Engineering at Zomato — Scale and Challenges
Zomato is India's largest food delivery platform with 100M+ customers, 300,000+ restaurant partners, and 400,000+ delivery partners. The engineering challenges at Zomato span real-time logistics (matching hungry customers with restaurants and delivery partners), recommendation systems, payments, and supply chain at massive scale.
Zomato's tech stack includes Go (for high-performance services), Python (data/ML), and Java/Kotlin. They've built some of India's most complex geo-spatial systems (restaurant discovery, delivery routing) and real-time ML systems (ETA prediction, demand forecasting).
Zomato's Engineering Scale
Zomato handles 10M+ daily orders, each involving real-time restaurant matching, delivery agent assignment, live ETA calculation, payment processing, and push notifications — all within seconds. Understanding this scale context impresses interviewers.
Zomato Interview Process — All Rounds
Round 1
Online Assessment
2–3 DSA problems on HackerRank. 75 minutes. Medium difficulty focus. Arrays, Graphs, and HashMaps most common.
Round 2
Technical Interview 1 (DSA)
2 DSA problems with discussion. Interviewers probe multiple approaches and time/space optimization. Graphs appear frequently (delivery routing context).
Round 3
Technical Interview 2 (LLD)
Machine coding or LLD. Food delivery domain problems common: order management, delivery tracking, restaurant inventory.
Round 4
System Design (SDE-2+)
Design food ordering pipeline, real-time ETA system, restaurant recommendations, notification system at Zomato scale.
Round 5
HR / Culture Round
Culture fit, growth mindset, past experience discussion. Zomato values speed, ownership, and data-driven thinking.
DSA Topics — Zomato Frequency
| Topic | Frequency | Difficulty | Zomato Angle |
|---|---|---|---|
| Graphs (BFS/DFS/Dijkstra) | Very High | Medium | Delivery routing, nearest restaurant, service area detection |
| Arrays & Sliding Window | Very High | Medium | Order analytics, surge pricing windows, delivery SLA tracking |
| HashMaps & Frequency | High | Easy–Medium | Menu frequency, most ordered items, user preferences |
| Trees & Binary Trees | High | Medium | Category trees (menu hierarchy), BST for inventory |
| Greedy Algorithms | High | Medium | Delivery agent assignment, route optimization |
| Dynamic Programming | Medium | Medium | Discount optimization, travel time minimization |
| Priority Queues / Heaps | Medium | Medium | Order queue management, nearest driver to restaurant |
| Sorting & Searching | Medium | Easy–Medium | Restaurant ranking, search relevance, menu search |
Graph Problems at Zomato
Zomato asks graph problems more than most Indian product companies. Study: Dijkstra's shortest path, BFS nearest neighbor, topological sort, and cycle detection. Framing graph solutions in a delivery/logistics context (e.g., "In Zomato's delivery routing, nodes are locations and edges are road segments...") is highly valued.
System Design — Zomato-Specific Topics
| Design Topic | Relevance | Key Concepts |
|---|---|---|
| Food Ordering Pipeline | Core product | Order creation, restaurant acceptance, state machine, cancellation handling, payment integration |
| Delivery Agent Assignment | Logistics core | Geo-hashing, nearest agent matching, capacity management, real-time agent state updates |
| Real-time ETA System | User experience | ML prediction pipeline, traffic integration, live order state updates, Kafka for events |
| Restaurant Search & Discovery | Catalog | Elasticsearch, location-based filtering, personalized ranking, filtering by cuisine/rating/time |
| Surge Pricing Engine | Revenue | Real-time demand monitoring, pricing tiers, A/B testing, user communication |
| Review & Ratings System | Trust | Verified review (must have ordered), fraud detection, aggregation, real-time updates |
| Push Notification System | Engagement | Order status updates, promotions, priority queues, deduplication, opt-out handling |
Classic Zomato System Design Questions
1
"Design Zomato's order management system"
From order placement to delivery completion — all states, transitions, failure handling.
2
"How would you design Zomato's nearest delivery agent assignment?"
Handle 400K agents, real-time location updates, surge conditions, fairness across agents.
3
"Design Zomato's restaurant search with geo-location and personalization"
Geo index, cuisine filter, real-time rating aggregation, personalized ranking.
4
"Design Zomato Gold — subscription management system"
Subscription tiers, trial handling, renewal, benefit tracking, restaurant partnership API.
