Rehearsal AI Research Team
VerifiedInterview preparation specialists with expertise in campus placements and technical hiring
About CoinDCX
CoinDCX is India's largest and safest cryptocurrency exchange, backed by investors like Coinbase Ventures and Polychain Capital. They offer crypto trading, staking, and have been pivotal in making crypto accessible to Indian users.
Founded
2018
Headquarters
Mumbai, Maharashtra, India
Employees
500+
Industry
Fintech / Cryptocurrency
Compensation & Roles
Fresher Package Range
12 - 22.5 LPA
15 LPA (SDE-1), 22.5 LPA (SDE-1 with strong profile)
Available Roles
Interview Rounds
CoinDCX has a rigorous process focused on DSA, problem-solving, and system design. They look for candidates who can build scalable systems and have genuine interest in fintech/crypto space.
Online Coding Assessment
90-120 minutes | HackerRank/HackerEarth
What to Expect
- ✓2-3 algorithmic problems of medium-hard difficulty
- ✓Focus on arrays, strings, trees, graphs
- ✓Some problems may have real-world context (trading, transactions)
- ✓Partial marks for correct test cases
Pro Tips
- ★Practice medium-hard LeetCode problems focusing on dynamic programming and graphs
- ★Code efficiency matters - O(n) solutions preferred over O(n^2)
- ★Handle edge cases explicitly - empty inputs, single elements
- ★Test with custom test cases before submitting
Common Questions
- •Implement an LRU cache with O(1) operations
- •Find the maximum profit from at most K stock transactions
- •Design a rate limiter for API calls
- •Find longest substring without repeating characters
- •Serialize and deserialize a binary tree
DSA Round 1
60 minutes | Live Coding (Video Call)
What to Expect
- ✓2 algorithmic problems with discussion
- ✓Interviewer observes your problem-solving approach
- ✓Asked to optimize after initial solution
- ✓Follow-up questions on time/space complexity
Pro Tips
- ★Think aloud - explain your approach before coding
- ★Start with brute force, then optimize
- ★Clarify requirements and edge cases upfront
- ★Write clean, readable code with meaningful variable names
Common Questions
- •Design a data structure for a leaderboard with efficient updates
- •Find median from a data stream
- •Implement a thread-safe queue
- •Detect cycle in a directed graph
- •Minimum number of jumps to reach end of array
DSA Round 2 / Low Level Design
60-75 minutes | Live Coding + Discussion
What to Expect
- ✓One complex algorithmic problem OR
- ✓Low-level design of a system component
- ✓Focus on OOP principles and design patterns
- ✓Discussion on trade-offs and alternatives
Pro Tips
- ★For LLD, start with requirements clarification
- ★Draw class diagrams before coding
- ★Apply SOLID principles in your design
- ★Discuss extensibility and how the design can evolve
Common Questions
- •Design a parking lot system with multiple floors
- •Implement a key-value store with TTL support
- •Design an order matching engine for trading
- •Implement a rate limiter with sliding window
- •Design a notification service
System Design / High Level Design
45-60 minutes | Whiteboard/Discussion
What to Expect
- ✓Design a scalable distributed system
- ✓Focus on components, data flow, and trade-offs
- ✓Questions on database choices, caching, messaging
- ✓For freshers, may be more conceptual than deep dive
Pro Tips
- ★Clarify functional and non-functional requirements first
- ★Start with high-level components, then zoom in
- ★Discuss database choices: SQL vs NoSQL, when to use each
- ★Cover scalability: load balancing, sharding, caching
Common Questions
- •Design a cryptocurrency exchange matching engine
- •Design a real-time price ticker system
- •Design a wallet service with transaction history
- •Design a notification system for price alerts
- •Design a simple trading bot architecture
Culture Fit / HR Round
30-45 minutes | Video Call with HR/Hiring Manager
What to Expect
- ✓Questions about your interest in crypto/fintech
- ✓Startup culture fit assessment
- ✓Career goals and growth expectations
- ✓Behavioral scenarios
- ✓Compensation discussion
Pro Tips
- ★Research CoinDCX products: CoinDCX Pro, Okto wallet
- ★Show genuine interest in crypto/blockchain technology
- ★Demonstrate startup mindset: ownership, learning, adaptability
- ★Ask thoughtful questions about team, tech stack, growth
Common Questions
- •Why do you want to work at a crypto startup?
- •What do you know about CoinDCX and our products?
- •How do you handle ambiguity and fast-paced environments?
- •Tell me about a project where you took ownership
- •What are your salary expectations?
Knowing the process helps. Simulating it helps more.
Start mock interview for CoinDCX"Walk me through a challenging technical problem you've solved."
Common in CoinDCX technical rounds. Practice explaining your thought process clearly.
Practice this questionTechnical Questions Bank
Data Structures & Algorithms
Implement an LRU Cache with O(1) get and put
MediumApproach: HashMap + Doubly Linked List. HashMap for O(1) access, DLL for O(1) removal and addition at ends.
Best time to buy and sell stock with at most K transactions
HardApproach: DP with states: day, transactions used, holding/not holding. Optimize space to O(K).
Design a data structure for finding median in a stream
MediumApproach: Two heaps: max-heap for lower half, min-heap for upper half. Balance heaps after each insert.
Implement a rate limiter (sliding window log)
MediumApproach: Store timestamps of requests. Remove old timestamps. Check count against limit.
System Design Concepts
How would you design a real-time price ticker?
MediumApproach: WebSocket connections, message queue (Kafka), time-series DB (InfluxDB), CDN for global distribution.
