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kejian-tong/README.md

Kejian Tong

Software Engineer | Agentic AI | LLM Systems | Distributed Platforms

Building production-ready AI products with retrieval, tool use, orchestration, and scalable backend infrastructure.

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Applied AI Engineer LLM Engineer AI Platform Engineer Backend Engineer

Agentic AI RAG MCP OpenAI API LangChain Prompt Engineering LLM Fine-tuning NLP

About Me

I hold an M.S. in Computer Science from Northeastern University and work at the intersection of applied AI, LLM systems, and distributed engineering.

My focus is building reliable, scalable systems that turn AI research and prototypes into production-ready products with clear engineering impact.

What I Build

  • Agentic AI workflows that combine tool use, retrieval, orchestration, and external APIs to solve real tasks
  • LLM applications built with RAG, fine-tuning, prompt engineering, OpenAI API integrations, LangChain, and NLP
  • Scalable backend and platform systems that support production-grade AI experiences on cloud-native infrastructure

Engineering Strengths

  • Comfortable moving across model integration, backend services, data pipelines, and infrastructure
  • Strong focus on reliability, latency, maintainability, and developer velocity
  • Best fit for Applied AI Engineer, LLM Engineer, AI Platform Engineer, and backend roles for AI products

Research and Profiles

Tech Stack

  • Languages: Java, TypeScript/JavaScript, Python, Go
  • AI and LLM: Agentic AI, LLM Fine-tuning, RAG, Prompt Engineering, MCP, LangChain, OpenAI API, NLP
  • Frameworks: Spring Boot, Node.js, React
  • Data and Messaging: Kafka, Redis, RabbitMQ
  • Infrastructure: Docker, Kubernetes, Terraform
  • Cloud: AWS, Google Cloud, Azure
  • Databases: MySQL, PostgreSQL, MongoDB, DynamoDB, Azure Cosmos DB

GitHub Activity

GitHub Stats Top Languages

Contribution Snake

Collaboration

Open to conversations around applied AI engineering, LLM systems, agentic workflows, distributed systems, and research-driven product development.

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  1. DistributedSystemDatingApp DistributedSystemDatingApp Public

    Java 4

  2. New-Grad-Positions New-Grad-Positions Public

    Forked from SimplifyJobs/New-Grad-Positions

    A collection of New Grad full time roles in SWE, Quant, and PM.

  3. hello-algo hello-algo Public

    Forked from krahets/hello-algo

    《Hello 算法》:动画图解、一键运行的数据结构与算法教程。支持 Python, Java, C++, C, C#, JS, Go, Swift, Rust, Ruby, Kotlin, TS, Dart 代码。简体版和繁体版同步更新,English version ongoing

    Java

  4. ML-course ML-course Public

    Forked from ML-course/master

    A machine learning course using Python, Jupyter Notebooks, and OpenML

    Jupyter Notebook 1

  5. kejian-tong.github.io kejian-tong.github.io Public

    Personal website

    TypeScript