We retrofit your existing system with our readerless NFC mobile credential software. No extra hardware costs or disruption is needed to turn your door entry system smart.
We begin with a thorough evaluation of your current access control system hardware and firmware to find out whether it falls into our portfolio of integrations.
We identify hardware, software, and infrastructure needs e.g. number of doors and users, what type of door locks, and any existing building applications used by tenants and visitors.
Next we remotely add our cloud software to your access control servers. This doesn’t require any downtime.
If there is an existing building app used by tenants and visitors we can look at adding the capability of NFC mobile access to it via our open SDK, to provide a value-add.
We then configure the new system settings and conduct comprehensive tests to ensure optimal performance.
We walk you through how to setup your building admins, grant remote access permissions, send time-limited visitor passes and set security restrictions.
Finally, we will show you how it works and perform a final check to confirm everything is operational and meets your building security needs.

Retrofitting involves upgrading your existing door entry system with new features to enhance its functionality and security without the expense of a complete replacement. Ideal for organizations with a functional system that needs improvement but don’t want to face the added costs of new system hardware, such as door reader upgrades.

Retrofitting your access system is less intrusive and often involves minimal downtime compared to a complete system replacement. This means your daily operations continue smoothly while your security infrastructure gets a significant upgrade.

For organizations satisfied with their current setup but seeking enhanced functionality—like mobile access, retrofitting allows you to keep your existing infrastructure intact. This approach not only saves time and money but also simplifies the transition to improved security measures.
Our readerless NFC mobile credentials are compatible with most major physical access control systems.





Extend the life of your access control systems and provide the choice of secure NFC mobile credentials to automate operations and optimize user experience.
Connect with a member of our team within 24 hours.
Get a system audit for integration.
Deploy and activate mobile credentials within days.
William is an experienced British entrepreneur, founder, and accomplished board executive and advisor for a number of businesses. He is the CEO and co-founder of Doordeck, the world’s only true cloud-based access control aggregator. He is also the managing director and founder of Group Secure, a leader in providing security, CCTV, and access control solutions, products, and installation for high-net-worth individuals in the UK.
William established his first business at just seventeen and brings 20-plus years of in-depth experience and industry knowledge. He has a proven track record for building businesses from the ground up—and then leading them to profitability and a successful exit across a myriad of sectors including hospitality, retail, security, telecommunications, and e-commerce. William’s leadership, vision, and experience in creating cutting-edge SaaS-based technology platforms will prove invaluable for Sentry Interactive moving forward.
CHAIRMAN & CEO
Mr. Davis is an Experienced corporate board member, having served on boards of public, private equity-backed, and venture-backed companies. Jon possesses deep industry expertise in dairy, food processing, food technology and manufacturing, and food, beverage, and entertainment services.
During Jon’s tenure of 25 plus years, he’s led operations, research and development, and mergers and acquisitions. He’s served as CEO and has been the founder and active board member for many successful enterprises—from startups to billion-dollar corporations. While COO and CEO of Davisco Foods International, Jon built a state-of-the-art cheese plant which was awarded the United States Dairy processing plant of the year in 2005 by Dairy Foods magazine. Currently, Jon is active with several non-dairy projects, including investments in local real estate, the Wayzata Brewworks, and his latest venture the new CōV restaurant in Edina’s Galleria.
Joe is an American entrepreneur, investor, and accomplished executive. He has co-founded, founded, and led many successful businesses, including US Internet, a leading fiber internet service provider, Securence, a leading provider of email filtering software, and Ravon, an industry-leading digital voice communications service.
It was Joe’s venture, Municipal Parking Services (MPS), that inspired him in 2020 to start Sentry Interactive, an advanced touchless and staffless detection platform.
Caldwell currently serves as CEO and Chairman of the Board for Municipal Parking Services (MPS), a global tech company based in Austin, TX responsible for inventing and patenting technologies that assist in parking and security enforcement.
Joe was named one of Minnesota’s 500 Most Powerful Business Leaders for the past two years—and is a seasoned corporate board member. He’s served on boards of public, private equity-backed, and venture-backed companies—and has deep industry expertise in all aspects of digital technology.
Board of Directors