Sirui Chen·sirui.dev
Available for full-stack roles · Green Card

Hi, I’m Sirui Chen.

Full-stack engineer building backend systems, cloud infrastructure, distributed systems, and AI/NLP applications.

University of Pennsylvania CIS M.S.E. candidate (May 2026) with a B.S. in Computer Science and a second major in Mathematical Science from Washington University in St. Louis (CS GPA 3.98/4.00). I build React web apps, backend APIs, PostgreSQL data systems, distributed search infrastructure, OS components, and ML/NLP research pipelines. I care about readable code, product workflows, scalable systems, and cross-functional execution.

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GitHubLinkedInPhiladelphia, PA

Projects

Featured work

Selected projects that show full-stack range across product, distributed systems, OS internals, and applied ML.

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sirui.dev — Full-Stack Portfolio on AWS EC2
Production-style portfolio deployed on a self-managed AWS EC2 box.

A typed Next.js portfolio shipped end-to-end: app, Nginx reverse proxy, PM2 process manager, Let's Encrypt HTTPS, and a GitHub Actions deploy pipeline running on Ubuntu EC2.

Next.js 16React 19TypeScript (strict)Tailwind CSS 4shadcn/uiAWS EC2 (Ubuntu)+4
Read more →Demo
SafeCommerce-LA
Full-stack analytics for LA crime data and California retail sales.

Authenticated dashboards, maps, charts, filters, and CSV export over a PostgreSQL schema that joins LA crime data with California retail sales records. Graded 99/100.

ReactPythonPostgreSQLJWTSQL OptimizationREST APIs
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Distributed Web Search Engine
Crawler, indexer, PageRank, KVS, and RDD-like Flame layer in Java.

End-to-end distributed search platform with a custom crawler, indexer, PageRank, replicated key-value store, multithreaded web server, and an RDD-style compute layer named Flame.

JavaConcurrencyNetworkingDistributed SystemsCustom KVSRDD-style Compute
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PennOS — A Unix-Like Educational OS
Shell, scheduler, signals, and a FAT-style filesystem written in C.

C implementation of Unix-like OS features: shell commands, process scheduling, signal handling, and a PennFAT filesystem with full error-path testing.

COperating SystemsShellsSchedulingSignalsFilesystems
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Skills

What I work with

Grouped by where they show up in my day-to-day.

Languages

JavaScriptTypeScriptPythonJavaC/C++SQLShell

Frontend & Product

ReactNext.jsTailwind CSSUI workflowsStructured formsInput validationAPI integrationProduct debugging

Backend & Data

Node.jsExpressTornadoREST APIsPostgreSQLMySQLSnowflakeETLDashboardsQuery optimization

Cloud & Systems

AWSAWS CDKEC2DockerNginxPM2Distributed systemsConcurrencyNetworkingOperating systemsROS

Engineering Quality

TestingDebuggingPerformance checksDocumentationMaintainable codeReproducible scripts

Experience

Recent roles

Full timeline →

  1. Research Assistant — Prof. Chris Callison-Burch·University of Pennsylvania

    May 2025 – Aug 2025

    Built and evaluated retrieval-augmented generation workflows for DARPA SciFy and OpenScholar using score-based filtering, contrastive model work, and domain data preparation.

  2. Python Developer Intern·CambioML

    Dec 2023 – Mar 2024

    Built an LLM-powered data portal with Danswer AI to search datasets from AWS, Datarade, and Snowflake across ingestion, indexing, and user-facing discovery workflows.

  3. Lab Assistant — Vision-Assisted Self-Driving F1Tenth Car·Washington University in St. Louis

    Aug 2023 – May 2024

    Improved model robustness in glare and shadow conditions through targeted data augmentation, experiment tracking, and evaluation.

Research

Selected research

All research →

University of Pennsylvania · May 2025 – Aug 2025

Retrieval-Augmented Generation for DARPA SciFy and OpenScholar

Designed and evaluated retrieval-augmented generation workflows for scientific question answering on DARPA SciFy and OpenScholar, with a focus on retriever ranking quality and reproducible evaluation.

Washington University in St. Louis · Aug 2023 – May 2024

Vision-Assisted Self-Driving F1Tenth Car

Improved perception robustness for a 1/10-scale autonomous racing car under glare and shadow, and integrated new sensor input through ROS.

Looking for a full-stack engineer?

I’m available for full-time roles starting after May 2026. The fastest way to reach me is email.

Email siruichen2023@outlook.comView resume