Best C# Developers in the United States

10 Companies - Rankings updated: September 03, 2026

We evaluate every agency on DesignRush according to expertise credentials and client satisfaction ratings. Some placements are sponsored.

C#
Retail
$50,000 & Up
Sort by: Sponsored
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  • Itransition

    Verified Verified by the DesignRush team for authenticity and credibility.

    Turning Software Ideas Into Reality

    Itransition specializes in assisting startups and medium to large scale businesses with their software solution needs. Our range of services encompasses the entire development lifecycle, from initial business process inquiry and modeling to comprehensive systems engineering...

    Top Services:

    • Software Development
    • IT Services
    • Business Consulting
    • eCommerce Development
    • Cloud Consulting
    • Show more
    Location
    Lakewood, Colorado
    Number of Employees
    1000 & Up
    Average Hourly Rate
    $40/hr
    Minimal Budget
    $50,000 & Up
    Portfolios Count
    8 Projects Listed

    Itransition Services

    • Software Development
    • IT Services
    • Business Consulting
    • eCommerce Development
    • Cloud Consulting
    • Big Data Analytics
    • VR/AR
    • Mobile App Development
    • Web Design
    • ERP Consulting
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • PayPal
    • Adidas
    • Expedia
    • Ebay
    • Philips
    • PepsiCo
    • Xerox
    • LISI AEROSPACE
    • HAI Group
    • Anybill
    Data sourced from the agency's DesignRush profile

    Itransition Reviews & Testimonials

    • Robert Hager
      Robert Hager Chief Business Analyst at Simpson Strong-Tie
      5.0 ★

      Software Development Review from Robert Hager

      Itransition carried out the entire software testing process without a single delay. Despite the remote cooperation, the company ensured ceaseless communication, which indicates a high level of the team’s professionalism and organization.

    • Jimmy Carlisle
      Jimmy Carlisle Director of Audit at Dixon Hughes Goodman LLP
      5.0 ★

      Software Development Review from Jimmy Carlisle

      We needed an in-depth upgrade of the legacy auditing system. We chose Itransition because they swiftly responded to our project requirements and had relevant expertise. The team helped us decide on the solution’s tech stack and designed the new architecture, migrated legacy data, developed new features, and customized the software with extensions. We got a powerful and user-friendly auditing system and were very impressed with the Itransition’s dedication and attention to detail.

    • Shoshana Parker
      Shoshana Parker Senior Computational Biologist at SBH Health System
      5.0 ★

      Software Development Review from Shoshana Parker

      We enjoyed working with Itransition. We needed a solution for transferring health records from our EHR into the data warehouse without losses. We chose Itransition for their experience, portfolio, and past clients’ references, and the team fully met our expectations. They built a custom ETL tool that increased our visibility into clinical data and helped us spot inefficiencies in patient workflows. Needless to say, they also delivered it on time and budget.

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
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    4.6 4.6 (3)

  • Kodevent

    We Build. You Trust.

    Kodevent is a US-based software company providing top AI developers and custom solutions built with GPT-4, Claude, Gemini, and LLaMA. We deliver intelligent software to help you launch, grow, and accelerate your businessfocusing on clear communication and lasting partnerships...

    Top Services:

    • AI Development
    • Web Development
    • Staff Augmentation
    • Software Testing
    • Software Development
    • Show more
    Location
    Sheridan, Wyoming
    Number of Employees
    100 - 249
    Average Hourly Rate
    $50/hr
    Minimal Budget
    $50,000 & Up

    Kodevent Services

    • AI Development
    • Web Development
    • Staff Augmentation
    • Software Testing
    • Software Development
    • Mobile App Development
    • eCommerce Development
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • FoodFork
    • Clasitique
    • Horizons
    • Octisglow
    • Docplay
    Data sourced from the agency's DesignRush profile

    Kodevent Reviews & Testimonials

    • Mica Palmer
      Mica Palmer Chief of Staff at Liquified
      5.0 ★

      Mobile App Development Review from Mica Palmer

      They helped us solve issues. They designed an app for us.High level/quality of client attention and interaction. All communications, information exchages, and client servicing were well-conceived and well-executed. They kept me on my toes to provide them the information they needed from me. They kept excited about the project and, because of that, kept me optimistic and driving toward the success of my project. The culture of coaching and support they provide start-ups. They don't sleep well unless they know you have all the tools and chops to obtain success. I've never seen any other company provide such rich and valuable deliverables along with ingenious and compassionate client support. Kodevent is a beacon of know-how and wisdom in an otherwise dark ocean for any start-up that is hoping for success.

