I'm Sergii Bilak — a software engineer building apps that people love on iOS and Android.
From fitness coaching to puzzle games — each app is crafted with care for great user experience.
Versatile software engineer with expertise across the full development lifecycle. I build cross-platform mobile apps for iOS and Android, with a focus on integration, performance, and polished user experience.
My apps span health & fitness, gaming, e-commerce, and education — each one designed to solve real problems and delight users.
If you have questions, issues, or feedback about any of my apps, I'm here to help.
Have a question about how an app works, its features, or compatibility? Send me a message and I'll get back to you as soon as possible.
Found a bug or something not working as expected? Please describe the issue, your device model, and OS version so I can investigate and fix it quickly.
Have an idea for a new feature or improvement? I love hearing from users — your feedback directly shapes future updates.
Questions about your data, privacy, or account? I take your privacy seriously. Reach out and I'll address your concerns promptly.
Reach out directly at [email protected] — I typically respond within 24–48 hours.
Have a project idea, partnership proposal, or just want to say hi? Drop me a message.