Micra.js
A lightweight zero-dependency JavaScript library that adds reactivity to HTML your server already renders. More than jQuery sprinkles. Less than a React SPA.
Hey, I'm Denis Fedosov-Ledovskikh.
I build small tools that strip away the overhead
Open-source frameworks, CLIs and web apps. Two decades of making things for the web.
- 20+years building
- 49public repos
- 129open-source contributions
Contributor to iTerm2, Huly & Archestra.
Things I'm building
Small, self-contained products. Each one removes something that gets in the way.
Sumi
An open-source CLI that streams CPU, memory, disk and network metrics straight to your terminal. Optional cloud backend adds history and Telegram alerts.
Synco
Coordinate a team across timezones on a single 24-hour timeline. State is encoded in the URL, so a dashboard is just a link you share.
Inbox
Privacy-first self-hosted notes and task tracker
Case studies
All cases →Deeper write-ups of work I've shipped — the problem, the approach, the result.
Generating Light and Dark Themes for an Archestra AI
You can't just invert the lightness — a deep dive into theme generation
Theming System for Real-World Products
Building a unified, scalable theming system that balances brand individuality with design consistency across a multi-tenant product.
Design System - Card Component Evolution
Moving from Bootstrap HTML templates to a modern, scalable component system that could handle complex financial data visualization
About
I've been making web services for two decades — long enough that the number scares even me. I started as a webmaster, grew into full-stack work, and led engineering teams along the way.
These days I mostly build my own tools: things I wanted to exist, kept small on purpose, and often open-sourced. The thread through all of them is removing friction — no heavy build, no mandatory cloud, no weight you didn't ask for.
Work with me
Beyond my own products, I take on a small number of engagements.
Mentoring
AI, coding and vibe coding — for people who want to automate their own work and ship faster.
Technical consulting
Architecture, audits and advisory for founders, CTOs and product teams.
What colleagues say
I worked with Denis for almost 6 years. Along with his strong professional skills, he's a great communicator who's always open to sharing ideas, and he's full of good suggestions. Over the years, I saw how he stayed calm in tough situations and guided people toward results.
I worked with Denis for several years, and I can recommend his skills in creating beautiful and solid UI.
Denis has a knack for picking up new skills quickly. Whenever we faced something new, he'd dive right in, learn it, and apply it to our projects without missing a beat. He's also an amazing team player — always there to help, share a laugh, and make the workload feel lighter for everyone.
Working with Denis for almost 4 years was a highlight for me. He's got this unique talent for breaking down complex stuff into something doable — and then not just stopping there, he makes sure it works and keeps tweaking until it's just right. Highly recommend him.