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      Senior Software Developer Interview

      7 Feb 2024
      Anonymous employee
      Accepted offer
      Positive experience
      Easy interview

      Application

      I applied online. The process took 2 weeks. I interviewed at Lightspeed in Feb 2024

      Interview

      It involved three video-conferencing interviews between 30 minutes and 1 hour in length. The first interview was with the Priyanka, and it was excellent - she was very kind and supportive but also clear and direct about her questions and expectations for the role. Also she acted as a very responsive and helpful point of contact for the rest of the interviewing processes. The second interview was with two members of the Senior development/management staff. They were also very polite and kind, and asked relevant questions that explored my experiences and decision making with the technology and on projects. The third interview was with staff developers on the team and was a deeper dive into specific technical questions which included a real-time 'pair programming' session which explored how I would decide write/improve a block of code. All-in-all a great experience!

      Interview questions [3]

      Question 1

      Describe a challenging problem you solved using a similar technology stack.
      Answer question

      Question 2

      How do you decide what tech stack to use?
      Answer question

      Question 3

      How would your improve performance of this block of PHP code?
      Answer question
      avatar
      Lightspeed response
      2y
      Hi There, Thank you so much for sharing your experience with us! We're thrilled to hear that your interview process was positive and well-structured. It's great to hear that Priyanka provided excellent support and guidance throughout the process, setting clear expectations while maintaining kindness and responsiveness. We'll be sure to pass along your kind words to her. Welcome to Lightspeed, we're excited to working with you! - The Lightspeed Talent Acquisition Team

      Other Senior Software Developer interview reviews for Lightspeed

      Senior Software Engineer Interview

      21 Mar 2026
      Anonymous interview candidate
      Berlin
      No offer
      Negative experience
      Difficult interview

      Application

      I interviewed at Lightspeed (Berlin)

      Interview

      I experienced the interview process as very disrespectful. Only during the feedback conversation after my rejection did I learn that the position had effectively shifted toward a mid‑level role, something that had not been communicated to me beforehand. I was told that this feedback that I am, somehow, actually a mid level developer (despite covering the job of a senior) was told to me “for the sake of my future.” In my view, questioning a candidate’s seniority, especially when they have already held comparable roles for years, is inappropriate. I ultimately accepted a senior position elsewhere with higher compensation and full remote, without mandatory “pillar days” of attendance or whatever you called it. For me personally, remaining unemployed would have been preferable to working here.

      Interview questions [1]

      Question 1

      Mostly technical coding questions that in my opinion really relied on mnemonic knowledge and became obsolete after LLMs
      Answer question
      1

      Senior Software Engineer Interview

      18 Feb 2026
      Anonymous interview candidate
      Berlin
      No offer
      Neutral experience
      Difficult interview

      Application

      I applied online. I interviewed at Lightspeed (Berlin) in Feb 2026

      Interview

      The process started with an initial screening round, followed by a technical interview with system design and then a round with deeper technical discussion with code review. The team was professional and direct throughout the process. Communication from HR was clear and timely. The interviews were heavily focused on core Python fundamentals, concurrency concepts, messaging systems (queues, Kafka/RabbitMQ), transactions, and system design. The technical depth expected was quite high, especially around language-level concepts such as context managers, decorators, and concurrency primitives. In the later round, the discussion became very detailed around Python internals and low-level constructs. When I wasn’t able to confidently explain a specific core concept (context managers), the interview was concluded early with the feedback that for a Senior role, strong fluency in core Python fundamentals is expected. What I liked: Interviewers were technically strong and clearly knowledgeable. Questions were practical and relevant to backend engineering. Clear feedback was given directly. What could be improved: The process felt somewhat unforgiving; the interview was ended early based on one foundational gap rather than evaluating overall system design and backend experience. A slightly more holistic evaluation of seniority (architecture, real-world impact, problem-solving) alongside language fundamentals would make the process more balanced.

      Interview questions [1]

      Question 1

      Decorators Concurrency (GIL, threading vs multiprocessing) Transactions and atomic operations Messaging systems and delivery guarantees
      Answer question
      1

      Senior Software Engineer Interview

      3 Feb 2026
      Anonymous interview candidate
      Amsterdam
      No offer
      Positive experience
      Average interview

      Application

      I applied through an employee referral. I interviewed at Lightspeed (Amsterdam) in Jan 2026

      Interview

      The interview process consisted of a recruiter prescreening call, followed by an interview with the engineering manager, and finally an in-depth technical interview focused on problem solving, system design, and practical engineering skills.

      Interview questions [1]

      Question 1

      idempotency, canary deployment, blue-green deployment
      Answer question

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