Vaultex
A personal finance app for tracking transactions and exploring how concurrency and idempotency keep money flows reliable.
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Backend Engineer
Hi, I'm Lakshay
Backend Engineer building reliable systems with Node.js & TypeScript
Authentication • Payments • APIs • Concurrency • AWS
Introduction
I’m a Backend Engineer with hands-on experience building and maintaining production systems, including payment and authentication workflows. I write technical case studies and build products and tools to solve problems I encounter in my work.
Top Projects
Resource Hub
A platform for saving, organizing, and sharing useful resources, with support for collections, bookmarks, and document uploads.
Auth Service
A shared login system that gives users one secure way to access multiple products without creating separate accounts each time.
IdeaHub
A personal idea management tool for quickly capturing thoughts, organizing them into projects, and revisiting them later with context intact.
Experience
Backend Engineer
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 Engineering
Node.jsTypeScriptExpress.jsREST APIsPostgreSQLMongoDBJWTOAuth 2.0WebhooksIdempotencyConcurrency Control
Cloud & Distributed Systems
AWS LambdaSNSSQSCloudWatchIAMBackground JobsObject StoragePresigned URLs
DevOps & Deployment
DockerGitHub ActionsLinuxCI/CD
Development & AI
GitPostmanESLintGenerative AI
Latest Articles
Technical writing on backend engineering, system design, security, and lessons learned from building real systems.
OAuthGoogle
How Google OAuth Works: Understanding Login with Google
Discover how Google OAuth authentication works behind the scenes. Learn about authorization codes, access tokens, refresh tokens, and the complete OAuth 2.0 flow.
3 min read
PaymentsArchitecture
Payment Architecture Evolution: From Client-Side Risks to Reliable Webhooks
How payment gateway architecture evolves from insecure client-side flows to server-side order creation, webhooks, and reconciliation — and how we applied it at Internware.
4 min read
AuthenticationJWT
Access and Refresh Tokens: A Practical Guide
Learn why single long-lived tokens create UX and security problems, how access and refresh tokens solve them, and the key implementation decisions you need to make.
3 min read
Let's Build Something Reliable
I'm open to Backend Engineer opportunities where I can work on authentication, payments, distributed systems, or backend infrastructure. Reach out via email or connect on social platforms.
dev@lakshaymahajan.com