Hey, I'm Sasha Koss,
Here's what I do:

I'm a Singapore-based product engineer with 15+ years of experience building and shipping software products.

At this moment I run a small startup Mind Control, work on many open-source projects and sometimes help other companies to build theirs, too.

I created date-fns, a popular open-source project with 100M+ downloads per month. According to State of JS 2024 37% of all JavaScript developers regularly use date-fns.

I'm experienced in various technologies, from full-stack web and systems development to machine learning and game dev. My main tools are Rust, TypeScript, and Python. I also design and manage products as well.

Before 2017, when I started my independent career, I worked at Toptal as a team lead, managing a team of ~10 engineers. I joined the company in 2012 as a front-end lead and helped the company grow from a handful of engineers to 150+ people strong.

Before 2012, I worked as front-end engineer at Evil Martians, a leading product development consultancy. I contributed to many project including Groupon.