Full stack development
Web application development agency in Salt Lake City, UT
Our web app development agency specializes in building web and front-end applications using modern frameworks. Based in Salt Lake City, we serve innovative tech companies and startups nationwide.
Your users expect fast, frictionless digital experiences.
Challenges we've helped solve
Slow Time-to-Market
Managing multiple development vendors adds complexity and delays.
Scalability Issues
Many systems struggle to grow with your business and user base.
Maintenance and Upgrades
Ongoing technical needs require cohesive and consistent code architecture.
Full-stack development
You're in good hands
With over 13 years of experience building digital products, we can help you build features quickly, so you can focus on the bigger picture.
4.5
From 10+ google reviews
Testimonials
They caught on to our design routines very quickly and have been a standout designer throughout the entire engagement.
Joanna DeLong
Vivint
I can’t speak highly enough about the Underbelly team! Not only are they a blast to work with, but they helped us clarify and articulate complex business processes, engage our internal stakeholders and users, and put us on track to deliver great value back to the organization. They are highly responsive, maintain clear and consistent communication, and go above and beyond in their delivery. The work they have done will have a long-lasting impact on our organization. I wouldn’t hesitate to work with them again!
Seth McKnight
The Seed Company
We initially selected Underbelly because, as a new company, we wanted a partner who was willing to start small with us. As we've grown, Underbelly has consistently met our needs and exceeded our expectations.
Brian Lovett
Trellis Rx
Trusted by these
leading brands.
Simple & engaging
Our Approach to Development
We specialize in building digital products that feel seamless to users and are easy to maintain and scale. Our team takes a holistic approach, handling everything from frontend design to backend infrastructure—ensuring the entire system works as one.
User Research & Analysis
Design Audits
UX Research
Product Roadmap
User Personas
Discovery Sprints
Usability Testing
Wireframes & Prototypes
User Experience Design
User Interface Design
Interaction Design
Motion Graphics
Illustrations & Iconography
Digital Prototyping
UI Design & Development
Front-End Development
Back-End Development
Web Applications
Mobile Applications
SAAS Implementation
CMS Integration
How we work
Elevate your user experience
We'll work with your team to uncover opportunities and build a roadmap to take your User Experience up a notch.
Benefits
Benefits of Hiring an Agency
With an experienced team member dedicated to you, you and your team are supported every step of the way.
Versatile Team Member
Our augmented team has experience across a multitude of problem areas, making them experts in learning quickly to tackle your specific needs.
Reduce Hiring Risk
By partnering with Underbelly, you have access to talent without having to hire and incur overhead expenses.
Flexible to Your Team Size
Whether you need a single designer of a full team, we scale to fit your needs.
100% Dedication to You
There is no priority overlap, your team member is dedicated to your team 100%.
Outside Perspective
Being in the weeds can limit your perspective. A fresh set of eyes can open new ideas.
Unblock Your Team
Give your team that extra capacity to release faster and beat your competitors to the market.