What they can ask from the resume versus Standard CS. Companions: study book 03–05, 08, 10. Job 10454435 still none. UTA Rank A two-DSA generally did not name OS/DB/CN. Still know these cold for an HM or igreaper-style grill. Labels: Resume-derived Standard CS IE-asked.
static belongs to the class. Nested classes can be static. Static blocks run before constructors when the class loads.HashMap average O(1); override equals and hashCode together. Java 8+ treeifies long collision chains.ArrayDeque not Stack. StringBuilder in loops. (a,b) -> b-a overflows — use Integer.compare.Bible §5.F HashMap internals: after a review-word-count DSA (LC 6570344). Kafka / B vs B+ : igreaper OA-as-R1. I did not operate Kafka. Adjacent: Celery + Redis async jobs. B-tree: fat nodes for disk; B+ trees keep values in leaves for range scans — say that as CS, not as “I tuned RDS.”
JWT vs sessions: JWT scales without a session store, revocation is harder. Sessions need Redis once you have two boxes. Ylogx used both RLS and RBAC: RBAC is what the role can do; RLS is which rows the database will return even if the handler is wrong. XSS is script in the page; CSRF is the browser using an existing cookie. Parameterized SQL always — including LLM-generated SQL. CORS is browser-enforced; curl does not care.
Security research hobby (InstaRecon): one sentence — awareness demo, consent, no production attacks — then Ylogx RLS or Argus. No phishing steps.
Convolution: a small kernel slides, dot product, feature map. Parameter sharing and translation equivariance beat a fully connected layer on images. Stride shrinks; padding keeps size; pooling downsamples. Receptive field grows with depth. Batch norm stabilizes training. mAP averages precision across recall and classes; IoU is overlap; NMS drops duplicate boxes. YOLO is one-stage — fast enough for 24 FPS; two-stage is slower and more accurate. 73→89 on 15k images is data and eval, not a captioning LLM.
URL load: DNS → TCP handshake → TLS → HTTP. TCP reliable ordered; UDP not — Horizon GStreamer 60 FPS is the honest UDP-family example (loss vs latency). WebSocket upgrades HTTP to a persistent duplex channel. GoDaddy NS → Route 53 → ALB → ECS tasks. CloudFront caches at the edge.
I did not shard. I did not run EKS as a Ylogx claim. Do not invent an AWS bill or TTL.
Process = address space; threads share it. Deadlock: four Coffman conditions; break one. GIL is Python, not Java. If they ask threads vs processes on Horizon: camera callbacks vs a separate mapping process — keep it honest and short. Banker’s algorithm appeared on GFG sde-1-17 last live — year-out-ish; know the one-liner (avoid unsafe allocation).