Morgan Li.

Backend architecture, deploy pipeline and platform reliability across a 7-stack CDK monorepo (Network, Data, WAF, Compute, Monitoring×2, ECR).

Aurora Serverless v2 with passwordless IAM DB auth, ElastiCache Valkey, ECS Fargate on ARM64, CloudFront VPC Origin, WAFv2. Authored 16+ ADRs and the cutover runbook.

Set up the React / Vite frontend foundation — architecture, build tooling, and shared conventions — and mentor the frontend engineers building the web app.

4-crate Cargo workspace — affected-bbox streaming OSC parser, PBF node-coord index, greedy bbox merge with haversine distance.

From-scratch Go implementation of the PMTiles v3 binary format for incremental tile splicing from Geofabrik diffs.

Per-user session registry across multiple ECS task replicas. Redis Streams consumer-group fan-out with wake-ack synchronization.

DDoS guards (connection caps, 5 msg/s rate limit with burst, size + idle limits) backed by a shared-aggregator test infra running 475+ websocket tests in ~110s on pytest-xdist.

Secrets Manager-driven preserve-on-update semantics and per-purpose rotation GitHub Actions workflows.

Add-new-kid → flip → drain refresh window → drop old kid, without forcing a global re-login.

Open-source Claude Code plugin (MIT, published to the marketplace) automating the CS / ML / NLP research workflow as five model-invoked agent-skills: literature search + clustering, single-paper digests, experiment design, experiment-code scaffolding, and paired-statistics analysis.

Designed the skill trigger + structured-output surface; integrates Semantic Scholar, arXiv (full API conformance), and OpenAlex; fixture-based offline tests, .env key management, scipy / numpy statistical core.

Python / FastAPI with async SQLAlchemy + Alembic. Postgres with pgvector + pg_trgm for vector + trigram search. arq + Redis ingest workers. Anthropic SDK (Sonnet / Haiku / Opus tiered) for parsing and enrichment.

Vite + React + TS + Tailwind + TanStack Query frontend with SSE streaming feed. Pragmatic pull-only architecture with lazy verification on read; docker-compose dev stack.

Investigate logical negation pattern in the self-attention mechanism. Apply quantum-logic-inspired orthogonal separation to vector space in transformer models.

Open questions: does orthogonal separation improve sarcasm detection? Does it carry over to general downstream tasks?

Used JetBrains Profiler to identify performance bottlenecks with a data-driven approach.

Used Cecil to inject code snippets into assembly and Harmony to patch code on the fly to improve runtime performance.

Awesome Inventory — open-source C# extension to a RimWorld inventory mod (224 of 267 commits, 200K+ unique downloads).

Three-tier pub-sub event mesh designed to avoid races; Schmitt-trigger hysteresis on inventory margins to prevent restock oscillation; sentinel-job + Harmony-prefix pattern bridging a structural gap in the vanilla game’s job-interrupt notifications.

MoveBase — open-source C# / .NET mod for RimWorld. Multi-building relocation modeled as cycle detection on a lazily-constructed dependency graph (spatial + interaction-cell constraints).

Cycles broken by a feedback-vertex heuristic that demotes one chain node to non-relocating uninstall. Operation state is save-game serializable across ticks. Harmony patches bridge the closed-source engine.