Hi, I am Subhajit

I'm

About Me

I’m Subhajit Roy, an Android Developer passionate about building fast, intuitive, and reliable mobile applications. I enjoy turning complex business requirements into clean, scalable solutions that are easy to maintain and pleasant to use. My primary tools include Java, Kotlin, Flutter, and Node.js, and I’m always exploring better ways to write efficient, high-quality code.

Over the years, I’ve worked on a wide range of products, including payroll systems, POS billing software, pharma field-tracking apps, document management systems, and educational platforms. Each project has helped me strengthen my understanding of real-world workflows, performance optimization, and scalable app architecture.

I care deeply about user experience and believe that great apps should feel simple, responsive, and reliable. I focus on clean architecture, readable code, and long-term maintainability, making sure the products I build can scale as requirements grow. Whether it’s designing smooth user flows, optimizing performance, or integrating backend services, I aim to deliver solutions that add real value.

I enjoy collaborating with teams, learning new technologies, and continuously improving my craft. For me, development isn’t just about writing code — it’s about building products that people actually enjoy using.

Skills & Technologies

Mobile Development

Android, Kotlin, Java, Flutter, Dart, MVVM, UI/UX & Firebase

Backend & Frontend

Node.js, Express.js

AI & Developer Productivity

Copilot tools & DeepSeek (Prompt Engineering, AI-assisted Coding)

Databases & Cloud

MySQL, Firebase, SQLite

API & Integrations

RESTful API, Web Services, JWT & Payment Gateway

Tools & Methodologies

Git, Firebase

Work Experience

Android Developer

ARB Software India Pvt. Ltd.
Jul 2022 – Present
  • Developed & maintained Wrkplan Payroll (Java): QR attendance, geo-validation, UI/UX redesign, leave workflow.
  • Redeveloped Wrkplan Payroll in Flutter with modern architecture & improved state management.
  • Built shop billing features for real-time POS workflows.
  • Developed features for ePharma – Caplet: DCR/MCR reports, outdoor duty tracking, multi-checkpoint validation, admin circulars.
  • Built LetKnow – Caplet document management app: categorized uploads, language filters, instant view/print without downloads.

Android Developer

Gtech Web Solutions Pvt Ltd
Feb 2022 – May 2022
  • Implemented Gold Loan module in a Java banking app: loan application, tracking, workflow management.

Android Developer

Bestmarg Infotech
Feb 2021 – Feb 2022
  • Built education & e-commerce apps using Java & MVVM.
  • Developed a full educational platform: attendance, classes, exams, payments, digital books, routines.
  • Built an e-commerce app: product browsing, order placement, reorder, tracking, COD/online payments, profile management.
  • Created Barnamala: kids alphabet learning app with interactive reading & writing modules.

My Work

Wrkplan Payroll
Wrkplan Payroll (Java)

Developed and maintained the Wrkplan Payroll Android app, adding features like QR-based attendance and a full UI/UX redesign.

Wrkplan Payroll Flutter
Wrkplan Payroll (Flutter)

Redeveloped Wrkplan Payroll using Flutter for a modern, cross-platform experience with improved architecture.

Shop Billing App
Shop Billing App

Contributed to a shop billing app, focusing on real-time billing workflows and optimizing POS input flow.

ePharma – Caplet
ePharma – Caplet

Delivered features for the ePharma app, enabling medical reps to view reports, track duties, and receive admin circulars.

LetKnow – Caplet
LetKnow – Caplet

Built the LetKnow document management app, allowing admins to upload files and users to view, download, or print.

Barnamala
Barnamala

Created an interactive alphabet learning app for children with reading and writing modules.

Contact

Feel free to reach out to me.