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I will develop mobile app ios android web development ui ux design
Marcin Walczyk
Vetted Pro
Top Rated
5.0
5.0
What people loved about this freelancer
kckatcreative
United States
We are an established business with a subscription payment model. We needed a professional design and software development company to continue improving our...
cashflowempire
United States
Great experience! Marcin's team did a detailed code review and made a solid plan to refactor our legacy code. Additionally, they identified and resolved one...
hugoalmeida825
United Kingdom
I'm no tech guru, but this team made the process a breeze! They've added a mobile payment system to my app. They took care of everything, including the design,...
carolgaus
Spain
Switched to this mobile app development firm after our previous one couldn't track marketing efforts effectively. Initial consulting with Marcin was a game-changer...
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 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 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.
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
59 reviews for this Gig
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Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
Sort By
Most relevant
N 
nystroemdigital
Repeat Client
Norway
Really good call with Marcin. Felt like talking to a trusted advisor. Gave us clarity straight away. Appreciate it and would definitely recommend!
$200-$400
Price
6 days
Duration
Helpful?S 
sinamarketing
Canada
Marcin and the team delivered exactly what I needed, on time and without friction. Communication was clear, and they took ownership, making the process smooth.
$600-$800
Price
9 days
Duration
Helpful?G gabriellee6
Canada
Inventively was a great partner from the first interaction. Marcin kept things clear and business-focused, without overcomplicating anything. The collaboration felt easy, efficient, and aligned with how we like to work.
$1,500-$2,000
Price
2 weeks
Duration
Helpful?N nystroemdigital
Repeat Client
Norway
Excellent consultations, very insightful and practical, thank you again.
$400-$600
Price
9 days
Duration
Helpful?C 
compoundgroup
Repeat Client
Spain
Very strong experience and a calm, confident approach. Marcin looks beyond the immediate task and focuses on scalable solutions and strategy. I appreciated his time, honesty, and the feeling of working with someone truly invested.
$400-$600
Price
2 weeks
Duration
Helpful?
Reviews
59 reviews for this Gig
| (59) | ||
| (0) | ||
| (0) | ||
| (0) | ||
| (0) |
Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
Sort By
Most relevant
N nystroemdigital
Repeat Client
Norway
Really good call with Marcin. Felt like talking to a trusted advisor. Gave us clarity straight away. Appreciate it and would definitely recommend!
$200-$400
Price
6 days
Duration
Helpful?S sinamarketing
Canada
Marcin and the team delivered exactly what I needed, on time and without friction. Communication was clear, and they took ownership, making the process smooth.
$600-$800
Price
9 days
Duration
Helpful?G gabriellee6
Canada
Inventively was a great partner from the first interaction. Marcin kept things clear and business-focused, without overcomplicating anything. The collaboration felt easy, efficient, and aligned with how we like to work.
$1,500-$2,000
Price
2 weeks
Duration
Helpful?N nystroemdigital
Repeat Client
Norway
Excellent consultations, very insightful and practical, thank you again.
$400-$600
Price
9 days
Duration
Helpful?C compoundgroup
Repeat Client
Spain
Very strong experience and a calm, confident approach. Marcin looks beyond the immediate task and focuses on scalable solutions and strategy. I appreciated his time, honesty, and the feeling of working with someone truly invested.
$400-$600
Price
2 weeks
Duration
Helpful?
