Uber L4 Loop

Company GuideMidSoftware Engineer II · Last checked Nov 2026

L4 adds system design to the coding loop. A clean high-level design with sensible storage choices meets the bar, and the collaboration round looks for features you owned end to end.

The Rounds

Screens

Recruiter CallCovers your background, target team, and level expectations. · 30 minPractice Recruiter Call
Online AssessmentSome candidates only: timed coding problems, scored automatically.Practice Online Assessment
Technical Phone ScreenOne or two medium problems in CodeSignal, written to run and tested as you go. · 60 minPractice Technical Phone Screen

Onsite

Coding: Algorithms and Data StructuresMedium problems on graphs, heaps, intervals, and sliding windows, with runnable code. · 60 minPractice Coding: Algorithms and Data Structures
Coding: Depth in SpecializationAnother algorithms round, or a role-specific build with design elements. · 60 minPractice Coding: Depth in Specialization
System DesignOften a problem from Uber's own scale, such as tracking every active driver on a map. · 60 minPractice System Design
Collaboration and LeadershipUsually with the hiring manager: past projects, teamwork, and how you handled setbacks.Practice Collaboration and Leadership

What the L4 Loop Weighs

A high-level design with storage choices you can justify.
Runnable code across two coding rounds, with edge cases tested.
Features you owned from design through production.
Clear reasoning about the tradeoffs in each round.

Sources

Last checked Nov 2026. Loops vary by team and change over time, so confirm the details with your recruiter.