I'm a Backend Engineer focused on building reliable and production-oriented systems with Node.js, TypeScript, PostgreSQL, MongoDB, Redis, and Docker.
I enjoy going beyond CRUD to understand and solve problems around:
- 🔐 Authentication, authorization & security
- ⚡ Concurrency & transactional integrity
- 🔁 Idempotency & reliable request handling
- 🏗️ Backend architecture & service design
- 📡 Async processing & event-driven systems
- 🚀 Production deployments & infrastructure
I also document what I learn while building these systems through technical writing and project deep-dives.
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Node.js · Express · PostgreSQL · TypeScript · Docker
A full-stack transaction application focused on concurrency, idempotency, and transactional integrity.
- ⚡ Per-user mutex locking for concurrent operations
- 🔁 Success-only idempotency for safe retries
- 🧠 Idempotency-aware mutex handling
- 🔍 Debugged and fixed a TOCTOU concurrency issue
- 🧪 Interactive labs for testing concurrency and idempotency
- 📊 Transaction management and analytics dashboard
- 🔐 Authentication through the shared Auth Service
Focus: Concurrency · Idempotency · Transactions · Reliability
Node.js · Express · PostgreSQL · JWT · OAuth 2.0 · AWS · Docker
A centralized authentication service powering multiple personal products.
Currently used by:
- Resource Hub
- Vaultex
- Personal Hub
Features include:
- 🔑 Email/password authentication
- 🌐 Google OAuth 2.0
- 🎫 RS256 JWT authentication
- 🔑 Public key endpoint for local JWT verification
- 🍪 Secure cookie-based sessions
- 🛡️ Timing attack protection
- 📡 Asynchronous email processing
- ☁️ AWS SNS → SQS → Lambda architecture
Focus: Authentication · Authorization · Security · Service Architecture
React · Node.js · Express · TypeScript · PostgreSQL · Drizzle · MinIO · Docker
A full-stack platform for storing, organizing, discovering, and sharing learning resources.
- 🔐 Shared Auth Service integration
- 📚 Public and private resources
- 🗃️ Curated collections
- 📄 Document management
- ☁️ Presigned MinIO uploads
- 📡 Webhook-driven document confirmation
- 🔁 Idempotency keys for collection mutations
- ⚙️ pg-boss background jobs
- 🧹 Scheduled cleanup of stale documents
- 🚀 Docker + GitHub Actions deployment
Focus: Full-Stack Systems · Storage Architecture · Background Jobs · API Design
Local-First · IndexedDB · TypeScript
A local-first personal tool designed around keeping user data available and useful without depending on a continuously connected backend.
- 💾 Local-first data storage
- ⚡ Fast client-side interactions
- 🔒 Data remains under the user's control
- 🧩 Designed around personal workflows and information management
Focus: Local-First Architecture · Client-Side Storage · Product Engineering
I write about backend engineering concepts and lessons from building real systems.
- 🔐 OAuth 2.0
- 🔑 Access & Refresh Tokens
- 💳 Payment Architecture
I'm actively looking for Backend Engineer / Backend Developer opportunities where I can work on challenging backend systems and contribute to real products.