Worked on the kolyma-labs/instances repository to provision and configure new mail users within the mail server, focusing on onboarding efficiency and secure credential management. Implemented domain associations and secret-key based passwords for the bemeritus and letrec accounts, reducing manual steps in the user setup process. Leveraged Nix for declarative NixOS configuration, applying DevOps and system administration practices to ensure reliable mail delivery and end-to-end traceability through linked Git commits. The work addressed the need for streamlined account provisioning without introducing new bugs, demonstrating attention to security and maintainability in mail server configuration and user management workflows.