Best Custom Business Software Development Firms in the USA

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    Targets we’ve achieved:
    Increased US Software Development Company's annually acquired clients by 400% *
    Generated 50+ business opportunities for UK Architecture & Design Services Provider *
    Reduced cost per lead by over 6X for Dutch Event Technology Company *
    Reached out to 13,000 target prospects and generated 400 opportunities for Swiss Sports Tech Provider *
    Boosted conversion rate of Ukrainian IT Company by 53.6% *
    Increased US Software Development Company's annually acquired clients by 400% *
    Generated 50+ business opportunities for UK Architecture & Design Services Provider *
    Reduced cost per lead by over 6X for Dutch Event Technology Company *
    Reached out to 13,000 target prospects and generated 400 opportunities for Swiss Sports Tech Provider *
    Boosted conversion rate of Ukrainian IT Company by 53.6% *
    Increased US Software Development Company's annually acquired clients by 400% *
    Generated 50+ business opportunities for UK Architecture & Design Services Provider *
    Reduced cost per lead by over 6X for Dutch Event Technology Company *
    Reached out to 13,000 target prospects and generated 400 opportunities for Swiss Sports Tech Provider *
    Boosted conversion rate of Ukrainian IT Company by 53.6% *
    Increased US Software Development Company's annually acquired clients by 400% *
    Generated 50+ business opportunities for UK Architecture & Design Services Provider *
    Reduced cost per lead by over 6X for Dutch Event Technology Company *
    Reached out to 13,000 target prospects and generated 400 opportunities for Swiss Sports Tech Provider *
    Boosted conversion rate of Ukrainian IT Company by 53.6% *
    Increased US Software Development Company's annually acquired clients by 400% *
    Generated 50+ business opportunities for UK Architecture & Design Services Provider *
    Reduced cost per lead by over 6X for Dutch Event Technology Company *
    Reached out to 13,000 target prospects and generated 400 opportunities for Swiss Sports Tech Provider *
    Boosted conversion rate of Ukrainian IT Company by 53.6% *
    Increased US Software Development Company's annually acquired clients by 400% *
    Generated 50+ business opportunities for UK Architecture & Design Services Provider *
    Reduced cost per lead by over 6X for Dutch Event Technology Company *
    Reached out to 13,000 target prospects and generated 400 opportunities for Swiss Sports Tech Provider *
    Boosted conversion rate of Ukrainian IT Company by 53.6% *
    AI Summary
    Max Mykal
    Co-Founder @ Lengreo

      When off-the-shelf solutions don’t cut it, that’s where custom software steps in-and not just any code slapped together overnight. We’re talking about smart, strategic development tailored to your business model, your users, and your goals.

      From streamlining operations to launching new digital products, the right software partner can be a serious growth lever. But with so many dev shops out there, knowing who’s genuinely good-and not just good at pitching-can be tricky. In this guide, we’ll dig into what sets top-tier U.S. custom software firms apart and what to look for before you shake hands.

      1. Lengreo

      1. Lengreo

      We see ourselves as partners who help navigate the tricky world of digital marketing, especially for B2B businesses. Our approach is built around understanding what makes each client unique and then crafting strategies that align with their strengths. We don’t just offer generic plans – we aim to get into the nitty-gritty, from generating qualified leads to managing social media and content, all with a clear focus on what works best for each situation. It’s not just about pushing ads or ticking boxes but about helping businesses grow in a way that fits their needs.

      We believe that good communication makes a big difference, so we strive to keep things transparent and collaborative. We are also a custom business software development company. Sometimes that means meeting face-to-face, especially for clients in Central Europe and USA, to make sure everyone is on the same page and moving forward productively. From SEO and paid ads to website development and demand generation, we cover the full range of digital marketing services but always with an eye on clear results and partnership.

       

      Key Highlights:

      • Focus on B2B digital marketing with tailored strategies
      • Emphasis on generating qualified leads and optimizing campaigns
      • Option for in-person meetings in Central Europe
      • Transparent communication and integration with client teams
      • Leadership role in managing digital marketing efforts

      Services:

      • B2B Digital Marketing Strategy & Consulting
      • Lead Generation & Appointment Setting
      • Search Engine Optimization (SEO)
      • Social Media & Content Marketing
      • Paid Advertisement Services
      • Demand Generation
      • Website Development Services

      Contact and Social Media Information:

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      Our cases
      SEO for BIM & VDC Services Provider
      SEO for BIM & VDC Services Provider
      PPC For Adult Content Platform
      PPC For Adult Content Platform
      Biological Age Blood Testing Kit
      Biological Age Blood Testing Kit
      2. ELEKS

      2. ELEKS

      ELEKS works with a range of clients, including large enterprises, mid-sized businesses, and tech-focused startups. Their main focus is on helping organizations develop custom software solutions, improve product design, and support digital initiatives through consultancy and quality assurance. They aim to take a more involved role than just offering outsourced services by sharing responsibility for the outcomes of their projects.

