From-scratch type-safe ORM over SQLite and Postgres: query builder, migrations, eager loading, unit of work, and a multi-tenant catalog with closure-table hierarchies, integer money, and soft delete.

From-scratch Raft consensus in Go: leader election, log replication, and crash-safe persistent term, vote, and log

Embedded LSM-style key-value storage engine in Rust: memtable, WAL with LSN chaining, SSTables, compaction, and crash recovery.

Incident triage on Cloudflare: Llama 3.3 on Workers AI, a Durable Object per conversation, and a Workflow for durable multi-step investigations.

Polyglot order-processing mesh: W3C traceparent across HTTP and broker envelopes, structured JSON logs, liveness vs readiness, NATS, Compose, Go gateway, TypeScript services, Python worker.

Activity feed modeled across Postgres, MongoDB, Redis, Cassandra, CockroachDB, and Neo4j. One ActivityStore port, PACELC when-to-use guide, and percentile benches per query shape.

Turbo + pnpm monorepo for LLM agents: typed workspace DAG, SSE streaming, rate limits, Redis, OpenTelemetry, Compose vs Helm

From-scratch TypeScript message broker: topic pub/sub, competing-consumer work queues, consumer lag, sliding-window throughput, and delivery guarantees behind Kafka, RabbitMQ, and SQS.

Use your iPhone as a low-latency OBS camera source over your LAN. No app, no fee.

Classification yard for CI failures: Kafka ingest, Temporal investigations, LLM briefs, Bazel across Go/Python/TypeScript, Kubernetes.

Profile README — bespoke animated banner + self-updating latest writing.

Machine learning and deep learning from scratch in numpy: autograd, backprop, optimizers, and a tiny char-level GPT.

Ephemeral zero-credential sandbox for untrusted and agent-written code: isolates, resource limits, verified post-conditions, threat tests.

Shopify Hydrogen storefront with a cat-vs-dog rivalry: two product tribes and an order-driven scoreboard that reshapes the homepage each week

Nuxt 3 SSR ecommerce store for home office furniture, with product variants, PayPal/Square/Amazon Pay, Klaviyo, Meta Pixel, and an admin console

Modern front-end lab in Next.js 15 + React 19: Server Components, streaming, Server Actions, forms, virtualization, design tokens, and Core Web Vitals.

My NeetCode.io problem submissions

Render the exact board position at any percentage of a real chess.com game, as a recurring cameo for a system-design video series

AES block cipher (128/192/256-bit) built from scratch in Java, following the NIST FIPS-197 spec with per-round state tracing

Cheating Hangman in Java that keeps every possible word alive and always picks the largest surviving set to stall the player

Norvig-style spelling corrector in Java: a trie dictionary plus edit-distance search over the four single-character edits

OS345 teaching kernel in C: shell, preemptive scheduler, semaphores, virtual memory paging, and a FAT-12 file system

Full-stack family tree app: Java HttpServer with a SQLite DAO backend and an Android client plotting generated family events on Google Maps