The silence mid-presentation is what gets people.
Choose a project where you owned significant technical decisions and can clearly articulate trade-offs. Structure your walkthrough as a narrative: start with the problem and constraints, then your role, architecture, key decisions with alternatives, results, and lessons. Use the slide deck as a visual aid, but keep the focus on your thought process and impact.
Pro tip: Quantify results and explicitly state why you rejected alternatives—this shows engineering maturity. Also, tie lessons learned to how you've improved as an engineer, demonstrating growth.
Briefly describe the project's purpose, the business problem, and any constraints (time, scale, compliance). State your role and the team size to clarify your ownership.
Walk through the system architecture using the diagram. Highlight key components, data flow, and how they interact. Keep it high-level but detailed enough to show you understand the system.
For each major decision, explain the options considered, the trade-offs (e.g., consistency vs. availability, build vs. buy), and why you chose the final approach. Use concrete metrics or constraints to justify.
Present quantifiable outcomes (e.g., latency reduction, cost savings, user growth). Connect them back to the original problem and business goals.
Discuss what you would do differently, what you learned about technology or teamwork, and how it influenced your subsequent work. Be honest about challenges.
AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.
This is the follow-up that bites you if you haven't thought it through.
For each architectural decision, briefly state the context and constraints, then compare the chosen approach with 2-3 alternatives, explaining why the chosen one best satisfied the requirements. Emphasize trade-offs and how you validated the decision, tying it back to Plaid's scale and reliability needs.
Pro tip: Quantify the impact of your decision (e.g., 'reduced latency by 40%') and acknowledge any downsides, showing you understand that architecture is about trade-offs, not perfect solutions.
Briefly describe the system, its requirements, and constraints (e.g., scale, latency, consistency, team expertise) that framed the decision.
Enumerate 2-3 viable alternatives you considered, showing you explored the solution space.
Analyze each alternative against the requirements, highlighting pros and cons in terms of performance, scalability, complexity, cost, and maintainability.
Explain why the chosen approach best met the most critical requirements, referencing specific evidence or metrics.
Share the results (e.g., improved performance, reduced costs) and any lessons learned or adjustments made later.
AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.