      The company approaches collaboration as a partnership, often integrating closely with their clients’ teams. Their process emphasizes detail-oriented execution and an openness to working with emerging technologies. While they operate across multiple domains, their work typically centers on adding measurable value through tailored technical solutions.

       

      Key Highlights:

      • Works with enterprises, SMEs, and startups
      • Offers detailed and collaborative development processes
      • Integrates into client teams and shares project risk
      • Focus on value-driven outcomes and adaptability

      Services:

      • Custom software development
      • Product design
      • Quality assurance
      • IT consulting

      Contact Information:

      • Website: eleks.com
      • Facebook: www.facebook.com/ELEKS.Software
      • Twitter: x.com/ELEKSSoftware
      • LinkedIn: www.linkedin.com/company/eleks
      • Address: 625 W. Adams St., Chicago, IL 60661
      • Phone: +1 708 967 4803

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        3. Intellectsoft

        3. Intellectsoft

        Intellectsoft provides software engineering and consulting services with a focus on digital transformation. They support both global companies and startups by helping them adopt new technologies and navigate the complexities that often come with digital change. The company has been around since 2007 and works on projects that range from consumer apps to larger enterprise platforms.

        Their workflow generally covers the entire product lifecycle, from the initial concept to long-term maintenance. They also offer a structured support model referred to as the IS360 framework. Their approach is to simplify technology adoption for clients while maintaining a consistent development process that aligns with modern standards.

         

        Key Highlights:

        • Founded in 2007 with a digital transformation focus
        • Works with both enterprise clients and startups
        • Covers full lifecycle from ideation to delivery
        • Offers structured support through IS360 framework

        Services:

        • Software engineering
        • Digital transformation consulting
        • App development (consumer and enterprise)
        • System integration and long-term support

        Contact Information:

        • Website: www.intellectsoft.net
        • E-mail: info@intellectsoft.net
        • Facebook: www.facebook.com/Intellectsoft
        • Twitter: x.com/Intellectsoft
        • LinkedIn: www.linkedin.com/company/intellectsoft
        • Address: 500 Fashion Ave Fl 8A New York City NY 10018, USA
        • Phone: +1 (650) 233-6196
        4. ScienceSoft

        4. ScienceSoft

        ScienceSoft is a U.S.-based software development and IT consulting firm with roots going back to 1989. They are known for maintaining clear timelines, transparency in communication, and consistent service quality across projects. Their internal structure includes specialized units that oversee project management, technology strategy, and solution architecture.

        They take a process-focused approach to delivery, using internal frameworks and standards to guide teams and projects. Their aim is to keep work on track while maintaining ethical and professional standards. This structure also supports long-term collaboration and helps align their services with client objectives.

         

        Key Highlights:

        • Established in 1989 with U.S. operations
        • Emphasizes structured internal organization
        • Known for time and budget control
        • Focused on transparent communication and accountability

        Services:

        • IT consulting
        • Custom software development
        • Project management services
        • Architecture and technology planning

        Contact Information:

        • Website: www.scnsoft.com
        • E-mail: contact@scnsoft.com
        • Facebook: www.facebook.com/sciencesoft.solutions
        • Twitter: x.com/ScienceSoft
        • LinkedIn: www.linkedin.com/company/sciencesoft
        • Address: 5900 S. Lake Forest Drive, Suite 300 McKinney, Dallas area, TX-75070
        • Phone: +1 214 306 6837
        5. BairesDev

        5. BairesDev

        BairesDev provides custom software development services for a wide range of clients, from early-stage startups to large, established corporations. They have been active since 2009 and operate with a distributed team model, sourcing talent from various regions. Their approach places emphasis on the idea that skilled professionals can come from anywhere, and they maintain a structure that allows for global collaboration.

