Worked on the zanfranceschi/rinha-de-backend-2025 repository to deliver participant submission scaffolding and a reproducible local development environment for Rinha de Backend 2025. The solution established two Go-based API instances managed behind an HAProxy load balancer, enabling rapid onboarding and consistent testing for new participants. Docker and docker-compose were used to orchestrate the environment, while configuration was managed through HCL and YAML files. Supporting documentation, including a detailed README and configuration assets like haproxy.cfg, was provided to guide users. The focus remained on feature delivery and environment stability, with no major bugs addressed during this period.