Design a warehouse slotting & optimization platform
PremiumBackend systemMedium
- Event driven
- Inventory management
- Rate limiting
Quick answer
This backend system interview question asks you to design a warehouse slotting & optimization platform. Aim for a design that meets its requirements at the stated scale, then explain its main components, data flow and trade-offs. Interviewers want to see how you scope the problem, size it and defend each choice.
The problem
Design the backend for a real-time warehouse slotting and inventory optimization platform. As warehouse workers pick and stow items, their handheld scanners emit telemetry events. The system must maintain real-time inventory location state, generate optimized "slotting" tasks (e.g., instructing workers to move forecasted high-demand items to easily accessible bins), and generate optimized picking routes for active orders.
What must a warehouse slotting & optimization platform do?
- Telemetry Ingestion: Ingest scan events from worker devices (item_id, bin_id, action_type, timestamp, worker_id).
- Real-Time State: Maintain an accurate, queryable state of exactly which items are in which bins.
What scale should you design for?
Use these numbers in your estimates.
The scale numbers unlock with this questionUnlock
Key concepts
- Event driven
- Inventory management
- Rate limiting
- Asynchronous processing
- State tracking
- Logistics
How you’ll practise
- Requirements
- Estimate
- API and data
- High-level design
- Deep dives
- Wrap-up
Lala, personalized to you, gives a hint when you ask and reviews your design when you are ready.
What do interviewers look for?
In any backend system design round.
- Clarifies the requirements before drawing anything
- Uses a few numbers that actually change the design
- Draws a clear path from the client to storage
- Picks storage and caching with reasons, not by habit
- Explains what breaks first under load and how to fix it
- States trade-offs openly instead of claiming a perfect design
Questions people ask about this interview question
- Which design type is this question?
- It is a backend system question. You design a warehouse slotting & optimization platform and explain your choices the way you would in an interview.
- Is this question asked at entry level?
- It is marked Medium. Entry-level engineers can practise it, but it expects you to reason about requirements and trade-offs, not only list components.
- What should I cover first?
- Start with the requirements: what the system must do, how well it must do it and which numbers change the design. Agree on scope with the interviewer before you design anything.
- Can I practise it for free?
- It is a premium question. Sign up and unlock it once for 10 credits; it then stays unlocked. When you finish, Lala, your personalized AI mentor, can review your design for 30 credits.
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Updated · Written by the SevyDevy team