A comprehensive open-source reference for backend engineering — HTTP, concurrency, gRPC, distributed systems, observability, and cloud-native deployment. Built from first principles.
Backend Engineering, Low-Level Design, System Design, Networking, Security, SQL, and Distributed Systems explained through visual diagrams.
Milind's notes taken from the Backend in Node.js from Scratch Course by Sanket Singh
Learn backend engineering through real production failure cases.
A handbook for Backend Engineering
Production-grade cryptocurrency trading engine simulator with event-driven architecture, atomic balance updates, and thread-safe order matching. Built with Spring Boot 3.3+, Kafka, PostgreSQL, and Docker. Perfect for showcasing backend engineering skills!
Autonomous infrastructure recovery engine featuring predictive anomaly detection and self-healing capabilities for critical backend systems.
Experimental Subset Sum solver for large integers using SQLite as an out-of-core storage engine.
Enterprise-grade Event-Driven Webhook Service built with NestJS. Architected for high-reliability processing of mission-critical data from Stripe, PayPal, and GitHub. Features include HMAC security, idempotency control, BullMQ-based asynchronous processing with DLQ patterns, and distributed tracing with OpenTelemetry.
Official Portfolio & Engineering Blog of Md Shajib Sikder — Senior Backend Systems Engineer & Architecture Specialist at Weekmotion. Specializing in high-concurrency REST APIs, MySQL query optimization, distributed Redis caching, and scalable Laravel queue architectures.
High-Reliability Code Execution Engine - Monorepo with Standalone HTML IDE, Node.js/Fastify Backend on Render, E2E Tests & CI/CD.
A high-performance Zero-Trust security proxy designed for data privacy and compliance. Implements dynamic data masking (DDM), AES-256 encryption, and automated PII detection to secure sensitive data flows in enterprise environments. Engineered for HIPAA/GDPR alignment.
A lightweight Java 17 HTTP micro-framework with explicit routing, middleware composition, and production-focused runtime controls.
Docs for BootArc. (under development)
System Design in Bengali
Fault-tolerant log ingestion and query service built in Go with async processing, batching, SQLite persistence, retries, and Prometheus observability.
Production-oriented Go API gateway with Redis rate limiting, circuit-breaker resilience, reverse proxying, health checks, and Prometheus observability.
An open-source Agent Skill teaching AI coding agents evidence-based backend performance review — technology-agnostic, workload-driven, invents nothing.
A Production-grade Rental Management System for handling properties, tenants, leases, rent payments, and maintenance workflows.
Backend engineer building reliable, scalable distributed systems and cloud-native infrastructure with Go.
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