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      Hardware Engineer Interview

      2 Aug 2020
      Anonymous interview candidate
      New York, NY
      No offer
      Negative experience
      Average interview

      Application

      I applied online. I interviewed at Wesper (New York, NY) in July 2020

      Interview

      The interview process took about 3 weeks total in July 2020, and in the end, I let them know I was no longer interested in continuing the interview process. There was an initial phone screen (non technical), followed by a technical video interview with the engineering VP. After the video interview, there was a 'take home' project to be completed and then reviewed with their entire team. According to the interviewer, the project should take about 3 days time, but can be spread over the course of up to a week to be completed. Initially, I was very excited about the company, the team and their project. It was actually a pleasure to speak with both interviewers on the phone and video interviews but when I had read through the assignment and gave it some thought, it seemed very detailed and in depth for an interview. I've heard of interview projects before but this is the first time I've received one myself, so I emailed the interviewer back to ask what the results of the project would be used for, and if we could change the scope of the project to something less detailed. Instead of a transparent reply and answer, they told me that, "if [I] was implying that they are using the interview process for free labor, then [I] must not think much of [their company.]" They also did not want to change the scope of the project (fair, it's their call and just a suggestion on my part). Now my opinion: The interviewer's reply to my question is the biggest red flag in this interview. A valid question was asked and instead of answering, they were evasive and defensive. It shows how your future manager would behave if their employees ever voiced a concern to them or if there's a difference of opinion. Later I checked Glassdoor and saw others felt they were being used for free labor. I don't know if that's Tatch's intent at all, which is why I asked, but it seems like their interviewing style is giving off that impression to others, which should tell them they might want to rethink their interviewing process. The way I understood project interviews in the industry is that they generally take a couple hours at most, and the content of the project should never be able to be mistaken for something that can be used in a company's product.

      Interview questions [6]

      Question 1

      Analog signal questions (i.e. Using passive components, and a digital I/O pin, how would you generate a sine wave?)
      Answer question

      Question 2

      Design an input stage circuit which accepts two input electrodes, and outputs a signal to an A/D, which will output to an MCU with a certain amount of given constraints in their specification (leaving out their actual values here) * Input signal voltage range, frequency range, input impedance * Various noise factors (i.e. thermal noise range, electrode noise, electrode movement artifacts, noise from power supply) * Sampling rate by MCU * Physical constraints of PCB, component height requirements, PCB placement requirements, board size requirements * Electrical constraints (i.e. current limits, amplifier gain spec, electrode impedance, frequency band limits) * IEC60601-1 Medical Safety Standard current limits
      Answer question

      Question 3

      Project deliverables * All schematics * BOM (bill of materials) including all major parts * Any other documents for your design * Short description about your approach and choices
      Answer question

      Question 4

      Discussion questions about noise floor, CMRR, effects of electrode impedance imbalance, voltage levels for battery selection.
      Answer question

      Question 5

      More discussion: * How would you test the design (equipment selection, methods, challenges) * They are considering a flex PCB - what are the challenges that come from switching to flex PCBs and how to handle those issues
      Answer question

      Question 6

      Optional: SPICE analysis using free software
      Answer question
      2
      avatar
      Wesper response
      5y
      Thank you for your review of our process. We enjoyed speaking with you about our HW opening as well. We regret the brashness of our team’s response and will try to be much more flexible when it comes to project scope in the future. We are a small team that is growing and learning everyday. Since we are working on a niche product in a specific industry we want candidates that may ultimately come to work with us to be familiar with what exactly we do. The interview project intentionally simulates the kind of work we do here but will never be implemented into our product. With the help of your feedback, we will be altering the project accordingly. Thank you again and we wish you the best! Feel free to reach out directly to careers@tatch.com with any further feedback. -Tatch Hiring Team