# Peter Hollingsworth

> Programmer at craigslist

Location: Oakland, California, United States
Profile: https://flows.cv/peterhollingsworth

Full-stack/front-end engineer and interaction designer with 10+ years experience delivering solid and successful web, desktop, and mobile products.

## Work Experience
### Programmer @ craigslist
Jan 2018 – Present | San Francisco
Helped design and build the Craigslist App using React Native.

Building site features in PERL (yes, PERL) and also Backdraftjs and other JS libraries.

### Senior Applications Engineer @ Medidata Solutions
Jan 2016 – Jan 2018 | San Francisco, CA
SaaS application for setting up and managing clinical trials worldwide. Front-end coding primarily in React JS.

### Senior Development Engineer @ ClearCare
Jan 2012 – Jan 2016 | San Francisco, CA
- Designed and coded major features for SaaS application for home-care agencies including scheduling, billing, payroll, accounts receivable, graphical reporting, and integrated telephony. 

- Evolved the ClearCare application into the dominant industry leader, supporting hundreds of thousands of clients and caregivers across thousands of home-care agencies. 

- Created innovative new interfaces enabling families to keep track of their loved ones' care and touch base with caregivers on a daily basis.

Technology stack: front-end HTML, CSS, javascript (Angular, Jquery), Django/Python and Postgres DB. Also microservices for credit-card processing and caregiver applicant tracking.

### Front-End Architect @ CBS Interactive
Jan 2008 – Jan 2012 | San Francisco
Coded front end for major redesigns and enhancements of TV.com (20M uniques/month) including desktop, mobile web applications, and social networking hooks.

### Interaction Engineer @ Yahoo
Jan 2003 – Jan 2008 | Sunnyvale
Hotjobs, Yahoo! Games, Yahoo! TV, Food, Health, News.

### User Interface Engineer @ Genealogy.com (now Ancestry.com)
Jan 1998 – Jan 2003 | Fremont, CA
Built one of the first JSON/AJAX web applications on the web ("Family Tree maker Online"). Helped create online subscription system that is now part of the largest paid data-subscription service on the web.

### Various @ Geoworks
Jan 1990 – Jan 1998 | Berkeley, CA
Helped create PDAs and early smartphone applications for Palm, Nokia, HP, Sharp, Casio, and others.


## Education
### BA in Physics
University of California, Santa Cruz


## Contact & Social
- LinkedIn: https://linkedin.com/in/peter-hollingsworth-748147

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Source: https://flows.cv/peterhollingsworth
JSON Resume: https://flows.cv/peterhollingsworth/resume.json
Last updated: 2026-04-10