About Sumon
Senior Android Engineer | Kotlin, Flutter | Backend & Infrastructure Experience
Senior Android Engineer with 8+ years of experience shipping production apps in Kotlin, Java, and Flutter. Delivered 15+ applications across e-commerce, ERP, VPN, and field operations for enterprise clients — with apps collectively achieving 200k+ Play Store downloads globally. Hands-on across the full stack — from Android architecture to backend integration, Docker deployments, and Linux VPS management.
Years
Experience
Shipped
Projects
Total
Downloads
Experience
Dec 2021 - Present · 4 yrs 11 mos
Senior Engineer
B-Trac Solutions Ltd
Led development of 3+ enterprise Android applications in Kotlin serving 10k+ users, with real-time data sync and offline-first functionality.
Collaborated on production pipeline setup — Docker Compose, Nginx reverse proxy, and SSL configuration on Linux VPS.
Reduced app crash rate from ~13% to under 2% via Firebase Crashlytics monitoring and proactive hotfix releases.
Introduced MVVM + Clean Architecture, cutting bug regression rate by ~40% and reducing developer onboarding time.
Jun 2020 - Nov 2021 · 1 yr 6 mos
Software Engineer
Infinity Infotech Ltd
Delivered 4 Android applications in Java, and Flutter for clients in retail, logistics, and service industries.
Contributed to architecture planning and sprint estimation for 4 in-house products
Feb 2020 - Jun 2020 · 5 mos
Android Developer
Multibrand Infotech Ltd
Built 2 ERP mobile modules replacing paper-based workflows for 200+ field staff.
Maintained REST API integrations, resolving critical production issues within a 4-hour average SLA.
Sep 2018 - Feb 2020 · 1 yr 6 mos
Assistant System Engineer
Voicetel Ltd
Monitoring the network performance on a daily basis.
Taking care of routing and inter-connectivity issues.
Installing and maintaining the network monitoring, analysis, and reporting tools.
Jan 2017 - Dec 2019 · 3 yrs
Freelancer (Contractual)
Self-employed
Independently delivered 6+ Android apps — full lifecycle from scoping to Play Store release.
Handled Linux VPS server deployment for 3 client projects with repeat engagements from all clients.