Functional Application PrototypingRobert Kaltenbach
I specialize in rapidly turning early-stage ideas into polished MVPs and production-ready prototypes, bridging strategy, design, and engineering to help businesses validate concepts and move to market quickly without sacrificing quality. My process emphasizes speed with intention—preserving and elevating brand identity, building scalable technical foundations, and intentionally highlighting the differentiators that make your product stand out in a crowded landscape. I work end-to-end, from concept refinement and UX/UI design through implementation, ensuring each prototype is not only functional, but positioned for real-world use, iteration, and growth.
What's included
App Concept & Functional Blueprint
Before a single screen is built, we’ll map out your idea’s core features, flow, and data structure.
Includes:
• User journey mapping
• Key feature breakdown
• Backend architecture plan
• Recommended tech stack and scope outline
You’ll walk away with a clear roadmap for development — a concise document that defines what’s being built and how it works.
Functional Application Prototype
Bring your concept to life with a fully functional vertical slice of your next application or rollout.
I design and build working prototypes that look and feel production-ready. Complete with backend systems, database services, and a connected user experience. Whether you’re validating an idea, preparing for investor demos, or streamlining an internal rollout, the end result is a tangible, testable build that proves your vision works.
Perfect for startups, agencies, and teams that need to show what they’re building, not just talk about it.
Deployment & Handoff Package
Once your prototype is complete, I’ll deliver a clean, organized project handoff that ensures you or your dev team can move forward smoothly.
Includes:
• Source files and credentials
• Documentation of database structure and logic
• Deployment setup (web/app publishing or demo-ready link)
• Optional recorded walkthrough or live session
FAQs
You’ll receive a fully functional prototype; a working vertical slice of your app with real backend and database integration. It’s designed to look, feel, and behave like the finished product so you can test, demo, or continue building immediately.
Absolutely. I build everything with scalability in mind. The prototype can serve as your technical foundation, meaning your dev team can continue from it without rebuilding from scratch.
Most prototypes are completed within 1–3 weeks, depending on scope. I move fast, the goal is to help you validate and showcase your idea without long development cycles.
That’s all I need. I can help you define the core functionality, design the flow, and deliver a build that communicates your vision clearly to investors, users, or stakeholders.
Yes. Every prototype includes intuitive interface design and user flow planning. If you already have design assets or branding, I’ll incorporate them; if not, I’ll create clean, modern visuals to match your concept.
The backend is real. I use live database connections and APIs so your prototype behaves like a true application — logins work, data persists, and interactions are functional.
Yes. Depending on the project’s complexity, I can connect third-party APIs, AI features, or payment systems to make your prototype as functional and realistic as possible.
You do, 100%. All design files, source code, and credentials are transferred to you upon completion.
I focus on building functional clarity. Every project feels real from day one — not just a design mockup, but a working system with a purpose. You’ll walk away with something you can click, test, and show off with confidence.
Example work
Robert's other services
Starting at$750 /wk
Tags
Adobe Illustrator
Adobe Photoshop
Cursor
Expo
Supabase
iOS Developer
Vibe Coding
Web Developer
Service provided by
Robert Kaltenbach proChicago, USA
- $1k+
- Earned
- 5
- Paid projects
- 5.00
- Rating
- 80
- Followers
Functional Application PrototypingRobert Kaltenbach
Starting at$750 /wk
Tags
Adobe Illustrator
Adobe Photoshop
Cursor
Expo
Supabase
iOS Developer
Vibe Coding
Web Developer
I specialize in rapidly turning early-stage ideas into polished MVPs and production-ready prototypes, bridging strategy, design, and engineering to help businesses validate concepts and move to market quickly without sacrificing quality. My process emphasizes speed with intention—preserving and elevating brand identity, building scalable technical foundations, and intentionally highlighting the differentiators that make your product stand out in a crowded landscape. I work end-to-end, from concept refinement and UX/UI design through implementation, ensuring each prototype is not only functional, but positioned for real-world use, iteration, and growth.
What's included
App Concept & Functional Blueprint
Before a single screen is built, we’ll map out your idea’s core features, flow, and data structure.
Includes:
• User journey mapping
• Key feature breakdown
• Backend architecture plan
• Recommended tech stack and scope outline
You’ll walk away with a clear roadmap for development — a concise document that defines what’s being built and how it works.
Functional Application Prototype
Bring your concept to life with a fully functional vertical slice of your next application or rollout.
I design and build working prototypes that look and feel production-ready. Complete with backend systems, database services, and a connected user experience. Whether you’re validating an idea, preparing for investor demos, or streamlining an internal rollout, the end result is a tangible, testable build that proves your vision works.
Perfect for startups, agencies, and teams that need to show what they’re building, not just talk about it.
Deployment & Handoff Package
Once your prototype is complete, I’ll deliver a clean, organized project handoff that ensures you or your dev team can move forward smoothly.
Includes:
• Source files and credentials
• Documentation of database structure and logic
• Deployment setup (web/app publishing or demo-ready link)
• Optional recorded walkthrough or live session
FAQs
You’ll receive a fully functional prototype; a working vertical slice of your app with real backend and database integration. It’s designed to look, feel, and behave like the finished product so you can test, demo, or continue building immediately.
Absolutely. I build everything with scalability in mind. The prototype can serve as your technical foundation, meaning your dev team can continue from it without rebuilding from scratch.
Most prototypes are completed within 1–3 weeks, depending on scope. I move fast, the goal is to help you validate and showcase your idea without long development cycles.
That’s all I need. I can help you define the core functionality, design the flow, and deliver a build that communicates your vision clearly to investors, users, or stakeholders.
Yes. Every prototype includes intuitive interface design and user flow planning. If you already have design assets or branding, I’ll incorporate them; if not, I’ll create clean, modern visuals to match your concept.
The backend is real. I use live database connections and APIs so your prototype behaves like a true application — logins work, data persists, and interactions are functional.
Yes. Depending on the project’s complexity, I can connect third-party APIs, AI features, or payment systems to make your prototype as functional and realistic as possible.
You do, 100%. All design files, source code, and credentials are transferred to you upon completion.
I focus on building functional clarity. Every project feels real from day one — not just a design mockup, but a working system with a purpose. You’ll walk away with something you can click, test, and show off with confidence.
Example work
Robert's other services
$750 /wk