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Salesforce·Software Engineer·Onsite - System Design / Architecture·Senior

Senior
Jun 2026

Summary

Salesforce solutions architect interview with a platform selection question centered on API-driven app development. Pretty open-ended, which I wasn't fully prepared for.

Questions Asked (1)

Q1

How would you choose a platform for building an application that relies heavily on external APIs?

API & IntegrationsTechnical Trade-offsSystem Design
Author's notes

I went straight into listing platforms and comparing them, which in hindsight was the wrong move.

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AI HintsAI Generated

Suggested Approach

Start by clarifying the application's requirements, especially the types and volumes of external APIs it will consume. Then evaluate platforms based on how well they handle API integration, scalability, and developer experience. Conclude by recommending a platform that best balances trade-offs for the given context.

Pro tip: Emphasize that the choice should be driven by the specific API characteristics (e.g., REST vs. GraphQL, rate limits, authentication) and the team's familiarity, rather than generic platform popularity. Mention that you would prototype critical integrations to validate assumptions early.

1. Clarify Requirements

Identify the number and types of external APIs, expected traffic, latency requirements, and data sensitivity. Also consider team skills and existing infrastructure.

2. Evaluate Integration Capabilities

Assess how easily the platform supports API consumption, including built-in connectors, SDKs, authentication methods, and error handling. Consider support for asynchronous and batch processing.

3. Assess Scalability and Reliability

Examine the platform's ability to handle high throughput, rate limiting, retries, and failover. Look for features like caching, circuit breakers, and monitoring.

4. Consider Developer Experience and Ecosystem

Evaluate the availability of libraries, documentation, community support, and tooling for testing and deployment. A strong ecosystem can accelerate development.

5. Make a Trade-off Decision

Weigh the pros and cons of each option against the requirements, and recommend a platform that aligns best with the project's priorities (e.g., speed vs. control).

Key Points to Mention

  • API characteristics: REST vs. GraphQL, rate limits, authentication (OAuth, API keys), and payload sizes
  • Platform features: built-in API gateways, connectors, serverless functions, and integration platforms (e.g., MuleSoft, Zapier)
  • Scalability: handling concurrent requests, retries, circuit breakers, and caching strategies
  • Developer productivity: SDKs, documentation, testing tools, and local development support
  • Total cost of ownership: licensing, infrastructure, and maintenance overhead
  • Security and compliance: data encryption, audit logs, and adherence to standards like GDPR

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