Observed Signal · Jul 20, 2026 · M&A - Announced · Source: Trending Topics · Impact: 2/5 · Sentiment: Positive
Callstack Acquires Austrian React Native Firm Margelo
Callstack, a Polish software company specializing in React Native, is acquiring Margelo, an Austrian engineering firm known for open-source libraries such as VisionCamera and react-native-mmkv. The deal values Margelo at over 20 million euros. Margelo's founder Marc Rousavy will remain with the company, overseeing library development and retaining a shareholder stake. Callstack, founded in 2016, has over 200 employees and serves more than 100 enterprise clients. The acquisition follows a growth investment from US fund Viking Global Investors in summer 2025, which valued Callstack at approximately 120 million euros. Both companies cite AI-driven shifts in software development, emphasizing architecture and performance. Margelo's open-source projects will remain open source.
Niche acquisition of a React Native engineering firm; limited direct impact on AdTech industry but relevant to mobile app infrastructure.
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Key Takeaways & Evidence Grounding
- Callstack is acquiring Margelo, a Vienna-based React Native engineering firm.
- The deal values Margelo at more than 20 million euros.
- Margelo is known for open-source libraries like Nitro, VisionCamera, and react-native-mmkv.
- Marc Rousavy, Margelo's founder, remains with the company.
- Viking Global Investors made a growth investment in Callstack in summer 2025, valuing it at ~120 million euros.
Connected Companies & Entities
8 Entities mapped“Der polnische Software-Spezialist Callstack übernimmt das Wiener Engineering-Unternehmen Margelo....”
“Der polnische Software-Spezialist Callstack übernimmt das Wiener Engineering-Unternehmen Margelo....”
“Damals stieg der US-Fonds Viking Global Investors mit einem Wachstumsinvestment ein, das Callstack laut eigener Aussendung mit rund einer ha...”
“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....”
“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....”
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