How I Landed a Facebook Software Engineer Offer: 7 On‑Site Interviews and What I Learned

I recently completed seven on‑site interviews at a Silicon Valley tech company and received a software engineer offer from Facebook, and I’m sharing how I prepared and what I learned.

1. Years of preparation for Silicon Valley

While studying computer science in Australia, I dreamed of becoming a software engineer in Silicon Valley, which motivated me to focus on interview preparation. I quit my chief iOS engineer role in Melbourne, returned to Perth, and dedicated myself to preparing for these interviews, knowing the task would be challenging.

2. Interviewing is a skill

Interviewing is tough; only after being “tortured” by the first interview did I realize its difficulty. I used paid and free mock interview services that simulate coding and whiteboard sessions, which helped with pressure but covered only a small portion of real interviews. My advice: don’t interview for your dream role until you have accumulated some mock or real interview experience, because practice builds confidence.

3. Types of interviews I experienced

If you perform well in the initial phone screen, you may be invited to on‑site interviews that can last several days, each lasting 4–6 hours depending on the company. In my experience, on‑site interviews typically cover three main topics: algorithms, system design, and behavior, though some companies expand the scope.

(1) Algorithm interview

Interviewers ask you to solve problems on a whiteboard, assessing data structures, sorting, recursion, complexity analysis, patterns, and edge cases. I practiced daily for six weeks on a cheap hanging whiteboard, focusing on writing and analyzing code.

(2) System design interview

Interviewers ask you to design a system (e.g., a parking ticket system, chat service, or news feed) on a whiteboard, probing how you gather requirements, ask clarifying questions, and discuss high‑level architecture without writing actual code.

(3) Behavioral interview

Interviewers ask about personal experiences and how you handle situations. Typical questions include handling failure, biggest weakness, conflict resolution, and what you would do differently.

(4) Culture fit

This often accompanies behavioral interviews and evaluates whether you align with company values such as Facebook’s “move fast and break things” or Airbnb’s focus on hospitality.

(5) Pair programming

You work with another engineer on a coding task in a realistic environment, completing a list of requirements while being allowed to use resources like Stack Overflow.

(6) Bug‑finding and fixing

You receive a list of bugs to locate and fix, requiring familiarity with IDE quirks and frameworks.

(7) Domain‑specific knowledge

Interviewers test your expertise in APIs, memory management, and language‑specific features that cannot be transferred between languages.

(8) Operating‑system knowledge

Some roles include OS‑focused questions to assess your understanding of underlying mechanisms.

4. How to prepare

(1) Core knowledge to master

Practice writing code on paper or a whiteboard, then transfer it to an IDE for syntax highlighting.

Deeply understand data structures, their strengths and weaknesses.

Fully grasp Big‑O time and space complexity.

Master major sorting algorithms.

(2) When to start

Start as early as possible; many companies impose a 12‑month cooling‑off period after a failed interview, so early preparation helps you avoid long waits.