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PARIS · 2025
Fintech QA & Payment Systems Specialist


5+ years building payment infrastructure that powers real transactions. Now at SKEMA Paris, bridging technical depth with AI-driven risk innovation.

QA
01 · ABOUT

I validate systems that move money. Not test cases. Payment infrastructure. $1B+ monthly GPV. 1M+ merchants across Asia, Middle East and Africa. Zero critical defects at go-live.

I led a cross-functional team of 7 to deliver an AI/ML fraud detection system from scratch: rule engine, ML model inference, and geography-based blocking. Signed off by VP and CTO.

Now at SKEMA Paris, I am completing an MSc in Sustainable Finance and Fintech, writing a dissertation on Explainable AI-Driven Adaptive Fraud Detection. Not a career change. An altitude upgrade.

"Technical depth. Strategic ambition. Paris-ready."
0
YRS Professional Experience
0
Monthly GPV Validated
0
Merchants Served
0
Critical Defects at Go-Live
Tamil (Native) English (Bilingual) French (Elementary)
02 · SKILL ARCHITECTURE

PAYMENT DOMAIN

  • UPI · POS · AEPS · MATM · Payment Gateway
  • Settlement & Reconciliation (ISO20022 XML)
  • Fraud Detection & Risk Systems
  • Dispute Management (Mastercard / Visa)
  • Merchant & Terminal Lifecycle Management
  • Chargeback & Back-Office Systems

ENGINEERING STACK

  • Selenium · REST Assured · JMeter · Postman
  • Java · Python · SQL
  • Grafana · InfluxDB · Power BI
  • CI/CD Pipeline Integration
  • Cucumber / TestNG · Page Object Model
  • Appium · VBS Automation

EMERGING EXPERTISE

  • Explainable AI & ML Financial Modelling
  • ESG Integration & EU Taxonomy
  • Green Bonds & Sustainable Investment
  • Blockchain & Crypto Assets
  • LSEG Database & Extra-Financial Analysis
  • Python for Finance & Econometrics
03 · SELECTED WORK

01
CREDOPAY TECHNOLOGY SERVICE LTD

AI/ML Fraud Risk Management System

Zero critical defects. Signed off by VP & CTO.

Built and validated a real-time fraud detection system screening high-volume transactions across UPI, POS, AEPS, and Payment Gateway channels, with accuracy, speed, and full regulatory compliance.

  • Led cross-functional team of 7 (3 Data Engineers, 1 BA, 3 Interns)
  • Validated rule engine: velocity checks, MCC restrictions, real-time decisions
  • ML model inference API: accuracy, latency, consistency validation
  • Geography-based blocking: country/region/IP level, central bank mandated
  • Fraud dashboards: detection rate, false-positive rate, model confidence
  • System went live with zero critical defects
AI/ML Fraud Detection Rule Engine Python Grafana Cross-functional Leadership
02
CREDOPAY TECHNOLOGY SERVICE LTD

Merchant & Network Settlement System

99.9% financial accuracy. $1B+ monthly volume. Zero discrepancies at go-live.

Validated a multi-model settlement engine processing $1B+ monthly GPV across 1M+ merchants in Asia, the Middle East, and Africa.

  • Settlement models: IRF+, IRF++, Wallet, Blended
  • ISO20022 XML, Mastercard, Visa & NPCI file processing validated
  • T+1, T+2, weekly, monthly settlement cycle configurations
  • 99.9% financial accuracy across multi-million-dollar daily runs
  • Zero settlement discrepancies at go-live
  • NEFT/ACH file generation, encryption, SFTP transmission
Settlement ISO20022 Mastercard Visa NPCI Reconciliation $1B+ GPV

"10 systems built, validated, and shipped to production."

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03

Merchant Management System

End-to-end merchant onboarding & KYC — 500+ test scenarios, zero bugs at go-live.

Merchant Onboarding KYC API Testing
03 Credopay Technology Service Ltd

Merchant Management System

Delivered to live with zero bugs. Version 2.0 to 3.0 migration completed.

Designed and validated the complete merchant onboarding flow covering merchant details, terminal details, and KYC verification across UI, API, and bulk import paths.
  • Upstream/downstream integration flow across MMS, SWITCH, Scheme, Bank, Settlement
  • KYC document upload, verification, approval, re-KYC, and rejection workflows
  • 3 onboarding types: UI, API, Bulk Import — all paths covered
  • 500+ test scenarios covering all onboarding paths, edge cases, negative flows
  • Zero bugs at go-live. Version 2.0 to 3.0 migration delivered.
Merchant Onboarding KYC API Testing Integration 500+ Test Cases
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04

Wallet Management System

Full wallet lifecycle. 1M+ merchants, 1000+ test cases, zero production issues.

