Where are you with your app?
I have an app idea.
If you have an idea for an app, Brian Kayfitz Development can bring it to life. He has built apps across many different app categories, including eCommerce, Finance, Travel, Messaging, and Games. Get your app published app on the App Store or Google Play.
I have an existing app.
Whether you need to scale an existing app, convert it to Flutter, or turn a vibe-coded prototype into a production-ready product, Brian can help. With his development experience, he can improve performance, strengthen your codebase, and prepare your app for real-world growth.
I need expert guidance.
Do you or your team need training or help overcoming a roadblock? Brian has experience working with developers of all levels and teams of all sizes. He provides hands-on guidance, solves technical challenges, and mentors developers to keep projects moving forward.
Personal Apps Brian Has Built
Brian Kayfitz Demo App
While others talk about what they can build, you can see what Brian can do. Download Brian Kayfitz Development app and experience our work for yourself.
About Brian Kayfitz
Brian Kayfitz is a Toronto-based mobile app freelancer with extensive experience developing and maintaining apps that have scaled to millions of users. His portfolio includes projects like Swiss Chalet’s food delivery app, BMO Investorline (an award-winning investment app), and Visited (a travel app downloaded by millions and available in 30 languages). Brian is also the author of the Flutter Cookbook, helping developers master Flutter.
Brian’s career began in game development for PlayStation and Xbox, later transitioning to Unity mobile games. With the launch of the iPhone, he developed a children’s app in Objective-C before moving on to develop BMO’s Investorline app, which earned industry accolades. He learned Kotlin to support Android app development, including building Visited—a large-scale, AWS-backed travel app.
Since Flutter’s debut in 2017, Brian has specialized in Flutter development, including building Swiss Chalet’s food delivery app. In 2020, he launched Brian Kayfitz Development Corporation, a Toronto-based agency focused on startup app development, converting native apps to Flutter, mentoring developers, and managing mobile app teams. Recently, Brian has been integrating AI agents using large language models with Flutter-based front ends.
Since its inception, Brian Kayfitz Development has helped build and guide mobile apps for both iOS and Android, delivering quality and scalable solutions.
Some of Apps Brian Has Worked On
More than just mobile app development Services:
App Development
If you have an idea for an app, Brian Kayfitz Development can bring it to life. We’ve built apps across more than eight categories, including eCommerce, Finance, Travel, Messaging, and Games. Get your app published app on the App Store or Google Play.
App Development Training
Does your team need training or are you facing a roadblock? Brian has experience working with developers of all levels and teams of all sizes. He helps solve problems, coach, and mentor programmers to move projects forward efficiently.
Mobile App Strategy
Not sure which language or framework to use? Should your app be built with native or cross-platform technologies? How should you architect your app to build a strong foundation for the future? Brian can help you develop a solid mobile development strategy.
Convert to Flutter
For most companies, maintaining two codebases not only increases costs but also consumes valuable time. Brian can help you convert your native apps to Flutter and provide training for your team to ensure a smooth transition to Flutter development.
Code Reviews
Brian offers code review services for app developers. Before merging new code, we thoroughly check for bugs, ensure the code is clean, and verify it is testable. We believe that while it’s easy to write code a computer can understand, the true craft of programming lies in writing code that another human can easily understand.
MVP App Development
If you have an app idea, want to test its market viability, or have a working prototype for investors, Brian can build your app. He has built multiple MVP apps and can determine the minimum viable product needed for a quick launch.
Development For:
Adding AI to an existing mobile app or looking to build one powered by AI?
Brian Kayfitz has experience integrating LLM models into mobile apps built with Flutter. By incorporating LLM services and custom models into your Flutter UI, you can enhance functionality, accelerate research, and reduce maintenance.
Whether you have an existing app that requires Python integration or are looking to develop a new mobile app with AI capabilities, we’ve got you covered. Brian Kayfitz is a Flutter and Python mobile app development agency. Learn more about AI can be integrated with your app, here.
