Custom software, built and defended since 1994

Full stack engineering from a firm that has shipped enterprise software for three decades: front ends people want to use, back ends that hold up, and APIs that make both of them useful, with security built in by our own cybersecurity practice.

  • Enterprise software since 1994
  • Microsoft Cloud Solution Provider
  • CISSP and CISA certified security leadership
  • Fortune 500 clients across North America
The practice

Thirty years of turning problems into production software

From enterprise applications and customer-facing portals to intelligent automation and cloud-native platforms, Winmill translates complex business problems into software that ships. We can augment your team with the specialists you’re missing or own the full delivery end to end.

And because our cybersecurity practice lives in the same building, security review isn’t a phase at the end. It’s the same firm reading the code.

Engineering standards

Every build ships the same disciplined way

Agile Scrum with real sprint reviews. Source control in Git, in repositories under your own accounts, so the code is yours from the first commit. Infrastructure as code deployed through Azure DevOps or GitHub. REST APIs documented to the OpenAPI standard. Versioned database migrations. And before release, load and stress testing with a staged concurrency ramp held at peak, producing a written report covering requests served, rejected connections, and response times.

Unglamorous disciplines, in writing. They’re why our systems still run years later.

Why Winmill

Fifty thousand firms build software. Here is the difference.

Anyone can staff a project. The question is who answers for the outcome. Winmill has been accountable for production software since 1994, and it shows up in how we contract, staff, and ship.

Built and defended under one roof

The engineers who build your system share a hallway with a cybersecurity practice that penetration tests for a living. Security review happens inside the build, not as an upsell at the end.

Senior engineers, no pyramid

The people who scope your project are the people who write the code. No partner-sells-junior-builds model, no bench on your invoice, and estimates made by the ones accountable for hitting them.

Outcomes you can read

Thirty years of shipped systems, with results published as success stories: a front end replaced for 30 million monthly users, a rebuild that reached 99.999 percent availability, an MVP that became a funded product.

A price you can plan around

Fixed price with a not-to-exceed cap and dates set at kickoff. The code lives in your repositories from day one, so you own everything even if you never call us again.

What we build

The work we’re asked to do most

Web applications and portals

Customer-facing and internal applications built on modern frameworks, from React front ends to .NET and Node back ends, designed for the load you actually expect.

APIs and integrations

API-first design that leaves systems loosely coupled and ready to connect: web, mobile, and third parties, documented to OpenAPI so your team can build against them too.

Mobile applications

Native iOS and Android in Swift and Kotlin, or cross platform in React Native when one codebase makes more sense. We’ll tell you which, and why.

Modernization

Legacy applications rebuilt without interrupting the business, including systems whose original developers are long gone. PHP, COBOL, and everything in between.

Microservices, only where they make sense

Small, independently deployed services for systems that need to scale in pieces. And when a well-built traditional application is the better answer, we say so.

Documentation your team keeps

Architecture documents, API references, and knowledge transfer as deliverables, not afterthoughts, so nothing about your system lives only in our heads.

Delivery models

Work with us the way your project needs

Embedded teams

Full stack teams that adopt your processes, attend your standups, and work side by side with your engineers.

Targeted augmentation

The one or two specialists your roadmap is missing, without the overhead of a full engagement.

Lower cost, same accountability

Nearshore engineering that cuts the cost of the build, not the standard of it: a shared time zone, English and Spanish, and US-based delivery management accountable for quality and dates.

Our work

Development success stories

Common questions

Frequently asked questions

Who owns the code?

You do. Source control lives in repositories under your own accounts from the first commit, and infrastructure is defined as code you keep. There’s no handover event because there’s nothing to hand over.

Microservices or a traditional application?

It depends on how your system needs to scale, and we’ll give you a straight answer. Microservices buy independent scaling and deployment at the cost of operational complexity. Plenty of successful systems don’t need them, and we build both.

What do we receive besides the software?

A written architecture document, OpenAPI documentation for every API, versioned database migrations, and a load and performance test report covering requests served, rejected connections, and response times. Everything is written to be read by your team and your auditors.

Can you work with our existing team and codebase?

Yes, and it’s most of what we do. We adopt your processes and tools rather than imposing ours, whether that’s an embedded team, one specialist, or a nearshore group under US project management.

Do you work with existing applications?

Yes, and most engagements start there. We modernize, extend, and take over systems other teams built: a deprecated front end replaced for 30 million monthly users, a COBOL-era system rebuilt as cloud-native services, a content platform migrated with zero disruption. Greenfield is the exception, not the rule.

Why not hire our own developers?

If you have years of steady product work ahead, you should. But recruiting a senior team takes months and carries permanent payroll, and most projects need five skill sets for six months, not five hires. We arrive as a team that has shipped together, transfer knowledge as we go, and hand off cleanly. Many clients do both: we build while their hires ramp.

How do you compare to a large consultancy?

Same class of work, no pyramid. There is no partner-sells-juniors-build model here: the engineers who scope your project write the code, so estimates stay honest and the invoice has no bench in it. And when the work needs security testing, that is our own practice, not a subcontractor.

Why not just use freelancers?

A freelancer is a person. This is a system: code review, automated testing, security review, documented handoffs, and continuity when someone is out. Freelancers are the right call for small, contained tasks. Software that has to survive years of change and audits needs a team with process and a firm behind the contract.

Bring us the system you wish you had

Describe what you’re trying to build or replace, and we’ll bring the right engineers to the first conversation. We respond within one business day.

Start the conversation Not ready for a full build? Start with an MVP