Thomas Lecavelier developed multilayer routing visibility for Traefik within the crowdsecurity/hub repository, focusing on backend development and log parsing using Go. He engineered support for parsing and logging complex routing chains, capturing root, intermediate, and leaf routers to align with Traefik’s model. His approach normalized log outputs across CLF and JSON formats, introduced detailed breakdown fields, and expanded test coverage to include multi-level router chains. By addressing edge cases such as duplicate leaf population and standalone chains, Thomas improved log consistency and reliability. His work demonstrated depth in backend engineering, testing, and robust handling of routing observability challenges.