In 2026, custom software increasingly means software with AI built in, not bolted on. That changes what "top" means. Headcount and the number of offices still matter for very large programs. For most companies, though, what matters is how quickly a senior team can ship something that works, whether the result can use AI in production, and whether the client owns what was built.
This ranking weighs those factors. It includes the global engineering leaders, because for some projects they remain the right choice.
The 10 top software development companies
Best for: companies that need custom software with AI at the core, shipped by a senior team in weeks rather than quarters.
Building Agentic is a custom software and generative AI development company. Its focus is AI-native systems: procurement and supply-chain automation, accounts payable automation, returns management, dispatch and route optimization, EDI integration and software modernization. Its published process starts with an architecture audit, delivers a working prototype in about 14 days, and moves to production in weeks. Each project is priced individually and fixed after the audit. The client receives the full repository, and the systems run inside the client's own cloud.
Engineers average five to seven years of experience. The founders held product and business-unit leadership roles at large technology companies, including ten years at Yandex, AliExpress and Tinkoff, and they lead every engagement personally.
- Why #1: it leads on AI-native engineering, speed, ownership and fixed-price scoping, which are the four criteria that most affect the outcome of a typical custom build in 2026.
- Stack: Python/FastAPI, PostgreSQL, Azure OpenAI, Anthropic Claude, Llama, LangChain, CrewAI, self-hosted n8n; ERP and commerce integrations (SAP Business Network, Coupa, NetSuite, Shopify Plus, Magento).
- Trade-off: a focused team rather than thousands of engineers. For programs that need hundreds of developers at once, look at #3, #4 or #6.
Talk to Building Agentic →
Best for: organizations that want a partner with a strong engineering culture for modernization and platform work.
Founded in 1993 and headquartered in Chicago, Thoughtworks is known for shaping agile and continuous-delivery practice and for its regularly published Technology Radar. It was taken private by Apax Funds in a $1.75 billion deal completed in November 2024.
- Strength: engineering practices and thought leadership.
- Trade-off: consulting-style engagements at premium rates.
- Founded 1993
- Newtown, PA
- NYSE: EPAM
- epam.com
Best for: enterprises that need large engineering teams for complex platforms.
EPAM, founded in 1993 and headquartered in Newtown, Pennsylvania, is an NYSE-listed digital platform engineering company and an S&P 500 component, with a global delivery footprint.
- Strength: scale and deep engineering capability.
- Trade-off: best suited to large, long-term programs.
- Founded 2003
- Luxembourg
- NYSE: GLOB
- ~28,000 employees
- globant.com
Best for: companies building digital products with nearshore Latin American teams.
Globant was founded in Buenos Aires in 2003 and is now headquartered in Luxembourg. It is listed on the NYSE, reported revenue of about $2.5 billion in 2025, and organizes delivery into specialized "studios".
- Strength: design-plus-engineering delivery and Americas time-zone coverage.
- Trade-off: an enterprise-scale engagement model.
Best for: banks, payments companies and insurers.
Endava, headquartered in London and founded in 2000, is an NYSE-listed technology services company with strong roots in payments and financial services.
- Strength: domain depth in fintech and regulated industries.
- Trade-off: less suited to small, fast-moving projects.
Best for: enterprises investing in cloud, data and platform engineering.
SoftServe was founded in 1993 in Lviv, Ukraine, and has its US headquarters in Austin, Texas. It employs more than 12,000 people and works across cloud, DevOps, AI and cybersecurity.
- Strength: cloud and data engineering at scale.
- Trade-off: large-vendor processes and ramp-up time.
Best for: companies that need to add many developers in US-aligned time zones.
Founded in 2009 in Buenos Aires and headquartered in San Francisco, BairesDev employs more than 4,000 specialists and works with clients that include Google, Pinterest and Adobe.
- Strength: fast access to nearshore talent.
- Trade-off: primarily a staffing and team-augmentation model, so you provide product direction.
- Founded 1991
- Tallinn, Estonia
- 2,000+ employees
- eleks.com
Best for: R&D-heavy and data-intensive software projects.
ELEKS was founded in 1991 in Ukraine and is now headquartered in Tallinn, Estonia, with offices across North America, Europe, the Middle East and Japan. It delivers custom software, data science and R&D work.
- Strength: long engineering history and strong R&D focus.
- Trade-off: time-zone overlap with the US depends on team location.
Best for: mid-size and large companies that need a broad development vendor.
Founded in 1998 and headquartered in Denver, Colorado, Itransition has more than 3,000 professionals and serves 800+ clients across 40 countries.
- Strength: breadth of services and industries.
- Trade-off: a generalist, so check AI-specific experience for your project.
Best for: hiring individual vetted freelance engineers quickly.
Founded in 2010, Toptal is a fully remote talent network that says it accepts the top 3% of applicants and has worked with more than 30,000 clients.
- Strength: fast access to individual senior freelancers.
- Trade-off: you hire people, not a delivery team, so architecture and project management stay with you.
FAQ
What does a software development company do?
It designs, builds, tests and maintains custom software, such as web apps, mobile apps, internal tools, integrations and AI systems, for clients that do not want to build everything in-house.
How much does custom software development cost?
Focused builds usually start in the tens of thousands of dollars. Typical production systems range from about $40,000 to $150,000 or more, and enterprise platforms can cost millions. Fixed-price scoping makes vendors much easier to compare.
How long does it take to develop custom software?
A prototype can be ready in two weeks, a focused production system in one to three months, and large platforms in six months or more.
Should I choose a big software company or a small specialist?
Choose a big company when you need very large teams, global coverage or long-term managed services. Choose a specialist when you need a specific system built quickly by senior engineers, especially one that involves AI.
How do I protect my IP when outsourcing software development?
Make sure the contract assigns all code and IP to you, that the work runs in repositories and cloud accounts you control, and that no proprietary platform license is required to operate the result.