Google Cloud SWE building Layer 7 next-gen firewall — intrusion prevention/detection for enterprise cloud networking security

A Software Engineer role on Google Cloud's next-gen firewall product, adding Layer 7 security for intrusion prevention and detection against threats and malicious attacks. Implementation is in Go, C++, and Python, with an explicit design focus on Cloud Networking Security products.

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Likely format

Google's standard SWE loop: phone screen(s) with coding, followed by an onsite/virtual onsite of ~4-5 rounds mixing coding, system design, and a Googleyness/leadership behavioral round

What this interview tests

Go, C++, Python implementation for security-critical services
Layer 7 intrusion detection/prevention concepts
Cloud networking security system design (reliability, performance)
Network debugging (e.g., PCAP analysis)
Data structures and algorithms
Production triage across hardware/network/service layers

Common question themes

Design a Layer 7 firewall/intrusion-detection component that scales for enterprise cloud traffic

How would you balance security inspection depth against latency/throughput requirements

Walk through diagnosing a network issue using packet capture or similar tooling

Coding exercise in Go, C++, or Python involving data structures/algorithms

How do you triage a production networking incident from symptom to root cause

Code review practices for security-sensitive infrastructure code

How candidates describe it

Real Software Engineer interview stories — retold from candidates' public write-ups, with sources.

Google · L4 Software Engineer, Google CloudOffer

Google L4 Cloud Software Engineer Interview: Downleveled to L3

A referred candidate interviewed for an L4 software engineer role on a Google Cloud team in Bangalore, going through a phone screen, three onsite coding rounds (the third left unfinished), and a culture conversation, only to have the hiring committee offer L3 instead of L4; the candidate obtained the compensation letter and declined the next day because the pay was below their current salary.

Interviewed 2021 · Bangalore, India

Google · L3 Software EngineerOffer

Google L3 software engineer interview: phone screen, four coding rounds, and the Googleyness round

A candidate with two years of experience went from recruiter outreach to offer over about four months. The onsite was four 45-minute coding rounds — three of them featuring binary trees — and one round turned into a 25-minute chain of follow-ups about approximating an optimal solution at scale.

Interviewed June 2020 · Bangalore, IN

Google · L4 Software EngineerNo offer

Google L4 Software Engineer Interview: Eight Rounds, No Offer

An L4 Software Engineer candidate went through two phone screens, three onsite rounds, a culture conversation, and a team-matching call with a Google hiring manager, then watched the process stall for about a month and a half over a tightened experience requirement before an added extended round ended without an offer.

Interviewed February 2024 · Not specified

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