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I will develop mobile web ai app saas development figma designer
Marcin Walczyk
Vetted Pro
Top Rated
5.0
5.0
What people loved about this freelancer
abdeldzns
United States
Generating over $1M in web app revenue, our business is in a strong position. Yet our retention is low so we decided to create a mobile app too. We had consultations...
motokaii
Croatia
Valuable investment! We started with a paid discovery phase which reshaped our initial ideas, producing a project scope and estimates. Guidance on UX design, tech and business was very helpful.
willfromtoronto
Canada
I can recommend Marcin's development firm. They are transparent about their processes, pricing, and progress, and they take responsibility for the success of...
Vetted by Fiverr Pro
Marcin Walczyk was selected by the Fiverr Pro team for their expertise.
About this gig
At Inventively LLC, we build high-stakes, end-to-end apps for web, mobile, AI, and hardware. With 10+ years of expertise, we help entrepreneurs and organizations turn ideas into scalable, revenue-driving products.
Our projects typically range from $20k to $100k and run 1 to 5 months. We cover the full cycle: product workshops, UI/UX design, scalable architecture, development, and long-term support. Clients have achieved over $2,000,000 per year in in-app purchases under our guidance.
We are an official RevenueCat technology partner, a San Francisco company valued at $500M with $100M+ raised, powering over $8B in annual transactions. This gives our clients proven subscription monetization and growth strategies.
We specialize in profitable software businesses that last. Mobile and web apps, AI solutions, hardware integrations, payments and cloud systems, and reliable maintenance.
Kindly contact me: Contact seller -> Ask a question.
Get to know Marcin Walczyk
Marcin Walczyk
Vetted Pro
We build profitable software businesses: Marcin, CEO Inventively LLC
Top Rated
Marcin Walczyk is part of the Fiverr Pro catalog and has been hand-picked by a dedicated Fiverr Pro team for their skills and expertise.
Vetted for
Mobile App Development
Mobile App Maintenance
- FromUnited States
- Member sinceFeb 2019
- Avg. response time3 hours
- Last delivery3 weeks
Languages
English
Build scalable mobile, web, AI, and computer vision apps with a top-tier engineering team at your side. Leverage our expertise in development, design, payments, and marketing integrations.
As an official RevenueCat technology partner, a San Francisco-based startup that has raised over $100 million in funding, is valued at $500 million, and powers a platform processing over $8 billion annually, we're ready to help you achieve great success.
We build long-term partnerships with entrepreneurs who need a reliable tech team to deliver and maintain the software behind their growing business.
My Portfolio
FAQ
Can you sign in an NDA? ( Non-disclosure agreement )
Absolutely. We value confidentiality. I encourage NDAs and can use yours or provide our template. Rest assured, only essential team members access your data, ensuring your project's security and peace of mind.
By working with Inventively will I get direct contact with Marcin?
Yes, by working with Inventively, you'll have direct contact with Marcin. His unique expertise in transforming app businesses into profitable entities ensures your project receives the best guidance. We take on a limited number of projects, ensuring you get the dedicated focus you deserve.
Do you provide support and maintenance after development and launch?
Yes, we provide ongoing support and maintenance to ensure your app's success and scalability. Our goal is to build lasting partnerships, offering continuous improvements, updates, and dedicated issue resolution to keep your app at the forefront.
What kind of access and control will I have over my project during development?
As our client, you will have real-time access to project progress, budget management, and goal status, ensuring full transparency and control at every step.
Do I have ownership of my mobile application, including the code?
Yes, you are the owner of Intellectual Property rights at all times.
Will you assist me in uploading my Android app to the Google Play Store? / my iOS app to the Apple Store? How?
Yes, of course. We will upload your Android application to the Google Play Store and your iOS app to Apple Store. It is also a part of our app development process. We will also guide you through the app setup on the stores regarding the marketing materials and descriptions.
Reviews
12 reviews for this Gig
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Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
Sort By
Most relevant
M 
macedomarketing
Repeat Client
United States
Inventively handled a small but tricky task for us and nailed it. Their attention to detail and professionalism proved they’re the right partner for bigger projects too. Great job!
$1,000-$1,500
Price
12 days
Duration
Helpful?G 
growyourprofit
Mexico
Marcin and his team are the kind of partners I hoped to find. Their tech expertise and ability to spot issues before they become problems saved us serious time and money. I’d recommend them to anyone looking for a dependable long-term development partner.
$3,000-$4,000
Price
4 weeks
Duration
Helpful?E eduardo_c_seo
Spain
The consultation call was extremely helpful. Marcin was professional, insightful, and focused on real business solutions, showing how technology can solve challenges and automate processes effectively.
$200-$400
Price
3 weeks
Duration
Helpful?Z 
zvipotnik
Repeat Client
Slovenia
Inventively mapped out an AI-driven app using location data. Their process was clear, well-organized, and far better than working with freelancers. If you want structured development and reliable results, go with them!
$1,000-$1,500
Price
3 weeks
Duration
Helpful?C 
carolgaus
Repeat Client
Spain
Marcin's team solved a tech problem for me that other developers couldn’t finish. Amazing!
$400-$600
Price
13 days
Duration
Helpful?
Reviews
12 reviews for this Gig
| (12) | ||
| (0) | ||
| (0) | ||
| (0) | ||
| (0) |
Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
Sort By
Most relevant
M macedomarketing
Repeat Client
United States
Inventively handled a small but tricky task for us and nailed it. Their attention to detail and professionalism proved they’re the right partner for bigger projects too. Great job!
$1,000-$1,500
Price
12 days
Duration
Helpful?G growyourprofit
Mexico
Marcin and his team are the kind of partners I hoped to find. Their tech expertise and ability to spot issues before they become problems saved us serious time and money. I’d recommend them to anyone looking for a dependable long-term development partner.
$3,000-$4,000
Price
4 weeks
Duration
Helpful?E eduardo_c_seo
Spain
The consultation call was extremely helpful. Marcin was professional, insightful, and focused on real business solutions, showing how technology can solve challenges and automate processes effectively.
$200-$400
Price
3 weeks
Duration
Helpful?Z zvipotnik
Repeat Client
Slovenia
Inventively mapped out an AI-driven app using location data. Their process was clear, well-organized, and far better than working with freelancers. If you want structured development and reliable results, go with them!
$1,000-$1,500
Price
3 weeks
Duration
Helpful?C carolgaus
Repeat Client
Spain
Marcin's team solved a tech problem for me that other developers couldn’t finish. Amazing!
$400-$600
Price
13 days
Duration
Helpful?
