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Harmeet Singh

@harmeetsingh10

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Software Specialist at Fiserv India building PCI DSS-compliant payment processing and ISO 8583 flows.

India

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At Fiserv India Pvt. Ltd., I build payment-processing systems, including ISO 8583 messaging flows for card authorization, clearing, and settlement. I also work on transaction workflows for VISA, MasterCard, American Express, and Discover.

I implemented OAuth 2.0 authentication, MFA, and PCI DSS–compliant encryption for payment platforms. I also developed Store-and-Forward processing and WIC and EBT payment flows.

Previously, I was Team Lead at TietoEVRY (EVRY India Pvt. Ltd.), leading development teams through the full SDLC. Across earlier roles, I developed .NET applications, microservices, and enterprise software, and contributed to React.js frontend enhancements.

Experience

Work history, roles, and key accomplishments

Current

Software Specialist

Current

Fiserv India Pvt. Ltd.

Dec 2023 - Present (2 years 10 months)

Architected OAuth 2.0 authentication, MFA, and PCI DSS-compliant encryption frameworks for payment platforms. Implemented ISO 8583 messaging flows and WIC/EBT payment processing for major card networks.

OAuth MFA PCI DSS ISO 8583 WIC Programs EBT Store And Forward Architecture Pre Authorization Capture Refunds Reversal Visa Mastercard AmEx Discovery Bin Management Azure .NET Core C#SQL Server Stored Procedures

Team Lead

TietoEVRY (EVRY India Pvt. Ltd.)

Dec 2021 - Dec 2023 (2 years)

Led onshore and offshore development teams through full SDLC, from requirement analysis to post-production support. Drove effort estimation, technical design reviews, and code quality standards.

SDLC Sprint Planning Effort Estimation Technical Design Code Review Mentorship API Design Unit Testing CI CD Stakeholder Management

Senior Software Engineer

AIE Software India Pvt. Ltd.

Sep 2020 - Nov 2021 (1 year 2 months)

Developed microservices-based applications using .NET Core and RESTful Web APIs, improving system modularity and scalability. Implemented Sitecore Helix architecture and contributed to React.js frontend enhancements.

.NET Core REST APIs Microservices Sitecore Helix SXA React Performance Optimization

Software Engineer

Beesolver Technology

Jul 2019 - Aug 2020 (1 year 1 month)

Developed CRM and enterprise platforms using .NET Core, Angular, Sitecore, and Entity Framework Core. Implemented dependency injection patterns, bulk data optimizations, and unit test coverage.

.NET Core Angular Sitecore Entity Framework Core Dependency Injection Unit Testing

Software Engineer

Cogniter Technology

Jul 2018 - Jul 2019 (1 year)

Delivered enterprise and public-sector applications for US clients, including notification systems, escalation engines, OCR, and surveillance integrations.

Notification Systems Escalation Engineering OCR Surveillance Integrations

Junior Developer

Softdata Infotech (ZUPE Technology)

Oct 2015 - Jul 2018 (2 years 9 months)

Developed PCI DSS-compliant payment gateway solutions for clients in New Zealand and Australia. Built secure, custom payment collection forms for NGOs including UNICEF and Make-A-Wish Foundation.

PCI DSS Payment Gateways Payment Forms