Our founder worked as a Software Development Engineer for Plem, focusing on authentication systems and the reward point feature. Plem is a digital platform that allows users to purchase gift cards from over 250+ brands, earning 1% cashback in the form of 'PLEMs' on every UPI transaction, simplifying the gift card experience.
Consumers often miss out on rewards and face complexities in managing multiple brand gift cards.
Our team developed a user-friendly mobile application that integrates seamless gift card transactions with a rewarding cashback system, encouraging users to maximize their savings.
Authentication system development
Reward point feature implementation
Gift card purchasing system
Cashback functionality
UPI transaction integration
Multi-brand support (250+ brands)
Digital gift card management
Implementing a secure authentication system that protected user data while maintaining a streamlined login experience.
Developing an accurate and scalable system for calculating, tracking, and managing reward points across multiple transaction types.
Creating a unified system to handle gift card purchases and redemptions across 250+ brands with varying APIs and requirements.
Ensuring instant and reliable processing of UPI transactions and immediate reward point crediting without delays.
Implemented a multi-layered authentication system with token-based security, biometric options, and fraud detection mechanisms.
Designed a sophisticated reward calculation engine that could handle complex business rules, promotional offers, and point expiration policies.
Created a standardized integration layer that normalized interactions with diverse brand APIs through a unified protocol.
Implemented efficient UPI transaction handling with robust error recovery and reconciliation mechanisms.
Developed a database architecture optimized for high transaction volumes and quick reward point calculations and redemptions.
Plem is a mobile marketplace where users buy gift cards from 250+ brands, pay via UPI and earn 1% back as PLEM reward points. A Java Spring Boot backend on AWS exposes secure authentication, a rewards ledger and a brand integration layer over MySQL. A modular monolith fit a five-person team while keeping money movement and point accounting in one consistent transaction boundary.
Native mobile apps for Android and iOS are the only customer surface, with an internal console for operations.
A REST API behind a load balancer authenticates every call and shields the backend from abuse.
Spring Boot modules own identity, catalog, orders, the rewards ledger and brand fulfilment within one deployable.
MySQL holds users, orders and a double-entry style points ledger; a cache serves the brand catalog.
Payments and gift card issuance come from external providers normalised behind adapters.
Managed AWS services keep operations light for a small team.
User signs in with phone OTP or biometrics and receives a short-lived access token with refresh rotation.
User picks a brand gift card and denomination; pricing applies any PLEM points redeemed as a discount.
The app initiates a UPI payment through the payment gateway and the backend records a pending order.
The gateway callback confirms payment; the backend verifies the signature and marks the order paid in one transaction.
The brand adapter requests issuance of the gift card and stores the voucher securely for the user.
The rewards engine credits 1% PLEM points to the ledger and the user is notified; reconciliation runs against gateway settlement files.
With five engineers, one deployable with clear module boundaries kept payments, orders and points in a single transaction scope and avoided distributed-consistency bugs.
Points behave like money, so every credit, redemption and expiry is an immutable ledger entry rather than a mutable balance, making audits and promotional rules tractable.
Brands expose different issuance APIs and rules; a normalised adapter interface let new brands be onboarded without touching order or payment logic.
UPI callbacks can arrive late or twice; idempotency keys plus scheduled reconciliation against settlement data prevent double credits and lost orders.
“The intuitive UX design and seamless integration of the gift card marketplace has been instrumental in our rapid user growth and high app store ratings.”
We ship MVPs, AI agents, and production systems in 8 weeks. Bring the rough spec — we'll scope the build inside a week with a fixed timeline and quote.
