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AT&T·Software Engineer·Onsite - System Design / Architecture·Senior

SeniorPrefer not to say
Jul 2026

Summary

Went into what I thought was a standard system design round with the TL and ended up with the manager crashing the session and basically overriding everything the TL was nodding along to. Left more confused about their team dynamic than anything I got wrong technically.

Questions Asked (1)

Q1

Design a system to meet a set of requirements that kept shifting throughout the interview.

System DesignAdaptability & AmbiguityTechnical Trade-offs
Author's notes

Started fine, clarified scope with the TL, got agreement on everything.

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AI HintsAI Generated

Suggested Approach

Acknowledge that requirements will evolve and propose an iterative design process. Start by clarifying the core problem and constraints, then design a flexible architecture that can accommodate changes. Throughout, explicitly state your assumptions and how you would validate them with stakeholders.

Pro tip: Embrace changes as opportunities to demonstrate adaptability; proactively suggest how the design can evolve, and document trade-offs to show you're thinking about long-term maintainability.

1. Clarify Initial Requirements

Ask questions to understand the core problem, functional and non-functional requirements, and constraints. Identify what is fixed versus what might change.

2. Define Assumptions and Scope

State your assumptions explicitly and agree on a minimal viable scope. This creates a baseline for the design and highlights areas of uncertainty.

3. Design for Flexibility

Propose a modular architecture with clear interfaces and abstractions. Use design patterns that support extensibility, such as microservices, event-driven architecture, or pluggable components.

4. Iterate and Adapt

As requirements change, revisit the design, assess impact, and adjust. Communicate trade-offs and involve stakeholders in prioritization.

5. Validate and Document

Ensure the design meets current requirements and document decisions, assumptions, and potential future changes. Plan for testing and monitoring to validate the design in production.

Key Points to Mention

  • Emphasize iterative development and feedback loops
  • Discuss trade-offs between flexibility and complexity
  • Mention specific design patterns or architectural styles that support change
  • Highlight the importance of communication with stakeholders
  • Show awareness of non-functional requirements like scalability and maintainability
  • Demonstrate ability to prioritize and make decisions under uncertainty

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