The absolute best in custom software development
Global software engineering and IT consulting company providing staff augmentation, dedicated teams, and enterprise digital transformation services.
Full spectrum software development and IT outsourcing for healthcare, finance, and logistics with long-term partnership focus.
Leading mobile app development company with 1200+ professionals delivering digital transformation for Fortune 500 companies globally.
Global digital engineering with 500+ employees, ISO/SOC 2 certified, offering AI/ML, cloud, and full-stack development services.
Most trusted company for custom healthcare software solutions, design, and custom services for healthcare industry clients.
Global software development with 250+ engineers, ISO certified, trusted by Visa, Epson, and IBM for 400+ completed projects.
End-to-end digital product development agency focused on emerging technologies with 500+ web projects and 120+ native mobile apps launched.
Global software development company with US headquarters in Delaware delivering custom mobile solutions for enterprises since 2003.
100+ custom software specialists creating momentum for startup success with design vision and business intelligence focus.
Global talent network connecting companies with software developers from Africa and emerging markets for remote team augmentation.
Common questions about the best custom software development agencies in New York.
As of 2026, the top-ranked custom software development agency in New York on AgencyCluster is EPAM Systems, with an AgencyCluster Score of 100/100. Rankings are based on verified evidence across credibility, proof of work, reputation, category specialization, delivery maturity, and freshness. Rankings are updated periodically as new evidence becomes available.
This list features 10 agencies selected from AgencyCluster's curated directory. Each agency was evaluated using the AgencyCluster Score (0–100), with particular weight on demonstrated expertise in custom software development. Only agencies with verified credentials are eligible, and rankings cannot be purchased. The agencies on this list average 16+ years of experience. For full methodology details, see our How We Rank page.
Prioritize agencies that lead with a discovery phase before quoting. Ask how they handle requirements changes mid-project. Request references from clients with similar complexity (not just similar industry). Check if they provide architecture documentation and whether they've built systems that have scaled in production.
Custom enterprise software projects typically range from $100K–$1M+. Smaller internal tools or integrations may start at $50K. Post-launch support and iteration usually costs $10K–$40K/month.
Every agency on this list has been reviewed by our editorial team. Rankings are based on our transparent methodology which evaluates credibility, outcomes, and reputation.
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