St. Louis Web Development Company | Since 1999
Custom Web Development Built Around Your Business
TPI has built custom websites and web applications for businesses and organizations for over 25 years. We write clean, maintainable code, in the most widely used languages and platforms, including PHP, WordPress, and beyond — built to grow with your business and easy for your team to manage.
25+
Years of experience
500+
Websites launched
5
Star Google rating
Let’s start a conversation
Schedule a free intro call – just a conversation, not a commitment.
Our Web Development Toolkit
Clients We’ve Been Proud to Work With
Why ThoughtProcess Interactive?
Thoughtful Development. Lasting Partnerships.
Every project starts with understanding your goals and your audience. No gimmicks, just purposeful development backed by the design, digital marketing, and long-term support that helps a great-looking site provide continued performance.
Web Design
We focus on human-centered UX and web design strategies to effectively communicate your message.
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Web Development
Our developers leverage emerging technologies as well as tried and true web development tactics.
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Digital Marketing
We help reach your audience to drive traffic, increase engagement, and improve your site’s performance.
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Management & Support
From WordPress plugin updates to internet security, our team keeps your site running smoothly.
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Trusted Partners, Not Vendors
A great website or web application is just the beginning. Our clients rely on us for design, marketing, support, and a partnership that grows with their business.
Explore Our Work
Explore short case studies of some websites and other development projects to see how we have helped our clients get the most out of their online presence.
Web Development Questions We Hear Often
We specialize in PHP for back-end development, including WordPress and other platforms. We use various JavaScript and CSS frameworks for front-end development, and other technologies as-needed to suit the project. We also work with WooCommerce, REST APIs, and a range of third-party integrations. If you have an existing tech stack or custom integration you need, we’re happy to discuss whether it’s a good fit.
Both. Many of our clients come to us with an existing site that needs new functionality, a technical overhaul, or ongoing development support. We’re comfortable inheriting code we didn’t write, but we also love to start from scratch.
We work with organizations whose projects typically range from $15,000 to $100,000+. That’s a big range, and those aren’t hard limits at either end. If you’re not sure whether your project fits, just reach out. We’re happy to have an honest conversation about scope.
We sure do. Most of our client relationships extend well beyond the initial project. We offer management and support services that cover everything from routine updates to security monitoring to continued development. We have some clients that we have been working with for over 20 years.
We’re a local agency based in the St. Louis / St. Charles area, but we work entirely remotely. We’ve been serving the St. Louis region since 1999, and have been working with clients across the country for just as long. Video calls and meetings work great, but if you’re nearby, we’re always happy to meet in person, too.
You get a dedicated local team with 25+ years of experience, not a single point of failure or a contractor you’ve never met. We’re invested in long-term relationships, and most of our clients have worked with us for years.
Ready when you are.
No pressure, no pitch. Just an honest conversation about your development needs and whether TPI is the right technical partner for you and your long-term goals. Fill out the form and we’ll reach out to start the conversation.