Booking.com·Technical Product Manager·Onsite - System Design / Architecture·Senior

Senior

Jun 2026

Summary

TPM interview at Booking.com with a system design component that asked me to literally draw out a system I'd owned. Not a whiteboard-in-the-abstract sense, more like walk me through something real you built.

Questions Asked (1)

Draw the system architecture for a program you owned. Walk through the components, how they interact, and the technical decisions behind the design.

System DesignTechnical Trade-offsCross-functional Alignment

Author's notes

This one tripped me up more than I expected.

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AI HintsAI Generated

Suggested Approach

Choose a system you owned end-to-end and can explain at both high and low levels. Start with a simple whiteboard diagram, then walk through each component, its interactions, and the key technical decisions, linking them to product outcomes and trade-offs. Emphasize cross-functional alignment and how you balanced technical constraints with business goals.

Pro tip: Focus on the 'why' behind each decision, not just the 'what'. Show how you navigated trade-offs with engineering and influenced the architecture to meet product needs, demonstrating technical depth without overstepping into implementation details.

1. Set the context and scope

Briefly describe the product, its users, and the problem it solved. Clarify your role and the system's boundaries to focus the discussion.

2. Draw the high-level architecture

Sketch the main components (e.g., frontend, backend services, databases, third-party integrations) and how they interact. Keep it simple and label data flows.

3. Explain component interactions and data flow

Walk through a typical user journey or request, showing how data moves between components. Highlight any APIs, queues, or caching layers.

4. Discuss key technical decisions and trade-offs

For each major decision (e.g., choice of database, microservices vs monolith, build vs buy), explain the rationale, alternatives considered, and impact on scalability, cost, and user experience.

5. Connect to product outcomes and cross-functional alignment

Summarize how the architecture enabled business goals, and describe how you aligned engineering, design, and other stakeholders throughout the process.

Key Points to Mention

Scalability and performance considerations (e.g., handling peak traffic, latency requirements)
Trade-offs between consistency, availability, and partition tolerance (CAP theorem) or other relevant trade-offs
Build vs buy decisions and vendor evaluation criteria
Cross-functional collaboration: how you worked with engineers, designers, and business stakeholders to make architectural decisions
Monitoring, logging, and failure handling strategies
Evolution of the architecture over time and lessons learned

AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.