Machine Learning Scientist Interview Experience - Ireland
Process
Round 1 — Talent Acquisition (30–45 min): Review of CV and experience. Friendly, organised, and positive tone.
Take-home: Classification task provided after the TA screen. Instructions weren't very clear.
Round 2 — Technical panel (60 min, US-based ML scientists/engineers): One panelist remained off-camera, didn’t introduce themselves, and spoke only once. The other interviewer was courteous but generally disengaged with my examples. A live LeetCode-style coding exercise was included without prior notice. I hadn’t prepared for that format and underperformed.
Questions
Difference between Xgboost and LightGBM.
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Interview Statistics
The following metrics were computed from 2 interview experiences for the PayPal Machine Learning Scientist role in Ireland.
Success Rate
PayPal's interview process for their Machine Learning Scientist roles in Ireland is extremely selective, failing the vast majority of engineers.
Experience Rating
Candidates reported having very negative feelings for PayPal's Machine Learning Scientist interview process in Ireland.
PayPal Work Experiences
- 4.0Used to be goodMachine Learning Scientist • Current EmployeeShanghai, Shanghai, ChinaApril 16, 2025Pros: Nice colleagues, Supportive manager, Work-life balance.Cons: It might close the whole site in the nearby future.
- 5.0Great culture and peopleMachine Learning Scientist • Current EmployeeShanghai, Shanghai, ChinaMarch 31, 2025Pros: Great culture and people. Working great.Cons: Tech depth is not enough.
- 5.0Good work-life balance, poor tech stackMachine Learning Scientist • Current EmployeeChennai, Tamil Nadu, IndiaJanuary 30, 2025Pros: Good work-life balance, hybrid model, good culture.Cons: Poor tech stack, slow, and too many processes.
PayPal Interview Questions
