DSA Interview Roadmap
Backend Engineer
A Backend Engineer interview leans on 252 of the 370 curated problems. The other 118 are lower frequency for this role, still here, just not first.
Backend rounds keep coming back to the same few problems: an LRU cache, a rate limiter, meeting rooms, top-K and job queues. That means hash maps with linked lists, heaps, sliding windows and intervals; hard DP and backtracking are rare.
- Focus on
- 252
- Core topics
- 9
- Deprioritise
- 118
- Full catalogue
- 370
Track your progress on this roadmap: the map fills itself as you solve.
Start freeWhat this interview looks like
Backend rounds keep coming back to the same few problems: an LRU cache built from a hash map and a linked list, a rate limiter over a sliding window, and meeting rooms solved with a heap. Interviewers push past the first working answer to thread-safety and capacity edge cases.
What it leans away from
Dynamic programming and backtracking rank low for backend loops because the recurring problems rarely need them, and a backend round is judged on how you structure the state around the cache or queue. Not absolute: a backend round can still include a DP warm-up.
Beyond the coding round
This roadmap only orders the DSA problems a Backend Engineer interview draws on. The role itself also expects:
The whole path
- Phase 1 - DSA Foundation
- Phase 2 - Role Skill Gaps
- Phase 3 - Projects and Interview Proof
Phase 1 - DSA Foundation
The curation places 9 core topics first for this role, leading with practice problems.
Phase 2 - Role Skill Gaps
The curation balances theory and practice equally across these role-specific topics to complete the 252 focus problems.
Phase 3 - Projects and Interview Proof
The curation pushes 118 problems down for this role, so understanding the theory is the goal here.
Ready to actually walk this path?
Every topic above links to real problems, step-by-step pattern visualizers, and an in-browser compiler. Your progress tracks automatically as you solve.
Backend Engineer DSA questions, answered
How many DSA problems does a Backend Engineer need to solve?
About 252 of the 370 curated problems. Those sit in the 9 topics a Backend Engineer interview leans on; the remaining 118 are lower frequency for this role and are worth doing later rather than first.
Which DSA topics matter most for a Backend Engineer?
Arrays, Strings, Linked List, Heap, Sliding Window, Intervals and others: the core tier for this role. Topic priority is mapped per role rather than shared, so a Backend Engineer path deliberately differs from a generic sheet order.
Can a Backend Engineer skip some DSA topics?
Deprioritise rather than skip. 118 of the 370 problems are lower frequency for a Backend Engineer, so they belong after the core tier: not never, but not first. Interviews do occasionally reach outside the common ground.
Is this Backend Engineer roadmap free?
Yes. The roadmap, the problem list, the pattern walkthroughs and progress tracking are all free with no signup required to read. Only AI-generated insights are metered.
Other role roadmaps
Problem set and role mapping as of .