Yufei (Eric) Guo

End-to-End Custom LLM Application

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Singapore, Singapore

Experience

Jul 2025 - Oct 2025
4 months

End-to-End Custom LLM Application

G.A.I.A. (Game AI Assistant)

  • Engineered a vertical domain LLM application locally, orchestrating the full lifecycle from synthetic data generation and QLoRA fine-tuning (Qwen 1.8B) to GGUF quantization and deployment via Ollama.
  • Designed a robust retrieval system using LangChain and ChromaDB, applying advanced prompt engineering strategies (e.g., Chain-of-Thought, Few-Shot Prompting) to align the small model's reasoning capabilities and significantly reduce hallucinations in domain-specific tasks.
  • Developed a production-ready frontend using Chainlit, featuring real-time token streaming and visualization of the reasoning process (CoT) to enhance user interaction and system transparency.
Dec 2024 - Jun 2025
7 months
Singapore

Quality Assurance Engineer (Web, iOS, Android, Java Backend)

Binance

  • Conducted deep-dive debugging by tracing distributed logs and verifying data consistency across MySQL and Redis, ensuring that complex transaction states (e.g., Pending vs. Locked) were accurately synchronized.
  • Expanded the Java-based automation suite (TestNG) by engineering robust test scripts for 20+ new payment microservices, increasing regression coverage by 30% for critical financial flows.
  • Managed daily release trains via Jenkins, orchestrating canary deployments that routed live traffic to 100,000+ users per rollout, ensuring zero downtime during high-traffic windows.
  • Validated end-to-end crypto-fiat settlement logic, rigorously testing edge cases such as network timeouts, double-spending prevention, and idempotency to guarantee 100% financial accuracy.
Mar 2024 - Dec 2024
10 months
Singapore

Full-Stack Developer (Python, AWS)

Starstruck Pte Ltd

  • Engineered high-concurrency web crawlers (Python/Selenium) capable of traversing 300+ global marketplaces, successfully processing over 120,000 data points daily with 99.9% uptime.
  • Directed the creation of data workflows for 120,000+ records across 2,000+ companies, deploying automated validation and testing pipelines on AWS Lambda and EC2, achieving 40% higher accuracy in data handling.
  • Established cloud infrastructure workflows for seamless data orchestration from S3 to DynamoDB, and implemented Spark ETL pipelines to optimize Big Data workflows, which lowered system latency by 20%.
Aug 2022 - May 2023
10 months
United States

Backend Developer (Java)

Trending Lines

  • Deployed scalable backend architecture with Spring Cloud and Docker, enabling multi-user access and consistent multi-node deployments.
  • Optimized data retrieval by 30% and responsiveness by 50% through Elasticsearch tuning, Redis caching, and distributed query enhancements.
  • Implemented real-time processing with KafkaStream for timely notifications and data computation, improving overall user experience.

Summary

A results-oriented software engineer with a Master's in Computer Science and hands-on experience in the end-to-end development of LLM applications. Proven ability to build, fine-tune, and evaluate custom AI solutions on cloud platforms like Vertex AI. Seeking to leverage strong backend engineering skills to create scalable and reliable AI-powered products.

Skills

  • Python
  • Java
  • C++
  • Javascript
  • Angular
  • Node.js
  • Selenium
  • Testng
  • Junit
  • Spring Boot
  • Elasticsearch
  • Redis
  • Kafka
  • Aws
  • Gcp
  • Ci/cd (Jenkins, Github, Nexus)
  • Docker
  • Restful
  • Microservices
  • Mysql
  • Mongodb
  • Hadoop
  • Spark
  • Hive
  • Agile
  • Linux
  • Shell Scripting
  • Postgres
  • Llm
  • Generative Ai
  • Rag
  • Fine-tuning
  • Vertex
  • Langchain
  • Chromedb

Languages

Chinese
Native
English
Advanced

Education

Jan 2024 - Jun 2025

Singapore Management University

MSc in Management · Management · Singapore · 4.00/4.0

Aug 2021 - Jul 2023

University of Southern California

M.S in Computer Science · Computer Science · Los Angeles, United States · 3.77/4.0

Sep 2019 - Jul 2021

University of California Irvine

B.S in Computer Science · Computer Science · Irvine, United States · 3.89/4.0

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