X Development Backend Engineer Interview Questions

The questions to prepare for a X Development Backend Engineer interview. Questions from real interview reports rank first. Updated daily.

14questions

~2htotal time

Track your progressSign up free to work through all 14 questions and resume where you left off.

ExecutionStart here. 6 questions · ~48 min

Explain how you prioritize technical debt versus feature work while aligning stakeholders and protecting delivery speed.

Debug Non-Deterministic Production IssuesHard

Create a controlled execution plan to isolate, mitigate, and permanently resolve an intermittent production failure.

alertingproduction issuesDebugging

X Development

Optimize Slow Services and QueriesHard

Explain how you would diagnose, prioritize, and safely optimize a slow-running service or query.

cost optimizationalertingperformance optimization

X Development

More Execution questions with a free account

System Design3 questions · ~24 min

Design fault-tolerant microservices for X Development's ML serving stack, covering isolation, graceful degradation, retries, and observability.

Structure APIs and ModelsHard

Design clear endpoints and data models for a new ML-oriented API at X Development.

api designdesignModel Serving

X Development

Design for Traffic SpikesHard

Design a highly available ML-backed service that remains responsive during massive traffic spikes.

distributed systemsscalabilityhigh availability

X Development

Create a free account to unlock this list and practice real interview questions.

Behavioral & Leadership4 questions · ~32 min

Explaining Technical Complexity SimplyMedium

Tests technical communication and stakeholder influence: can you translate complexity into clear business decisions for non-technical audiences?

Stakeholder ManagementCommunicationtechnical experience

X Development

More Behavioral & Leadership questions with a free account