Developed and integrated multi-architecture Docker image build and CI enhancements for the LedgerHQ/speculos repository, focusing on supporting both arm64 and amd64 platforms. Leveraged Shell scripting and YAML to implement digest-based pushes, manifest creation, and improved image tagging within GitHub Actions workflows. Introduced an arm64 host builder to the CI pipeline, enabling builds on aarch64 runners for improved release parity and faster cycles. Hardened CI processes by refining push-switching logic and adding metadata prefetching, which accelerated pull request validation and reduced pipeline duration. The work resulted in more reliable artifact delivery and consistent build processes across multiple architectures.