Wallet Ledger Charge Engine
04 Credopay Technology Service Ltd

Wallet Management System

1000+ test cases. Full lifecycle delivered to live with complete system stability.

Defined and validated end-to-end wallet lifecycle: Ledger Creation → Transaction Entries → Charges Calculation → Wallet Settlement across 1M+ merchants.
  • Master Wallet, Tax Wallet, Merchant Wallet — creation, linkage, balance isolation
  • Charge slab hierarchy: tiered rates, flat fees, percentage-based models
  • GST and service tax calculation validated on top of transaction charges
  • Withdrawal, Recharge/Load, and settlement cycle flows
  • 1000+ test cases · full system stability at go-live
Wallet Ledger Charge Engine Settlement 1M+ Merchants
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05

Terminal Management System

Terminal lifecycle with geo-tracking and auto-deactivation. Zero reconciliation gaps.

Terminal Management Geo-Tracking Auto-Deactivation
05 Credopay Technology Service Ltd

Terminal Management System

Auto-deactivation engine. Geo-tracking. Zero reconciliation gaps.

Designed and validated end-to-end terminal lifecycle management covering onboarding, activation, deactivation, geo-tracking, and auto-deactivation features.
  • Full status lifecycle: Pending → Approved → Active → Deactivated → Suspended
  • Auto-deactivation for terminals inactive 3+ consecutive months
  • Geo-coordinate (lat/long) capture via UI, API, and Bulk Import
  • Terminal count reconciliation across MMS, SWITCH, and Settlement systems
  • Edge cases: pending transactions, disputed terminals, inactivity window
Terminal Management Geo-Tracking Auto-Deactivation Reconciliation
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06

Transaction Microservice

Multi-channel payment testing across UPI, POS, AEPS, MATM, and PG with full load and stress validation.

UPI POS AEPS
06 Credopay Technology Service Ltd

Transaction Microservice

Every channel. Every state. Full load and stress validation.

Designed and executed end-to-end transaction testing across all payment channels and device types — Device → Transaction System → Socket → SWITCH → Scheme → Callback.
  • AEPS: biometric auth, Aadhaar resolution, Cash Withdrawal, Balance Enquiry
  • POS: EMV chip, magnetic stripe, NFC contactless, partial approval, void
  • UPI: Collect, Push, Dynamic QR, mandate creation/execution/revocation
  • Payment Gateway: tokenization, 3DS, OTP, webhook, refund initiation
  • JMeter load suites · Grafana + InfluxDB monitoring · P90/P95/P99 validated
UPI POS AEPS Payment Gateway JMeter Performance Testing
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07

Dispute Management & Chargeback System

Full chargeback lifecycle across Mastercard 48xx and Visa dispute codes, from initiation through to arbitration and resolution.

Chargeback Mastercard Visa
07 Credopay Technology Service Ltd

Dispute Management & Chargeback System

End-to-end chargeback lifecycle. Mastercard + Visa. Arbitration to resolution.

Designed and validated complete chargeback lifecycle from initial dispute intake through final resolution across Mastercard and Visa schemes.
  • Full flow: Retrieval → First Chargeback → Representment → Pre-Arbitration → Arbitration
  • Mastercard 48xx series + Visa dispute condition codes — all categories covered
  • TC40 / SAFE fraud reporting flows validated
  • Partial refund, full refund, and refund reversal lifecycle
  • Dispute microservice architecture designed with VP
Chargeback Mastercard Visa Dispute Management TC40 SAFE
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08

Application Migration

PHP to Node.js, version 2 to 3, and database migration. Zero data loss, 99.9% uptime maintained throughout.

Migration PHP → Node.js Database
08 Credopay Technology Service Ltd

Application Migration

Zero data loss. 99.9% platform availability maintained. All migrations delivered.

Led and executed multiple large-scale system migrations across technology stack, database, and infrastructure layers with zero data loss and minimal downtime.
  • UPI migration PHP → Node.js: functional parity, API contract consistency
  • Database migration: row-count reconciliation, checksum validation, referential integrity
  • Application v2.0 → v3.0: 1,200+ automated regression scenarios
  • Server migration: latency benchmarks, throughput thresholds, Grafana monitoring
  • 99.9% platform availability maintained throughout all cutover windows
Migration PHP → Node.js Database Regression 1200+ Scenarios
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09

ERP & UPI Automation (Milk Nest)

Selenium and Java framework delivering a 40% regression efficiency gain across ERP and UPI systems.

