Top C# Development Companies & Expert C# Developers in USA

Explore the best C# development companies in USA! Our curated list features top C# developers who specialize in building scalable applications, custom software, and enterprise solutions. These experts deliver high-quality results, ensuring that your business objectives are met while enhancing overall operational efficiency with reliable and innovative solutions.
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4.9 out of 5, based on 633 real reviews.
Rankings updated: Mar 25, 2026

List of Top C# Development Companies in USA| Best C# Developers & Service Providers

Certain agencies may be featured through sponsored placements. Rankings and SF Scores remain unbiased and are based solely on our evaluation methodology.

306 Companies

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2

SF Score

SF Score is calculated using our SARM methodology to evaluate agency expertise, market presence, and overall credibility. View Ranking Methodology

2

SF Score

SF Score is calculated using our SARM methodology to evaluate agency expertise, market presence, and overall credibility. View Ranking Methodology

View Profile Visit Website
Services Provided
info
Expertise Distribution (%)
  • 20% Software Development

  • 20% Mobile App Development

  • 20% Web Development

  • 20% AI Development

  • 10% Web Design

  • 10% Cloud Computing Services

Stability In Agility

SpurTree Technologies, Inc. is a global software development and digital transformation company helping enterprises, startups, and emerging businesses innovate with modern technology. With over a decade of experience, we provide strategic consulting, custom software development, and enterprise technology solutions for organizations worldwide. Our team has supported leading brands such as IKEA, Shell, and Computershare, delivering scalable solutions across industries including retail, healthcare, energy, travel, manufacturing, and information services. Core capabilities include web and mobile app development, AI and data analytics, DevSecOps, UX design, application modernization, SAP integrations, eCommerce, and quality assurance, enabling businesses to accelerate growth and stay competitive in a rapidly evolving digital landscape.

View SpurTree USA, Inc. Profile
Inside Service Listing

$50-$99/hr

Hourly Rate
Inside Service Listing

$10,000+

Min. Budget Size
Inside Service Listing

250 - 999

Team size
Inside Service Listing

Las Vegas, USA

Location

2

SF Score

SF Score is calculated using our SARM methodology to evaluate agency expertise, market presence, and overall credibility. View Ranking Methodology

2

SF Score

SF Score is calculated using our SARM methodology to evaluate agency expertise, market presence, and overall credibility. View Ranking Methodology

View Profile Visit Website
Services Provided
info
Expertise Distribution (%)
  • 20% Software Development

  • 20% Ecommerce Development

  • 20% Mobile App Development

  • 20% Web Development

  • 10% CMS

  • 10% Web Design

Intersection of vision, execution, and connection

Knectar is a full-service web design and development agency specializing in building complex, high-performance digital platforms for enterprise and growing brands. With proven experience delivering projects for organizations like Harvard Medical School, MIT, and global consumer brands, we excel in custom website development, eCommerce solutions, and scalable web applications. Our expertise spans leading platforms including Drupal, Shopify, Magento, and WordPress, along with custom development tailored to unique business requirements. We provide end-to-end services—from UX/UI design and information architecture to SEO, content strategy, and API integrations with CRMs like Salesforce and HubSpot. Knectar’s agile, full-stack team ensures projects are delivered on time, on budget, and optimized for performance, security, and mobile responsiveness. We also actively contribute to open-source communities, reinforcing our commitment to innovation. Partner with Knectar to build robust, future-ready digital experiences that drive measurable business growth.

View Knectar Profile
Inside Service Listing

$100-$149/hr

Hourly Rate
Inside Service Listing

$5,000+

Min. Budget Size
Inside Service Listing

2 - 9

Team size
Inside Service Listing

Easthampton, USA

Location

1

SF Score

SF Score is calculated using our SARM methodology to evaluate agency expertise, market presence, and overall credibility. View Ranking Methodology

1

SF Score

SF Score is calculated using our SARM methodology to evaluate agency expertise, market presence, and overall credibility. View Ranking Methodology

View Profile Visit Website
Services Provided
info
Expertise Distribution (%)
  • 10% Software Development

  • 10% Mobile App Development

  • 10% Web Development

  • 10% Web Design

  • 10% IT Services

  • 10% Blockchain Development

  • 10% AI Development

  • 10% Cloud Computing Services

  • 10% CMS

  • 10% Digital Transformation

Where AI Meets Execution

APG Technology is a boutique technology consulting and software development firm that helps businesses leverage AI, automation, and custom software solutions to modernize workflows, streamline operations, and drive sustainable growth. Headquartered in Atlanta, Georgia, APG serves clients across financial services, healthcare, and government sectors, delivering high-impact technology solutions tailored to industry needs. Top custom software development company, leading UX agency, and innovative AI solutions provider, APG blends on-shore product consultants and UX designers with near-shore software engineers and QA teams to provide scalable, cost-effective, and high-quality digital solutions. Our services include product strategy, web and mobile app development, low-code/no-code implementations, AI-powered workflow automation, and staff augmentation via Project Pods or individual consultants. Driven by our core values of empathy and stewardship of client resources, we take a hands-on, collaborative approach to solve complex business challenges, improve employee and customer experiences, and achieve measurable results. With a reputation for being innovative, responsive, and results-oriented, APG Technology is the strategic partner organizations rely on to unlock operational excellence, maximize ROI, and accelerate digital transformation.

