Company interview vault

Arm Mid-level (3–5 years) Coding / DSA

#1516

How do you find median of two sorted arrays in log time? — Arm interview

Reported in Arm European engineering loops. Hard interview classic requiring binary search partition logic.

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Arm Mid-level (3–5 years) Coding / DSA

#1517

When would you use a Trie for prefix search? — Arm interview

Reported in Arm European engineering loops. Data structure trade-off question for autocomplete and dictionary lookups.

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Arm Mid-level (3–5 years) Coding / DSA

#1518

Explain minimum window substring sliding window approach — Arm interview

Reported in Arm European engineering loops. Advanced string window question seen in strong coding interviews.

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Arm Mid-level (3–5 years) Coding / DSA

#1519

How do you perform topological sort on a directed acyclic graph? — Arm interview

Reported in Arm European engineering loops. Graph algorithm for task scheduling, build systems, and course prerequisites.

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Arm Mid-level (3–5 years) Technical deep dive

#1520

What is dependency injection and why is it useful? — Arm interview

Reported in Arm European engineering loops. Java/Spring staple connecting OOP design to testable service architecture.

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Arm Mid-level (3–5 years) Technical deep dive

#1521

How do you version a public API without breaking clients? — Arm interview

Reported in Arm European engineering loops. API evolution question covering compatibility, deprecation, and communication.

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Arm Mid-level (3–5 years) Behavioral

#1522

Tell me about a project that failed or missed its deadline. What did you learn? — Arm interview

Reported in Arm European engineering loops. Behavioral question testing accountability, retrospectives, and growth.

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Arm Mid-level (3–5 years) Technical deep dive

#1523

Compare ACID and BASE consistency models in databases — Arm interview

Reported in Arm European engineering loops. Distributed data question bridging SQL transactions and NoSQL eventual consistency.

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Arm Mid-level (3–5 years) Technical deep dive

#1524

How does Node.js handle concurrent requests with a single thread? — Arm interview

Reported in Arm European engineering loops. Node.js architecture question on libuv, event loop phases, and worker threads.

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Arm Mid-level (3–5 years) Technical deep dive

#1525

When would you use useState versus useReducer in React? — Arm interview

Reported in Arm European engineering loops. React hooks question on local state complexity and predictable updates.

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Arm Mid-level (3–5 years) Technical deep dive

#1526

What is the Python GIL and how does it affect concurrency? — Arm interview

Reported in Arm European engineering loops. Python-specific question on threading limits and multiprocessing alternatives.

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Arm Mid-level (3–5 years) Technical deep dive

#1527

Explain the JavaScript event loop, call stack, and task queues — Arm interview

Reported in Arm European engineering loops. Core JavaScript concurrency model question for frontend and Node.js roles.

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Arm Mid-level (3–5 years) Technical deep dive

#1528

How does HashMap work internally in Java? — Arm interview

Reported in Arm European engineering loops. Java-specific collections question on buckets, hashing, and resize behavior.

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Arm Mid-level (3–5 years) Technical deep dive

#1529

What is the difference between unit and integration tests? — Arm interview

Reported in Arm European engineering loops. Testing strategy question covering pyramid, mocks, and confidence vs speed.

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Arm Mid-level (3–5 years) Technical deep dive

#1530

Explain CI/CD and what a typical pipeline includes — Arm interview

Reported in Arm European engineering loops. DevOps fundamentals for mid-level engineers discussing automation and quality gates.

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