Anna Lankauf is the visionary co‑founder and former CEO of Callstack, the Polish software consultancy she helped scale from zero to a global leader in React Native and open‑source engineering. In 2025, Callstack was acquired by Viking Global Investors in a deal valuing the company at approximately PLN 500 million (~ €115 million)—marking one of the most notable exits led by a Polish female founder.

Anna is driven by the “discovery phase” of startups—the early chaos of shaping product-market fit—where she thrives by asking critical questions about clients, markets, and strategy. Her leadership style prioritizes transparency, data‑driven decisions, and fostering a culture where honest feedback and psychological safety enable innovation and initiative.

Current Roles & Investment Focus

• Business Angel & Mentor — since exiting Callstack, Anna has actively invested in several startups and is open to new opportunities across deep tech, AI, developer tools, and SaaS, with a special interest in the CEE ecosystem.
• Mentor & Board Advisor — she supports founders through hands‑on guidance, drawing on her background in psychology, UX strategy, and product leadership.

Anna combines the boldness of a builder with deep empathy and strategic insight—making her an invaluable partner for founders at the early stages of building tech ventures.