Subramaniyan Marimuthu

Senior React Native Developer with 3.7 years of experience shipping iOS and Android apps across social, enterprise, and AI-powered products. Specialist in offline-first architecture, real-time systems, and OWASP-compliant mobile security hardening.

Proven track record: 25% faster load times, 15% fewer crashes, 20% shorter development cycles, and frame rate improvements from 38 to 60 fps on Android. Experienced in end-to-end ownership from architecture through App Store and Play Store release.

Senior React Native Developer at Agenciflow Private Limited (2024-11 – Present)

• Cut app load time by 25% by architecting a React Query caching layer, optimizing API payloads, and implementing FlatList windowing, directly improving first-session retention on iOS and Android.
• Reduced crash rate by 15% by instrumenting Sentry across 12 or more app modules and resolving the top 5 crash categories within 3 weeks; introduced Maestro UI test suites eliminating 70% of regression bugs across 25 or more critical user flows.
• Accelerated feature delivery by 20% by building a 40-plus component library and scalable design system adopted team-wide, eliminating duplicate code across 100 or more screens.
• Resolved rendering bottlenecks using Flashlight profiling, improving frame rate from 38 to 60 fps on mid-range Android devices, a direct fix to the top user complaint in app reviews.
• Reduced deployment effort from 4 hours to 15 minutes by automating App Store and Play Store pipelines with Fastlane and CI/CD, enabling same-day hotfix releases.
• Hardened app against OWASP Mobile Top 10 threats via SSL pinning, jailbreak and root detection with automatic session termination, JS obfuscation, encrypted keychain storage, and device-bound JWT tokens.

Associate React Native Developer at XBI4 Private Limited (2022-10 – 2024-10)

• Delivered a social media app from zero to live on both App Store and Play Store in 6 months, with multimedia uploads and real-time messaging built end-to-end on schedule.
• Achieved zero data loss throughout the entire live period by engineering an offline-first architecture with MongoDB Realm Sync and automatic conflict resolution for low-connectivity users.
• Secured the app with JWT authentication, role-based routing, and encrypted token storage, validated through internal code reviews and QA sign-off cycles.
• Reduced post-release bug count by 35% by implementing Detox end-to-end test coverage for 20 or more critical flows; used Firebase Analytics funnels to cut issue triage time from days to hours.

Bachelor of Engineering in Mechanical Engineering – Government College of Engineering, Bodinayakkanur (2016 – 2020)