Anton Maydell
a software developer who worked with Telegram in its early days; current position unknown, probably works on the API if still at Telegram
Alexander Zinchuk
author and maintainer of Web A who is also allegedly working on MyTonWallet, a TON-centered cryptocurrency wallet app
Eduard Kuzmenko
author and main maintainer of Web K
Evgeny Nadymov
a Telegram front-end developer who resides in the United States and went to the same university as Pavel Durov; creator of Telegram's app for Windows Phone; probably contracting for xAI, a company owned by Elon Musk, to develop a messaging app called X Chat
Vasiliy Babich
Also known as Vasya Babich, the creator of the multi-platform Telegram Desktop client. He still actively works on this client at Telegram.
Mike Renoir
The developer of the official Telegram for macOS client. Started the project as an unofficial client, until he was hired by Telegram to work on it.
Vitalik Valtman
a software developer working at Telegram
Artem Kolnogorov
A Russian software developer working on Telegram, probably on the front ends. He is the one behind the Instant View Platform, telegra.ph, telesco.pe, and potentially the front ends of other Telegram platforms like Fragment.
Ilya Laktyushin
a developer working on Telegram’s iOS app
Andrey Lopatin
a Russian software developer who used to work at Telegram in its early days
Arseniy Smirnov
a Russian software developer working at Telegram
Igor Zhukov
a Russian software developer working on Telegram’s API (back end)
Ilya Samorodov
a Russian developer who used to work on Telegram’s Android app
Dmytro Karaush
a Ukrainian developer who works on Telegram's Android app
Nikolay Kudashov
Also known as DrKLO, a Russian software developer who created a Telegram app for Android in a contest, which was then made the official Telegram Android app. He continued working on it until 2021.
Ali Fareed
a developer working on Telegram’s iOS app
Gregory Klyushnikov
an ex-Telegram developer who used to work on Telegram calls before they were migrated to WebRTC
Fela
an Italian software developer who built Unigram, a third-party Telegram client for Windows that was later officialized