Ethereum, Blockchain Security, and Crypto Development by Lefteris Karapetsas

Lefteris Karapetsas is the founder of Rotki, an open-source portfolio and accounting tool for crypto assets. His career began as a core developer at the Ethereum Foundation and later at ConsenSys, where contributions included improvements to Geth and infrastructure tools supporting the Ethereum network. Rotki has grown into a respected application with tens of thousands of downloads and an active GitHub community exceeding 1,200 contributors and testers. The project offers transparency for DeFi users and institutional traders navigating tax and compliance requirements.

Karapetsas regularly presents at Ethereum community events, including Devcon and EthCC, where his talks attract audiences of more than 300 developers. Income comes from Rotki subscriptions, grants, and speaking engagements, providing a mid-six-figure EUR annual revenue stream. With a strong following of over 40,000 Twitter users, Karapetsas has established himself as a central advocate for privacy, transparency, and user-controlled crypto accounting. His role in sustaining open-source projects ensures continued impact on DeFi’s evolution and regulation.