Meta E3 (Junior) Software Engineer Interview Guide

A comprehensive guide to the Meta junior interview process.

Published Aug 3, 2025

The Meta E3 junior software engineer interview process starts with a recruiter screen, followed by an online coding assessment, then a technical phone screen, and finally a virtual onsite loop with 2 coding rounds and 1 behavioral interview. As of late 2025, one of those onsite coding rounds may be an AI-enabled session where you work alongside an AI assistant, so don't be surprised if your loop looks a little different from older write-ups. After passing these interviews, you'll go through team matching conversations with potential hiring managers before receiving your final offer. The entire process usually takes 4 to 12 weeks from start to finish, though scheduling delays and team matching can stretch it toward the longer end of that range.

The coding rounds carry the most weight in your evaluation, since they test the core technical skills you'll lean on day to day. But the behavioral interview matters more than most candidates expect. It decides your cultural fit and whether you align with values like "Move Fast" and teamwork, and a weak showing there can sink an otherwise strong loop. The bar is calibrated differently at this level, too. What sets E3 apart from higher levels is the focus on fundamental coding ability and learning potential rather than system design expertise or leadership experience.

Interview Rounds

Online Assessment (OA)

Meta's online assessment is the first screening step, administered through CodeSignal with full video and microphone monitoring throughout the 90 minute session. This is a new addition to Meta's process as of 2025. You'll need to pass this before moving to the phone screen stage.

The assessment consists of a single complex problem divided into 4 progressive stages that unlock sequentially. Recent examples include designing an in memory database with key value operations or implementing a cloud based file storage service. Each stage builds on the previous one:

• Stage 1: Basic core features (simple get/set operations) that test fundamental correctness and corner case handling
• Stage 2: Additional constraints (TTL expiration mechanism) that introduce new functionality
• Stage 3: Advanced capabilities (point in time queries or data versioning) with more complex features
• Stage 4: Performance intensive operations (deletion with concurrency handling) that are the most challenging

You're allowed to open reference tabs for programming syntax but cannot search for solutions or use AI tools. The platform provides viewable unit tests (which you cannot modify) and includes a separate scratch area where you can write debug code or print statements to test your solution.

Most candidates don't complete all 4 stages. You commonly run low on time in Stage 3 or 4, and CodeSignal's own documentation says the same thing about its assessments. Don't be discouraged if you don't reach Stage 4. Meta knows this is challenging within 90 minutes.

Recruiter Phone Screen

The recruiter phone screen is your first real conversation with Meta, and it's straightforward compared to what comes next. You'll spend about 30 minutes on a video call or phone with a recruiter who wants to get to know your background and gauge your interest in the company.

Most of the conversation revolves around your "tell me about yourself" story. The recruiter wants to understand your educational background, any internships or projects you've worked on, and what drew you to software engineering in the first place. Since you're applying for an E3 role with 0 to 2 years of experience, they're not expecting a polished career narrative.

What catches many candidates off guard is how much the recruiter focuses on your motivation for wanting to join Meta specifically. You need to articulate why Meta's products or mission resonate with you personally.

Technical Phone Screen (Coding)

The technical phone screen is where Meta starts evaluating your actual coding ability live, and it's a significant step up from the automated online assessment. You'll spend 45 minutes on a video call with a Meta engineer, typically someone from the team you might eventually join. After a few minutes of introductions and small talk, you'll solve coding problems using a shared editor like CoderPad.

Expect to work through two medium difficulty problems that feel similar to what you'd find on LeetCode, though they might have a Meta specific twist or context. The shared coding environment is pretty bare bones compared to what you're probably used to.

Onsite

Coding Interviews (2 rounds)

The two onsite coding rounds are where Meta really puts your programming skills under the microscope. You'll face two separate 45 minute sessions with different Meta engineers, and these interviews carry the most weight in your final evaluation as an E3 candidate.

Behavioral Interview

The behavioral interview is where Meta really gets to know you as a person, and it carries just as much weight as your coding performance in the final decision. You'll spend 45 minutes with a Meta engineer or hiring manager who wants to understand how you work with others, handle challenges, and whether you'd thrive in Meta's environment.