Best C# Development Companies

7 Companies - Rankings updated: September 03, 2026

We evaluate every agency on DesignRush for technical expertise, delivery quality, and verified feedback to help businesses find reliable software development services. Some listings may be paid.

C#
C# Development × Construction × $50,000 & Up × Clear Filters
  • Award Winning Custom Development Experts | ERP Integration | Shopify/BigCommerce

    QOLOS (pronounced "koh-lohs") is a U.S.-based software development company, specializing in building custom, high-performance digital solutions for brands that demand innovation. From complex ERP integrations to e-commerce solutions - you are in good hands with QOLOS...

    Top Services:

    • Web Development
    • eCommerce Development
    • WordPress Website Design
    • Software Development
    • UI/UX Design
    • Show more
    Location
    Green Bay, Wisconsin
    Number of Employees
    50 - 99
    Average Hourly Rate
    $150/hr
    Minimal Budget
    $50,000 & Up

    QOLOS Services

    • Web Development
    • eCommerce Development
    • WordPress Website Design
    • Software Development
    • UI/UX Design
    • SEO
    • Software Testing
    • Mobile App Development
    • ERP Consulting
    • DevOps Consulting
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Thermos
    • Certco
    • Stryker
    • Louisville Vegan Jerky
    • Dallas Morning News
    • Dallas Police Department
    • Bancroft and Sons
    • Schneider National
    • Cocktail Courier
    • Restaurant Warehouse
    Data sourced from the agency's DesignRush profile

    QOLOS Reviews & Testimonials

    • Amanda Viviano
      Amanda Viviano Vice President at Bartz Viviano
      5.0

      WooCommerce Review from Amanda Viviano

      We hired Qolos to build our local florist shop's website on WordPress and WooCommerce, and we couldn't be happier with the results. From the start, they took the time to understand our business and created a site that's not only beautiful but easy for our customers to browse and shop. The WooCommerce setup was seamless, our online ordering works exactly the way we needed it to. But what really sets Qolos apart is their ongoing monthly maintenance. We never have to worry about updates, security, or technical issues because they stay on top of everything. Any time we've had a question or a small change request, they've been responsive and professional. As a small local business, it means a lot to work with a team that genuinely cares about keeping our site running smoothly. Qolos has been a true partner, not just a vendor. Highly recommend them to any local business looking for reliable web design and maintenance!

    • Sanjay Singh
      Sanjay Singh Manager at JCB India Ltd.
      5.0

      Web Development Review from Sanjay Singh

      I kept getting negative reviews about my app for technical glitches, heating issues, functionality, loading time, crashing, and more bugs. So, I reached out to QOLOS after going through 2-3 renowned review platforms. I explained my app issue to the team, and they did tremendous work with their mobile testing solutions. Also, I wanted to build a website for my app. They created a feature-rich and seamless website.

    • Sarah Nesheim
      Sarah Nesheim Co-Founder at Crafted
      5.0

      Shopify Review from Sarah Nesheim

      Working with QOLOS was the best decision I have made in regards to scaling my business. They are professional, so creative, they communicate every step of the way and their pricing is fair for the highest quality work. The designer of our logo and website did it well and I am so impressed and proud of the final product! the designer listened and knew exactly what I wanted which made the process so simple. Seriously could not recommend QOLOS more!

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
  • A Reliable Full-Service Software Development, Cloud, DevOps and QA Partner

    Leveraging 30 years of excellence designing, developing, deploying and supporting world-class software solutions, Kanda Software has established itself as a trusted Software Development, Cloud Engineering, DevOps and QA partner for companies ranging from innovative startups to large enterprises...

