Best Washington .Net Development Companies

9 Companies - Rankings updated: August 30, 2026

Every agency on DesignRush meets evaluation criteria around expertise and client feedback to empower informed choices. Some listings include paid partnerships.

.Net
Software & IT Services
All Client Types
Sort by: Sponsored
United States × Washington ×

  • Sigma Software

    Superior Business Solutions

    Sigma Software specializes in developing software and is a globally distributed team of more than 2000 skilled IT professionals, spanning 12 countries including the USA, Sweden, UK, Canada, Israel, Singapore, UAE, Australia, Austria, Ukraine, and more. With a track record of over 20 successful years, we take...

    Top Services:

    • Software Development
    • Web Design
    • Mobile App Development
    • VR/AR
    • Business Consulting
    • Show more
    Location
    Bellevue, Washington
    Number of Employees
    1000 & Up
    Average Hourly Rate
    $40/hr
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    14 Projects Listed

    Sigma Software Services

    • Software Development
    • Web Design
    • Mobile App Development
    • VR/AR
    • Business Consulting
    • Web Development
    • UI/UX Design
    • Cybersecurity
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Knorr-Bremse
    • AstraZeneca
    • Volvo Penta
    • SAS
    • Fortum
    • Mindvalley
    • Aol.
    • IGT
    • Viaplay
    • DanAds
    Data sourced from the agency's DesignRush profile

    Sigma Software Reviews & Testimonials

    • Nikita Vershinin
      Nikita Vershinin VP of Engineering at Ankorstore
      5.0 ★

      Software Development Review from Nikita Vershinin

      We've partnered with Sigma Software for almost three years, and they proved to be a strong partner with whom we'll keep working. Their adaptability and willingness to get things done are unique, setting them apart from other providers. Moreover, they demonstrate a strong sense of ownership.

    • Michael Meyer
      Michael Meyer Managing director at trendwaerts GmbH
      5.0 ★

      Software Development Review from Michael Meyer

      We were so positively surpised and happy about Sigmas services - as usual I might add. It is a pleasure working with their software engineers. After we provided a briefing, the effort estimation came right away. Shortly after the project started we could see first tangible results. The code quality was excellent and comprehensive. Minor feedback was implemented right away. What can I say more: 10 out of 10 points!

    • Esther Howard
      Esther Howard Founder / CEO at Bezyl
      5.0 ★

      Mobile App Development Review from Esther Howard

      The client is incredibly happy with Sigma's services and work. It has referred 3 other clients who also say how much they really love the team and process to get set up with the agency. Sigma is a fantastic company with excellent experienced professionals. Its experts care about quality and customer satisfaction, and they operate like the internal team's extension. (Verified via email)

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
    Visit Website View Profile
    4.6 4.6 (4)
    4.8 4.8 (81)

  • NTSprint LLC

    Maximizing Ideas

    NTSprint helps U.S. businesses accelerate growth through AI-powered software, dedicated nearshore engineering teams, and scalable cloud solutions. With 10+ years of experience and 500+ projects delivered, we provide real-time collaboration, faster delivery, and measurable business impact...

    Top Services:

    • Software Development
    • AI Development
    • Cloud Consulting
    • Web Development
    • Mobile App Development
    • Show more
    Location
    Bothell, Washington
    Number of Employees
    100 - 249
    Average Hourly Rate
    $40/hr
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    13 Projects Listed

    NTSprint LLC Services

    • Software Development
    • AI Development
    • Cloud Consulting
    • Web Development
    • Mobile App Development
    • eCommerce Development
    • Staff Augmentation
    • DevOps Consulting
    • Web Design
    • Software Testing
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Lexus
    • Microsoft
    • Unitii
    Data sourced from the agency's DesignRush profile

    NTSprint LLC Reviews & Testimonials

    • Leniecer Gonzalez Gandara
      Leniecer Gonzalez Gandara Review from Google
      5.0 ★

      Leniecer Gonzalez Gandara's Review Sourced from Google

      I've had the pleasure of working with NTSprint for our custom web application development, and I can confidently say they exceeded all expectations. From the initial consultation to deployment, their team demonstrated exceptional professionalism, technical expertise, and genuine commitment to our project's success.

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
    Visit Website View Profile
    5.0 5.0 (2)

  • ICODA

    All-in-One Crypto & Blockchain Marketing Agency

    ICODA is a Digital Agency. We have been working on the crypto industry market since 2017 and have already participated in the launch of 50+ international projects...

