Rahul Singh Chauhan

I am a software engineer with over 9 years of experience in building scalable and high-performance web applications across industries like fintech, e-commerce, and travel. My main focus is backend development using technologies like Node.js, PHP (Laravel, CodeIgniter), and TypeScript. I have strong experience designing APIs, optimizing system performance, and managing databases such as MySQL, PostgreSQL, MongoDB, and Redis.

I have led the development of several large-scale platforms, including payment systems, e-commerce platforms, and supplier onboarding tools. I’m comfortable working with both monolithic and microservices architectures and have experience using tools like NestJS, Express.js, Angular, and React. I’ve also worked extensively with AWS services such as EC2, S3, RDS, SES, and Lambda, and have set up CI/CD pipelines using GitHub Actions and Docker.

In previous roles, I managed teams, delivered projects on time and within budget, and improved system efficiency significantly. For example, I reduced page load time by 80%, increased payment processing speed by 30%, and reduced login errors by 20%. I’ve also implemented PCI-compliant secure payment flows and worked on fraud detection and prevention systems.

Beyond technical work, I enjoy mentoring junior developers, reviewing code, and writing technical documentation. I believe in writing clean, maintainable code and building systems that are reliable, scalable, and aligned with business needs.

Currently, I am focusing on improving my skills in system design, DevOps, AWS architecture, and Kubernetes. My goal is to grow into a Principal Engineer role where I can lead engineering efforts, define technical strategies, and mentor teams to build world-class software products.

Projects That Define My Expertise

IndustryBuying E-commerce: Engineered scalable login & session modules, Redis-based caching, and real-time notifications via Firebase and SES.

PayTring Payment Orchestration: Architected plugins and transaction flows for CMS platforms, reducing fraud by 25% and increasing system reliability.

HDFC Card Reload Platform: Collaborated with PayU & HDFC to secure TCS calculations, reduce response times by 30%, and boost concurrency capacity by 20%.

Supplier Setup Portal: Led the CI/CD implementation and full-stack dev to reduce onboarding time by 30%.