Backend Engineer Interview Questions
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Coupang System Design: Large Video Upload (Backend)
Plan a scalable, fault-tolerant large video upload system with chunked, resumable uploads, object storage and processing. Review trade-offs and interview prep.
Databricks Behavioral: Skill Development Guide for Engineers
Prepare for Databricks behavioral interview on skill development: learn how to present learning from internships, feedback-driven growth, and handling ambiguity. Practice now.
Databricks Code: Shortest Path in a Fibonacci Tree
Find the node sequence on the path between two labels in a preorder Fibonacci tree (0/1-based). Get an index-based O(k+L) method for Databricks.
Databricks OOD Question: Scalable Playlist System Design
Design a scalable song playlist system for Databricks interviews — learn data models, APIs, concurrency strategies, and performance trade-offs. Get actionable guidance.
Databricks System Design: Multi-threaded Event Logger
Design a multi-threaded event logger: thread-safe, low-latency architecture for high-throughput backends. Covers async batching, durable outputs, and backpressure.
DoorDash Behavioral Interview: Conflict Resolution
Prepare for DoorDash behavioral interviews on conflict resolution. Learn to structure examples, show de‑escalation and communication skills—practice these tips.
DoorDash Database Scaling Interview: Sharding & Partition
Prep DoorDash database scaling interview: learn partitioning vs sharding, strategies, trade-offs and real-world examples. Practice follow-up scenarios now.
DoorDash System Design: Global Donations & Campaigns
Prepare for DoorDash design rounds: build a scalable, secure global donation platform for time-bound campaigns with payment integration and real-time tracking.
DoorDash System Design: Reliable Scalable Payment Processor
Design an idempotent, available payment processing system for DoorDash-scale e-commerce. Cover architecture, queues, retries, PCI, security, and webhooks.
eBay Coding Question: Increasing Triplet Subsequence
Check if an array contains a strictly increasing subsequence of length 3. Study the O(n) greedy/two-pointer solution, edge cases, and interview tips. Try it.
eBay CS Fundamentals: Cache Memory Write Policies Explained
Understand write-back vs write-through cache policies, write allocation and coherence for eBay software engineer interviews. Read examples and prep answers now.
eBay System Design: Concert Ticketing with Real-Time
Design a scalable concert ticketing backend for eBay: prevent oversells, ensure <100ms reads, integrate social views, and handle peak traffic. Learn the design.
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