    Top Services:

    • Digital Marketing
    • CRO
    • SEO
    • Social Media Marketing
    • Blockchain
    • Show more
    Location
    Bellevue, Washington
    Number of Employees
    Under 49
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    13 Projects Listed

    ICODA Services

    • Digital Marketing
    • CRO
    • SEO
    • Social Media Marketing
    • Blockchain
    • Web Design
    • Web Development
    • Branding
    • PPC
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • TON
    • Floki
    • BingX
    • Filecoin
    • BC.GAME
    • Huobi Global
    • BOSAGORA
    • SaferMoon
    • ABCC
    • Vabble
    Data sourced from the agency's DesignRush profile

    ICODA Reviews & Testimonials

    • Клим Шилов
      Клим Шилов Review from Google
      5.0 ★

      Клим Шилов's Review Sourced from Google

      Our co-operation with ICODA Digital Agency has been extremely positive. ICODA has supported us in the creation of graphics, advertising materials and print materials and has always shown the highest level of professionalism and reliability. We were particularly impressed by the creative design of the posters, which were not only innovative but also perfectly tailored to our needs. We can recommend ICODA without reservation and look forward to future projects with this dedicated team.

    • Daniel Ostin
      Daniel Ostin Review from Google
      5.0 ★

      Daniel Ostin's Review Sourced from Google

      We contacted this agency for help in promoting a project from the FinTech sphere. We are very grateful for the competent approach, comprehensive analytics and consulting on strategic issues! In addition, ICODA professionally provided a service for working with influencers, advertising traffic and maintaining social networks. Thank you!

    • Ethan Lee
      Ethan Lee Review from Google
      5.0 ★

      Ethan Lee's Review Sourced from Google

      ICODA offers an outstanding experience, setting itself apart with unparalleled expertise and excellence in the industry. Their network of relationships and PR contacts is truly top-tier, making them a reliable partner for achieving exceptional results. Their services stand out for being trustworthy and consistently delivered with the highest quality standards, ensuring client satisfaction every step of the way.

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
    Visit Website View Profile
    5.0 5.0 (5)

  • Ataira Analytics Inc

    Cloud Software and Data Analytics.

    A US Based, Veteran Owned and Operated (SDVOSB), Microsoft Partner and Cloud Solution Provider. Serving Government, Public, and Private Organizations with Business Reporting Consulting Solutions, Security and Migration Services, and Cloud Management and Productivity Software...

    Top Services:

    • Big Data Analytics
    • Managed Services
    • Cloud Consulting
    • Software Development
    • Web Development
    • Show more
    Location
    Gig Harbor, Washington
    Number of Employees
    Under 49
    Average Hourly Rate
    $60/hr
    Minimal Budget
    $1,000 - $10,000

    Ataira Analytics Inc Services

    • Big Data Analytics
    • Managed Services
    • Cloud Consulting
    • Software Development
    • Web Development
    • AI Development
    • Business Consulting
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • National Aeronautics and Space Administration
    • U.S. Department of Health and Human Services
    • U.S. Department of Transportation
    Data sourced from the agency's DesignRush profile
    Visit Website View Profile

  • Sam's Solution

    Software Application Masters.

    Sam's Solution is a dynamic software company specializing in custom software, web and mobile app development, IT consulting, and digital transformation. We deliver innovative, tailored tech solutions that help businesses streamline operations, boost efficiency, and achieve their strategic goals...

    Top Services:

    • Mobile App Development
    • Web Development
    • AI Development
    • Digital Marketing
    • eCommerce Development
    • Show more
    Location
    Seattle, Washington
    Number of Employees
    Under 49
    Average Hourly Rate
    $30/hr
    Portfolios Count
    8 Projects Listed

    Sam's Solution Services

    • Mobile App Development
    • Web Development
    • AI Development
    • Digital Marketing
    • eCommerce Development
    • Graphic Design
    • SEO
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Oui Meet
    • YEP Nation
    • MindHealth Psychological Services
    • Pill Locker
    • Eddipanion LTD.
    • Moneylit
    • Nexsoft Technology Ltd.
    • Fleetwood Specialty Pharmacy
    • Bhawani Properties & Developers
    Data sourced from the agency's DesignRush profile
    Visit Website View Profile

  • 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...

    Top Services:

    • Software Development
    • Mobile App Development
    • Blockchain
    • UI/UX Design
    • eCommerce Development
    • Show more
    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
    • HSBC
    • Xapo
    • University of Washington
    • Pan American Energy SL
    • Cartoon Network
    Data sourced from the agency's DesignRush profile

    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.

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
    Visit Website View Profile
    4.2 4.2 (5)

  • 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)

  • Softech Systems Pvt Limited

    Transforming Ideas into Innovation: A Holistic Services Provider You Can Trust

    Softech Systems has been delivering excellence to the world since 1998. We have served every continent with our expert services and competence. For utmost satisfaction of our clients, we ensure tailored and contemporary services...

