4 rounds
DSA → Core Java → System Design → HR
₹16–22L
SDE1 (fresher) compensation range
₹24–30L
SDE2 (2–4 yrs) compensation range
₹40–55L
Senior SDE (5–8 yrs) compensation range
The Interview Process
| Round | Format | What's Tested |
|---|---|---|
| Online Assessment | 90–120 min | DSA problems, medium difficulty |
| Round 1: DSA | Live coding | Data structures and algorithms — arrays, trees, graphs, hashmaps |
| Round 2: Core Java | Live, conceptual + coding | OOP principles, collections, multithreading, JVM basics |
| Round 3: System Design | 45–60 min | Mobility-platform-style design problems (see below) |
| Round 4: HR | 30–45 min | Culture fit, compensation discussion, role expectations |
The full process typically takes around 4 weeks end-to-end.
Real System Design Questions Reported
- Code an LRU cache — a classic but genuinely tests clean implementation under time pressure
- Design a custom hashmap data structure — tests understanding of underlying data structure mechanics, not just usage
- Design a custom load balancer — relevant to Ola's real-time, high-throughput ride-matching infrastructure
- Multithreading-focused questions — concurrency control, race conditions, thread safety — reflects the real-time nature of ride-matching and pricing systems
Why Multithreading and Custom Data Structures Show Up So Often
Ola's core systems — ride matching, dynamic pricing, driver allocation — are inherently concurrent and latency-sensitive. Questions like "design a custom load balancer" or "implement an LRU cache from scratch" aren't abstract CS-101 exercises here; they map directly to real engineering problems Ola's platform team solves. Understanding the why behind these questions helps you answer with more relevant context.
Core Java Round Focus Areas
| Topic | What's Commonly Asked |
|---|---|
| Collections | HashMap internals, ConcurrentHashMap, when to use which collection |
| Multithreading | Thread lifecycle, synchronization, deadlock scenarios, executor services |
| OOP design | SOLID principles applied to a realistic class design problem |
| JVM basics | Garbage collection fundamentals, memory model basics |
Our Java interview questions guide covers all of these areas with worked examples.
Prep Priority
1. Standard DSA at medium difficulty — non-negotiable baseline. 2. Core Java with real multithreading depth — this round is reportedly more substantial than at many product companies. 3. Practice implementing common data structures (LRU cache, custom hashmap) from scratch, not just using built-in library versions. 4. Light system design practice on real-time, high-throughput systems specifically.