Systems Software Engineer Interview Experience - United States
Process
The company ghosted me for two weeks after the interview. Afterwards, they notified me that they were already interviewing another candidate onsite while interviewing me. The communication could have been improved especially since I believed the interview to have gone well.
Interviewing as a backup and the lack of communication were two key factors for this review.
Questions
The questions comprised of basic systems and networking concepts.
What is the difference between UDP and TCP?
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Interview Statistics
The following metrics were computed from 1 interview experience for the Illumio Systems Software Engineer role in United States.
Success Rate
Illumio's interview process for their Systems Software Engineer roles in the United States is extremely selective, failing the vast majority of engineers.
Experience Rating
Candidates reported having very negative feelings for Illumio's Systems Software Engineer interview process in United States.
Illumio Work Experiences
- 5.0GreatSoftware Engineer • Current EmployeeSunnyvale, CaliforniaJanuary 13, 2026Pros: The factors were a learning opportunity, leadership, people, culture, and work-life balance.Cons: None for me and everything is great.
- 5.0Good placeSoftware Engineer • Current EmployeeMay 12, 2021Pros: Successful company in rapidly growing marketCons: They were pretty conservative in re-opening with covid.
- 4.0Greate small company to work for, lots of growth opportunitiesSite Reliability Engineer • Former EmployeeSunnyvale, CaliforniaApril 25, 2025Pros: There are talented people, open to creative solutions, and good learning opportunities depending on your team.Cons: Lacks clear instructions/structure in some aspects, even though the company is 11 years old it still has some chaos of a startup and pays lower than similar companies within the same field
