sagarn62020

• Partnered with client stakeholders to scope & ship 5 data-intensive SPAs; kept a 100 % on-time delivery record. • Led Shipping CURA (Rails + React) end-to-end; added real-time shipment tracking and rate-shopping that lifted user engagement 25 % in 90 days. • Introduced PostgreSQL partitioning, caching, and proactive Sentry alerting—cut API P95 latency 40 % and maintained 99.9 % uptime. • Built RSpec-driven CI pipeline that lowered escaped-defect rate 30 %; demoed best practices across teams. • Evangelized Scrum ceremonies & story-pointing, boosting squad throughput 20 % over two quarters.

Led the development of mobile applications (https://arrowheads.co.jp) using Flutter and Django, boosting team productivity by 25% and reducing project delivery time by 40%. Implemented state management techniques (e.g., Riverpod, GraphQL), reducing app crash rates by 30% and enhancing app stability. Drove technical innovation and optimization within the startup, ensuring key project milestones were met and technical processes were continually improved.

Developed and optimized a matching service system to connect Japanese companies with developers, achieving a 90% success rate in effective pairings. Led the performance optimization of the https://offers.jp platform, resulting in a 150% speed improvement and significantly enhancing platform performance. Championed the migration from AWS S3 buckets to LocalStack, achieving substantial cost savings and improving development agility. Enhanced platform UI and integrated third-party services, resulting in a 28% increase in user engagement and a 20% reduction in page load times. https://note.com/overflow_inc/n/naec38f5a10c3