ETL Interview Questions: 50 Questions and Answers for Data Engineers
Prepare for ETL interviews with 50 practical ETL Interview Questions covering SQL, testing, CDC, incremental loads, data quality, pipeline reliability, and data pipeline design.
A Gadallh
Ahmed Gadallah is the Founder and Editor of Vertex Frontier, where he publishes research-driven articles on AI, data science, cloud computing, cybersecurity, software engineering, and emerging technologies, with a focus on technical accuracy, clarity, and practical insights.
TPM vs HSM vs Secure Enclave vs KMS: Where Your Encryption Keys Should Live
Compare TPM vs HSM vs secure enclave vs KMS. Includes real breach data, 2026 FIPS changes, a key rotation calculator, and an interactive decision tool.
Sandboxing AI Coding Agents: Comparing Docker, Firecracker & eBPF Isolation in Production
Choosing the right sandboxing AI coding agents: Compare Docker, Firecracker, and eBPF isolation across shared-kernel risks, egress, secrets, and task cost.
Distributed Inference: The Complete Guide to Serving Giant AI Models
Why 1 GPU can't serve frontier AI and how distributed inference fixes it. Covers tensor, pipeline, MoE, KV cache math, with 4 interactive calculators.
Why Pandas is So Slow? 4 Performance Fixes, From Code to GPU
Wondering why Pandas is so slow? The library isn't the problem. Profile first, then apply 4 fixes: code, dtypes, engines, and GPU. Benchmarks included.
Handling CDC Duplicates in ClickHouse: ReplacingMergeTree vs. FINAL vs. ArgMax
Does FINAL really kill performance? Compare ReplacingMergeTree, FINAL, and argMax for ClickHouse CDC duplicates with real benchmarks and our match-fraction calculator.
OpenFGA vs SpiceDB vs Google Zanzibar: Implementing ReBAC for Enterprise RAG
Compare OpenFGA vs SpiceDB vs Google Zanzibar for enterprise RAG. Explore ReBAC modeling, permission-aware retrieval, consistency, and sync patterns.
AI Agent Engineering: The 20 Concepts That Separate Senior Engineers From Demo Builders
A senior-engineer guide to AI agent engineering: 20 concepts in 5 layers, from agent loops to evals, with real failure cases, code patterns and a roadmap.
Vector Database Security: Hardening Pinecone, Qdrant, Weaviate, and pgvector
Learn vector database security with practical controls for Pinecone, Qdrant, Weaviate, and pgvector, covering identity, tenant isolation, TLS, RLS, logging, backups, and RAG authorization.
Proxmox Storage Types Explained: ZFS, Ceph, LVM and NFS
Proxmox storage compared: directory, LVM-thin, ZFS, replication, NFS, iSCSI and Ceph, with requirements, mistakes and a decision guide for 1, 2 or 3+ nodes.
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