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etherimirr/README.md

Christina Yijing Jia

Distributed backend systems  ·  LLM agent infrastructure

M.S. Computer Engineering @ Columbia   Dec 2026   B.E. ECE @ UMich–SJTU JI

LinkedIn Email Site

I work on the unglamorous half of systems: the execution layer underneath, the part that has to stay correct when things run concurrently and for a long time.

Right now I'm a SWE intern on TikTok Trust & Safety — Algorithm Infra, on the async execution layer behind a safety-model evaluation platform. I re-architected a synchronous SSE path into MongoDB-backed durable tasks — a 15-minute ceiling became 3-hour jobs — and extended a Go DAG engine with async triggers, which is how I ended up tracking a production concurrency deadlock across parallel SG/US runs.

Interested in

  • Distributed systems & backend infrastructure
  • Low-latency and deterministic execution
  • LLM agent tooling, ML systems

Looking for

  • 2027 New Grad SWE / Infra
  • Summer 2027 internships
  • US-based, open to relocation

Selected work

Project The hard part Stack
⚡ mbook Deterministic limit order book. O(1) dense tick ladder over a preallocated slab, nothing allocated on the hot path, replay verified by a digest over the ordered fill stream. C++17 CMake
🔒 An-agent (private) Multi-agent assistant on the Claude Code SDK. Five-layer memory (procedural → working → episodic → semantic → persona), and a read-only digital twin with three-layer prompt-injection defense. Python SQLite/FTS5 ChromaDB
🧭 cs-interview-coach Local-first, sub-millisecond FST search over 140+ knowledge cards, with FSRS spaced repetition across five navigation views. Rust Tauri SvelteKit
📮 gmail-digest Rules-first triage across several inboxes. The optional LLM pass must quote the email for every judgment it makes — no unsourced verdicts. Python Discord API
🎬 xhs-bilibili-distill One distillation pipeline, two source adapters: transcript + scene-detected key frames + structured report. Python FFmpeg
📊 portfolio-insights-generator Transaction analytics with LLM-assisted insight generation and what-if scenario modeling. Python Streamlit pandas

Stack

Languages  Go Python C++ Rust TypeScript Java

Distributed & backend  gRPC Kafka Kubernetes Docker AWS MongoDB PostgreSQL Redis

ML systems  PyTorch CUDA TensorRT FAISS Anthropic

Popular repositories Loading

  1. mbook mbook Public

    Deterministic O(1) limit order book in C++17 — dense tick ladder, intrusive per-price queues over a preallocated slab, no hot-path allocation, replay-verified determinism.

    C++ 1

  2. project project Public

    Python

  3. mimas-room-fan-timeline mimas-room-fan-timeline Public

    Interactive timeline visualization built with vanilla JavaScript.

    JavaScript

  4. pinyin-communication-badge-asd pinyin-communication-badge-asd Public

    Pinyin communication badge — assistive AAC prototype for non-verbal communication.

    Python

  5. fitmaster fitmaster Public

    Single-file, offline, zero-dependency fitness app with AI coach (Claude/GPT vision), scientific dynamic calorie engine, 100+ exercises, bilingual EN/中文

    HTML

  6. portfolio-insights-generator portfolio-insights-generator Public

    Streamlit dashboard for transaction CSV analytics with LLM-assisted insights and what-if scenarios.

    Python