Personal Tool · Active · Solo ProjectActive Project
IdeaHub
Centralized platform for capturing product ideas and thoughts, with soft delete and Auth Service integration.
Next.jsDrizzle ORMPostgreSQL
3 min readRead case study →
Backend Engineer
Hi, I'm Lakshay
Building APIs, authentication systems, and payment workflows with Node.js & AWS
Introduction
Hi, I'm Lakshay — a Backend Engineer focused on building reliable systems.
I specialize in authentication architecture, payment integration, and event-driven services using Node.js, Express, MongoDB, and AWS.
What I Work On
- Payment security and transaction processing
- Authentication system reliability
- Asynchronous workflow design
- Database architecture and optimization
My approach: understand the root cause, design clear architecture, implement with proper observability.
Top Projects
Engineering case studies — technical decisions, tradeoffs, and debugging stories.
Personal Tool · Active · Solo ProjectActive Project
Auth Service
Centralized authentication service with asymmetric JWT, local token verification, and async email delivery via AWS.
ExpressMongoDBAWS SNS
3 min readRead case study →
Internship Project · Production · Team ProjectProduction System
Leadership Talk Season 3
Event registration platform for a 2-day leadership event with 4 speaker sessions and 500+ combined registrations.
ExpressMongoDBCashfree
3 min readRead case study →
Technical Assessment · Completed · Solo ProjectTechnical Assessment
FinTech Core API
Transaction APIs with mutex locking, idempotency protection, and auditability — built as a backend engineering assessment.
Node.jsExpressPostgreSQL
2 min readRead case study →
Experience
Where I've applied backend engineering in production.
Backend Engineer · Present
InternWare
Backend systems powering event registration platforms, authentication, payment workflows, and administrative tooling for real users.
At InternWare, I worked on authentication, payment workflows, coupon management, and admin tooling for production event-registration systems handling real users and transactions.
Read full experience →Skills & Technologies
Backend Development
Node.jsExpress.jsMongoDBREST APIsJWTOAuth 2.0WebhooksCashfree
Cloud & AWS
LambdaSQSSNSCloudWatchIAM
DevOps & Deployment
DockerGitHub ActionsLinux
Development Tools
GitPostmanESLint
Latest Articles
Technical insights on web security, authentication, and modern software engineering
LLMAI
How LLMs Work: A High-Level Overview
Understand how Large Language Models like GPT, Claude, and Gemini work under the hood. Learn about tokenization, vector embeddings, positional encoding, transformers, and next-token prediction.
4 min read
Machine LearningApplied AI
From Wheat to Chatbots: Understanding ML Engineers vs Applied AI Engineers
Learn the difference between ML engineers and Applied AI engineers using a simple wheat-to-bread analogy. Discover how LLM APIs power modern AI applications without building models from scratch.
2 min read
UPIPayments
How UPI Works: Understanding India's Real-Time Payment System
Learn how UPI (Unified Payments Interface) enables instant payments in India. Understand the complete payment flow, security features, and NPCI's role in digital transactions.
5 min read
Contact
Open to Backend Engineer opportunities in authentication infrastructure, payment systems, or distributed services. Reach out via email or connect on social platforms.
dev@lakshaymahajan.com