# CTO - Leandros Holleman
Leandros is an Open Source Developer with 9 years of experience. He has extensive experience in DevOps and Cloud solutions, and 4 years of experience as a full-stack Cardano Developer. Leandros has made significant contributions to Cardano, not only operating a stakepool, but also launching two DApps on Mainnet and pioneering smart-wallet and multisig technologies.
Here are some of his most significant contributions to the Cardano blockchain:
* 4+ years of blockchain development, full-stack experience in both front-end and back-end.
* Lead developer for AnetaBTC V2, the largest wrapped BTC DApp on Cardano.
* Developed KeyPact (Broclan) Multisig Wallet on Cardano — one of the first user-friendly multi-signature wallets on Cardano.
* Pioneered smart-wallet functionalities on Cardano, enabling self-custodial programmable wallets via smart contracts. This technology is used for the KeyPact wallet and in work he is developing with GenWealth.
* Operates the BSP Cardano Stakepool, with 957 delegators and over 28M ADA staked.
LinkedIn
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