    • Devul Nahar
      Devul Nahar AI Infrastructure Engineer at Cerebras System
      5.0 ★

      eCommerce Development Review from Devul Nahar

      We needed help designing the Frontend pages on my website. Also some design work. Everyday I would assign my Frontend developer some key tasks and deliverables. He would report back to me. An example of key deliverable he did was help design the logic of flow of grading when we have multiple types of questions. They were quick to respond and professional. They had great professionalism, good talent, and good support.

    • Peter Wallace
      Peter Wallace Owner at LATE BLOOMER STUDIO
      5.0 ★

      Web Development Review from Peter Wallace

      Kodevent and their team were always great at communicating with our team. They worked very hard to finish tasks in the allotted time frame. When we had requests or changes, they were always quick to find a superior solution. Our project is still ongoing, but they are waiting on our side of things to complete and go live. I am appreciative of their great communication skills. They were always quick to respond and worked within our time frame.

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
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    4.9 4.9 (15)

  • Geniusee

    Your Partner in AI & Custom Software Excellence

    Geniusee is a U.S.-based AI and software engineering company with delivery hubs in Ukraine and Poland. We help businesses modernize legacy systems and scale faster through AI-powered, cloud-native solutions. Our team of 300+ experts has delivered 200+ projects for clients like Dell and Bloomberg. We...

    Top Services:

    • Software Development
    • Mobile App Development
    • Web Development
    • AI Development
    • Big Data Analytics
    • Show more
    Location
    Austin, Texas
    Number of Employees
    250 - 499
    Average Hourly Rate
    $40/hr
    Minimal Budget
    $50,000 & Up
    Portfolios Count
    11 Projects Listed

    Geniusee Services

    • Software Development
    • Mobile App Development
    • Web Development
    • AI Development
    • Big Data Analytics
    • Product Design
    • Blockchain
    • IoT
    • Software Testing
    • Staff Augmentation
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Zedosh
    • Finance Unlocked
    • RealmFive
    • Pause
    • TradeSmarter
    • Scoove
    • Ajuma
    • Drum
    • Wyzoo
    • Validify
    Data sourced from the agency's DesignRush profile

    Geniusee Reviews & Testimonials

    • Anonymous CEO & Co-Founder at Finance Unlocked
      5.0 ★

      Web Design Review from Anonymous

      Geniusee successfully delivered a robust and high-performing platform with excellent uptime and reliability. Their team consistently meets sprint requirements, aligning seamlessly with the project roadmap. Despite operating remotely, they collaborate effectively with our internal team and ensure smooth execution across all phases of development.

    • Dhruv Ghulati
      Dhruv Ghulati CEO at FactMata
      5.0 ★

      Marketing Analytics Review from Dhruv Ghulati

      Thanks to Geniusee, our data engineering system can now handle multiple data types. The team's workflow was effective in reporting and daily management of Sprints.

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
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    4.5 4.5 (2)

  • Intellectsoft

    We integrate, innovate, and elevate enterprise systems.

    Intellectsoft builds custom software, AI solutions, and dedicated engineering teams for enterprises and fast-growing businesses across the US and UK...

    Top Services:

    • Software Development
    • Mobile App Development
    • Wearables
    • Software Testing
    • Blockchain
    • Show more
    Location
    New York City, New York
    Number of Employees
    100 - 249
    Average Hourly Rate
    $80/hr
    Minimal Budget
    $50,000 & Up
    Portfolios Count
    12 Projects Listed

    Intellectsoft Services

    • Software Development
    • Mobile App Development
    • Wearables
    • Software Testing
    • Blockchain
    • AI Development
    • UI/UX Design
    • Big Data Analytics
    • IT Services
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Harley-Davidson
    • the London Stock Exchange
    • Ernst & Young
    • Qualcomm
    • Bombardier
    Data sourced from the agency's DesignRush profile

    Intellectsoft Reviews & Testimonials

    • Harshal Chhajed
      Harshal Chhajed Undisclosed at Undisclosed
      4.5 ★

      Software Development Review from Harshal Chhajed

      They have highly skilled support staff for faster resolution which leads to customer satisfaction. Also, it has many features including IoT and blockchain apart from regular software development. If there are any changes in the scope of the project at a later stage, it can prove quite costly and also difficult to accommodate last-minute client-side scripting changes. They are versatile, cost-effective, and offer quick customer support. They offer a very customized software development tool where business needs can be addressed. It is very cost-optimized and hence can help generate good returns for business investment.

    • Vitaly Dyachenko
      Vitaly Dyachenko CEO and Founder at UppLabs LLC
      5.0 ★

      Software Development Review from Vitaly Dyachenko

      Intellectsoft provided a great partnership by delivering quality services and working fast. They helped us to accomplish all the clients' projects on time. The team communicated transparently and showed [] great dedication. They were an ideal partner! (Verified via email)

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
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    4.3 4.3 (2)

  • CHI

    Together, beyond expectations

    CHI Software is a technology solution provider that offers a full set of software-based services from custom software development to maintenance & support. Our talented team is passionate about Generative AI, Cloud Computing, Data Engineering, and IoT. CHI's success comes from care of every client...

