Hiroshi OS

Distributed in-memory cache: consistent hashing, TTL, LRU, replication — systems-design demo

Signed, retried webhook delivery with DLQ (Go + Postgres)

LSM storage engine: memtable, WAL, SSTables, bloom, compaction — systems demo

Idempotent payments API on a double-entry ledger (Go + Postgres)

From-scratch Raft KV: elections, AppendEntries, quorum commit — systems demo

Mini-Kafka clone: segmented commit log, consumer groups, ISR/HWM — systems demo

Cited go/no-go eligibility, compliance matrix, risks and pre-bid queries for Indian government tender packs. Multi-agent RAG (FastAPI, LangGraph, hybrid retrieval) with a first-class eval harness.

Tender intelligence for MSMEs: crawlers for public Indian government tenders (CPPP, GeM, state portals), Python ETL into PostgreSQL, Django alerts and dashboards.

Wattpad-style storytelling: web + Kotlin Android + API — Hello Interview system design

Staging→prod release gate: health checks, approvals, audit trail — no AI