System Design Interview Expectations by Company and Level: What Google, Amazon, Meta, and Apple Actually Evaluate

What Google, Amazon, Meta, Apple, and Netflix actually evaluate at L4, L5, L6, and Staff. The rubric, the anti-patterns, and how to prepare for your specific combination.

What This Guide Covers

• How Google, Amazon, Meta, Apple, and Netflix system design interviews differ from each other

• What interviewers evaluate at each level: L3/L4, L5, L6, and Staff

• The scoring rubric with percentage weights for each dimension

• The specific anti-patterns that get you downleveled at each company

• Company-specific question banks with the concepts each question tests

• How to tailor your preparation for a specific company and level combination

---

There is a myth in system design interview prep that the interview is the same everywhere. It is not.

A system design interview at Google feels fundamentally different from one at Amazon, which feels fundamentally different from one at Meta.

The questions may look similar on paper.

“Design a URL shortener” could appear at any of them.

But what the interviewer evaluates, how deep they expect you to go, and what a “strong hire” answer looks like is shaped by the company’s engineering culture, interview rubric, and the specific role you are interviewing for.

The same is true for levels.

An L4 candidate and an L6 candidate could receive the same question, but the bar for “meets expectations” is completely different.

An L4 candidate who produces a clean high-level architecture with reasonable choices earns a strong score.

An L6 candidate who produces that same answer is downleveled, because at L6, the interviewer expects proactive discussion of failure modes, operational concerns, cost reasoning, and multi-region architecture without being asked.

This guide covers both dimensions.

For each company, you will learn what makes their interview distinct and how to adapt your preparation.

For each level, you will learn the specific expectations that separate a passing answer from a failing one. By the end, you will know exactly how to prepare for your specific company-and-level combination.

---

Part 1: The Level Ladder (What Changes from L3 to Staff)

Before diving into company-specific differences, you need to understand the universal level expectations. These apply across Google, Amazon, Meta, and most big tech companies.

The terminology differs (Google uses L3-L7, Amazon uses L4-L7, Meta uses E3-E7), but the expectations at each tier are remarkably consistent.

L3/L4: Show That You Understand the Building Blocks

At the junior and mid-level tier, the interviewer is evaluating whether you understand the basic components of a system and can assemble them into a reasonable architecture.

What earns a “strong hire” at L3/L4: You ask clarifying questions before drawing. You produce a clear high-level architecture with the right components: load balancer, application servers, database, and cache. You make reasonable choices and can explain them at a surface level.

“I chose PostgreSQL because we need relational data with joins.”

You can estimate basic capacity.

“With 10 million users uploading 2 photos per day at 2 MB each, we need 20 TB of new storage per day.”

What gets you rejected at L3/L4: You cannot explain why you included a component. You draw a box labeled “cache” but cannot explain what you are caching or why. You skip requirements gathering and start drawing immediately. You use buzzwords incorrectly (”we need blockchain for consistency”).

The bar in numbers: Spend 5 minutes on requirements, 15 minutes on the high-level design, 15 minutes on a shallow deep dive into 1-2 components, and 10 minutes on basic trade-offs.

You are not expected to discuss multi-region architecture, deployment strategies, or monitoring.

For a detailed breakdown of what the L3/L4 bar looks like versus L5/L6, including side-by-side answer comparisons, that guide covers the gap.

L5: Show That You Can Reason About Trade-Offs

At the senior level, knowing the building blocks is table stakes.

The interviewer evaluates whether you can reason about why you made each choice and what the alternatives were.

What earns a “strong hire” at L5: You proactively identify the hardest part of the system. “The interesting challenge here is the feed generation. Let me walk through the trade-offs between fan-out on write and fan-out on read.”

You go deep on 2-3 components without being asked.

You discuss failure modes: “If the primary database goes down, our read replicas can be promoted, but we lose the last few seconds of writes if we are using asynchronous replication.”

You name specific technologies and explain why: “I chose Cassandra over DynamoDB because our write pattern is append-heavy and we need tunable consistency per query.”

What gets you rejected at L5: You produce a correct architecture but cannot explain the reasoning.

You say “I would use Redis for caching” without discussing what you are caching, your eviction policy, or your invalidation strategy.

You handle the happy path but freeze when the interviewer asks about failures.

You avoid committing to decisions. “It depends” is fine once.

By the third time, the interviewer marks you as unable to make engineering decisions under uncertainty.

The bar in numbers: Spend 3 minutes on requirements, 10 minutes on the high-level design, 25 minutes on deep dives into 2-3 components, and 7 minutes on trade-offs and failure modes. The deep dive is what separates L5 from L4.

How interviewers evaluate trade-offs at the senior level covers the specific rubric dimension that carries 20% of the score.

L6: Show That You Think Like an Owner

At the staff-equivalent level, the interviewer evaluates whether you can own a system end-to-end. This means thinking about not just the architecture but the operational reality: how do you deploy it, monitor it, scale it, and evolve it as requirements change?

What earns a “strong hire” at L6: You drive the conversation. You do not wait for the interviewer to ask follow-up questions.

You proactively say: “Before I move on, let me address the failure scenario for this component.”

You discuss operational concerns: monitoring, alerting, deployment strategy, rollback plan.

You reason about cost: “This architecture costs roughly $50,000 per month in cloud resources. If we need to reduce that, the biggest lever is moving from real-time processing to batch for the analytics pipeline.”

You evolve the design: “If we need to go multi-region, the main challenge is the database. We would need to move from single-leader to multi-leader replication, which introduces conflict resolution.”

What gets you rejected at L6: You produce an L5-quality answer. It is correct, it is well-reasoned, but it stays in the “design” lane without touching operations, cost, or evolution.

The interviewer is looking for production experience, and an answer that does not mention monitoring, deployment, or incident response feels like a candidate who has designed systems on paper but not operated them in production.

For the concrete difference between L5 and L6 answers on the same question, what separates L5 from L6 with real grading shows actual answers at each level and explains why one scores higher.

For the mindset shift, how staff engineers think about problems differently from seniors covers the approach.

Staff+: Show That You Can Shape the System

Staff and principal engineer interviews go beyond a single system.

The interviewer may ask you to design a platform that supports multiple teams, or to evolve an existing system to meet new requirements.

The evaluation focuses on strategic thinking, organizational awareness, and the ability to navigate ambiguity.

What earns a “strong hire” at Staff+: You define the problem before solving it. You push back on requirements that do not make engineering sense.

You discuss how the system interacts with other systems in the organization.

You reason about build vs buy.

You design for extensibility: “I am structuring the API this way so that when we inevitably add feature X, the change is additive rather than breaking.”

For the scope difference between staff engineer and principal engineer roles, that guide covers what changes at the highest levels.

---

Part 2: The Scoring Rubric

Every company uses a rubric.

The dimensions are similar, but the weights differ. Understanding the weights tells you where to invest your 45 minutes.

• Requirements Gathering (10-15%): Did you ask the right questions? Did you scope the problem appropriately? Asking too few questions suggests you are memorizing a template. Asking too many suggests you are stalling.

• High-Level Architecture (20-25%): Did you draw the right components? Did you explain the data flow? Did you justify the inclusion of each component?