B i l l C h e n g

My Expertise

What I Offer

Frontend Development

Frontend Development

Building responsive, user-centric interfaces using modern frameworks and libraries.

  • ReactJS, Redux
  • Java, JavaScript (ES6+), TypeScript,
  • Angular, Bootstrap, jQuery
Frontend Development
Backend Development

Backend Development

Developing secure, scalable, and high-performing backend services with API integration.

  • Node.js, Express.js, NestJS
  • REST APIs & WebSockets
  • Databases: PostgreSQL, MongoDB, MySQL, JDBC
Backend Development
Cloud & DevOps

Cloud & DevOps

Deploying applications on cloud platforms with modern CI/CD practices.

  • AWS (EC2, S3, Lambda)
  • Docker, Jenkins, GitHub Actions
  • Netlify & Vercel Deployments, CI/CD Pipelines
Cloud & DevOps

About Me

Welcome to My Portfolio

Hi there, I’m Bill Cheng, a passionate Full Stack Java Developer with 3+ years of experience designing, developing, and deploying scalable enterprise and financial applications. Proficient in Java, Spring Boot, React, Node.js, and AWS Cloud Services, with a strong background in microservices, RESTful APIs, and CI/CD pipelines. Skilled in translating business requirements into robust software solutions that enhance performance, maintainability, and user experience.

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My Skills

Technical Skills

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ReactJS

95%

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NodeJS

90%

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TypeScript

85%

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SQL

80%

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Python

75%

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Docker

85%

Backend Development

Microservices Architecture

Cloud Computing

Enterprise Integration

Agile & DevOps

CI/CD Pipelines

System Design

API Development

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Introduce the story of my Educational and Career Journey

  • Aug 2024 – Dec 2024
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    Software Engineer

    ATR International – Palo Alto, CA

    Developed React-based financial dashboards with real-time data visualization and advanced filtering. Built and optimized Spring Boot microservices and RESTful APIs for payment processing and account management. Enhanced database performance using Hibernate ORM with MySQL and DynamoDB. Implemented Spring Security and automated deployments via Jenkins, Docker, and AWS. Ensured API reliability through JUnit and Postman testing under Agile Scrum methodology.

    Environment: Java, Spring Boot, Hibernate, React.js, TypeScript, REST API, MySQL, DynamoDB, AWS, Docker, Jenkins, GitHub Actions, JUnit, Postman, Agile

  • Dec 2021 – Oct 2023
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    Software Engineer

    Capital One – New York, NY

    Developed and maintained React.js front-end interfaces for Capital One’s ML platform, improving usability and performance. Built Spring Boot APIs for model deployment, logging, and secure data retrieval, and migrated legacy Python services to Java microservices for scalability. Integrated MongoDB and DynamoDB for metadata management and workflow tracking. Optimized CI/CD pipelines with Jenkins and GitHub Actions, and collaborated on AWS (Lambda, EC2, S3) integrations. Ensured reliability through JUnit 5 and Postman testing under Agile Scrum practices.

    Environment: React.js, TypeScript, Java, Spring Boot, Python, MongoDB, DynamoDB, AWS, Docker, Jenkins, GitHub Actions, Agile

  • Bachelor of Science in Chemistry

    University of California, Los Angeles (UCLA)

    Los Angeles, CA

    Focused on fundamental and advanced concepts in Chemistry, including organic, inorganic, and physical chemistry, with practical laboratory experience in chemical analysis, synthesis, and instrumentation techniques.

Portfolio

My Recent Works

View All Projects
JWT & OAuth Authentication System
Full Stack Developer · Apr 2025 – Present

Real Estate Development Platform |

Built a cloud-native full-stack real estate platform with React + TypeScript frontend, Node.js + Express backend, and MongoDB Atlas for scalable project management and interactive property visualization. Integrated Mapbox, AG Grid, JWT authentication, and deployed via AWS, Vercel, Docker, and CI/CD pipelines for secure, high-performance delivery.

Certifications

Verified credentials demonstrating expertise in cloud solutions, software development, and architecture best practices.


AWS Certified Solutions Architect

Demonstrates ability to design, deploy, and manage scalable cloud architectures on AWS following best practices.


Oracle Certified Associate (OCA)

Validates foundational knowledge in Java programming and practical application development skills.

Character Traits

Who I Am as a Professional

Problem Solver

Skilled at analyzing complex technical challenges and delivering efficient, scalable solutions across frontend and backend systems.

Collaborative

Experienced in Agile/Scrum environments, working closely with cross-functional teams to align business goals with technical execution.

Tech-Savvy

Proficient in modern frameworks, cloud platforms, and DevOps practices, always staying up-to-date with evolving technologies.

Performance Driven

Focused on building high-performance applications that optimize speed, security, and user experience for fintech and tech industries.

Detail Oriented

Ensures code quality through unit testing, responsive design, and cross-browser compatibility, delivering polished solutions.

Lifelong Learner

Continuously improving skills through hands-on projects, advanced education, and adapting to new technologies and best practices.

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Hello👋 I'm available for freelance & full-time work

Hire me now
  • Available for work - 40 Hours / Weekly
  • Active Status - Active

Let’s work together!