Learn the building blocks, practise high-level and low-level design problems that are graded by what your design does under load, and rehearse the real thing with an AI interviewer. One canvas from the first lesson to the last mock.
A system design interview asks you to design a real product, such as a chat app, a payment ledger or a rate limiter, in about 45 to 60 minutes. You clarify requirements, estimate load, sketch the architecture, then defend trade-offs in storage, caching, consistency, failure handling and cost. It tests judgement, not memorised answers.
Start with the fundamentals: latency, throughput, replication, partitioning, caching and queues. Then practise full problems end to end, out loud, against a clock. On ArchiDepth you learn each building block, build designs on a canvas that simulates traffic and failures, and rehearse with an AI mock interviewer that scores you on evidence.
High-level design (HLD) is about services, data stores, queues and how the system scales and fails. Low-level design (LLD), often a machine coding round in India, is about classes, interfaces and design patterns inside one service. Senior loops usually include both, so ArchiDepth grades each: HLD under simulated load, LLD by its class design.
Most engineers need four to eight weeks of steady practice, depending on experience. A workable plan is one or two weeks on fundamentals, then three or more full problems a week, with a mock interview every week to find gaps. Practising aloud matters as much as reading: interviews reward explaining decisions clearly.
Seven tracks from fundamentals and building blocks to HLD, LLD, design patterns, reliability and security, and AI systems.
Drive traffic through your design, inject failures and read latency, saturation and monthly cost in real units.
Hand-written problems graded by what your design does under load, and by how your classes are built.
A timed interview with an AI interviewer, spoken or typed, and a scored report with a level estimate.
Start with the free course, build your first system on the canvas in a free practice problem, and see how it holds under load.
