Wallet Backend & NFC Integration

@mrresearcher99

Hello Sir, I have 10 years of experience working with Backend development. I can provide you APIs and backend as you need. Let's discuss this further. Thanks, Bhargav.

@technologiesit

Having 10+ years of experience as a Full Stack Developer and Digital Solutions Expert, I provide my clients with more than just technical services. I provide scalable, secure, and end-to-end solutions that align with their business goals. My skills in Flutter and PHP makes me the right fit for your wallet app backend needs. In my extensive career, I've shipped numerous applications including one that handled card tokenisation and NFC payments - a key requirement for your app at Babypay.in. These experiences have made me very comfortable with REST/GraphQL endpoints development as demanded by your project. Being an Indian based developer, I assure you a deep understanding of domestic payment schemes such as RuPay, Visa India rails, OTP flows, UPI collect for wallet top-ups, among others. With a keen attention to detail and passion for technological advancement, I'll ensure your app meets all PCI-DSS guidelines. A clean & well-documented code coupled with proper encryption at rest and in transit will be provided alongside deployment scripts, database schema and environment variables for staging and production. Also, I'll deliver the necessary PCI-DSS compliance checklist and logs for your scrutiny. Don't just choose someone who can do the job; choose someone who can help your business grow, generate results, and I guarantee to offer you long-term support on this journey. Let's transform vision into reality together!

@softwarelinkerrs

Having successfully deployed numerous wallet, banking, and payment gateway projects throughout my career, I'm confident in my ability to deliver an exceptional backend system for Babypay.in. As the founder of SoftwareLinkers, I've built a reputation for creating secure and scalable digital systems that align with clients' unique needs. My diverse skillset, including expertise in API Development, Payment Gateway Integration, and Software Architecture perfectly equip me to tackle the core scope of this project. With a firm understanding of PCI-DSS guidelines, I'll ensure every transaction moving through our system is managed reliably, logged properly, and returns clear success or failure responses - all while maintaining the highest level of security for users' data. My competency in PHP and MySQL backend development will be instrumental in crafting a robust multi-card vault that enables users to safely add, tokenise, and manage multiple cards without ever exposing critical PAN data. `

@Andyloredo

Building a reliable transaction management system with robust logging is key to a successful wallet backend. I’ve previously designed and built similar systems for fintech applications, ensuring data integrity and compliance with payment industry standards, including experience integrating with UPI for wallet top-ups. I can deliver the core backend, card vault microservice, and initial NFC integration within the 7-day timeframe, focusing initially on peer-to-peer transfers and a basic merchant payment flow. I'll prioritize clean, documented code and a PCI-DSS compliance checklist. To ensure a smooth start, could you clarify the preferred method for handling dynamic QR code generation for merchant payments?

@kuldeepsharma30

Hello, This is not a typical backend build. Payments, tokenisation, and NFC require strict compliance and correct flow orchestration or the system will fail under real transactions. I will design a PCI aligned backend using Node or Java Spring with clear separation between transaction engine, card vault, and API layer. All card data will be tokenised via PCI compliant providers such as Razorpay TokenHQ or Stripe Issuing equivalent for India, so PAN never touches your servers. For transactions, I will build idempotent flows with proper ledger handling, webhook validation, and failure recovery so every payment is traceable and consistent. UPI collect, card flows, and OTP based authentication will be handled as per Indian rails standards. NFC Tap and Pay will be integrated using tokenised cards with real time validation, aligned with supported Android HCE capabilities and bank requirements. I have worked on financial systems involving secure transaction handling and compliance driven architecture. Before moving ahead, I need clarity on: 1. Do you already have a payment aggregator onboard like Razorpay or Cashfree 2. Is NFC Tap and Pay expected only on Android or also iOS 3. Do you require full PCI certification guidance or implementation aligned with provider scope If vault and transaction logic are not architected correctly, compliance and stability both break. Regards VK

@Marcoa011

This Project caught my eye, so I had to reach out. Your need for a PCI-DSS-compliant backend with reliable transaction management and a secure multi-card vault perfectly matches my expertise. I’m confident in delivering a fully integrated, tokenised card system that supports RuPay, Visa India rails, and OTP flows, ensuring seamless NFC Tap & Pay functionality aligned with your Flutter front end. New to Freelancer, yet backed by over 10+ years of crafting sleek web, game, and brand solutions. Let’s create something exceptional together. I would love to chat more about your project! Regards, Marco Agrela