Selenium Java REST Assured
09 Milk Nest Technology Service Ltd

ERP & UPI Automation (Milk Nest)

40% efficiency gain. 200+ requirements converted to structured test scenarios.

Engineered a Selenium and Java automation framework for ERP solutions and UPI-based payment systems in the dairy and agricultural sector.
  • Regression execution reduced from 8 to 5 hours per sprint (40% gain)
  • REST Assured + Postman API suites for Android and web payment applications
  • 200+ functional requirements converted to structured test scenarios
  • Data-driven testing approach for scalability across release cycles
  • Traceability matrices maintained for complete test coverage per release
Selenium Java REST Assured ERP UPI 40% Efficiency Gain
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10

Test Automation & Quality Assurance

1,200+ automated scenarios with 35% regression time reduction and full CI/CD pipeline integration.

Selenium REST Assured JMeter
10 Credopay Technology Service Ltd

Test Automation & Quality Assurance

1,200+ scenarios. 35% faster regression. Zero manual bottlenecks.

Built and maintained a comprehensive test automation ecosystem covering UI, API, integration, and performance testing across all payment platform modules at Credopay.
  • Selenium + Java/Python framework — Page Object Model, 1,200+ regression scenarios
  • Reduced manual regression execution time by 35% through automated suite runs
  • REST Assured + Postman API suites — positive, negative, boundary, edge cases
  • JMeter performance suites — load, stress, spike, soak testing
  • Grafana + InfluxDB real-time monitoring — P90, P95, P99 latency percentiles
  • CI/CD pipeline integration — smoke, sanity, regression triggers per build stage
  • 50+ high-severity defects triaged in Jira with root cause analysis reports
  • VBS automation scripts for batch processing and back-office workflow automation
  • Cross-browser validation: Chrome, Firefox, Edge
Selenium REST Assured JMeter CI/CD 1200+ Scenarios 35% Efficiency Gain
04 · HOW I WORK

01

DISCOVERY

Requirements, system flows, risk areas

02

PLANNING

Test strategy, scenario design, traceability matrix

03

EXECUTION

Manual testing, API validation, automation build

04

OPTIMIZATION

Regression tuning, pipeline integration, coverage refinement

05

MONITORING

Performance metrics, defect triage, root cause analysis

06

SIGN-OFF

Deployment validation, post-release sanity, stability confirmation

05 · CREDENTIALS

SKEMA Business School

Paris, France · 2025–2026
MSc Sustainable Finance & Fintech
DISSERTATION

"Explainable AI-Driven Adaptive Fraud Detection: A Machine Learning System for Digital Banking"

Completing MSc at SKEMA Paris. Finalising dissertation on Explainable AI fraud detection. Targeting fintech product and payment systems roles across Europe, building on 5+ years of technical depth in payment infrastructure and AI-driven risk.

ESG Fintech AI/ML Blockchain Python LSEG EU Taxonomy

St. Mother Theresa Engineering College

Bachelor of Engineering — Mechanical · India · 2016–2020

Engineering foundation → analytical thinking → QA in fintech

CESGA ESG Analyst
Result Pending
ISTQB Foundation Level
In Progress
Data Processing Specialist
Certified
  • President — Mechanical Association of Sustainable Society St. Mother Theresa Engineering College, 2018–2020
  • Vice President — Entrepreneurship Development Cell St. Mother Theresa Engineering College, 2018–2020
  • Secretary — Mathematics Club St. Mother Theresa Engineering College, 2018–2020
07 · THINKING OUT LOUD

Sharing perspectives on fintech, payment systems, and AI-driven risk. Follow along on LinkedIn.

Real-time fraud detection is not just a technical problem. It is a trust problem. Validating ISO 20022 messaging formats and financial settlement rails requires rigorous end-to-end reconciliation testing to prevent multi-million dollar ledger discrepancies before deployment.

#Fintech #Payments #ISO20022
Read on LinkedIn →

Machine learning models in fraud detection are powerful, but black-box decisions face strict European regulatory hurdles. Explainable AI (XAI) bridges the gap between high accuracy models and compliance auditability in digital banking.

#AI #FraudDetection #Fintech
Read on LinkedIn →

From validating $1B+ payment infrastructure in India to studying Sustainable Finance and Fintech at SKEMA Paris. The transition was not a pivot. It was a vertical move.

#QualityAssurance #Fintech #TechLeadership
Read on LinkedIn →
Follow on LinkedIn →
08 · LET'S CONNECT

Fintech Product. Payment Systems. AI-Driven Risk. Europe.

SKEMA Business School · Paris, France