What questions are asked in Johnson & Johnson Backend Engineer interviews?

Recent candidates report role-specific technical depth, system design or case prompts, and behavioral STAR questions. "Find the longest substring without repeating characters…" is among frequently reported topics.

Is domain-specific tech mandatory for Johnson & Johnson Backend 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 Johnson & Johnson Backend 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 Johnson & Johnson Backend 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 Johnson & Johnson?

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

Back to Johnson & Johnson Backend Engineer interview

Interview question

Find the longest substring without repeating characters

Asked in Johnson & Johnson Backend Engineer interviews

Asked by

31% candidates

Difficulty

Medium

Round

Technical Round

AI synthesized from candidate reports

Back to Questions

Question 3 of 5

Find the longest substring without repeating characters

Medium59% Candidate ReportsCODINGJohnson & JohnsonBackend Engineer

Question

Find the longest substring without repeating characters

High-Level Approach

Two pointers + map; update start when duplicate seen.