne Reviews & Testimonials

    • Gustavo Lemos
      Gustavo Lemos Review from Google
      5.0★

      Gustavo Lemos's Review Sourced from Google

      I've been working in AccelOne for several years already and it's an amazing place to work. Great people and a good variety of clients.

      Show more
    Reviews verified by DesignRush and sourced from the agency's profile
    • HSBC
    • Xapo
    • University of Washington
    • Pan American Energy SL
    • Cartoon Network
    Data sourced from the agency's DesignRush profile
    View Profile
    4.2 4.2 (5)

  • Protiviti

    Global Business Consulting Excellence

    Protiviti is a global consulting firm that offers deep expertise, objective insights, and tailored solutions to empower leaders in tackling future challenges. With a comprehensive range of services spanning finance, technology, operations, data, analytics, governance, risk, and internal audit, we serve  [... view Protiviti profile ]
    Location
    Seattle, Washington
    Number of Employees
    1000 & Up
    Portfolios Count
    5 Projects Listed

    Protiviti Services

    • Business Consulting
    • IT Compliance Solution
    • Big Data Analytics
    • IT Services
    • Cybersecurity
    • AI Development
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts

    Clients and Projects

    View Full Portfolio
    • Finance transformation sets course for future success
      Big Data Analytics Project Finance transformation sets course for future success
    • Change management, automation and new digital tools transform finance operations for educational services company
      Big Data Analytics Project Change management, automation and new digital tools transform finance operations for educational services company
    • Quantum computing helps financial services organization improve portfolio optimization
      Big Data Analytics Project Quantum computing helps financial services organization improve portfolio optimization
    View Full Portfolio
    Comprehensive analysis done by DesignRush Agency Experts.
    • KnowBe4
    • Resolver
    • PowerSchool
    Data sourced from the agency's DesignRush profile
    View Profile
    5.0 5.0 (1)

Related Services in Seattle

About The Author and Expert Reviewer

Content Specialist

selina@designrush.com

Selina Garcia has authored 500+ articles and edited 50+ published books in economics, law, and history. Her unique blend of experiences allows her to approach content creation from a well-rounded perspective. Currently, Selina applies her expertise to producing insightful articles on IT, software, and applications for DesignRush.

Former Development Director

spotlight@designrush.com

Sergio is a technology leader with over six years of experience managing global teams and delivering projects across fintech, sportstech, and B2B platforms. At DesignRush, he drove product growth and development execution, building tools that speed up processes by 95% and cut costs by 35% while maintaining full uptime.

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