ZF Zi Feng

Portfolio / Redmond, WA

Zi Feng

Backend Software Engineer

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02

Skills

The tools I reach for.

Python Python
Java Java
JavaScript JavaScript
SQL SQL
HTML HTML
CSS CSS

// LANGUAGES

  • Python
  • Java
  • JavaScript
  • SQL (Postgres, Trino, Spark)

// BACKEND & DATA

  • Data architecture and modeling
  • REST APIs
  • Event driven systems
  • Microservices
  • Git
  • pytest
  • mypy

// CLOUD & AWS

  • Lambda
  • Glue
  • Kinesis
  • DynamoDB
  • S3
  • Athena
  • Redshift
  • CloudWatch
  • Bedrock
  • CI/CD
03

Experience

The what, where, when, and why of my work.

  1. Data Engineer

    Amazon Redmond, WA

    Aug 2025 to Present
    • Architected Amazon LEO's first unified statistical process control data platform on AWS and Grafana, owning 12 Glue pipelines processing 50,000+ manufacturing records daily across 7 cross functional teams.
    • Built real time anomaly detection and alerting across 8,000+ parameters using AWS Lambda, DynamoDB, and Kinesis, eliminating continuous manual monitoring and improving production yield by 10%.
    • Released a Lambda REST API detecting Nelson Rules and relevant statistical patterns, enabling other teams to self serve integration and saving roughly a day of onboarding each.
    • Built AI driven risk models using AWS Bedrock that automate fishbone diagrams, 5 Why root cause analysis, and historical issue research, reducing initial alert investigation from an hour to a 5 minute read.
    • Engineered scalable ETL architecture, a standardized data model, and distributed systems practices, improving refresh performance by 90% and cutting analytics development cycles from 3 weeks to 1 day.
    • Authored organization wide SPC policy establishing process monitoring, root cause analysis, and continuous improvement standards supporting AS9100 compliance across 6 facilities.
  2. Software Engineer

    Intsu Studios Founder

    May 2025 to Present
    • Founded Fin, a free, privacy first personal finance and career tracker built as a comprehensive alternative to paid tools and subscriptions.
    • Designed and launched a custom restaurant website, driving a 20% increase in customer conversion.
  3. Systems Engineer

    Redwood Materials

    Aug 2024 to Aug 2025
    • Redesigned the incident reporting and problem solving application, cutting operational waste by $50,000+ annually.
    • Built and contributed to internal engineering tools in Python, Java, React, and FastAPI, improving lab, chemical, and materials workflows and saving $35,000+ annually.
    • Designed dashboards tracking 2,000+ samples, lab results, and material flow for engineering departments, saving $20,000+ annually.
    • Automated manual tasks using Python and Power Automate, improving operational efficiency by 15%.
04

Projects

Things I have shipped and the stories behind them, newest first.

Jun 2026 Founder build

Fin

React Tailwind Vite Supabase IndexedDB

A free, privacy first personal finance and career tracker built as a full alternative to paid subscription tools. I architected a two mode system supporting both Supabase cloud accounts and a decentralized, local only IndexedDB experience, delivering a near identical experience while giving users full control over how their data is handled.

  • Cloud and local only accounts from one codebase
  • Offline first data with IndexedDB
  • Finance and career tracking in one place
Fin overview dashboard Fin assets and allocation Fin debt tracking Fin spending breakdown
May 2025 Client work

Siu Korean BBQ

HTML CSS JavaScript

A fully custom website for the owners of Siu KBBQ, built to give a hidden gem the reach it deserved. Before this the restaurant had no site to introduce its menu or story, so I built one to bring in new customers and drive traffic, which lifted customer conversion by 20%.

  • Custom animations and interactive menus
  • Google Maps integration
  • Modern, responsive multi page layout
Siu website homepage Siu all you can eat menu page Siu express menu page
May 2025 R&D

Intsu Studios

Business

I founded Intsu with a single goal, to turn my interests and hobbies into something more meaningful. Officializing my work as a business.

  • Freelance Software Engineering
  • Content creation across multiple platforms
  • Handmade clothing and accessories
  • 3D printed manufacturing
Intsu Studios logo
Apr 2025 Android app

Vac Track

Java XML Room

An Android app that helps users manage vacations and excursions in a streamlined, offline environment. It uses a clean UI, industry standard security practices like input validation, and Room to keep dependencies minimal.

  • Vacation and excursion management
  • Notifications and alerts
  • Data sharing, search, filter, and report generation
Vac Track login screen Vac Track home screen Vac Track add vacation Vac Track edit vacation Vac Track excursion Vac Track edit details Vac Track selection Vac Track share Vac Track report
05

Credentials

Education and certifications.

// EDUCATION

  1. B.S. Software Engineering

    Western Governors University

    Apr 2023 to May 2025
  2. General Education and Transfer

    Truckee Meadows Community College

    Aug 2019 to Aug 2021
06

About Me

Get to know me.

I have always preferred a hands on approach to engineering. My background started on the production floor in quality and manufacturing roles, where I learned how much the boots on the ground details actually matter. That foundation gives me a practical perspective on how things are built and how to address the friction that often exists between design and reality.

Right now I am focused on building technical solutions that I can own end to end. I enjoy taking complex, technical environments and building the data solutions required to make them more efficient. I take a lot of pride in being proficient across the stack and ensuring that the systems I build are practical enough to actually work in a real world setting.

In my off hours I am usually still building or optimizing something. That usually looks like pushing the limits of 3D printing with engineering grade materials, working on mechanical DIY projects, or refining strategy in a competitive game. I am a big believer that being a well rounded engineer is about staying curious and never really stopping being a builder.

07

Resume

The full document. Read it here or take it with you.

Zi Feng // Resume 2026
08

Contact

Say hello. I will get back to you.

Whether it is a role, a collaboration, or a question about something I have built, I would be glad to hear from you.