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Hi, I’m Subash Luitel, a senior backend developer with 12+ years of experience building backend services, API integrations, and payment processing systems for web applications. I focus on integrating and replacing payment processors, providing consultation on payment workflows and best practices to ensure reliable transaction processing, particularly in HealthTech where secure data handling is critical. I enjoy collaborating with cross-functional teams to design secure, scalable payment solutions, from gateway integration and tokenization to fraud detection and monitoring. I’m passionate about delivering reliable performance and clear documentation to support fast onboarding and long-term maintainability.…Hi, I’m Subash Luitel, a senior backend developer with 12+ years of experience building backend services, API integrations, and payment processing systems for web applications. I focus on integrating and replacing payment processors, providing consultation on payment workflows and best practices to ensure reliable transaction processing, particularly in HealthTech where secure data handling is critical. I enjoy collaborating with cross-functional teams to design secure, scalable payment solutions, from gateway integration and tokenization to fraud detection and monitoring. I’m passionate about delivering reliable performance and clear documentation to support fast onboarding and long-term maintainability.

Subash Luitel

Back-End Developer, Full Stack Developer, Web Developer, +4

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Hi, I’m Subash Luitel, a senior backend developer with 12+ years of experience building backend services, API integrations, and payment processing systems for web applications. I focus on integrating and replacing payment processors, providing consultation on payment workflows and best practices to ensure reliable transaction processing, particularly in HealthTech where secure data handling is critical. I enjoy collaborating with cross-functional teams to design secure, scalable payment solutions, from gateway integration and tokenization to fraud detection and monitoring. I’m passionate about delivering reliable performance and clear documentation to support fast onboarding and long-term maintainability.…Hi, I’m Subash Luitel, a senior backend developer with 12+ years of experience building backend services, API integrations, and payment processing systems for web applications. I focus on integrating and replacing payment processors, providing consultation on payment workflows and best practices to ensure reliable transaction processing, particularly in HealthTech where secure data handling is critical. I enjoy collaborating with cross-functional teams to design secure, scalable payment solutions, from gateway integration and tokenization to fraud detection and monitoring. I’m passionate about delivering reliable performance and clear documentation to support fast onboarding and long-term maintainability.

Available to hire

Hi, I’m Subash Luitel, a senior backend developer with 12+ years of experience building backend services, API integrations, and payment processing systems for web applications. I focus on integrating and replacing payment processors, providing consultation on payment workflows and best practices to ensure reliable transaction processing, particularly in HealthTech where secure data handling is critical.

I enjoy collaborating with cross-functional teams to design secure, scalable payment solutions, from gateway integration and tokenization to fraud detection and monitoring. I’m passionate about delivering reliable performance and clear documentation to support fast onboarding and long-term maintainability.

Skills

Experience Level

Expert

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Language

English

Advanced

Work Experience

Backend Developer at Kyndryl

August 1, 2023 - Present

Led the integration of a new payment processor for a healthtech client, replacing a legacy system and reducing transaction failures by 30%. Designed RESTful APIs for payment processing with throughput up to 10,000 requests per minute and sub-200ms latency. Advised on gateway selection and integration strategies, and implemented a tokenization approach to protect sensitive data in PCI-DSS compliant manner. Developed a transaction reconciliation service in Python (Flask) with PostgreSQL and created a monitoring dashboard to track performance and retry behavior.

Software Engineer at Walmart

August 1, 2020 - July 1, 2023

Integrated a new payment gateway for Walmart's e-commerce platform handling over 1 million transactions daily with 99.99% uptime. Replaced an outdated processor by delivering a Java Spring Boot microservice, achieving ~25% faster checkout. Built APIs for authorization, capture, and refunds across multiple payment methods; optimized PostgreSQL queries for settlements, reducing latency by 60%. Implemented real-time fraud detection with Redis and Kafka, reducing chargebacks by 15%.

Senior Software Engineer at New Relic

May 1, 2017 - July 1, 2020

Redesigned React/TypeScript dashboards to streamline NRQL query flows; modularized Node.js Kafka handlers to improve testability; optimized NRDB SQL paths for high-cardinality reports; automated release checks and Kubernetes deployment steps with Python; traced production issues across Java services and Kafka to improve ingestion reliability; reviewed API behavior and test coverage; updated Go/Java workers for clearer retry and logging.

Software Engineer at New Relic

January 1, 2015 - April 1, 2017

Added REST API endpoints in Java and Ruby on Rails for APM configuration and account workflows; built 20+ APIs, services, UI features, and data components for application health monitoring; reduced recurring defects by ~25% through root-cause analysis and automated testing; improved selected workflow response times by 20–40% via caching, query tuning, and service fixes; supported 30+ releases.

Associate Software Engineer at New Relic

September 1, 2013 - December 1, 2014

Fixed Rails bugs in account settings pages, added validation for common user input errors; refactored MySQL queries and Rails model logic to reduce slow page loads; created JavaScript UI updates for Insights dashboards; wrote Python scripts to validate NRDB data exports and catch missing fields before downstream analysis; fixed production defects across JVM services and Linux deployments by tracing logs, request payloads, and database changes.