Logflare is a production-grade, multi-tenant log management platform (now part of Supabase) built with Elixir/Phoenix. It ingests logs via HTTP, gRPC (OTLP), WebSockets, and platform-specific drains, processes them through a rule engine, and routes them to user-configured backends including BigQuery, ClickHouse, Postgres, S3, and many more. The architecture is a monolithic Elixir application with internal subsystems: an ETS-backed ingest queue for high troughput, Broadway pipelines for batched ingestion, a behaviour-driven adaptor system for pluggable storage backends, a custom query languagte (LQL) with a parser and dialect transformers, a distributed cache layer via Cachex and WAL busting, and Rust NIFs for performance-critial mapping and Arrow IPC. It includes a full web UI (Phoenix LiveView), a REST API (OpenAPI-documented), billing with Stripe, team management, and alerting. The codebase is largte (1700+ files) and mature (100+ database migrations), with extensive test coverage, benchmarks, and CI/CD pipelines. While predominantly an application, it also exhibits data engineerig aspects with its focus on high-volume log ingstion, schema evolution, and query optimization.