    Top Services:

    • Software Development
    • Software Testing
    • Cloud Consulting
    • Digital Marketing
    • SEO
    • Show more
    Location
    Virginia, Washington
    Number of Employees
    100 - 249
    Average Hourly Rate
    $35/hr

    Softech Systems Pvt Limited Services

    • Software Development
    • Software Testing
    • Cloud Consulting
    • Digital Marketing
    • SEO
    • Social Media Marketing
    • BPO
    • Staff Augmentation
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Nestlé
    • Facelift
    • Ericsson
    • Databank
    • Calbank
    • J.P. Morgan
    • Ogoul Technology
    • VAF Compliance
    • Fidelity Bank
    • Stanlib
    Data sourced from the agency's DesignRush profile
    Visit Website View Profile

  • Persistent

    See Beyond, Rise Above.

    Persistent Systems, a renowned global leader in software product development and technology services. Delve into our innovative offerings to stay ahead in the ever-evolving landscape of technology...

    Top Services:

    • AI Development
    • Software Development
    • Web Development
    • Mobile App Development
    • Blockchain
    • Show more
    Location
    Bellevue, Washington
    Number of Employees
    1000 & Up
    Average Hourly Rate
    $100/hr
    Minimal Budget
    $50,000 & Up

    Persistent Services

    • AI Development
    • Software Development
    • Web Development
    • Mobile App Development
    • Blockchain
    • Cybersecurity
    • Managed Services
    • IT Services
    • Big Data Analytics
    • Cloud Consulting
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • GB Bank
    • Qapita
    • Vermont
    Data sourced from the agency's DesignRush profile

    Persistent Reviews & Testimonials

    • Sundeep Patel
      Sundeep Patel Review from Google
      5.0 ★

      Sundeep Patel's Review Sourced from Google

      Persistent Systems Ltd is a global software company that provides innovative software solutions to clients worldwide. The Bhageerath office is one of the company's offices located in Pune, India. As an employee of Persistent Systems Ltd, I have had the opportunity to work at this office and experience its work culture, facilities, and environment. Work Culture: The work culture at Persistent Systems Ltd Bhageerath office is excellent. The company values its employees and provides a supportive environment that encourages creativity, innovation, and collaboration. The office has an open-door policy, and employees are encouraged to share their ideas and opinions freely. The management is approachable and provides ample opportunities for career growth and development. Facilities: The Bhageerath office has excellent facilities that cater to the needs of its employees. The office is spacious and well-equipped with state-of-the-art technology and infrastructure. The office has a modern cafeteria that serves a variety of delicious food and beverages. The office also has a gymnasium, a recreation room, and a meditation center, which are available to employees to use during their free time. Environment: The environment at Persistent Systems Ltd Bhageerath office is conducive to work. The office is located in a peaceful and quiet area, away from the hustle and bustle of the city. The office is surrounded by lush greenery and has a beautiful view of the nearby hills. The office has an eco-friendly policy and encourages its employees to adopt sustainable practices. Employee Experience: As an employee of Persistent Systems Ltd Bhageerath office, my experience has been excellent. The company provides a supportive and inclusive work environment that values its employees. The facilities and amenities provided by the company are top-notch, which makes it a great place to work. The company also provides ample opportunities for career growth and development. Conclusion: In conclusion, Persistent Systems Ltd Bhageerath office is a great place to work. The work culture is excellent, and the company values its employees. The facilities and amenities provided by the company are top-notch, which makes it a comfortable and enjoyable place to work. The environment is conducive to work, which makes it an ideal location for an office. Overall, it is a highly recommended place to work.

    • Harshad N
      Harshad N Review from Google
      5.0 ★

      Harshad N's Review Sourced from Google

      Well known IT company in Pune. Founded and managed by Dr Deshpande. Persistent family known for their social service along with the core business in IT sector..

    • Praveen Soni
      Praveen Soni Review from Google
      5.0 ★

      Praveen Soni's Review Sourced from Google

      One of the best IT company in pune. Location and offices are best. Personally I likes the name of buildings.

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
    Visit Website View Profile
    4.6 4.6 (730)

Related Services in Washington

Related Software Development Specializations in Washington

Popular Services

Latest Trends Related to .Net Development

Onshore vs offshore software development
Software Development

Onshore vs. Offshore Software Development Company: Which One Is a Better Choice?

2,531
Questions To Ask a Software Development Agency
Software Development

10 Questions To Ask a Software Development Agency Before Hiring

2,348
In-House vs. Outsourcing Software Development
Software Development

In-House vs. Outsourcing Software Development: What to Choose for Your Company

2,657

Receive Free Proposals

For your project

1

Specify your budget, timeline and project requirements

2

Our experts curate a list of up to 5 most qualified candidate agencies

3

We connect you with them so you can choose the most suitable partner

Specify your requirements