Sasha Koss - Co-Founder at Chirr App

Sasha Koss

Co-Founder at Chirr App

Singapore

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Summary

🤩

Rockstar

Sasha Koss is a serial indie maker and co-founder with 16 years of software experience, now building AI-first tooling from Singapore through startups like Mind Control and Daisy Chain AI. He bootsrapped multiple products (including Chirr App) and combines hands-on full-stack development with product instincts to ship lightweight, practical developer and creator-focused tools. An active open-source contributor, Sasha has improved widely used JavaScript and Ruby projects—contributing tests, shims, and features to projects such as Zepto, es5-shim, date-fns, and underscore.string. His work spans front-end finesse, back-end reliability, and localization/timezone-aware utilities, showing attention to edge cases and compatibility. Comfortable toggling between founder-level strategy and deep technical execution, he treats engineering as product discovery and maintains a playful commitment to open-source writing and experimentation. A subtle strength: he focuses on developer ergonomics and reproducibility—turning messy integrations into maintainable, testable libraries and tools.

16 years of coding experience

Stackoverflow

Stats

15,837reputation

2.6mreached

12answers

14questions

Badges

google-cloud-firestore

top-5%

Github Skills (34)

javascript10

date-manipulation10

s510

testing10

text-manipulation10

typescript10

ruby10

localization10

typescript-types10

js10

nodejs10

typescripts10

zepto10

ecmascript10

json9

Programming languages (17)

C++CSSRustCElmGoHTMLReason

Github contributions (5)

date-fns/date-fns

Oct 2014 - Jan 2023

⏳ Modern JavaScript date utility library ⌛️

Role in this project:

Back-end Developer & Localization Specialist

Contributions:112 releases, 349 reviews, 821 commits in 8 years 5 months

Contributions summary:Sasha's contributions primarily involved the development of a modern JavaScript date utility library. This included implementing and testing core date functions like `addDays`, `isMatch` and also the integration of time zone support. The user also focused on localization, which suggests involvement in making the library accessible for multiple languages and regions. This includes implementation and testing of new locales.

javascript-datejavascriptutilitiesnodejsdate-fns

esamattis/underscore.string

Jan 2011 - Apr 2012

String manipulation helpers for javascript

Role in this project:

Full-stack Developer

Contributions:20 commits in 1 year 3 months

Contributions summary:Sasha primarily contributed to the development and maintenance of a JavaScript string manipulation library. Their work involved significant changes to the project structure, including modifications to the minified distribution file and the test suite. They implemented new string manipulation functions and fixed an issue related to titleize function. The user also integrated the library with both Underscore.js and Node.js environments.

javascriptstringutility

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