View APG Technology Profile
Inside Service Listing

$100-$149/hr

Hourly Rate
Inside Service Listing

$10,000+

Min. Budget Size
Inside Service Listing

2 - 9

Team size
Inside Service Listing

Atlanta, USA

Location

1

SF Score

SF Score is calculated using our SARM methodology to evaluate agency expertise, market presence, and overall credibility. View Ranking Methodology

1

SF Score

SF Score is calculated using our SARM methodology to evaluate agency expertise, market presence, and overall credibility. View Ranking Methodology

View Profile Visit Website
Services Provided
info
Expertise Distribution (%)
  • 10% Software Development

  • 20% Mobile App Development

  • 10% Web Development

  • 10% IT Services

  • 10% Blockchain Development

  • 10% Internet of Things

  • 10% AI Development

  • 10% Cloud Computing Services

  • 10% Business Services

We are changing the world with technologies

MedRec Technologies is a London-based software development company delivering advanced digital solutions to businesses worldwide. With a global team of 60+ software engineers, consultants, designers, and technology specialists across the UK, USA, Europe, the Middle East, and Asia, we provide scalable and high-performance software tailored to modern business needs. Our expertise includes AI and Machine Learning, Big Data Analytics, IoT, Cloud Computing, Blockchain, RPA, Cybersecurity, and SDN-NFV, enabling organizations to accelerate digital transformation. We serve diverse industries such as healthcare, fintech, retail, manufacturing, education, robotics, e-commerce, and transportation. Our core services include custom software development, mobile and web application development, enterprise solutions, automation systems, chatbot development, real-time applications, QA testing, and IT consulting. With a strong focus on innovation, quality, and collaboration, MedRec Technologies helps businesses build reliable, secure, and future-ready technology solutions.

View MedRec Technologies Profile
Inside Service Listing

< $25/hr

Hourly Rate
Inside Service Listing

$10,000+

Min. Budget Size
Inside Service Listing

50 - 249

Team size
Inside Service Listing

San Francisco, USA

Location

1

SF Score

SF Score is calculated using our SARM methodology to evaluate agency expertise, market presence, and overall credibility. View Ranking Methodology

1

SF Score

SF Score is calculated using our SARM methodology to evaluate agency expertise, market presence, and overall credibility. View Ranking Methodology

View Profile Visit Website
Services Provided
info
Expertise Distribution (%)
  • 10% Software Development

  • 20% Mobile App Development

  • 20% Ecommerce Development

  • 20% Web Development

  • 10% Web Design

  • 10% Product Engineering services

  • 10% AI Development

Let's build awesome

SDI is a global software development company delivering innovative digital solutions to businesses for over 20 years. We specialize in custom software development, mobile app development, web design and development, and digital marketing services, helping organizations transform ideas into scalable digital products. Our team of 200+ certified professionals and 30+ UI/UX experts collaborates closely with clients to create tailored solutions that align with their business goals. With offices in California, Melbourne, and multiple locations in India, SDI has served 5,000+ clients worldwide and successfully delivered 2,000+ applications across industries including finance, education, healthcare, enterprise, social networking, and startups. Trusted by brands such as Pepsi, Stanford University, and Marvell, we focus on building high-performance applications, responsive websites, and growth-driven digital strategies that help businesses innovate, scale, and compete in today’s digital landscape.

View SDI - Software Developers Inc Profile
Inside Service Listing

< $25/hr

Hourly Rate
Inside Service Listing

$1,000+

Min. Budget Size
Inside Service Listing

50 - 249

Team size
Inside Service Listing

Saratoga, USA

Location

1

SF Score

SF Score is calculated using our SARM methodology to evaluate agency expertise, market presence, and overall credibility. View Ranking Methodology

1

SF Score

SF Score is calculated using our SARM methodology to evaluate agency expertise, market presence, and overall credibility. View Ranking Methodology

View Profile Visit Website
Services Provided
info
Expertise Distribution (%)
  • 10% Software Development

  • 20% Ecommerce Development

  • 20% Mobile App Development

  • 10% Web Development

  • 10% Digital Transformation

  • 10% Cloud Computing Services

  • 10% Web Design

  • 10% CMS

Experts in digital transformation powered by AI

LogosCorp is a full-service digital and e-commerce agency committed to driving measurable growth and brand value through innovative web solutions. With over 25 years of industry experience, we provide tailored technology strategies that align with your business goals. Founded in 1997, our team of 35 skilled professionals operates from a nearshore production hub, delivering web development, app deployment, and digital commerce solutions for both fixed-quote projects and dedicated outsourced teams. We’ve successfully completed 400+ projects for 200+ clients across diverse industries, including HBO, Toyota, Pepsi, Unilever, and Johnson & Johnson. Our expertise spans B2C and B2B e-commerce, creating seamless online shopping experiences that boost conversions and customer loyalty. From platform selection to design, development, and optimization, we focus on solutions that leverage each ecosystem’s strengths while ensuring scalability, usability, and high performance. At LogosCorp, we thrive on challenging projects that require deep technical knowledge and creativity. Whether it’s a custom e-commerce store, web application, or full digital transformation, our mission is to help brands maximize revenue, enhance their online presence, and achieve lasting digital success.

View LogosCorp Profile
Inside Service Listing

$100-$149/hr

Hourly Rate
Inside Service Listing

$5,000+

Min. Budget Size
Inside Service Listing

10 - 49

Team size
Inside Service Listing

Weston, USA

Location
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