Callstack
Shipping products at AI speed
Wroclaw, Poland · Founded 2016 · $125.0M raised
- 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
Totals include recorded grants and other qualifying funding, not just equity. What counts toward funding.
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, Poland, 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.
Tech & App Stack
11 technologies & apps tracked
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Funding History
Jul 2025
Investors
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