Worked on enhancing the security of the moby/moby repository by implementing TLS security hardening through an upgrade of swarmkit to version 2.1.1. Focused on removing weak TLS cipher suites and tightening TLS configurations to reduce the attack surface and improve the overall security posture for users. Utilized Go for development, leveraging Go modules for dependency management and ensuring all updates were reflected in go.mod and go.sum files. Emphasized secure defaults and reproducible builds by verifying tests and documenting changes, prioritizing maintenance and risk reduction over new feature development or bug fixes during this period of focused security improvement.