TL;DR: I was approached by an external recruiter for a Mechanical Engineer, Modular R&D position at Fluidstack. I went through external and internal recruiter screenings, a technical interview, a behavioral interview, and a leadership interview before ultimately being rejected. Despite the outcome, I had a generally positive experience. Sharing this because I found very little information about Fluidstack's mechanical engineering interview process online.
Disclaimer: This post was organized and summarized with the assistance of AI. However, all experiences, observations, and opinions are my own, based on my recollections while the interview process was still fresh.
Background
I'm a Senior Mechanical Design Engineer with approximately six years of industry experience, primarily in new product development, mechanical design, CFD/FEA, manufacturing, and taking products from concept through production and field deployment.
I also have a research background in robotics and electromechanical systems.
Although I don't have direct data-center experience, the role seemed closely aligned with my background in mechanical systems, fluid mechanics, modular design, and product development.
Stage 1: External Recruiter Screening
I was initially approached by an external recruiter who introduced me to Fluidstack and the Modular R&D position.
We discussed my professional background, engineering experience, the nature of the role, and what the company was looking for.
The position sounded interesting, particularly because of the emphasis on engineering ownership, developing complex mechanical systems, and working in a fast-paced environment.
The recruiter was professional and remained involved throughout the process, providing updates and helping me navigate the different interview stages.
Stage 2: Internal Recruiter Screening
The next conversation was with Fluidstack's internal recruiter.
This was a relatively straightforward discussion about my experience, professional interests, and how my background aligned with the position.
We also discussed the role and the broader expectations of working at Fluidstack.
The conversation went well, and I was subsequently invited to the technical interview.
Stage 3: Technical Interview
This was probably the most technically challenging part of the process.
The interview lasted approximately 30 minutes and began with a discussion of my engineering background and previous projects.
The technical portion focused on mechanical engineering fundamentals, practical problem-solving, and applying engineering principles to unfamiliar situations.
I found the interview challenging but fair.
Rather than simply testing whether I knew specific terminology, the discussion gave me opportunities to demonstrate how I approach engineering problems and reason through them.
Although I didn't have direct data-center experience, I felt that my background in mechanical engineering and product development helped me navigate the conversation.
The interviewer was knowledgeable, professional, and engaging.
Overall, I enjoyed the technical discussion and was pleased to eventually advance to the next stage.
The Waiting Period
There was a delay of nearly two weeks following my technical interview.
The uncertainty was frustrating, especially after what I felt was a reasonably good interview. However, once the process resumed, communication and scheduling improved considerably.
Stage 4: Behavioral / Values Interview
This was probably my favorite interview of the entire process.
The conversation was with a technical leader within the organization and focused on my professional experiences, working style, and approach to engineering challenges.
The broader themes involved ownership, accountability, collaboration, resourcefulness, and navigating uncertainty.
I particularly appreciated that the discussion felt conversational rather than like a series of generic behavioral questions.
I had opportunities to discuss real engineering experiences, including difficult situations, decisions I had made, and lessons learned throughout my career.
The interviewer was extremely engaging, and I genuinely enjoyed the conversation.
I left the interview feeling positive about my performance and was subsequently invited to the next stage.
Stage 5: Organizational Leadership Interview
The next stage was a shorter conversation with a leader in the organization.
Compared with the previous interviews, this discussion felt more focused on my broader professional background, motivations, and potential fit within the team.
It was an opportunity to discuss my interests, career direction, and the type of engineering environment where I believe I perform best.
The conversation was professional, and I appreciated the opportunity to learn more about the organization from a leadership perspective.
Final Outcome
Unfortunately, I ultimately received a rejection.
Naturally, I was disappointed.
Having progressed through several interviews and received encouraging signals along the way, I had become genuinely interested in the opportunity.
I also felt that my experience aligned well with many aspects of the position, despite coming from a different industry.
That said, I understand that performing well in interviews doesn't necessarily guarantee an offer, and there are many considerations involved in a hiring decision.
I don't have sufficient insight into the final decision to speculate about why I wasn't selected.
Overall Impression
Despite the rejection, I would describe my experience interviewing with Fluidstack as generally positive.
The people I interacted with were knowledgeable, professional, and genuinely interested in understanding my engineering background.
I particularly appreciated the technical and behavioral interviews. Both gave me opportunities to discuss meaningful engineering experiences rather than simply repeat information from my resume.
Another positive was the willingness to consider candidates from adjacent industries. As someone without direct data-center experience, I appreciated being evaluated on my transferable engineering skills.
The biggest downside was the waiting period and the uncertainty surrounding interview timelines.
However, the external recruiter was helpful throughout the process, and the conversations themselves left me with a positive impression.
Advice for Future Candidates
For mechanical engineers considering Fluidstack, I'd recommend being comfortable with your engineering fundamentals and, more importantly, understanding how to apply them.
Be prepared to explain your previous projects beyond simply describing what you designed.
Think about the engineering decisions you made, the constraints you encountered, the alternatives you considered, and how you ultimately delivered results.
For behavioral interviews, I found it helpful to reflect on actual experiences rather than memorize polished answers.
I would also recommend learning about Fluidstack's publicly stated values and understanding whether its working environment genuinely appeals to you.
Above all, be prepared to communicate your engineering thought process clearly.
Good luck to everyone interviewing, and to those currently navigating the job market!
Note: I've intentionally excluded specific interview questions, internal discussions, and potentially confidential information. This post reflects only my personal experience and opinions.