Worked on OpenWRT packages to implement hardware-backed authentication in OpenSSH by integrating FIDO U2F and FIDO2 token support through the ssh-sk-helper package, using C and Makefile for build system configuration and package management. The feature enabled ecdsa_sk and ed25519_sk key support but was reverted after identifying packaging gaps, demonstrating a full feature lifecycle from delivery to rollback planning. Later, contributed to the karlseguin/quickjs repository by addressing a memory management bug in dbuf_default_realloc, ensuring safe handling of zero-size reallocations. This work improved allocator robustness and code reliability, focusing on C programming and careful memory management practices.