June 2026: Across mastra-ai/mastra and better-auth/better-auth, delivered critical vector-search accuracy improvements and safer deployment safeguards, with cross-repo collaboration and robust test coverage. Key outcomes: - Implemented metric-aware distance-to-score conversion for ChromaVector.query() (mastra): per-metric scoring for cosine, dotproduct, and euclidean; added a pure helper and updated configuration-driven logic to derive the metric. Missing distances now map to 0. Full test suite validated the change. - Strengthened change governance and deployment safety by honoring disableMigration: true tables in plugin schemas for migrations and schema generation (better-auth); propagated through core processing and CLI generators; added tests for Drizzle and Prisma that skip these tables. - Demonstrated business value through improved search relevance, reduced risk in migrations, and better cross-store portability across multiple vector stores. Technologies/skills demonstrated: - TypeScript, test-driven development (unit/integration tests), and changeset workflow. - Cross-repo collaboration, changelog updates, and end-to-end validation of performance-critical features.