LLD / Machine Coding at Zomato
| Problem | Core Concepts | Difficulty |
|---|---|---|
| Design a Food Delivery System | State machine, agent assignment, order tracking | Hard |
| Design a Restaurant Inventory System | Menu management, stock levels, out-of-stock handling | Medium |
| Design an Order Rating System | Observer pattern, verified reviews, aggregate scoring | Medium |
| Design a Coupon/Promo Engine | Rules engine, eligibility, stacking, expiry | Medium |
| Design a Delivery Route Optimizer | Graph traversal, multi-drop optimization, time constraints | Hard |
| Design a Live Order Tracking System | Observer pattern, WebSocket events, state transitions | Medium |
Order State Machine (Common LLD Problem)
enum OrderStatus {
PLACED, RESTAURANT_ACCEPTED, RESTAURANT_REJECTED,
BEING_PREPARED, READY_FOR_PICKUP, AGENT_ASSIGNED,
PICKED_UP, DELIVERED, CANCELLED
}
class Order {
private OrderStatus status;
void transition(OrderStatus newStatus) {
if (!isValidTransition(status, newStatus))
throw new IllegalStateException(
"Invalid transition: " + status + " -> " + newStatus);
this.status = newStatus;
notifyObservers(newStatus); // push notification, ETA update
}
private boolean isValidTransition(OrderStatus from, OrderStatus to) {
// Define valid transition map
return VALID_TRANSITIONS.getOrDefault(from, Set.of()).contains(to);
}
}
Real Zomato Interview Questions (2024–2026)
DSA Questions
1
Find the minimum number of stops to reach a destination (BFS/Dijkstra on graph)
Classic shortest path with optional weights — delivery routing context.
2
Given K delivery agents and N orders, assign orders to minimize maximum delivery time
Greedy + binary search on answer. Zomato-specific framing.
3
Sliding window — maximum orders in any K-minute window
Classic sliding window, but framed as Zomato order analytics.
4
Design a LRU Cache for restaurant data (menu + ratings)
HashMap + DLL implementation, eviction on capacity limit.
5
Clone a graph (used in cloning restaurant menu hierarchy)
BFS or DFS with HashMap for visited nodes. LC 133 variant.
6
Given a matrix of restaurant ratings, find the most connected high-rated cluster
DFS/BFS connected components on filtered graph.
Practice Zomato interview questions with AI feedback
Start Free Trial on PrepflixZomato Culture & Values
⚡
Speed & Execution
Zomato moves fast. They prefer someone who ships and learns over someone who plans endlessly.
📊
Data-Driven
All decisions at Zomato are backed by data. Interviewers respect candidates who quantify impact and ask about metrics.
👤
Customer Centricity
Hungry customers, restaurant partners, and delivery partners all deserve a great experience. Engineers are expected to empathize with all stakeholders.
🌱
Growth Mindset
Zomato is still growing fast. They want engineers who thrive in ambiguity and can scale their own thinking as the company grows.
Zomato SDE Salary 2026 — India
| Role | CTC Range | Base Pay | ESOPs (4-yr) |
|---|---|---|---|
| SDE-1 (0–2 yr) | ₹18 – 32 LPA | ₹15–25L | ₹5–15L |
| SDE-2 (2–5 yr) | ₹28 – 50 LPA | ₹22–38L | ₹10–25L |
| Senior SDE (5–8 yr) | ₹45 – 75 LPA | ₹35–55L | ₹20–40L |
| Lead / Staff Engineer | ₹70 – 110 LPA | ₹50–75L | ₹30–60L |
| Principal / Architect | ₹1 – 1.5 Cr PA | ₹70–100L | ₹50–80L |
3-Month Zomato Preparation Plan
Month 1
DSA Focus
- Graphs — BFS, DFS, Dijkstra, 30 problems
- Arrays + Sliding Window — 25 problems
- Trees + HashMaps — 25 problems
- Daily: 2 LeetCode medium problems
Month 2
LLD + System Design
- Implement food delivery system LLD
- Order state machine + live tracking LLD
- Study Zomato engineering blog posts
- Practice 3 system design problems/week
- 2 mock coding interviews
Month 3
Polish + Mocks
- Prepare 5 STAR behavioral stories
- Study food delivery domain deeply
- 3 full mock interview loops
- Review Zomato product features as an engineer
Frequently Asked Questions
How many rounds does Zomato SDE interview have?
Zomato typically has 4–5 rounds: Online Assessment, 2 Technical rounds (DSA + LLD/Machine Coding), System Design (SDE-2+), and an HR/Culture round.
What DSA topics are most important for Zomato?
Graphs (BFS, DFS, Dijkstra), Arrays (sliding window, prefix sums), HashMaps, Trees, and Greedy algorithms. Graph problems appear more frequently at Zomato than most Indian product companies due to the delivery routing domain.
What is the Zomato SDE-1 salary in India 2026?
Zomato SDE-1 CTC ranges from ₹18–32 LPA in 2026. Total compensation includes base salary, ESOPs, and performance bonus.
Does Zomato have a machine coding round?
Yes, Zomato regularly includes an LLD/machine coding round. Common problems include food delivery system design, order state machine, restaurant inventory management, and delivery route optimizer.
