How much funding has Callstack raised?

Callstack has raised $125.0M in total funding, most recently a Private Equity round.

Who are Callstack's investors?

Callstack's investors include Viking Global.

Where is Callstack headquartered?

Callstack is headquartered in Wroclaw.

What industry is Callstack in?

Callstack operates in Developer Tools.

How many employees does Callstack have?

Callstack has 201-500 employees.

Callstack

Shipping products at AI speed

Wroclaw · Founded 2016 · $125.0M raised

Developer Tools

Headquarters: Wroclaw
Employees: 201–500
Founded: 2016
Business Model: B2B

Website: callstack.com
Total Funding: $125.0M
Last Round: $125.0M Private EquityJul 2025
Rounds: 1

About

Callstack is a Poland-based software consultancy founded in Wroclaw in 2016, just months after React Native was open-sourced by Meta, and has spent a decade helping enterprise teams build and ship cross-platform products with React Native. The company is a founding member of the React Foundation and a core contributor to React Native, and has since expanded into AI-native and agentic engineering, working with 100+ enterprise clients serving over 7 billion users. In 2025, Callstack was backed by Viking Global Investors to fund its next stage of growth.

Summary

Callstack is a Developer Tools company based in Wroclaw, founded in 2016. It has raised $125.0M in total across 1 round, most recently a $125.0M Private Equity round in Jul 2025. Investors include Viking Global.