General Tech Interview Questions (May 2026)
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LLD Java Concurrency: Design Cancelled Task Tracker for ExecutorService
Interview Experience
Question You have an
ExecutorService that runs tasks. When you call shutdownNow(), it returns a list of tasks that were never started. But what about the tasks that were already running and got interrupted mid‑execution? Those are gone – no trace, no list. How can you reliably track which tasks were cancelled (interrupted) during an abrupt shutdown, so you can later re‑process them? ---
Key Concepts - shutdown() vs shutdownNow() shutdown(): graceful – no new tasks, but running tasks continue. shutdownNow(): abrupt – tries to interrupt running tasks and returns pending tasks. - Thread interruption Running tasks that respect interruption may throw InterruptedException or check Thread.interrupted(). shutdownNow() sets the interrupt flag on all worker threads. - Tracking in‑flight cancellations You need to know which tasks were interrupted after they started but before they completed. - Wrapper pattern Decorate an ExecutorService to add tracking logic without changing the underlying executor. ---
Solution 1. Create a wrapper class that holds a reference to a real ExecutorService and a thread‑safe set (e.g., ConcurrentHashMap.newKeySet()) for cancelled tasks. 2. Override execute(Runnable r) Submit a wrapper Runnable to the real executor. Inside that wrapper: Call r.run() inside a try block. In a finally block, check if the executor is shutting down (isShutdown()) and the current thread is interrupted (Thread.currentThread().isInterrupted()). If both are true, add the original task to the cancelled set.
public void execute(final Runnable runnable) { exec.execute(() -> { try { runnable.run(); } finally { if (isShutdown() && Thread.currentThread().isInterrupted()) tasksCancelledAtShutdown.add(runnable); } }); }
Topics
General Tech Interview Process Overview
The General Tech interview process typically includes a recruiter screen, one to two technical phone screens, and a 4-6 round on-site or virtual on-site loop. Each round serves a distinct calibration purpose: coding rounds measure correctness, code quality, and complexity reasoning; system design rounds measure architectural judgment at the appropriate level; behavioral rounds measure ownership, leadership scope, and collaboration. Reports tagged on LeakCode from 2024-2026 show General Tech runs a calibrated process consistent with industry norms for companies of its tier.
Difficulty calibration: General Tech coding rounds typically run medium difficulty with follow-up depth as the senior discriminator. System design rounds expect production-grade trade-off articulation at L4+ levels. Behavioral rounds expect quantified outcomes ("reduced p99 latency from 800ms to 120ms") rather than vague impact claims. The candidates who advance consistently demonstrate clear thinking out loud rather than perfect final answers.
How To Use General Tech Question Reports
Real candidate-reported interview questions are a calibration tool, not a memorization target. General Tech updates its question pool every 2-4 months; memorizing exact problems risks misleading you when the interviewer uses a variant. The high-leverage approach: identify the patterns that appear repeatedly in General Tech reports, practice those patterns on similar (not identical) problems, and use the reports to understand the interviewer's typical follow-up depth.
Filter the questions above by round type, difficulty, and recency. Focus first on reports from the past 6-12 months; older reports may reference questions that have since rotated out of General Tech's pool. Reports tagged with quantified difficulty and explicit round type are higher-signal than reports without those tags. The metadata filters help you build a focused study plan in 1-2 hours rather than 8-10 hours of unstructured browsing.
Common General Tech Interview Mistakes
Reports tagged "no hire" at General Tech consistently surface a few patterns: jumping into code without clarifying requirements, coding silently for extended periods, missing edge cases (empty input, single element, large input, overflow), producing working code the candidate cannot refactor when probed, and behavioral stories that use "we" instead of "I" diluting individual signal. Strong candidates explicitly avoid these patterns by following a consistent round template.
The single most predictive failure mode in recent reports: not asking clarifying questions. Interviewers are explicitly trained to weight this dimension. Strong candidates ask 3-5 clarifying questions even on problems that look obvious; weak candidates dive into implementation immediately. Strong candidates also verbalize their approach before writing code; weak candidates code in silence and lose the communication dimension of the round's calibration.