Erwan Viollet developed robust backend features for DataDog’s datadog-ci and dd-trace-rb repositories, focusing on reliability and performance. For datadog-ci, he enhanced symbol upload workflows by implementing Breakpad parsing, PE symbol detection, deduplication, and format validation using Node.js and TypeScript, resulting in more reliable CI pipelines and improved user experience. In dd-trace-rb, Erwan prototyped deferred heap allocation recording and heap profiling for Ruby 4.x, integrating C and Ruby extension development to support cross-version compatibility and production stability. His work demonstrated depth in memory management, profiling, and backend development, with careful attention to code quality, maintainability, and documentation.