I applied online. The process took 2 weeks. I interviewed at Vaisala
Interview
The interview process consisted of two stages: an initial screening call with the manager and an in-person interview at the company’s office.
During the on-site interview, there were two parts. The first part focused on general questions about my technology stack, previous experience, and background. The second part was a whiteboard system design session.
Both stages were well-organized and conducted in a professional manner. Overall, the interview process left a very positive impression.
Interview questions [1]
Question 1
How would you design a real-time monitoring system?
I applied online. The process took 2 weeks. I interviewed at Vaisala (Vantaa) in Feb 2026
Interview
The interview was very friendly and relaxed. It consisted of two 45-minute parts with different people. First, they presented the project, and then we covered both HR and technical questions. It didn’t feel like a formal interview—more like an enjoyable conversation about shared interests.
Online Aptitude Test – Logical reasoning, quantitative aptitude, and basic SQL queries (around 30 questions, 45 minutes).
Technical Round – Questions on Python, SQL joins, and data cleaning methods. Asked me to write a simple query to fetch top 5 highest salaries from an employee table.
Case Study Round – Given a dataset and asked to find key insights (e.g., identify sales trends and missing data issues).
Interview questions [1]
Question 1
Tell me about a challenge you faced in your studies or previous work, and how you overcame it