    Top Services:

    • Software Development
    • Mobile App Development
    • IT Services
    • IoT
    • VR/AR
    • Show more
    Location
    Boston, Massachusetts
    Number of Employees
    500 - 999
    Average Hourly Rate
    $50/hr
    Minimal Budget
    $50,000 & Up
    Portfolios Count
    16 Projects Listed

    Kanda Software Services

    • Software Development
    • Mobile App Development
    • IT Services
    • IoT
    • VR/AR
    • UI/UX Design
    • Staff Augmentation
    • Business Consulting
    • ERP Consulting
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • OneSky
    • Rue La La
    • imprivata
    • Lionbridge
    • CBRE
    • Havas Media
    • College Interactive
    • KAUST
    • Nuance
    • Association of Computing Machinery
    Data sourced from the agency's DesignRush profile

    Kanda Software Reviews & Testimonials

    • Alex Koifman
      Alex Koifman President at RJCF
      5.0

      Software Development Review from Alex Koifman

      I've used Kanda's services for years. They're reliable and their work is of high quality. I'd recommend them to anyone looking for a partner in software engineering initiatives.

    • Andrew Duggan
      Andrew Duggan CEO at medQue
      5.0

      Mobile App Development Review from Andrew Duggan

      Kanda proved to be an exceptional choice for our development needs. They were much more [of] a partner to our startup than a vendor. The entire team treated our project like it was their own company, and the results showed that. Our customers were extremely please[d] with the desktop and mobile applications. I would definitely recommend hiring Kanda for any and all of your development needs. (Verified via email)

    • Alan Bugos
      Alan Bugos Head of Technology at LifePod Solutions
      4.8

      Software Development Review from Alan Bugos

      We have worked with Kanda Software for over two years and [are] very please[d] with the quality of work, cost-effective approach in resourcing team members, and the expertise they bring to solving very complex development challenges. Overall, we are very happy with Kanda's team! (Verified via email)

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
  • Talentica Software

    Verified Verified by the DesignRush team for authenticity and credibility.

    Building Products AI-Native Way

    Talentica offers product engineering, with a playbook-driven approach refined across more than 200 products over 22 years. Its 200+ GenAI-certified developers deployed AI features in 60% of products. Recommended for startups and SaaS companies needing MVP development, AI integration, or product scaling...

    Top Services:

    • Software Development
    • AI Development
    • IT Services
    • Big Data Analytics
    • Blockchain
    • Show more
    Location
    Pune, India
    Number of Employees
    500 - 999
    Average Hourly Rate
    $30/hr
    Minimal Budget
    $50,000 & Up
    Portfolios Count
    7 Projects Listed

    Talentica Software Services

    • Software Development
    • AI Development
    • IT Services
    • Big Data Analytics
    • Blockchain
    • Mobile App Development
    • Staff Augmentation
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Wideorbit
    • Sema4.AI
    • Realization Technologies Inc.
    • TailoredMail
    • StructuredWeb Inc
    • Amplify
    • Mist Systems (Juniper Company)
    Data sourced from the agency's DesignRush profile

    Talentica Software Reviews & Testimonials

    • Ashish Sharma
      Ashish Sharma Sr Engineering Manager at OpenGov India Pvt Ltd
      4.7

      Software Development Review from Ashish Sharma

      Talentica has proven to be an exceptional software outsourcing partner, consistently exceeding expectations in both the quality of their resources, deliverables and their commitment to our success. They function not merely as a vendor, but as an extension of our core engineering team. Key Highlights of our Partnership: High Resource Quality: The engineers provided by Talentica are technically strong and highly competent. They integrate seamlessly with our internal teams and quickly take ownership of complex projects. Commitment and Reliability: Talentica is a truly reliable partner that consistently demonstrates a strong willingness to go beyond the standard scope of work. They proactively identify risks and contribute innovative solutions. Critical Project Support: Their expertise was pivotal in two critical areas: Data Pipeline & Reporting: They were instrumental in both enhancing and maintaining a reliable data pipeline & reporting infrastructure. Software Upgrades: They managed challenging, large-scale software upgrades, ensuring we successfully transitioned to modern technology stacks with minimal disruption. Overall, Talentica is a dependable and high-value partner assisting our mission-critical projects.

    • Anonymous
      Anonymous Advisor at IT Company
      5.0

      Software Development Review from Anonymous

      We had created a conceptual framework to authenticate and verify the provenance, transaction history, and authorship of blockchain-based NFTs. Talentica was brought on board to test and refine the concept from both functional and engineering perspectives, and later to build a Minimum Viable Product (MVP) aligned with the agreed specifications and constraints.

