Rely on 540 to build predictable, fast and secure technology platforms.

Custom website and application development to help businesses scale.

At 540 we help organizations transform their business with software solutions that matter. We consider our clients partners, with a relentless focus on customer relationships we help them generate revenue, extend their market reach and enhance their offerings through digital platforms. Our commitment to your project does not end upon the launch. We are always available for quick fixes and offer dedicated monthly support solutions.

We focus on user experience and deliver digital products that integrate seamlessly into your workflow on the back-end and present a wow factor to your customers on the front-end.

Whether you need a website, mobile app or full scale software application, our design + development is clean, professional and highly optimized for speed and search.

Celebrating 15 years of business in 2022!

We enjoy getting to know our clients on a personal level, building lasting relationships and becoming an extension of their team. We take pride in the fact that over 95% of our business is referral based.

Matt StellwagenFounder

UX and Design

Each project starts with a custom design. The client is fully engaged from wireframe to storyboard to avoid any latency. 

Quality Assurance Testing

Our Agile testing process provides valuable information throughout the development cycle including functionality, performance, security, usability & integration. 

Web Development

From small start-up websites to full-scale eCommerce and robust web applications, we align your business goals with modern tech.

Ongoing Support

Launching the project is just the first step in the relationship. We handle quick fixes and offer monthly support plans to handle both server and project maintenance.

Mobile Applications

We develop native apps for iOS & Android as well as hybrid apps to produce stunning mobile platforms for your customers and increase ROI.

Consulting for Startups

We offer hourly consultation, whether you are scoping a deliverable or need an MVP for a pitch deck, our expertise and experience can add value.


We are innovators who hold extensive knowledge and experience in web and mobile application design and development.

Matt Stellwagen, MSc

Founder / Head of Development

Matt created his first website in 2005 as part of a project he was working on in his Operations role at Banc of America Securities. Discovering a passion for all things data and web Matt engrossed himself in system architecture, database applications and web programming languages. After several side freelance jobs and continuous referrals a business was born, 540 Interactive, LLC. 

Although Matt still loves to dabble in code, he focuses his time working with clients to analyze their technology needs and design applications that will help their organizations reduce workloads, increase overall efficiency and profitability. This includes overseeing all development, managing deliverables, working with stakeholders and producing best-in-class applications and websites. 

Matt received a Bachelors Degree in Finance from Syracuse University and a Masters in Information Systems from Pace University. He has previous experience working in IT & Project Management roles for large financial institutions including UBS Investment Bank and Banc of America Securities and has successfully completed the Series 4, 7, 8, 14, 24, 27, 63 & 65 examinations.

Matt is a 3x Ironman triathlon finisher and gains inspiration from his constant activities outdoors and spending time with his wife and 5 year old daughter.

Sarah Fey

UX/UI Designer

Sarah Fey has been designing and copywriting since Macs came in bright colors. She is proud of her long relationships with clients who include universities, schools, education-related organizations, healthcare practices and startups. Her work receives attention for its strategic focus, elegance, narrative sophistication and particularly for its powerful integration of language and imagery.

Before moving to Connecticut, Sarah was a founding partner of Philographica in Boston. There she created publications for Harvard Business School, MIT and Groton School, to name a few. Sarah has also designed and art directed several business magazines, including two for Michael Bloomberg.

Sarah holds an MFA from Yale University and a BA from Amherst College. She has received awards from Yale University, Print magazine, How magazine, the Society of Publication Designers, the Connecticut Press Club and the National Federation of Press Women. Her work has also appeared in design books.

Kyle Merine

Developer / Support

Kyle is the swiss-army knife of the 540 development team assisting Matt on core application development and jumping in to assist clients on WordPress updates and general product support. Having worked for agencies in Boston and Maine as well as running his own successful freelance business, Kyle is always ready to tackle every development task. 

After graduating with a Computer Science Degree from Brandeis University, Kyle focused on database application and mobile technology for local agencies. He broadened his learning by enrolling in coding challenges and freelance work. Skilled in all aspects of both WordPress, Shopify customization and iOS and Android development Kyle’s contribution to successful deliverables to our clients are always present.  

When the computer shuts down Kyle enjoys getting outside with his yellow lab and hiking various trails in New England. 

Development Team

Our developers and designers are all our own vetted and trained team members. No 3rd parties. This allows us to ensure the highest quality and cutting-edge development. We have a proven track record of success!

The demand for our services keeps growing. If you are passionate, hard working and nerd out about all things Mobile, Web, Database, Cloud, Fintech, Blockchain and everything in between consider joining our team. Email matt@540interactive.io to introduce yourself, drop your CV and get the interview process started.

Positions available in Darien, CT, Kennebunk, ME and remote.