        In addition to client-facing work, they run a Giveback Program aimed at supporting access to opportunities for people with technical skills. Their development model is centered around forming dedicated teams that work with companies to build or scale digital products. The company maintains a focus on flexible collaboration and long-term client engagement.

         

        Key Highlights:

        • Founded in 2009 with a global talent model
        • Works with clients of all sizes, including startups and enterprises
        • Emphasizes distributed teams and international collaboration
        • Runs an internal program focused on social impact through tech

        Services:

        • Custom software development
        • Dedicated engineering teams
        • Application modernization
        • QA and testing services

        Contact Information:

        • Website: www.bairesdev.com
        • Address: San Francisco 50 California Street California USA
        • Phone:  +1 (408) 478-2739
        • LinkedIn: www.linkedin.com/company/bairesdev
        • Instagram: www.instagram.com/bairesdev
        • Facebook: www.facebook.com/bairesdev
        • Twitter: x.com/bairesdev
        6. Iflexion

        6. Iflexion

        Iflexion is a software development company that has been around for over two decades, working across multiple industries and business sizes. They combine technical development capabilities with business analysis to create software aligned with specific client goals. Their project work tends to include both frontend and backend development, as well as integration with other systems.

        They position themselves as a full-cycle development partner, handling everything from initial planning to post-launch support. Their process typically involves a mix of technical consulting, product development, and collaborative project management. With a sizable team, they can manage projects that vary in complexity and size.

         

        Key Highlights:

        • Covers a wide range of business domains and tech stacks
        • Offers full-cycle development from planning to delivery
        • Blends technical execution with business-focused thinking

        Services:

        • End-to-end software development
        • Business analysis and tech consulting
        • Web and mobile app development
        • System integration and support

        Contact Information:

        • Website: www.iflexion.com
        • Phone:+1 720 207 0369
        • Email: contact@iflexion.com
        • Address: 160 Clairemont Ave, Suite 200, Decatur, GA 30030
        7. Chetu

        7. Chetu

        Chetu is a US-based company offering custom software development for businesses across a variety of industries. Their structure includes teams specialized by industry, allowing them to match projects with developers who have relevant domain experience. They work with companies in flexible arrangements, including onshore, nearshore, and offshore models depending on the needs of the client.

        Their development process is designed to allow real-time communication during client business hours, and they offer dedicated teams for scalability. One of their key points is that clients retain ownership of their software’s source code and IP after delivery. This setup supports long-term flexibility and avoids licensing fees.

         

        Key Highlights:

        • US-based with global development capabilities
        • Provides flexible engagement models based on geography
        • Uses industry-specific teams to match projects to domain experience
        • Clients retain full ownership of software and IP

        Services:

        • Custom software development
        • Mobile and web application development
        • Dedicated development teams
        • System integration and ongoing support

         

        Contact Information:

        • Website: www.chetu.com
        • Address: 1500 Concord Terrace Suite 100, Sunrise FL 33323
        • Email: sales@chetu.com
        • Phone: +954 342 5676
        • LinkedIn: www.linkedin.com/company/chetu-inc-
        • Twitter: x.com/ChetuInc
        • Facebook: www.facebook.com/ChetuInc
        8. Simform

        8. Simform

        Simform focuses on delivering software engineering services that support businesses with complex technology needs. Their work is centered around building and optimizing systems in areas like cloud infrastructure, AI, and data platforms. They take a co-engineering approach, often working closely with internal teams rather than acting as an isolated vendor.

        Their capabilities stretch across a variety of industries, including fintech, healthcare, logistics, and retail. They tend to prioritize flexibility and technical depth in their work, positioning themselves as an engineering-first organization that collaborates across disciplines to meet product and infrastructure goals.

         

        Key Highlights:

        • Uses a co-engineering delivery model
        • Works with industries such as fintech, healthcare, and logistics
        • Focuses on cloud, AI, and data engineering
        • Blends technical depth with collaborative processes

        Services:

        • Cloud and DevOps engineering
        • Data engineering and platform development
        • AI/ML development
        • Digital product design and engineering

        Contact Information:

        • Website: www.simform.com
        • Facebook: www.facebook.com/simform
        • LinkedIn: www.linkedin.com/company/simform
        • Twitter: x.com/simform
        9. Orases

        9. Orases

        Orases is a software development company that combines traditional engineering services with newer tools like AI to build custom solutions. They focus on solving specific business problems through web and mobile applications, often integrating UI/UX design and backend systems into a full product cycle. Their process generally includes both consultation and hands-on technical work.

