Instacart DSA Interview Questions

What Instacart asks in the DSA round

Instacart pairs medium DSA with a domain-flavoured design round on catalogue, cart and fulfilment. Expect hash maps, heaps and clean handling of messy input.

Across the 18 questions on this page, the weight sits on these patterns:

• Binary Search — 3 questions · read the modified binary search guide
• Dynamic Programming — 3 questions · read the dynamic programming guide
• Greedy — 2 questions · read the greedy guide
• Matrix — 2 questions · read the matrix manipulation guide
• Sorting — 2 questions
• Backtracking — 1 question · read the backtracking guide
• Design — 1 question · read the design data structure guide
• Simulation — 1 question

How to prepare for the Instacart interview

1. 1. Start at the top of the list above. The patterns are ordered by how often Instacart uses them, so the first two or three buy you the most coverage per hour.
2. 2. Solve by pattern, not at random. Doing eight binary search problems in a row is what makes the ninth recognisable in an interview — jumping between topics does not.
3. 3. Tick problems off as you go so the gaps are visible. The per-pattern counts tell you which Instacart topic you have actually covered.
4. 4. Write the approach before the code. Instacart interviews are judged on the reasoning as much as the working solution.
5. 5. Pair this with the pattern guides when a topic is new, and the system design sheet if the role is senior enough to have that round.
6. 6. If this is a campus or off-campus drive rather than a lateral move, the placement preparation guide covers the stages around the DSA round — aptitude, core subjects and the HR interview — in the order they actually happen.

Instacart interview questions — FAQ

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