    Top Services:

    • AI Development
    • Mobile App Development
    • Software Development
    • Web Development
    • Staff Augmentation
    • Show more
    Location
    Philadelphia, Pennsylvania
    Number of Employees
    500 - 999
    Average Hourly Rate
    $60/hr
    Minimal Budget
    $50,000 & Up
    Portfolios Count
    12 Projects Listed

    CHI Services

    • AI Development
    • Mobile App Development
    • Software Development
    • Web Development
    • Staff Augmentation
    • Software Testing
    • IoT
    • Big Data Analytics
    • IT Services
    • DevOps Consulting
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Vodafone
    • Lecre
    • Media Mrkt
    Data sourced from the agency's DesignRush profile

    CHI Reviews & Testimonials

    • David Gornshtein
      David Gornshtein Co-Founder at Binadox
      5.0 ★

      Web Development Review from David Gornshtein

      My company was looking for a development team to proceed with the development process. We needed to set up a service [that] allows our clients to monitor, control, and optimize their Cloud & SaaS spend. [The] CHI Software team delivered services and technologies we need[ed] to reach our financial goals. (Verified via email)

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
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    4.3 4.3 (1)

  • Waverley

    30 Years of Excellence in Delivering Future-Proof Software Solutions

    Delivering world-class products to Fortune 500 companies and cutting-edge startups for over three decades, we have navigated every economic climate, optimizing production costs to provide our clients with exceptional ROI...

    Top Services:

    • Software Development
    • IoT
    • AI Development
    • Wearables
    • Mobile App Development
    • Show more
    Location
    Palo Alto, California
    Number of Employees
    250 - 499
    Average Hourly Rate
    $50/hr
    Minimal Budget
    $50,000 & Up
    Portfolios Count
    4 Projects Listed

    Waverley Services

    • Software Development
    • IoT
    • AI Development
    • Wearables
    • Mobile App Development
    • Web Development
    • Web Design
    • Business Consulting
    • Cloud Consulting
    • DevOps Consulting
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Matrixx Software
    • ZOTT
    • Jibo
    • Addus Homecare
    • Boomerang Carnets
    • Mozilla
    • Gridpoint
    • Seagate
    • Swiss.com
    • TripIt
    Data sourced from the agency's DesignRush profile

    Waverley Reviews & Testimonials

    • Christi Kambs
      Christi Kambs Review from Google
      5.0 ★

      Christi Kambs's Review Sourced from Google

      Had such great care here, all of the nurses were kind and friendly, I completely felt safe and listened to by the anesthesiologist and Dr Roost was excellent at explaining my procedure and clearly passionate and skilled in her field. Clearly no none wants to have a colonoscopy but their staff made it as easy and smooth as possible!

    • Shellie Cloud
      Shellie Cloud Review from Google
      5.0 ★

      Shellie Cloud's Review Sourced from Google

      The staff exuded warmth and professionalism, making me feel welcomed and at ease. Their accommodating nature helped create a soothing atmosphere. Dr. Lieu was not only highly skilled but also radiated a calming presence, allowing me to feel completely relaxed and confident in my procedure.

    • Ruby LI
      Ruby LI Review from Google
      5.0 ★

      Ruby LI's Review Sourced from Google

      I was pleased with the services I received in the Waverley surgery center for my much procrastinated colonoscopy. Everyone was friendly, caring and attentive which made me feel comfortable and relaxed. Everything went smoothly, they gave clear instructions for after procedure and called next day to make sure everything was all right. I highly recommend it.

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
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    4.9 4.9 (511)

  • Switch Software Solutions

    A lifelong partner to solve any tech challenge together

    Hi there! We were expecting you! We are a nearshore software services and consulting company that partners with forward-thinking companies to achieve their business goals and accelerate growth in the digital age. We are seen as a lifelong partner for tackling any tech challenge...

