I have been working on blockchain for more than 2 years. I have experience on Hyperledger Fabric, Sawtooth, Ethereum Web3, Bigchaindb and exploring Corda now. I have handled multiple projects over block-chain which required a high and complex level of engineering and design. These applications are available as a beta and proven to be very good pilots for the actual project. One of these is now in scaling mode which will have around 40K users by the first quarter of 2020.