        In addition to core development, Orases provides support for integration, modernization, and data strategy. They emphasize aligning tech with business goals, and their services cover everything from interface design to building analytics infrastructure. Their use of AI tends to be practical, aimed at making existing systems work more effectively rather than adding unnecessary complexity.

         

        Key Highlights:

        • Offers development backed by AI tools and human expertise
        • Focused on aligning solutions with business needs
        • Works across web, mobile, and data platforms
        • Provides end-to-end delivery including strategy and support

        Services:

        • Custom software development
        • Web and mobile app development
        • UI/UX design
        • AI consulting
        • System integration and modernization
        • Data analytics and strategy

        Contact Information:

        • Website: orases.com
        • Facebook: www.facebook.com/Orases
        • Twitter: x.com/orases
        • LinkedIn: www.linkedin.com/company/orases
        • Instagram: www.instagram.com/orases
        • Address: 5728 Industry Lane | Frederick, MD 21704
        • Phone: 301-756-5527
        10. Glorium Technologies

        10. Glorium Technologies

        Glorium Technologies is a full-cycle software development firm that provides end-to-end services for both startups and established companies. Their approach focuses on adapting to specific client needs, using custom-built solutions to match business goals. They have experience across various types of software projects, from mobile apps to backend systems.

        The company has been active since 2010 and handles projects across different industries. Their services typically include everything from early planning and design to development and support. While they offer a broad range of capabilities, they tend to center their work on building software that fits into a company’s existing structure and strategy.

         

        Key Highlights:

        • Provides full-cycle development for startups and established companies
        • Adapts to specific business needs with custom solutions
        • Covers both frontend and backend development

         

        Services:

        • Custom software and app development
        • End-to-end project delivery
        • Web and mobile applications
        • System design and integration
        • Technical support and maintenance

        Contact Information:

        • Website: gloriumtech.com
        • Twitter: x.com/Glorium_Tech
        • LinkedIn: www.linkedin.com/company/glorium-technologies
        • Address: 100 Overlook Center, 2nd floor, Princeton, NJ 08540 USA
        • Phone: +1-888-354-0883
        11. Rocket Software

        11. Rocket Software

        Rocket Software works with organizations that need to update or integrate their IT infrastructure, data environments, or legacy applications. They focus on helping clients make technical improvements without disrupting current operations. Their approach is often centered around long-term modernization strategies that are adjusted to fit ongoing market shifts and internal business priorities.

        The company has been around since 1990 and has grown into a large international team. Their services tend to revolve around enterprise systems, particularly those that are complex or outdated. Rather than replacing everything, they typically aim to optimize or extend existing systems in a way that balances progress with operational continuity.

         

        Key Highlights:

        • Works with businesses across various industries
        • Focuses on legacy system modernization
        • Balances technical upgrades with operational stability
        • Offers long-term support and strategy development

        Services:

        • Infrastructure modernization
        • Application lifecycle support
        • Data management and integration
        • Legacy system optimization

        Contact Information:

        • Website: www.rocketsoftware.com
        • Facebook: www.facebook.com/RocketSoftwareInc
        • Twitter: x.com/rocket
        • LinkedIn: www.linkedin.com/company/rocket-software
        • Address: 77 Fourth Avenue
 Waltham, MA, USA 02451-1468
        • Phone: +1 855 577 4323
        12. FullStack

        12. FullStack

        FullStack provides software development and staffing services for companies looking to build or scale tech teams. Their model includes on-demand access to developers, designers, AI engineers, QA professionals, and other roles, sourced both in the US and Latin America. Companies can use FullStack either for end-to-end development or to quickly fill technical gaps in existing teams.

        Their process emphasizes flexibility and transparency, particularly in how candidates are vetted and matched to client needs. They work with organizations that need to adjust team sizes frequently or that want access to specific skill sets without long hiring cycles. This setup allows for short-term or ongoing collaboration depending on the project scope.

         

        Key Highlights:

        • Offers access to on-demand technical teams
        • Provides both US-based and nearshore professionals
        • Emphasizes flexible, short-term and long-term resourcing
        • Uses transparent screening and vetting process

        Services:

        • Custom software development
        • AI and machine learning development
        • Technical staff augmentation
        • DevOps, QA, and project management resourcing

        Contact Information:

        • Website: www.fullstack.com
        13. Oxagile

        13. Oxagile

        Oxagile develops custom software and provides consulting for companies with varying technical needs. They handle projects from start to finish, often working on system design, scalability, and enhancing existing platforms. If a client has a product that needs improvement, Oxagile steps in to either upgrade or rework specific components.

