Design a Payment for Oracle
Last updated: September 28, 2025
Quick Overview
Design a real-time payment system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Oracle
September 28, 2025102
10
3,848 solved
Design a real-time payment system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
This is a common system design question asked during Technical Screen at Oracle. The interviewer expects you to demonstrate your ability to design large-scale distributed systems, make well-reasoned trade-offs, and communicate your thought process clearly. Oracle values engineers who can think about scalability from day one.
What the Interviewer Expects
- Systematically gather requirements and estimate capacity (QPS, storage, bandwidth)
- Design a scalable architecture with clear component responsibilities
- Make well-reasoned database and caching decisions with trade-off analysis
- Address consistency vs availability trade-offs specific to the use case
- Discuss partitioning strategy, replication, and data modeling
- Cover failure handling, monitoring, and alerting strategies
Key Topics to Cover
How to Approach This
- Start by clarifying functional and non-functional requirements with the interviewer.
- Estimate the scale: QPS, storage, bandwidth. This drives your design decisions.
- Draw a high-level architecture first, then deep dive into 1-2 critical components.
- Discuss trade-offs explicitly (e.g., consistency vs availability, SQL vs NoSQL).
- Address failure scenarios, monitoring, and how the system handles 10x traffic spikes.
Possible Follow-up Questions
- How would you handle a region-wide outage?
- What would the deployment pipeline look like for this system?
- How would you handle a 10x increase in traffic overnight?
- How do you ensure data consistency across multiple services?
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Requirements
Functional Requirements
- Real-time Payment Processing: Handle payment transactions instantly with a response time of under 2 seconds.
- Multi-Currency Support: Process payments in vario...
Capacity Estimation
To estimate the capacity, we consider the following:
- Daily Transactions: 10 million transactions per day.
- Transactions Per Second (TPS): 10 million / 86,400 seconds ≈ 115.74 TPS.
- **Peak ...
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