I'm a Lead Software Engineer at Sense, where I've spent 5 years building systems that have to stay up: distributed systems handling millions of events, Kafka pipelines, OpenSearch infrastructure, and production AI systems (RAG, retrieval, evaluation loops). I run mock interviews the way a real panel does: an open-ended problem, follow-up questions that push on your weak spots, and honest feedback at the end on what would pass and what wouldn't. No scripted questions, no hand-holding during the round. What I can help with: - System design (HLD): scaling, data modelling, queues, caching, search, failure handling - Low-level design (LLD): class design, APIs, concurrency - Backend deep dives: Kafka, Elasticsearch/OpenSearch, MySQL, Redis, AWS - AI system design: RAG, retrieval pipelines, LLM apps in production Best for: backend engineers with 1–8 years of experience preparing for SDE-2, senior or lead roles at product companies and startups. I also write about systems and AI at rohitsaini.me.