We use SCRUM to manage tasks and project cycles. We’re using Jenkins for CI/CD, Github for version control, PostHog for analytics, Wagmi, Ethers.js & WalletConnect for web3 compatibility. 
Our front-end tech stack includes React, TypeScript & PostCSS.
Our backend tech stack includes Node.js, TypeScript, MongoDB, GraphQL

(We can provide full documentation and architecture breakdown in a separate document as well as our operational policies and practises).