I write on scalability challenges in tech, infra, engineering productivity, AI and finance and sometimes trading.
Building @0xffdevs
Apr 16 • 9 tweets • 2 min read
90% of System Design interviews in 2026 are just these 7 concepts repeated again and again.
Requirements clarification
Functional requirements, non-functional requirements, scale assumptions, traffic patterns, read vs write ratio.
A lot of candidates start designing too early. Good candidates first understand what they are even building and what actually matters.
Apr 15 • 9 tweets • 2 min read
93.5% of Senior Backend Engineer interviews are just these 7 concepts repeated again and again.
API design
REST, gRPC, idempotency, pagination, versioning, retries, error handling.
They want to know if you can design APIs that survive real clients, not just return JSON that works on day one.
