📂 Backend Engineer
        ∟📂 API Design & REST
        ∟📂 Databases
            ∟📂 PostgreSQL / MongoDB
        ∟📂 Authentication & Authorization
        ∟📂 Background Jobs & Queues
        ∟📂 Docker & CI/CD
        ∟📂 Cloud (AWS / Azure / GCP)
        ∟📂 Caching (Redis, Memcached)
        ∟📂 Observability & Logging
        ∟📂 System Design
        ∟📂 Programming Language
            ∟ ✅ Python / Go / JavaScript