Personal Tool · Active · Solo ProjectActive Project
Vaultex
Full-stack transaction app with idempotency-aware mutex locking, TOCTOU concurrency debugging, interactive labs, and Auth Service integration.
Node.jsExpressPostgreSQL
6 min read
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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
Hi, I'm Lakshay — a Backend Engineer who learns by building real systems, breaking them, and fixing them properly.
I work primarily with Node.js and TypeScript, building backend systems around authentication, payments, APIs, concurrency, and asynchronous workflows. My projects focus on understanding the engineering problems behind a system — from race conditions and idempotency and database architecture.
I also write technical case studies and build personal tools to explore ideas in practice. Currently, I'm deepening my understanding of Generative AI and how it can be applied to the systems I build.
What I Work On
- Authentication & SecurityOAuth, JWTs, secure sessions, and reusable authentication infrastructure.
- Reliable TransactionsPayments, idempotency, concurrency control, and race-condition handling.
- Asynchronous SystemsEvent-driven workflows, background jobs, retries, and failure recovery.
- Backend ArchitectureAPI design, database architecture, object storage, and system evolution.
My approach: understand the root cause, design before implementing, question tradeoffs, and document what I learn.
Top Projects
Engineering case studies — technical decisions, tradeoffs, mistakes, and debugging stories.
Personal Tool · Active · Solo ProjectActive Project
Resource Hub
Centralized resource platform with presigned MinIO uploads, webhook-driven documents, PostgreSQL + Drizzle, collections, and Auth Service integration.
Node.jsExpressTypeScript
7 min read
Personal Tool · Active · Solo ProjectActive Project
Auth Service
Built a centralized authentication service powering IdeaHub, Resource Hub, and Vaultex — RS256 JWT, Google OAuth, secure cookies, and event-driven email delivery via AWS.
ExpressPostgreSQLAWS SNS
3 min read
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 read
Experience
Where I've applied backend engineering to real production systems.
Backend Engineer
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 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.
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
Applied AIAI Engineering
My Evolution Towards Becoming an Applied AI Engineer
Reflections from building my first AI application and learning what it really takes to ship production-ready AI — guardrails, human-in-the-loop, context management, and the difference between SDKs and Agent SDKs.
3 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