App Categories Worked In
Games
If you’re looking to build a game app in Unity or Flutter, Brian Kayfitz Development can help bring your vision to life. Brian has experience building a variety of games, including math games, puzzle games, card games, board games, multiplayer titles, and arcade-style games. Learn more about game development
Retail App
If you’re looking to build an app on existing platforms like Shopify or BigCommerce, add eCommerce features to your current app, or create a custom retail app from scratch, Brian Kayfitz Development has got you covered, from initial development and integrations to launch and ongoing support. Learn more about having your eCommerce App developed
FinTech App
From fintech startups to traditional banking and investment platforms, Brian Kayfitz has extensive experience building fintech and investment apps. He was a developer behind the award-winning BMO InvestorLine app and has also helped several fintech startups build and launch their mobile apps. Learn more about developing a financial app
Health App
From patient management systems to telehealth solutions, Brian has experience collaborating with hospitals, doctors, and healthcare startups to develop apps that can truly save lives. Learn more about health app development.
Productivity App
Have an idea for a productivity app? Brian Kayfitz has experience developing solutions that help teams and even military personnel operate efficiently and effectively. Learn more about productivity app development
B2B App
Looking for an app to streamline your business or support other businesses? Brian Kayfitz has built apps for operations, analytics, and a wide range of business needs. Get your B2B app launched on the mobile app stores with expert guidance. Learn more about developing a business app
Travel App
Brian Kayfitz built Visited — a travel app that’s been downloaded by millions and supports 30 languages. Whether it’s bookings, navigation, or managing your itinerary, Brian delivers seamless travel solutions. Learn more about travel app development
Educational
Looking to launch your own restaurant app or something for the food & drink world? Brian’s built plenty of apps in the food industry and is ready to bring yours to life. Learn more about educational app development
Food & Drink
Looking to launch your own restaurant app or something for the food & drink world? Brian’s built plenty of apps in the food industry and is ready to bring yours to life. Learn more about developing a restaurant or food/drink app
Fitness App
Fitness apps are some of the most profitable out there. Whether you want workout tracking, nutrition logging, progress monitoring, or social challenges Brian can build it all. Got a fitness app idea? Look no further! Learn more about fitness app development
Entertainment
Got an entertainment app idea or need fresh features for your existing app? Brian Kayfitz, mobile app freelancer, can bring it to life with Flutter/Dart, fast and polished. Learn more about building an entertainment app
Lifestyle
Need an app for a niche audience? From gardening enthusiasts to couples planning their fertility journey, Brian’s built lifestyle apps that truly connect. Let him build yours. Learn more about lifestyle app development services
Kids App
As a father, Brian Kayfitz approaches children’s app development with care and intention. If you’re looking to develop a children’s app, Brian Kayfitz can help bring your vision to life Learn more about developing a children’s app
Music App
Music apps can be educational, entertaining, or utility-based. Brian offers music app development services for all your musical ideas. Learn more about music app development services
Utility App
Utility apps help users solve everyday problems. Brian Kayfitz specializes in building efficient, user-friendly utility apps tailored to your specific needs. Learn more about utility app development
Legal App
Looking to add mobile legal services, streamline your law firm’s operations with an internal app, or create a secure digital vault? Brian Kayfitz can bring your idea to life, turning your vision into a functional, user-friendly app tailored to your firm’s needs. Learn more about building a law firm or legal documents app
Sport App
Running a sports club, managing a youth team, or part of a sports league in need of an app? Brian can ensure your app gets launched in the app stores. Learn more about building a sports app with Brian
Medical App
Need an app for a specialized medical or health audience? From patients managing chronic conditions to couples navigating their fertility journey, Brian has built apps that truly engage and support users. Let him create one for you. Learn more about medical app development
Contact Brian
Frequently Asked Questions:
We created an MVP app for our mobile app development agency to showcase what’s possible in under one week of development. The app includes a cost estimator, fitness module, About Us section, media player, mini-game, and more! Check it out to spark ideas for your own app’s starting point. To learn more about our process, click here.
