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Shivam R
@ranashivam338
Android and Backend Developer, POS, Payments, Complete Systems
Indien
Englisch, Hindi
Über mich
I'm Shivam, an Android and backend developer with 3+ years of production experience. I build complete systems: the Android app, the backend (Node.js REST APIs, WebSockets), database design and, with my own web designer and front-end developer, the web admin panel. My specialty is Android POS and payment apps: card (EMV, ISO 8583) and UPI payments, thermal printers, scanners, fingerprint devices, kiosk mode and MDM. Big project or small fix, you get clean code, clear updates and on-time delivery.
Kompetenzen
Shivam R
offline •
Meine Dienstleistungen
Mobile App Anpassung
I will integrate printer, scanner or bluetooth device into your android app
Mobile App Anpassung
I will integrate payment sdk or build your android pos app
Portfolio
Arbeitserfahrung
Android Developer
NeoSOFT
Mar 2025 - Jul 2026 • 1 yr 4 mos
Built enterprise Android apps for POS terminals used in payments and Public Distribution System (PDS) operations. Implemented card (EMV, ISO 8583), UPI and cash payment flows secured with AES, SSL pinning and JWT. Single-handedly built a remote diagnostics system (WebSocket + Accessibility Service with backend canvas mapping) plus task-based payment diagnostics. Built Device Owner, kiosk mode and MDM features, and integrated Bluetooth, USB, RS232, NFC, thermal printers, fingerprint (UIDAI RD Service) and iris scanners, and weighing scales.
Android Developer
7System Technology Pvt Ltd
Feb 2024 - Jan 2025 • 11 mos
Solely responsible for 7Sale, an enterprise CRM app for FMCG companies, built in Java. Modules for attendance, leave, orders, tasks, inventory, ledger, reports and performance dashboards. Geo-verified attendance with Google Maps, geofencing and Fused Location, plus face verification with Regula Face SDK. Firebase (FCM, Analytics, Crashlytics, Realtime Database), PDF report generation and REST API integration.
Freelance Android Developer
CQLsys Technologies • Freiberufler
Aug 2022 - Feb 2023 • 6 mos
Developed a real-time group chat application using Kotlin, Firebase Realtime Database and Firebase Cloud Messaging (FCM). Implemented REST API integration, background synchronization, push notifications, media sharing and scalable data loading.