        In addition to development, they offer full audits and consulting for businesses dealing with process issues or tech debt. Their R&D team also plays a role in identifying relevant technologies for certain use cases, especially where emerging tools might provide an edge. Their work is typically grounded in a mix of hands-on engineering and project-based advisory.

         

        Key Highlights:

        • Covers both new builds and improvements to existing systems
        • Maintains an internal R&D function for applied innovation
        • Works across multiple phases of software delivery

        Services:

        • Custom software development
        • Software audits and consulting
        • System upgrades and feature expansion
        • Technology research and feasibility analysis

         

        Contact Information:

        • Website: www.oxagile.com
        • Facebook: www.facebook.com/oxagile
        • Twitter: x.com/Oxagile
        • LinkedIn: www.linkedin.com/company/oxagile
        • Address: 165 Broadway, 23rd Floor, New York, NY 10006, USA
        • Phone: +1 332 242 2402
        14. Yeti

        14. Yeti

        Yeti started out in 2010 when the founders were still in college, creating mobile apps. From the beginning, they approached product development as a balance between creativity and practical business needs, which shaped how they work. Over the years, they’ve expanded their expertise across different industries, including AI, e-commerce, wearables, and even Web3 technologies. Their process covers everything from early planning and design through to full development and launch, involving clients closely at every step.

        Their approach emphasizes collaboration and adaptability, with a focus on guiding projects through the entire product lifecycle. Yeti has built ongoing relationships with clients by blending innovation, design, and technology in ways that suit each project’s unique challenges.

         

        Key Highlights:

        • Founded by college students with a focus on balanced creative processes
        • Close client collaboration throughout product development lifecycle

        Services:

        • Digital product design and development
        • AI and emerging tech integration
        • Full product lifecycle support
        • Strategic planning and roadmapping

        Contact Information:

        • Website: www.yeti.co
        • E-mail: hello@yeti.co
        • Facebook: www.facebook.com/yetillc
        • LinkedIn: www.linkedin.com/company/yeti-llc
        • Instagram: www.instagram.com/yetillc
        • Phone: (415) 766-4198
        15. Softeq

        15. Softeq

        Softeq is known for working with clients of all sizes on developing smart, connected products. They tackle complex challenges involving AI, IoT, wearables, industrial automation, and robotics. The company has a strong foundation in new product development and R&D, which allows them to handle technically difficult projects. Alongside building products, they provide business consulting focused on digital transformation and innovation.

        Their capabilities include a venture studio to support early-stage startups, giving them a broad reach from ideation to delivery. Softeq emphasizes delivering projects on time and within budget while covering a full range of services under one roof. Their approach is aimed at practical innovation that can be scaled globally.

         

        Key Highlights:

        • Specializes in smart, connected solutions across various advanced technologies
        • Includes a venture studio for early-stage startup support
        • Focus on delivering within time, budget, and scope

        Services:

        • AI/ML and IoT solutions
        • Wearables and robotics development
        • Industrial automation
        • Innovation consulting and digital transformation

         

        Contact Information:

        • Website: www.softeq.com
        • Facebook: www.facebook.com/softeq
        • Twitter: x.com/Softeq
        • LinkedIn: www.linkedin.com/company/softeq
        • Instagram: www.instagram.com/softeq
        • Address: Dairy Ashford Rd., Suite 125 Houston, Texas 77079 USA
        • Phone: + 1 281 552-5000

        Conclusion

        When it comes to finding the right custom software development partner in the US, there’s no one-size-fits-all answer. Each company brings its own flavor-whether it’s deep technical know-how, industry-specific insights, or a hands-on collaborative approach. What really matters is matching your business’s unique challenges with a team that feels like a natural fit, not just in skills but in how they work with you.

        The landscape is pretty diverse, and that’s a good thing. It means there’s space for companies that lean into innovation, others that focus on smooth project delivery, and some that put communication and partnership front and center. At the end of the day, it’s about finding a team that not only understands your goals but also helps you navigate the sometimes messy journey of digital transformation without adding extra headaches.

        AI Summary