Observed Signal · Jul 15, 2026 · M&A - Announced · Source: Trending Topics · Impact: 2/5 · Sentiment: Positive
Callstack Acquires Margelo to Advance React Native Engineering
Polish software specialist Callstack has acquired Vienna-based engineering firm Margelo, with the transaction valuing Margelo at over €20 million. Both companies specialize in React Native, a cross-platform framework for building mobile apps. Margelo is renowned for its open-source libraries including VisionCamera and react-native-mmkv, which together have accumulated over 140 million downloads. The acquisition aims to broaden Callstack's technology portfolio and enterprise client base, while Margelo's founder Marc Rousavy will remain on board to lead continued development. The deal follows Callstack's growth investment from Viking Global Investors in 2025, which valued the company at approximately €120 million, and is positioned as a strategic response to AI-driven changes in software development.
Consolidation in React Native engineering services, relevant to the mobile app development and technology infrastructure ecosystem, with indirect implications for app-based advertising and digital experiences.
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Key Takeaways & Evidence Grounding
- Callstack acquires Margelo for over €20 million.
- Margelo has 39 senior developers and over 420 million npm downloads.
- Callstack employs more than 200 people and serves over 100 enterprise clients.
- The deal was announced on July 15, 2026.
- Marc Rousavy will remain with the company and keep a significant equity stake.
Connected Companies & Entities
8 Entities mapped“Der polnische Software-Spezialist Callstack übernimmt das Wiener Engineering-Unternehmen Margelo....”
“Margelo mit Sitz in Wien ist in der React-Native-Community vor allem durch seine Open-Source-Bibliotheken bekannt....”
“Damals stieg der US-Fonds Viking Global Investors mit einem Wachstumsinvestment ein, das Callstack laut eigener Aussendung mit rund einer ha...”
“Callstack wurde 2016 in Wrocław gegründet, wenige Monate nach der Veröffentlichung von React Native durch Meta....”
“Als Referenzen nennt Margelo unter anderem Discord, Coinbase, Expensify, MetaMask, Rainbow, VSCO und WalletConnect....”
“Als Referenzen nennt Margelo unter anderem Discord, Coinbase, Expensify, MetaMask, Rainbow, VSCO und WalletConnect....”
“Als Referenzen nennt Margelo unter anderem Discord, Coinbase, Expensify, MetaMask, Rainbow, VSCO und WalletConnect....”
“Als Referenzen nennt Margelo unter anderem Discord, Coinbase, Expensify, MetaMask, Rainbow, VSCO und WalletConnect....”
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