    • Anonymous
      Anonymous Engineering Manager at SaaS Company
      5.0

      Software Development Review from Anonymous

      For several years, the team was composed entirely of Talentica contractors. Since January 2022, I have been directly managing them. The Talentica team handled the admin tooling backend, which included multiple Python Flask services with Postgres and Elasticsearch. These services operated in a service-oriented architecture deployed on Kubernetes, using Istio for service mesh and Spinnaker for deployments.

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
  • 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...

    Top Services:

    • AI Development
    • IoT
    • DevOps Consulting
    • Cloud Consulting
    • Mobile App Development
    • Show more
    Location
    Denver, Colorado
    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
    • Hewlett Packard Enterprise
    • Tracking Genie
    • Brideside
    • Air Fusion
    • vCard Global
    • Codexa
    • PTGI
    • INSPRO
    • NERVVE
    • GoShow
    Data sourced from the agency's DesignRush profile

    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.

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
  • Succeed Faster With Syberry.

    We've delivered 300+ software solutions for American companies of all sizes, from emerging startups to Fortune 200 companies in many domains: healthcare, FinTech, automotive, energy management, real estate, education, e-commerce, and others...

    Top Services:

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

    Syberry Corporation Services

    • Software Development
    • Mobile App Development
    • DevOps Consulting
    • AI Development
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • PayPal
    • Shell
    • JLL
    • THG Energy Solutions
    • FTSE Russel. London Stock exchange
    • Livestream
    • Telespace
    • Baylor Scott and White Healthcare
    • Ethisphere
    Data sourced from the agency's DesignRush profile

    Syberry Corporation Reviews & Testimonials

    • John Fox
      John Fox Solution Architect / Project Owner at Formulary Insights
      5.0

      Software Development Review from John Fox

      Syberry Corporation handles several projects for the client; always aligning with the set design criteria. Every output from it not only meets but surpasses the client's expectations and works flawlessly upon launch. The team at Syberry is adept at managing numerous projects simultaneously and showcases profound knowledge in software development. Its unwavering commitment has consistently contributed to the ongoing success of the collaboration. (Verified via email)

    • Rudy Milković
      Rudy Milković Executive Director / Founder at Velikom International
      4.8

      Software Development Review from Rudy Milković

      The final product surpassed the client's expectations. Syberry Corporation consistently offered top-notch results promptly and at an excellent value. It kept the client informed regularly and continually asked for input at every phase. Clients can anticipate a seasoned team from Syberry Corporation that adeptly turns ideas into practical solutions. (Verified via email)

    • Andrew Stanifer
      Andrew Stanifer Review from Google
      5.0

      Andrew Stanifer's Review Sourced from Google

      I cannot say enough good things about Syberry and the experience I had with them! The entire team was extremely customer focused and incredible to work with. They will without out a doubt be our continued partner and go-to for any future software development!

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
  • 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
  • AI-accelerated engineering partner for legacy modernization and smart enterprise solutions dev

    Founded in 2018, Devox Software partners with mid-market and enterprise businesses to modernize aging systems, engineer new digital products, and bring AI into production the right way: safely, incrementally, and with measurable ROI...

    Top Services:

    • Software Development
    • Cloud Consulting
    • AI Development
    • DevOps Consulting
    • Mobile App Development
    • Show more
    Location
    Miami, Florida
    Number of Employees
    100 - 249
    Average Hourly Rate
    $75/hr
    Minimal Budget
    $50,000 & Up
    Portfolios Count
    7 Projects Listed

    Devox Software Services

    • Software Development
    • Cloud Consulting
    • AI Development
    • DevOps Consulting
    • Mobile App Development
    • Big Data Analytics
    • Business Consulting
    • IoT
    • Digital Strategy
    • Web Development
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Syngenta
    • Truevo
    • CureMedia
    • Optherium
    • ActivePlace
    • Ferretly
    • SwissMentor
    • Damundo
    • Espressotoria
    • ILVE
    Data sourced from the agency's DesignRush profile

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