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Achievement: YOLOAchievement: Pair ExtraordinaireAchievement: Pull Shark

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Achievement: YOLOAchievement: Pair ExtraordinaireAchievement: Pull Shark

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96528025/README.md

Freja Ren

Backend and distributed systems engineer. M.S. Artificial Intelligence, Northeastern University · Sunnyvale, CA · LinkedIn

I build systems that stay correct under failure — consensus, event-driven pipelines, and the tests that prove they hold.

Selected Work

distributed-kv — Sharded key-value store in Python. One independent replicated-log group per shard built on selected Raft mechanisms, quorum-validated leader reads that reject isolated stale leaders, cross-shard transactions over a failure-free two-phase-commit path, and an opt-in WAL that recovers locally applied state across process crashes. 128 automated checks in CI with live SIGSTOP/SIGKILL failure injection and storage corruption. Python Raft sharding 2PC WAL

MetroRide — Six-service Go ride-dispatch platform separating synchronous intake from asynchronous assignment. Redis Streams consumer groups for horizontally scalable workers, idempotent dispatch with bounded timeouts, three-attempt exponential backoff and dead-letter handling, PostgreSQL as authoritative state. CI/CD publishes SHA-tagged images to GHCR; Helm deploy validated on an ephemeral KinD cluster. Go Redis Streams PostgreSQL Kubernetes Helm

nearby-10min-map — Deployed geospatial web app that turns an address into a map of facilities within an approximate 10-minute drive. A React and TypeScript client renders an equal-area circle derived from a Valhalla drive-time isochrone while FastAPI coordinates OpenStreetMap and Overture enrichment, explicit degraded states, request cancellation, and bounded polling. CI runs 178 offline backend checks, 43 component tests, and mocked Playwright workflows without calling public upstream APIs. React TypeScript FastAPI Leaflet Playwright

Open Source

  • NVIDIA/NemoClaw — PR #378 (merged): installation troubleshooting documentation for Node.js versions, Docker daemon startup, npm permissions, and port conflicts. Closes #364.

Publication

A Comparison of LLM Finetuning Methods & Evaluation Metrics with Travel Chatbot Use Case — arXiv:2408.03562 (2024, published as Angel Ren)

More Projects

Data & ML TeenSafe-EvalOps · ads-ranking-pipeline · amazon-beauty-rec · realtime-clickstream-pipeline · ecommerce-etl-sql-pipeline · ecommerce-analytics-pipeline

Backend & Tooling spring-ai-knowledge-assistant · llm-serving-infra-simulator · smart-job-platform · AdPulse · ad-quality-automation-platform

Applications & Interfaces carebound · hanyue · nearby-10min-map · landingmate · publishsafe · ad-landing-risk-analyzer · freja-ai-os · freja-input · baozi-gesture-game

Pinned Loading

  1. distributed-kv distributed-kv Public

    Sharded Raft KV store in Python — one replicated-log group per shard, quorum-validated leader reads, opt-in WAL crash recovery. 128 CI checks with live SIGSTOP/SIGKILL failure injection.

    Python

  2. MetroRide MetroRide Public

    Go project modeling metro ride workflows and backend service design.

    Go

  3. sf-kart-game sf-kart-game Public

    Browser-based Three.js kart racer with a stable Paris release, a 757.8m SF circuit prototype, and production-code headless validation.

    JavaScript

  4. creditline-decision-lab creditline-decision-lab Public

    Auditable credit-line increase decision prototype combining risk modeling, simulated randomized experiment analysis, and causal policy targeting with leakage checks, frozen design rules, and reprod…

    Jupyter Notebook

  5. landingmate landingmate Public

    Multi-agent arrival assistant for international students, built on one rule: the LLM is never trusted to hold facts, only to organize language. Guardrailed refinement with deterministic fallback.

    Python

  6. nearby-10min-map nearby-10min-map Public

    Explore facilities within an approximate 10-minute drive. React + TypeScript + FastAPI with two-phase POI enrichment and race-safe polling.

    Python