    Top Services:

    • Software Development
    • Mobile App Development
    • IT Services
    • UI/UX Design
    • Web Development
    • Show more
    Location
    Austin, Texas
    Number of Employees
    100 - 249
    Average Hourly Rate
    $70/hr
    Minimal Budget
    $50,000 & Up
    Portfolios Count
    1 Project Listed

    Switch Software Solutions Services

    • Software Development
    • Mobile App Development
    • IT Services
    • UI/UX Design
    • Web Development
    • Software Testing
    • AI Development
    • VR/AR
    • Cloud Consulting
    • DevOps Consulting
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Penske Logistics
    • Santander Consumer
    • Zenus Bank
    • Verifone
    • BBVA Bank
    • Axletree
    • Oddissey
    • BCIE
    • Sodexo
    • Allied World
    Data sourced from the agency's DesignRush profile

    Switch Software Solutions Reviews & Testimonials

    • Hernán Garro
      Hernán Garro Review from Google
      5.0 ★

      Hernán Garro's Review Sourced from Google

      Excellent working place. People is the most valuable characteristic. Interest in continuous improvement is not less remarkable. It is a comfortable place to work with plenty of amenities.

    • Andres Sierra
      Andres Sierra Review from Google
      5.0 ★

      Andres Sierra's Review Sourced from Google

      Test your software before taking it to production, do it with what you are developing or with what you are buying.

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
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    4.8 4.8 (42)

  • Coderio

    Accelerate Your Digital Transformation.

    Coderio helps companies of all sizes, from Fortune 500 to SMBs, across the Americas accelerate their digital transformation. Their services are tailored to accomplish objectives through expert knowledge, problem-solving, and streamlining deliverables...

    Top Services:

    • Software Development
    • UI/UX Design
    • Web Development
    • eCommerce Development
    • AI Development
    • Show more
    Location
    Miami, Florida
    Number of Employees
    250 - 499
    Average Hourly Rate
    $50/hr
    Minimal Budget
    $50,000 & Up

    Coderio Services

    • Software Development
    • UI/UX Design
    • Web Development
    • eCommerce Development
    • AI Development
    • Mobile App Development
    • Staff Augmentation
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • VISA
    • BBVA
    • Coca Cola
    • IBM
    • McDonalds
    • Aston Martin
    • Avon
    • Fedex
    • Cinemark
    • Santander Group
    Data sourced from the agency's DesignRush profile

    Coderio Reviews & Testimonials

    • Dailiet Roxana Chinea Pantaleon
      Dailiet Roxana Chinea Pantaleon Review from Google
      5.0 ★

      Dailiet Roxana Chinea Pantaleon's Review Sourced from Google

      I received excellent support from Coderio. They were dependable at every step, and their communication was consistently clear.

    • Jefry Saul Rauda Padilla
      Jefry Saul Rauda Padilla Review from Google
      5.0 ★

      Jefry Saul Rauda Padilla's Review Sourced from Google

      They are efficient, reliable, and always go the extra mile to deliver outstanding results. Personal muy capacitado.

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
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    4.6 4.6 (30)

  • Vates

    Smartest Software Solutions, right on time

    We're a leading IT custom software firm with 30 years of experience in LATAM. Our elite 10% developer team delivers top-notch quality, speed, and affordability, as proven by clients like Motorola, Intel, IBM, and Oracle. We offer Software Dedicated Teams and Staff Augmentation to boost your project...

    Top Services:

    • Software Development
    • Staff Augmentation
    • Software Testing
    • IT Services
    • HR Outsourcing
    • Show more
    Location
    Atlanta, Georgia
    Number of Employees
    500 - 999
    Average Hourly Rate
    $40/hr
    Minimal Budget
    $50,000 & Up

    Vates Services

    • Software Development
    • Staff Augmentation
    • Software Testing
    • IT Services
    • HR Outsourcing
    • Big Data Analytics
    • Web Development
    • Cloud Consulting
    • DevOps Consulting
    • Mobile App Development
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • IBM
    • Oracle
    • Siemens
    • HP
    • Motorola
    • NEC
    • TYCO
    • Fiat
    • Shell
    • Accenture
    Data sourced from the agency's DesignRush profile
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  • EmbarkingOnVoyage

    Your leading data and product engineering partner.

    EmbarkingOnVoyage Digital Solutions is your premier partner in data and product engineering, empowering technology companies, large enterprises, and SMBs to transform industries such as travel, healthcare, banking, finance, and more through innovative solutions. We specialize in revolutionizing technology and...

    Top Services:

    • Digital Services
    • Mobile App Development
    • Software Development
    • Software Testing
    • Web Design
    • Show more
    Location
    Darnestown, Maryland
    Number of Employees
    50 - 99
    Average Hourly Rate
    $40/hr
    Minimal Budget
    $50,000 & Up

    EmbarkingOnVoyage Services

    • Digital Services
    • Mobile App Development
    • Software Development
    • Software Testing
    • Web Design
    • UI/UX Design
    • DevOps Consulting
    • Staff Augmentation
    • AI Development
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Mahindra
    • Reliance Industries Limited
    • Docbyte
    • Garvis
    Data sourced from the agency's DesignRush profile
    Visit Website View Profile

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