@Thiran003

Hi, I can build your secure, PCI-aligned backend for Babypay with robust transaction handling, multi-card tokenization, and NFC Tap & Pay—designed specifically for Indian payment flows. I’ve worked on payment systems with tokenization, real-time transaction processing, and API integrations, including handling OTP flows, UPI, and card-based payments. I understand the importance of reliability, latency, and compliance in wallet systems. Approach: Scalable backend (Node.js) with clean REST APIs mapped to your Flutter app Card vault via gateway tokenization (Razorpay/PayU) → no PAN storage, PCI scope minimized Transaction engine with logging, retries, and clear status responses P2P + merchant payments (QR/UPI/card flows) NFC Tap & Pay integration using supported token rails End-to-end encryption + audit logs + compliance checklist Key insight: Instead of building a raw vault, I’ll use RBI-compliant network tokenization via payment gateways, ensuring faster approval and real-world usability. Quick question: Do you already have a payment gateway account with tokenization enabled, or should I help set that up? I can also walk you through a quick architecture before we start

@Royalitservices

Hi there, You’re in the right place. I’ve successfully handled similar projects before and understand how to execute them efficiently from the start. To better define the scope, timeline, and pricing, I’d like to ask a few important questions. Due to Freelancer’s character limit, I’m unable to explain everything in detail here. Let’s connect on chat so I can share relevant past work, explain the results I’ve achieved, and provide a clear plan for your project. This will give you a better idea of my approach and how I can help. If you're ready to move forward, I’m available to discuss anytime. Looking forward to connecting. Best regards, Royal IT Service

@arshkumar213

I can develop a robust backend for Babypay with transaction handling, multi-card vault, NFC Tap & Pay, and secure APIs. Clean code, encryption, and compliance ensured. I’ll deliver full docs, deployment setup, and demo.

@indreshpnk

Hello, I understand you need a PCI-DSS-compliant backend with secure transaction processing, multi-card vault, and NFC Tap & Pay integration for your Babypay wallet. The goal is to deliver a fast, secure, and scalable payment system aligned with your existing Flutter app. Here’s what I can provide: Robust backend with REST APIs handling P2P, merchant payments, and real-time transaction logging with clear responses. Secure card vault with tokenization, BIN validation, and lifecycle management ensuring no sensitive PAN exposure. NFC Tap & Pay integration with tokenized card flow, plus support for Indian rails like UPI, OTP flows, RuPay/Visa. I bring over 4+ years of experience in backend development and payment gateway integration, with strong expertise in building secure fintech systems and scalable APIs. Just to clarify a few things: Do you have a preferred payment gateway or tokenization provider (like Razorpay, Juspay)? Should the backend be built as microservices or a single scalable architecture? Please come to the chat box to discuss more about your project. Best regards Indresh Kushwaha

@Prathore23

I can develop a secure wallet backend with NFC payment integration, including APIs, authentication, transactions, and scalable architecture. Ready to start immediately.

@d33panshus

Hi there, I see you have the Flutter frontend ready and now require the "engine" for Babypay.in. For a wallet app handling NFC Tap & Pay and card vaulting, the architecture must be non-negotiable on security. I propose a Java/Spring Boot Microservices backend to ensure the scalability and PCI-DSS compliance your project demands. My Technical Strategy: 1)Secure API & Vault: I will build a robust Java/Spring Boot API featuring a dedicated Card Vault Microservice. Using tokenization (PCI-DSS compliant), we will ensure PAN data is never exposed while enabling seamless one-tap payments. 2)India-Specific Rails: I have deep familiarity with the Indian payment ecosystem, including UPI (Intent & Collect), RuPay, and Visa/Mastercard India rails. I will integrate the necessary OTP flows and BIN checks for domestic card schemes. 3)NFC & Transaction Logic: I’ll bridge your Flutter UI with a secure NFC module that handles real-time tokenized card pulls and passes encrypted credentials to payment rails with sub-second latency. 4)Scalability: Using Spring Boot allows for high-concurrency handling of P2P and Merchant transactions, backed by a database optimized for audit logs and instant reconciliation. Why me? I don't just write code, I understand the financial reconciliation and ledger accuracy required for a wallet app. Let’s start by discussing the Database Schema and Tokenization logic, the backbone of a secure wallet. Best regards, Deepanshu Sahu