The beauty of customized app development is that any feature or idea can be brought to life. As a senior mobile app developer, Brian has built over 20 apps—some used by millions, others as prototypes or MVPs. Always at the cutting edge, Brian’s recent projects include integrating large language models (LLMs) with mobile app interfaces.
If your app was built by an offshore development agency and isn’t performing as expected, there are a few ways to address the issue. First, conduct a quick code review to check for architectural problems, audit third-party packages, and identify the root cause. In some cases, if no obvious issues are found, it might be faster to rewrite the app entirely. For mobile app development services including new features, re-writing an existing app or fixing bugs, Brian Kayfitz can help.
If your code is written in native languages such as Objective-C and Kotlin, and you are maintaining two codebases, you have options. As a mobile app freelancer, you can either migrate your existing code to Flutter or continue adding new features in Flutter on top of your native codebase.
Developing a new app requires both time and money. The timeline depends on the app’s complexity, customization needs, and features. When starting your app development, Brian recommends building an MVP (Minimum Viable Product)—a basic version of your app designed to test the market and gather user feedback.
An MVP can take anywhere from a few weeks to several months to build, starting at a few thousand dollars but potentially scaling higher depending on requirements. You can also use an MVP app calculator to get a more precise estimate. To get your MVP build by an app development agency in Toronto, contact Brian Kayfitz.
The main advantage of outsourcing app development is faster time to market and access to specialized skill sets. Your team may lack the expertise to develop an app quickly and efficiently. However, with mobile app training and mentorship offered by Brian Kayfitz, you can upskill your team to build high-quality apps that perform smoothly. This can include mentorship sessions for junior developers and thorough code reviews for any new features your programmers are working on.
Vibe coding is when, instead of writing code yourself, you use AI to generate code from natural language prompts.
As a Flutter mobile app developer who has tested vibe coding, I’ve found it doesn’t scale well. While it can be useful for quickly creating prototypes, it’s not ideal for building sustainable, high-quality apps.
It often doesn’t save time because the generated code usually needs significant updates before it’s ready for release. Additionally, the code may contain risks or quality issues that could lead to rejection by the App Store.
As a mobile app freelancer, Brian is available to build new app ideas, add features to existing apps, train developers, and manage development teams through code reviews and problem-solving.
Brian has been a mobile app mentor for over 5 years, helping more than 100 developers of all skill levels. If you’re facing issues with your codebase, need training on best app development practices, or are stuck on a problem, Brian can help.
Yes! With the latest advances in LLM models, you can enhance your app’s functionality by adding AI capabilities. These can range from a customized travel itinerary feature to a wine and food pairing assistant. As a mobile app development agency, we have implemented custom-built AI models and integrated them with existing LLMs and tools.
There are some fundamental differences between hiring a mobile app development agency and hiring a mobile app freelancer.
The advantages of working with an agency include access to multiple developers, design services, and testers. However, agencies can be expensive, may take longer to develop your app, and sometimes have a narrower focus.
Hiring a freelancer usually means working with a senior developer who will be the sole person handling your codebase. A freelancer can also train your existing developers and collaborate alongside your team. So, if you’re building an app in-house but need extra help to launch it on the app stores, a freelancer is often the best choice.
Another option is offshore mobile app development companies. They typically charge lower hourly rates than North American developers, but the quality may vary, and you might end up paying more in the long run due to potential issues.
As a mobile app freelancer, Brian has no minimum commitments or retainers. He’s happy to do code reviews, develop specific features, or help solve any programming challenges your team is facing. He’s also available to discuss your app’s architecture, tech stack, or any strategic questions you may have.
As a mobile app freelancer, I don’t charge an hourly rate. Instead, pricing is based on what your project needs. If you’re building an MVP, prices typically start at $5,000 USD as a flat rate and scale depending on the complexity of the app. For one off tasks, bug fixes, tutoring or mentoring, I typically charge a flat rate of $150 USD.