FAANG engineering levels explained
Google runs L3 (entry) to L8 (principal); Meta uses E3 to E8 and Amazon SDE I to Principal. The bands map loosely and the titles are not interchangeable. What is consistent is the axis: each rung widens the scope you own and shifts what is being judged, from whether the code works to whether the direction was right.
The ladders differ in detail and the mapping between them is approximate, so treat any table of equivalences as a rough guide rather than a conversion rate. What transfers is the shape.
L3 / E3 is entry: the task is given and completion is the bar. L4 / E4 is the level at which you are trusted to break a problem down yourself. L5 / E5 is senior - you own a service and the design is yours. L6 / E6 is staff, where the blast radius reaches other teams. L7 / E7 is senior staff, where problem selection is the deliverable. L8 is principal, where the scope is the organisation's technical direction.
Two things people consistently get wrong. First, the individual-contributor and management ladders run in parallel from L6 upward - going up does not mean managing people. Second, the same title carries wildly different scope at different company sizes; a staff engineer at a 200-person company and one at Google are not doing the same job.
What to actually study
Real modules from the curriculum, in the order they make sense. Every video each one points at is free.
- DeploymentThe Language of SystemsThe five behaviours every production system exhibits, stated as maths before they are stated as advice.6 lessons
- Everything DataData ModelingDesign data models that support analytics, feature engineering, training, and serving without leakage or excessive complexity.7 lessons
Common questions
- What are the Google engineering levels?
- L3 entry, L4 software engineer, L5 senior, L6 staff, L7 senior staff, L8 principal. L3 and L4 are the only levels with an expectation of promotion within a fixed window; from L5 upward the level is terminal unless you seek the next one.
- How do Meta and Amazon levels map to Google's?
- Loosely: Meta E3-E8 tracks Google L3-L8 fairly closely, while Amazon's SDE I / SDE II / SDE III / Principal compresses the same range into fewer bands, so one Amazon level can span two elsewhere.
- Does a higher level mean managing people?
- No. From L6 upward the individual-contributor and management ladders run in parallel. An L7 engineer and an L7 manager are the same level with different jobs.
No course promotes anyone. Levels are awarded by employers against their own ladder, on evidence collected over months. What material like this can do is close a specific knowledge gap that is currently in the way.
Every level