KOWASHLAB

KowashLab — Backend & AI Architect

KowashLab — backend architecture, APIs, and scalable systems. Explore engineering blog posts, development projects, and technical articles about FastAPI, React, Supabase, system design, and backend engineering.

Full-stack developer specializing in Python backend systems, AI/LLM integration, and modern web applications. Expert in FastAPI, Django, React, TypeScript, and cloud infrastructure. Based in Stockholm, available worldwide.

Services: Backend & AI Logic, Frontend Development, Database & Vector Data, AI & API Integration, Cloud & DevOps, Testing & Security.

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Security Articles

Technical articles related to security.

Rate Limiting APIs Without Breaking User Experience

How to implement token bucket rate limiting with Redis, handle bursts gracefully, and communicate limits to clients — with FastAPI examples.

April 3, 2026 · 11 min read

Building Authentication in FastAPI: From Zero to Production

Production-grade authentication in FastAPI with JWT rotation, bcrypt hashing, refresh tokens, rate limiting, and security best practices.

February 19, 2026 · 12 min read

Supabase Row Level Security: Patterns That Actually Work

Practical RLS patterns for Supabase including user ownership, role-based access, shared resources, and common debugging techniques.

February 18, 2026 · 11 min read