As a team of 4 people, we are building a bridge between the Tezos and Everscale blockchains. I am responsible for the necessary smart contracts in Solidity and LIGO. The relay sever is being written in Go. Link to project overview page.
As a team of 5 people, we built a peer-to-peer messaging app that uses websockets to send messages between users. The authentication service is written in Java and uses JWT tokens. The node server that handles websocket communitation is written in Go. It supports chat rooms with multiple people and relaying messages between nodes.