Vipul Kumar.
Android engineer who designs. Twelve years of apps at Delivery Hero, Airtel and Yatra, and now Kafka, a reading app I build alone for Android, iOS and web.
A reading app for Hindi, Urdu and English classics, built alone on Kotlin Multiplatform: 3,000 books, 1,000 audiobooks, rated 4.98 on Play.
Kafka · Founder and sole engineer. See the work
Built from scratch for Billion Hearts: a photo app that finds the faces in your gallery, sends each photo to the people in it, and lets only them talk about it.
Billion Hearts · Founding Android engineer · 2025 to 2026. See the work
Reelgood's Android app, built alone in Jetpack Compose in five months, async with a team in the US.
Reelgood · Sole Android contributor · 2023 to 2025. See the work
Tech lead for the rider app across three teams in Berlin. Led the redesign that sustained 120 percent order growth as riders went from 1.2M to 2.8M a month.
Delivery Hero, Berlin · Tech lead · 2020 to 2023. See the work
PicSee
India, remote
Twelve years, six products.
2014Where it started: the Android side of a location-tracking framework at a two-person startup, acquired by Zomato within six months.
Kafka, up close.
Android, iOS and web · 4.98 on Play
Its own book format and reader: justified text, drop caps, a page curl, selection across paragraphs, and a dictionary under every word.
90%
of Kafka's code is shared between Android and iOS
- 107K
- lines of shared Kotlin
- 8.6K
- Android only
- 3.4K
- iOS only
About.
I have built Android apps for twelve years: a travel app for slow networks at Yatra, the launcher on Airtel's Xstream stick and set-top box, the rider app behind Delivery Hero's brands in Berlin, and now Kafka, alone, on Android, iOS and web.
I care about what a user feels before they can name it: how text sets, how a screen moves, how an app holds up on a cheap phone at the end of a long day. I also write Urdu poetry; Kafka began as a place to read the poets I love.