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English
$
USD
I will fix bugs and maintain your mobile or web app
Simon Dziak
5.0
5.0
About this gig
One bug that won't go away? A build that fails, a login loop, a webhook dropping events, an API throwing errors, or a broken screen. I find the root cause and fix it at a fixed price.
Diagnosis comes first: the root cause with evidence, plus a fixed repair quote that's credited if you continue. The fix arrives as a pull request with a regression test and notes. Maintenance keeps it that way every month.
I work in a test environment and never touch production data without your written approval. You keep the code.
Stacks: Flutter, Swift, Kotlin, React, Vue, Node.js and Firebase.
Not included: new features, rewrites, or guaranteed store approval.
Get to know Simon Dziak
Simon Dziak
Mobile And Web Developer
- FromUnited States
- Member sinceAug 2020
- Avg. response time1 hour
- Last delivery10 months
Languages
English, Polish
I'm Simon, founder of App369 in Florida. I build mobile apps, web apps, backends and AI features, and I built and run Workspace369, a SaaS with a web app and mobile apps. I work in writing, at fixed prices, and you keep the code.
My Portfolio
FAQ
What do you need?
Repo access, the exact error or a recording, and steps to reproduce.
Production access?
Not needed. I use a test project or emulators.
What if it's more than one bug?
The diagnosis quotes each one separately.
Can you fix an app built with AI tools like Lovable, Replit, Cursor or Base44?
Yes, as long as I can access the code, for example through GitHub. I find the root cause and fix it with a test, so the bug is caught if it comes back.
Reviews
9 reviews for this Gig
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| (0) | ||
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Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
Sort By
Most relevant
J jasonkrohn
United States
Well done, highly recommended
$50
Price
2 days
Duration
Helpful?M markksantos
United States
Ongoing collaborationAmazing experience!
$50
Price
Helpful?R rebeccamorris28
United States
Ongoing collaborationGreat work! Szymon helped our mobile app concept come to life and we are very pleased with the outcome. He was great to communicate with throughout the process, making himself available when I needed him, and was quick to respond to feedback. We will definitely use him again. Thanks Szymon!
$2,500-$5,000
Price
S 
Seller's Response
Helpful?M markksantos
United States
Ongoing collaborationAmazing experience!
$50
Price
S Seller's Response
Helpful?M markksantos
United States
Ongoing collaborationThank you again, Simon, for another QUICK and SATISFACTORY delivery! I highly recommend this seller because he is fantastic! I'm also coming back to buy more services. My requests were a bit over the roof, but his understanding of the task is mouthwatering. Once I saw his delivery, I approved it immediately....
$50
Price
S Seller's Response
Helpful?
Reviews
9 reviews for this Gig
| (9) | ||
| (0) | ||
| (0) | ||
| (0) | ||
| (0) |
Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
Sort By
Most relevant
J jasonkrohn
United States
Well done, highly recommended
$50
Price
2 days
Duration
Helpful?M markksantos
United States
Ongoing collaborationAmazing experience!
$50
Price
Helpful?R rebeccamorris28
United States
Ongoing collaborationGreat work! Szymon helped our mobile app concept come to life and we are very pleased with the outcome. He was great to communicate with throughout the process, making himself available when I needed him, and was quick to respond to feedback. We will definitely use him again. Thanks Szymon!
$2,500-$5,000
Price
S Seller's Response
Helpful?M markksantos
United States
Ongoing collaborationAmazing experience!
$50
Price
S Seller's Response
Helpful?M markksantos
United States
Ongoing collaborationThank you again, Simon, for another QUICK and SATISFACTORY delivery! I highly recommend this seller because he is fantastic! I'm also coming back to buy more services. My requests were a bit over the roof, but his understanding of the task is mouthwatering. Once I saw his delivery, I approved it immediately....
$50
Price
S Seller's Response
Helpful?
