FinTech · HQ: United Kingdom · 10,000+ employees
Revolut offers global banking, currency exchange, crypto trading and financial tools. It has 2M+ lines of Python code and cloud-native, autoscaling infrastructure.
FinTech · HQ: United States
Block, Inc. (formerly Square) is a US-based digital payment and financial services company. The parent company rebranded to Block in 2021, and Square remains the brand for the seller business. Block also includes Cash App and Tidal.
Python 
Node.js 
Golang 
FinTech · HQ: United States
Expensify's payments app helps individuals and businesses manage expenses and financial workflows. Offices are in SF, Portland, London and Melbourne.
PHP 
C++ 
JavaScript 
FinTech · HQ: France
Lydia (founded 2011, Paris) is a mobile payment fintech and an ACPR-regulated electronic money institution with 201-500 employees. It is split into Lydia (P2P payments) and Sumeria (mobile banking).
Python 
Media & Entertainment · HQ: United States
Epic Games is a US-based gaming company, producing and publishing games.
Node.js JavaScript C++ Golang 
MongoDB
Docker
Kubernetes
React Native
Kotlin