"303 Software team of app developers and software development experts in Denver, Colorado"

More than just digital products: we’re your partner in driving business success

With a passion for entrepreneurship and technology, our team is committed to delivering results for your business through innovative software solutions that streamline any business process.

Our story

Despite humble beginnings in 2006, this team of “nerdy software guys” has built a thriving business by guiding other businesses through the often-complicated process of software development with a commitment to exceptional service.

303 Software is deeply involved in the Colorado tech scene, working to elevate local businesses and partnering with the US State Department to provide mentorship and support to talented individuals from Latin America and the Caribbean. 303 Software’s boutique approach means you’ll work directly with senior staff members who are passionate about bringing your vision to life with excellence. Trust 303 Software to deliver a truly exceptional product that meets your unique needs.

We utilize design thinking, lean and agile principles to maximize fullstack development and fully realize product potential.

Our leaders

303 Software’s leadership team brings a wealth of experience to the table, with a diverse range of expertise across strategy, engineering, technology, and entrepreneurship. For more than 17 years, clients have trusted them to guide their software development projects from ideation to execution. With a focus on improving clients’ business processes and bringing their vision to reality, 303 Software’s leadership team is committed to delivering successful outcomes.

"Matt Jaffe, President and CEO of 303 Software in Denver, Colorado"

Matt Jaffe

President and CEO

Matt is a Colorado serial entrepreneur who got his start during the first dot-com boom, working for early tech startups like The Red Herring Magazine, CNET, and Gamespy. As 303 Software’s co-founder, Matt’s work centers around strategy and sales. His passion is to help 303’s clients improve the way they work and do business.


Scott Quinney, Director of Engineering at 303 Software, Denver, Colorado

Scott Quinney

Director of Engineering

Scott leads the engineering team at 303 Software. He has held senior software engineering positions at Fortune 500 companies including Microsoft, AMD, and Texas Instruments. While at AMD, Scott was awarded a US patent for his contributions. At 303 Software, he received an “Outstanding Partner Award” for his work on Spectralink, and his app development work for CIRSA resulted in an industry recognition award.

Tom Montgomery, Chief Technology Officer of 303 Software in Denver, Colorado

Tom Montgomery

Chief Technology Officer

Monty has been building and growing software products for over 20 years for both enterprises and startups. He has led an established product into the Gartner Leader Quadrant and has achieved traction with high risk greenfield products. At 303 Software he leads product development, guiding Fortune 500 projects and new founders to reveal their path, bringing vision to reality. Monty enjoys floating down any old river, and especially loves the grand adventure of the annual road trip with the family.

Zach Mangelsdorf, co-owner of 303 Software

Zach Mangelsdorf


Zach is an innovative and creative strategist with 15+ years’ business experience spanning traditional industries to startups.  After founding and selling his own “tech” startup in the Denver area, he rejoined his family business in the petroleum services industry in St. Louis.  Since then, Zach has founded additional ventures while also becoming a co-owner of 303 Software. His varied experiences give Zach a well-rounded view of how to efficiently and successfully operate any organization.  You’ll find Zach skiing or snowmobiling in the picturesque Rockies in his spare time or enjoying some quality time with his wife, daughter and their two dogs.