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Muhammad Sufyan Zafar is a skilled Crypto Engineer at Callsign since June 2022, where significant contributions include replacing the cryptographic library wolfssl with libressl and implementing various cryptographic functions in C. Prior to this role, Muhammad Sufyan Zafar served as a Senior Software Engineer at TPS Worldwide from October 2016 to August 2022, focusing on transaction processing across multiple payment schemes and acquiring channels, and held various engineering positions related to payment systems and architecture design. Muhammad Sufyan Zafar holds a Master of Science in Computer Science from the National University of Computer and Emerging Sciences and a Bachelor of Science in Computer Science from FAST NUCES.