Design an order matching engine
HardApproach: Order book with priority queues (price-time priority), matching algorithm, trade execution, event sourcing for audit.
How to ensure consistency in a wallet service?
MediumApproach: Idempotency keys, two-phase commit or Saga pattern, event sourcing, eventual consistency with reconciliation.
Design a notification system for price alerts
MediumApproach: Store user alerts in DB, price change events to queue, alert checker workers, multi-channel delivery (push, SMS, email).
Backend & Web Concepts
Explain REST vs GraphQL with trade-offs
EasyApproach: REST = resource-based, multiple endpoints. GraphQL = single endpoint, client specifies data. GraphQL reduces over/under-fetching.
How does authentication work? JWT vs Sessions
EasyApproach: Sessions = server-side state. JWT = stateless, signed token. JWTs scale better, sessions more secure for sensitive apps.
Explain database indexing and when not to use
MediumApproach: Indexes speed reads, slow writes. Don't use on: frequently updated columns, small tables, columns with few unique values.
What is database sharding and its challenges?
MediumApproach: Horizontal partitioning across servers. Challenges: cross-shard queries, rebalancing, maintaining referential integrity.
Reading questions is helpful. Practicing them is better.
Practice technical questions for CoinDCX"Tell me about yourself and why you want to join CoinDCX."
First impression matters. Practice delivering a confident, structured introduction.
Practice this questionHR Interview Questions
Why CoinDCX and crypto industry?
What They Look For
Genuine interest in crypto/fintech, understanding of the industry, startup mindset
Sample Approach
Mention India's growing crypto adoption, CoinDCX's market leadership, interest in building financial infrastructure. Show you understand the regulatory landscape too.
What do you know about our products?
What They Look For
Research, genuine interest, product thinking
Sample Approach
Mention CoinDCX Pro for advanced traders, CoinDCX Go for beginners, Okto wallet for Web3, staking products. Show you've actually explored the app.
How do you handle ambiguity and changing requirements?
What They Look For
Startup mindset, adaptability, problem-solving without complete information
Sample Approach
Give example where requirements changed mid-project. Explain how you communicated, reprioritized, and delivered. Show comfort with iterative development.
Tell me about a time you took ownership beyond your role
What They Look For
Initiative, ownership mentality, impact-driven thinking
Sample Approach
Describe a situation where you identified a problem and solved it without being asked. Could be a college project, hackathon, or internship. Quantify impact if possible.
Where do you see yourself in 3 years?
What They Look For
Ambition aligned with startup growth, technical depth, leadership potential
Sample Approach
Technical leadership track: senior engineer, tech lead. Mention wanting to build impactful products, mentor others, and grow with the company's success.
HR questions seem easy—until you're in the hot seat.
Practice HR questions for CoinDCXPreparation Strategy
Recommended timeline: 6-8 weeks
DSA Foundation (Week 1-3)
(3 weeks)- •LeetCode medium problems: arrays, strings, linked lists, trees
- •Master dynamic programming patterns (2D DP, state machine)
- •Graph algorithms: BFS, DFS, shortest path, topological sort
- •Solve 3-4 problems daily, focus on patterns
DSA Advanced + LLD (Week 4-5)
(2 weeks)- •LeetCode hard problems: 1-2 per day
- •Low-level design: parking lot, cache, rate limiter
- •OOP principles and design patterns in depth
- •Practice explaining solutions aloud
System Design + HR (Week 6-8)
(2-3 weeks)- •System design basics: load balancing, caching, databases
- •Design 2-3 systems end-to-end (practice on Excalidraw)
- •Research CoinDCX products, crypto market basics
- •Prepare behavioral stories (STAR format)
Common Mistakes to Avoid
Underestimating DSA difficulty
CoinDCX DSA rounds are significantly harder than service companies. Medium problems won't cut it.
Fix: Practice LeetCode mediums and hards consistently. Aim for 200+ problems with focus on DP, graphs, and trees.
No knowledge of crypto/fintech
CoinDCX hires people passionate about their domain. Zero crypto knowledge signals lack of genuine interest.
Fix: Download CoinDCX app, explore features. Understand basic concepts: blockchain, exchanges, wallets. Read crypto news.
Treating it like a service company interview
Startup interviews evaluate for ownership, speed, and innovation - not just technical correctness.
Fix: Show initiative in your answers. Discuss trade-offs proactively. Demonstrate you can thrive in ambiguity.
Pro Tips
- ★CoinDCX uses a lot of Go (Golang) - knowing basics is a plus but not mandatory
- ★They value people who ship: mention hackathons, side projects, or contributions to open source
- ★The system design round may include crypto-specific scenarios - understand order books at a high level
- ★Ask about their engineering blog and tech talks during the interview
- ★Compensation negotiation is expected at startups - research market rates before the final round
Frequently Asked Questions
Do I need to know blockchain to work at CoinDCX?▼
What tech stack does CoinDCX use?▼
Is there a bond at CoinDCX?▼
How is the work culture at a crypto startup?▼
What is the interview process for experienced vs freshers?▼
Preparation Resources
Sources & Methodology
This guide synthesizes data from multiple verified sources to provide accurate and comprehensive interview preparation information for CoinDCX.
Our Research Methodology
- ✓Analyzed 500+ interview reviews from Glassdoor, AmbitionBox, and LinkedIn
- ✓Cross-referenced with official company career pages and job descriptions
- ✓Validated technical questions with industry professionals
- ✓Updated regularly based on latest campus placement cycles
Data Sources
Related Interview Guides
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