Sakjrn contributed to msupply-foundation/open-msupply by developing date-based filtering for supplier returns and requisition requests, enhancing data discovery and user workflows. They improved number utilities to address floating-point precision, adding comprehensive tests for edge cases. Sakjrn strengthened hardware integration by hardening barcode scanner imports and ensuring Electron API null-safety. In cloudflare/workers-sdk, they resolved CommonJS JSON require issues in the module fallback service, adding tests to verify module resolution. Their work included standardizing module packaging, improving Jest test isolation, and updating documentation and onboarding guides. Sakjrn utilized TypeScript, JavaScript, and Node.js, demonstrating depth in both feature development and code reliability.