From architecture to deployment, we help companies build reliable, scalable systems. A team of experienced engineers ready for your next challenge.
We've spent years building software that most people never see: the backend systems that keep hospitals running, the data pipelines processing millions of sensor readings, the distributed architectures behind logistics platforms that can't afford a second of downtime.
From firmware-level integrations to cloud-scale distributed systems, from real-time event processing to compliance-ready enterprise platforms. We decided to take that experience and channel it into something of our own. Coslen was born from the idea that this depth of knowledge shouldn't stay locked behind a single employer. It should be available to any company with a hard technical problem to solve.
So here we are, a team of engineers who've been in the trenches, ready for the next challenge. If you're building something ambitious, we'd love to hear about it.
AWS, Azure, .NET, K8s
Battle-tested systems
Remote-first, flexible
Embedded with yours
Scalable backend systems, cloud-native applications, real-time platforms, and data-intensive solutions. We architect for performance and resilience from day one, using proven patterns like event sourcing, CQRS, and microservices.
Modern stack: .NET, Node.js, Go, Python, React.js, Vue.js. Cloud-native with Kubernetes and Docker. But beyond technology, we bring production experience solving hard problems: horizontal scaling, zero-downtime deployments, distributed tracing, and compliance-ready architectures.
We follow a proven process that keeps things clear, predictable, and aligned with your goals at every step.
Every project starts with listening. We dig into your business goals, technical constraints, existing systems, and what success looks like, all before writing a single line of code.
Each project came with its own set of constraints. Here's how we approached them.
"Precision instruments in regulated lab environments can't run on software that's patched together over time. The full stack, from hardware drivers to enterprise automation APIs, had to be designed and built as a single, cohesive system."
The system covers the hardware driver layer, server infrastructure, desktop client, CI/CD pipelines, and an enterprise API that opens the instruments to automated lab workflows. It runs in environments where compliance and validation are non-negotiable, and every layer, from low-level device communication to the REST interface, had to meet those standards.
Key aspects
Technologies
We choose technologies based on what solves your problem best, not what's trending. Here's what we work with daily.
...and many more. We evaluate and adopt new tools as your project requires. Technology is a means, not the goal.
Whatever stage you're at, we start the same way: understanding your business. Let's have a conversation.
No pitch, no pressure. We'll listen to what you're building, share relevant experience, and see if there's a fit.
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