I applied online. The process took 3 weeks. I interviewed at Sisu Tech (Tallinn) in Mar 2026
Interview
Before I describe my interview process, the company name is SISU Group, but on Glassdoor it's SISU Tech. It can be misleading.
During the interview, the hiring manager, CXO, was very sarcastic, making jokes about how it was not an interrogation. However, the discussion focused heavily on detailed processes from my previous role. Two additional team members who report to the hiring manager were present in the interview; they appeared disengaged, made minimal eye contact, and spoke very little throughout the conversation.
I was rejected weeks later, and their HR emailed me saying that they decided to move forward with another candidate. Minutes after I received the rejection email, they reposted the job ad on Linkedin.
Very suspicious experience overall. They are not trustworthy.
I applied online. The process took 2 weeks. I interviewed at Sisu Tech (Tallinn) in Nov 2025
Interview
I had process started with an HR interview with Ginta Baranauskaite. After that, I was invited to onsite technical interviews. The onsite interview had two steps. One technical interview was with Mikk Villem, focused on React.js. The task was related to an input where the backend checks whether the value is an anagram.
The second technical interview was with Martin Puutka. He asked a coding question similar to a Codewars problem about summing multiples of 3 or 5. I solved the problem correctly, but the discussion moved to very low-level topics such as CPU cycles and micro-optimizations. I clearly stated that I do not have deep, low-level CPU cycle optimization experience
I took one full day off from work to attend these onsite interviews. After the interviews, I was rejected with an automated message. The second step of the recruitment process was handled by Patricia Barranquero. I contacted the recruiter and both interviewers politely to ask for specific feedback, but I did not receive any response.
Rejection itself is acceptable, but the lack of feedback after multiple interview stages and an onsite visit feels disrespectful. Candidates invest time and effort, and basic, constructive feedback would help understand weaknesses and improve for future interviews. The interview process could be much more professional and transparent.
Interview questions [1]
Question 1
a React.js task was related to an input where the backend checks whether the value is an anagram.
The process took a long time. After the call with HR and technical task, I waited for more than a month for any response. The technical interview was medium level of difficulty using TypeScript.
Interview questions [1]
Question 1
How do hash maps work and why the access time is constant?
