KostLabs is an R&D organization building open-source libraries, developer tooling, and everyday applications — all grounded in engineering best practices and a commitment to quality at low cost.
What we do
KostLabs is an R&D organization that creates open-source libraries and tools for developers, as well as practical applications for everyday people. We believe great software doesn't have to be expensive — it just has to be built right.
Everything we ship is grounded in established engineering principles, reviewed for security, and designed to last. Whether it's a Go library for your backend or an app for your phone, the standard is the same.
We research, prototype, and ship — not just plan.
All libraries are freely available and community-driven.
From developer tools to consumer apps — built for real people.
Best practices baked in — delivered at the lowest reasonable cost.
Open-source projects
Libraries and tools designed around best practices — free to use, free to contribute.
A simple JSON-based structured logger for Go. Consistent, observable log output without ceremony.
View projectAWS SSM Parameter Store integration for Go applications. Secure secret management with minimal configuration overhead.
View projectAnd more
KostLabs is continuously growing. Explore the full organization on GitHub to see everything we're working on — and consider contributing.
How we work
Two sides of the same coin — how we engineer software, and how we work with the people we build it for.
Each piece of code does one thing well. No hidden dependencies, no spaghetti — changes stay contained and predictable.
Security isn't bolted on at the end. It shapes the architecture from day one — so you don't find out about gaps in production.
When something goes wrong at 3am, you need to know what happened. Structured logs, traces, and typed errors — always.
Code is read far more often than it's written. We write for the next developer — clear naming, consistent structure, no clever tricks.
Errors are handled explicitly — categorized, surfaced, and explained. Nothing fails quietly and carries on like nothing happened.
Conventional commits, semantic versioning, automated changelogs. Six months from now you'll know exactly why a change was made.
No account managers in the middle. You talk to the people actually building your product — fast decisions, no telephone game.
Before writing a line of code, we make sure we understand what you actually need — not just what you asked for.
We deliver working software early and often. You see real progress, can give feedback, and never wait months to find out the direction was wrong.
No inflated retainers or hidden costs. We scope honestly, bill what was agreed, and tell you upfront if something changes.
Work with us
Beyond open-source, KostLabs takes on custom development projects. Whether you need a backend service, an internal tool, or a full product — we bring the same quality standards that go into our open-source work.
We keep teams small, communication direct, and focus on delivering real value rather than burning budget on overhead.
Contact UsAPIs, microservices, cloud infrastructure, DevOps pipelines — built to run reliably in production.
Web and mobile applications with clean UX — designed for real users, not just technical audiences.
Architecture reviews, code audits, security assessments — a second set of experienced eyes on your system.