What questions are asked in UnitedHealth Group Data Engineer interviews?

Recent candidates report role-specific technical depth, system design or case prompts, and behavioral STAR questions. "Optimize Spark job with data skew on a large join…" is among frequently reported topics.

Is domain-specific tech mandatory for UnitedHealth Group Data Engineer?

Strong fundamentals are required; stack depth signals vary by team. Panels often probe production scenarios even when the JD lists it as preferred.

How many rounds are there in UnitedHealth Group Data Engineer interviews?

Most loops include 3–5 rounds: recruiter screen, technical depth, system or domain panel, and behavioral/hiring-manager. Timelines often run 3–6 weeks.

How difficult is the UnitedHealth Group Data Engineer interview?

Difficulty is Medium–High. Candidates who practice real questions with AI mocks and follow-up chains outperform passive reading.

What SQL and data topics are asked at UnitedHealth Group?

Data-heavy tracks report warehousing, ETL, optimization, and modeling questions. Match prep to your specialization and recent candidate reports.

How do I answer "Optimize Spark job with data skew on a large join…" in a UnitedHealth Group panel?

Structure with constraints, approach, trade-offs, and metrics. Use the simulator's mock mode for UnitedHealth Group-style follow-ups and readiness tracking.

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Interview question

Optimize Spark job with data skew on a large join

Asked in UnitedHealth Group Data Engineer interviews

Asked by

51% candidates

Difficulty

Medium

Round

Technical Round

AI synthesized from candidate reports

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Question 1 of 5

Optimize Spark job with data skew on a large join

Medium59% Candidate ReportsTECHNICALUnitedHealth GroupData Engineer

Question

Optimize Spark job with data skew on a large join

High-Level Approach

Start with object lifecycle, then GC phases, then metrics you watch (heap, GC pause, allocation rate).