Amundsen is a metadata-driven application developed by Lyft to solve data discovery challenges. It provides a search-based UI and uses a distributed architecture with various microservices to index and serve metadata from multiple sources. Key components include a metadata service using Neo4j, a search service using Elasticsearch, and a frontend. The tool has been hugely successful at Lyft and is now open source. Future work includes expanding metadata coverage and integrating with other tools.