Stephanie Volftsun, Developer in San Francisco, CA, United States

Stephanie Volftsun

Software Developer

San Francisco, CA, United States
Toptal Member Since
June 11, 2015

Stephanie is an entrepreneur and freelance software developer with 10 years of professional experience. She started 2 companies (Knotch, Bubby) which are both still going strong. She's built products from the ground up and has built features on top of larger systems. In general, she love building products that delight people.

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Amazon Web Services (AWS), Microsoft, MongoDB, Express.js, Objective-C, Node.js
SendGrid, Amazon S3 (AWS S3), Amazon EC2, MongoDB, Objective-C, Express.js...


San Francisco, CA, United States



Preferred Environment

GitHub, Git, WebStorm, Xcode, OS X

The most amazing...

...outcome I've achieved is building a niche dating app that has resulted in thousands of dates and several couples.

Work Experience

2016 - PRESENT

Founder | CEO

  • Designed and implemented a native Objective-C matchmaking app.
  • Created matching algorithms using best-in-class approaches to optimize matches and dates amongst the community.
  • Built a chatbot to interact with users; including a state machine mapping dialogue flows and natural language processing to understand responses.
  • Built a Node.js server and RESTful API that supports thousands of production users.
  • Featured in the press; including the Bloomberg Business Week, San Francisco Chronicle, and the New York Observer.
Technologies: Amazon Web Services (AWS), Microsoft, MongoDB, Express.js, Objective-C, Node.js
2012 - 2015

Co-Founder | CTO

  • Architected and built both the Node.js server and RESTful APIs.
  • Built a native Objective-C client app that was featured multiple times by the App Store.
  • Scaled the product to hundreds of thousands of users.
  • Recruited and managed a team of developers to continue to grow the company and our technology.
  • Was featured in many prominent publications including TechCrunch, Mashable, the New York Times, and more.
  • Held a US patent for the invention of our proprietary color-based feedback system and user interface.
  • Managed the product designers and developers to run a highly efficient development team.
Technologies: SendGrid, Amazon S3 (AWS S3), Amazon EC2, MongoDB, Objective-C, Express.js, Node.js



An AI-powered matchmaker that focused on the Jewish community in New York and San Francisco.


The leader in providing data, measurement, and insights for brands around their sponsored content performance.



Objective-C, JavaScript, Swift, Python, Java, SQL


Angular, Express.js, AFNetworking


Node.js, CocoaPods, Facebook SDK, Facebook API, Facebook Login, Stripe, SnapKit, Alamofire, Masonry, Nightwatch.js


Mongoose, MongoLab, Cron, InVision, Sketch, Xcode, WebStorm, Git, GitHub, SendGrid, Photoshop CC, Google Analytics


Mobile Development


Apple Watch, Amazon EC2, OS X, Microsoft, Amazon Web Services (AWS), Mixpanel, Docker, Mailgun


MongoDB, MySQL, Amazon S3 (AWS S3)


Mobile App Development, Web Development, Dedicated iPhone Developer, Facebook Ads


2007 - 2011

Bachelor of Science in Computer Science

Washington University in St. Louis - St. Louis, MO, USA