# Derek Fong

> Senior Software Engineer

Location: Sunnyvale, California, United States
Profile: https://flows.cv/derekfong

Versatile software developer with over nine years of experience in full stack development and design of web applications utilizing Java, PostgreSQL/MySQL and RESTful services.

## Work Experience
### Senior Software Engineer @ Ad Hoc LLC
Jan 2023 – Present

### Software Engineer @ Upstart
Jan 2020 – Jan 2023
I was part of the Growth and Distribution team, primarily focused on developing our Ruby on Rails backend.
- Designed and implemented experimentation enhancements to existing framework
- Trained and mentored an intern in the architecture, design and development process to launch a new product

### Senior Software Engineer @ Groupon
Jan 2016 – Jan 2020
I was part of the Third Party Inventory Platform team, working in a Java backend role developing RESTful services.

- Developed integrations for ingesting, transforming, and loading merchant offerings into Groupon’s systems
- Led development of a new service for external integrations with third-party partner services
- Designed and implemented a REST service for the operations team to onboard new partners without engineering support
- Architected an offer deduplication micro-service to identify Groupon offers that were available from multiple sources. Significantly reduced presentation of identical offers with a 95% accuracy rate.

### Senior Software Engineer @ Emergent Payments
Jan 2013 – Jan 2016 | Palo Alto, CA
I was part of the Platform team, working on everything from frontend development in AngularJS to REST services. I coordinated with the UI design team to convert UI mockups into user-friendly web applications using AngularJS.

I previously worked on the Merchant Services team to deliver web applications to facilitate microtransactions for desktops and mobile devices.

### PHP Developer @ PLX Devices, Inc.
Jan 2010 – Jan 2013 | Sunnyvale, CA
•	Led and participated in the design, testing, and deployment of major business to business web application.
•	Developed and maintained backend system for company website.
•	Delivered internal-use software tool to automatically record data from external websites.
•	Integrated and maintained open source web applications alongside existing company infrastructure to simplify operations and enhance customer service experience.

### Quality Engineer @ PLX Devices, Inc.
Jan 2009 – Jan 2010 | Sunnyvale, CA
•	Proposed and assisted in development and testing of interface to enable automated transfer from e-commerce web application to company accounting software.
•	Supported software development teams in testing and deployment of software.
•	Designed test procedures for new products and streamlined existing test procedures.

### Engineering Intern @ PLX Devices, Inc.
Jan 2009 – Jan 2009 | Sunnyvale, CA
•	Designed and implemented technical troubleshooting procedures for new products.
•	Improved documentation of existing test processes to ensure consistent test criteria.
•	Developed macros and scripts to automate time-consuming manual processes.
•	Configured and maintained test servers for web application development.

### Student Assistant IV @ University of California, Davis
Jan 2007 – Jan 2008
•	Prepared cross-section samples for electron microscopy
•	Assisted in operating machinery
•	Maintained lab machinery in an acceptable operation status


## Education
### Bachelor of Science in Materials Science and Engineering
University of California, Davis


## Contact & Social
- LinkedIn: https://linkedin.com/in/derekjfong

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Source: https://flows.cv/derekfong
JSON Resume: https://flows.cv/derekfong/resume.json
Last updated: 2026-04-01