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IBM·Software Engineer·Online Assessment (OA)·Junior

JuniorPass
Jul 2026

Summary

Did the IBM HackerRank OA for a software engineer intern role, two questions, one straightforward and one that had me implementing API routes in an IDE environment. Passed and got invited to a competency interview the next day, but had no idea what to expect from that round or what comes after.

Questions Asked (1)

Q1

Implement API routes as part of an IDE-based coding assessment.

API & IntegrationsTechnical Trade-offs
Author's notes

The first question was fine, pretty standard stuff.

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AI HintsAI Generated

Suggested Approach

Start by clarifying the requirements and constraints of the API routes, then outline a clean, modular design that follows RESTful principles and handles edge cases. Implement the routes incrementally, testing each endpoint as you go, and be prepared to explain your design choices and trade-offs.

Pro tip: Write a few test cases or use a tool like Postman to verify your endpoints before declaring completion; this demonstrates thoroughness and catches issues early.

1. Clarify Requirements

Ask questions to understand the expected endpoints, data models, authentication, and error handling. Confirm any assumptions before coding.

2. Design the API

Sketch the route structure, HTTP methods, status codes, and request/response formats. Consider scalability and maintainability.

3. Implement Incrementally

Code one endpoint at a time, starting with the simplest. Use modular code and separate concerns (e.g., routing, business logic, data access).

4. Test and Validate

Write unit tests or use manual testing to verify each endpoint works as expected, including edge cases and error responses.

5. Review and Refactor

Check for code quality, consistency, and adherence to best practices. Be ready to explain any trade-offs made.

Key Points to Mention

  • RESTful design principles and proper use of HTTP methods and status codes
  • Input validation and error handling for robustness
  • Modular code organization and separation of concerns
  • Testing strategies (unit, integration) and tools
  • Performance considerations and scalability
  • Security best practices (e.g., authentication, authorization, input sanitization)

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