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Full Stack Developer interview questionsSystem Design Interview round
A 60 min interview plan with a time-boxed script, what each question is for, and the signals to score against. Key skills: System Design, Architecture, Scalability, Microservices, Cloud Deployment.
Opening
· 5 minWho is interviewing, how the round will run, and a question to settle the candidate in. The standard openingSystem Design Challenge
What this part is for
Purpose
Evaluate technical knowledge and problem-solving skills in real-world scenarios related to system design, architecture, scalability, microservices, and cloud deployment.
Design a scalable web application for a social media platform that supports user profiles, posts, and a news feed. Consider aspects such as architecture, data storage, and API design.
What this question is for, and what to listen for
Purpose
Assess the candidate's ability to design a scalable system, choose appropriate technologies, and explain their design decisions.
Signals to score
- Clear understanding of requirements
- Logical and structured approach
- Considers scalability and performance
- Chooses appropriate technologies
- Explains thought process clearly
- Considers data storage and retrieval
- Designs efficient APIs
- Addresses potential bottlenecks
Follow-up questions
- How would you ensure the system scales with increasing users?
- What database would you choose and why?
- How would you design the API endpoints?
- Can you explain your choice of architecture?
If you had more time, what would you change in your design?
What this question is for, and what to listen for
Purpose
Assess the candidate's ability to reflect on their work, identify areas for improvement, and demonstrate critical thinking and problem-solving skills.
Signals to score
- Recognizes limits in their original design
- Points out clear areas to improve
- Suggests specific changes
- Talks about how changes could help performance
- Shares ideas clearly and logically
- Shows a desire to learn and improve
Follow-up questions
- What additional features would you consider adding?
- How would you improve the system's performance?
- Are there any potential security concerns you would address?
Great job on the system design challenge!
What this line is for
Purpose
Provides positive reinforcement to the candidate, helping to build confidence and create a supportive atmosphere before moving into the final part of the interview.
Closing
· 5 minTheir questions for you, and what happens next. The standard closingFull Stack Developer interviews — common questions
- Who is this Full Stack Developer interview plan for?
- It is written for the interviewer, not the candidate: the hiring manager, engineer or panel member running the System Design Interview round for a Full Stack Developer role. It gives you a 60 min script to follow in the conversation — 2 questions with what each one is for and the signals to score against — so you are not writing the round from scratch the night before.
- What does the System Design Interview round assess?
- This round is focused on: System Design, Architecture, Scalability, Microservices, Cloud Deployment. It works through System Design Challenge, scoring against 14 observable signals, with follow-up prompts on both questions for going deeper where an answer is thin.
- How is the 60 min split up?
- 5 min opening, 50 min on 2 questions and 5 min closing. The questions take in System Design Challenge (50 min). The timings are there so the round stays on schedule and every candidate gets the same shape of interview — which is what makes two candidates comparable afterwards.
- What other rounds should I run for a Full Stack Developer?
A single round does not cover a whole role. The other rounds in this library for a Full Stack Developer:
Hiring for this role?
Open this plan in Hirezen and make it a position in one click.
- Every interviewer runs the same script and marks the same signals.
- AI drafts the write-ups, and the debrief puts every read side by side.
- No ATS to set up first, and no bot in the call.
Free for your first open role.