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ranashivam338

Shivam R

@ranashivam338

Android and Backend Developer, POS, Payments, Complete Systems

India
English, Hindi
About me
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.... Read more

Skills

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ranashivam338
Shivam R
Offline • 

See my services

Mobile App Customization
I will integrate printer, scanner or bluetooth device into your android app
From$25 / projectMore details
Mobile App Customization
I will integrate payment sdk or build your android pos app
From$40 / projectMore details

Portfolio

Work experience

NeoSOFT

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.

7System_Technology Pvt Ltd

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.

CQLsys_Technologies

Freelance Android Developer

CQLsys Technologies • Freelance

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.