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I will develop web mobile app scalable aws ui ux design development
Marcin Walczyk
Vetted Pro
Top Rated
5.0
5.0
What people loved about this freelancer
petermostis
Germany
I'm excited to work with Marcin in the future! He delivered the work that my previous Germany-based app development agency couldn’t handle! If you're in doubt,...
learnmachine
United States
Marcin is the best. He is a very discriplined, efficient, to the point person. Who takes ownership of the project and keeps the project moving. Great at communication and organization.
karimguettache
Netherlands
What really stood out during my consultation with Marcin was how much he genuinely cared about our business goals. His solution wasn’t just about fixing the...
marten_eyferth
Germany
The development team performed excellently during the discovery phase, providing priceless guidance and insights. Then they quickly upgraded our app, fixing...
viktoriyamart
Canada
It's rare to find somebody with deep knowledge about development, UX design and marketing of mobile apps. Marcin took the time to answer all of my questions and address my concerns. Amazing consultation!
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 time4 hours
- Last delivery2 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
By working with Inventively LLC 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.
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.
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
35 reviews for this Gig
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Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
Sort By
Most relevant
R 
reachgiant
United States
Working with Marcin was honestly a great experience. He and his team think long term, ask the right questions, and genuinely care about outcomes that matter. The level of business awareness and reliability really stands out.
$1,000-$1,500
Price
2 weeks
Duration
Helpful?T 
timh80
Repeat Client
United Kingdom
Great experience with the team. They helped with our iOS and Android app development, and the quality of their work was excellent. I highly recommend them.
$1,000-$1,500
Price
10 days
Duration
Helpful?L 
lucabisacchi
Repeat Client
United Kingdom
I had another session with Marcin and his senior team member, and as always, it exceeded expectations. Their clarity, honesty, and deep technical understanding make every consultation genuinely valuable. Highly recommended.
$200-$400
Price
12 days
Duration
Helpful?K 
karimguettache
Repeat Client
Netherlands
The contribution from the team to our SaaS web app was excellent. They focused on scalability and ensured the project can handle future growth without technical barriers. Thanks Marcin!
$2,000-$3,000
Price
2 weeks
Duration
Helpful?W willlee952
Canada
Inventively team improved my app to support a growing number of users. The updates provide better data tracking and insights into how users interact with the app. It’s great having such a reliable tech partner! Thank you!
$1,000-$1,500
Price
13 days
Duration
Helpful?
Reviews
35 reviews for this Gig
| (35) | ||
| (0) | ||
| (0) | ||
| (0) | ||
| (0) |
Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
Sort By
Most relevant
R reachgiant
United States
Working with Marcin was honestly a great experience. He and his team think long term, ask the right questions, and genuinely care about outcomes that matter. The level of business awareness and reliability really stands out.
$1,000-$1,500
Price
2 weeks
Duration
Helpful?T timh80
Repeat Client
United Kingdom
Great experience with the team. They helped with our iOS and Android app development, and the quality of their work was excellent. I highly recommend them.
$1,000-$1,500
Price
10 days
Duration
Helpful?L lucabisacchi
Repeat Client
United Kingdom
I had another session with Marcin and his senior team member, and as always, it exceeded expectations. Their clarity, honesty, and deep technical understanding make every consultation genuinely valuable. Highly recommended.
$200-$400
Price
12 days
Duration
Helpful?K karimguettache
Repeat Client
Netherlands
The contribution from the team to our SaaS web app was excellent. They focused on scalability and ensured the project can handle future growth without technical barriers. Thanks Marcin!
$2,000-$3,000
Price
2 weeks
Duration
Helpful?W willlee952
Canada
Inventively team improved my app to support a growing number of users. The updates provide better data tracking and insights into how users interact with the app. It’s great having such a reliable tech partner! Thank you!
$1,000-$1,500
Price
13 days
Duration
Helpful?
