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Firmus Consulting Interview Questions

The questions to prepare for Firmus Consulting interviews, across all roles. Questions from real interview reports rank first. Updated daily.

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1
System DesignStart here. 6 questions · ~52 min
Design an LLM Serving PlatformHard

Design an LLM serving system that balances latency, cost, scalability, and safety for production traffic.

Cold StartFeature StoreModel ServingFFirmus Consulting
High-Concurrency LLM ServingHard

Design a low-latency, high-concurrency LLM serving layer with effective prompt, response, and KV-cache strategies.

high-frequency requestsinference latencyml inferenceFFirmus Consulting
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2
Execution3 questions · ~26 min
Balance Delivery and MaintainabilityHard

Explain how you deliver near-term business value while protecting system maintainability and managing stakeholder pressure.

Trade-offsRisk AssessmentScope ManagementFFirmus Consulting
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3
Generative AI & LLMs3 questions · ~26 min
Fine-Tuning vs PromptingHard

Explain when fine-tuning beats advanced prompting and embeddings, considering quality, cost, latency, maintenance, and safety.

Prompt Engineeringmodel fine-tuningmodel comparisonFFirmus Consulting
Designing a RAG PipelineHard

Design and evaluate a secure, grounded RAG pipeline for a Delta Air Lines AI application.

Hallucinationpipeline designPrompt InjectionFFirmus Consulting
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4
Behavioral & Leadership9 questions · ~78 min
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5
More topics4 questions · ~35 min
Cosine Similarity From ScratchMedium
Practice

Compute cosine similarity for equal-length high-dimensional vectors using dot products and Euclidean norms.

function implementationArraysArray ManipulationFFirmus Consulting
Real Time Drift Monitoring DesignMedium

Design a real time monitoring and alerting approach for feature drift, model degradation, and noisy metric movement in production.

CalibrationAUC-ROCThreshold TuningFFirmus Consulting
Embeddings for RecommendationsHard

Design an embedding and vector search pipeline for personalized Amex cardmember recommendations.

Vector SearchMachine LearningWord EmbeddingsFFirmus Consulting
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