Target | Senior Software Engineer

B.Tech - Tier 3 Years of Experience: 6.7 years Current Role: Software Engineer at a Ecomm

Round 1: Screening round Had a call with hiring manager. She asked me about my current project, role and responsibilities, system design related questions.

Round 2: Pair programming Interviewer shared screen and gave me a use case with some corrupted txt file. I had to read this txt file line by line and handle few cases. Later she asked me to optimize the code which was already written. Asked me spring boot related questions, design questions, design patterns

Round 3: Design round(HLD) Design an API for an Order Management System (OMS) used by a retail e-commerce. The system should:

• Accept new orders via REST API
• Persist order data.
• Publish order events to Kafka for downstream consumers (like fulfillment, inventory services) Functional Requirements**

1. Create Order API
   • Accepts customer ID, list of item IDs with quantities and payment mode
   • Validates and persists order in PostgreSQL
   • Publishes order event to Kafka (topic: orders)
2. Get Order Status API
   • Returns current status of the order. Non-Functional Requirements

• Scalability: System should handle spikes in traffic during events (e.g., sales)
• High Availability: APIs should have minimal downtime
• Eventual Consistency: Between PostgreSQL and Redis/Kafka
• Security: Only authorised users can place or view orders
• Performance: Get Order Status should return in <100ms for P99
• Observability: System should be traceable (logs, metrics, alerts)