Kostiantyn Rybalka
I am an experienced Flutter developer with over 7 years of experience and a diverse project background. I am also a devoted team lead, guiding small Flutter teams for over 2 years.
About
I am an experienced Flutter developer with over 7 years of experience and a diverse project background. I am also a devoted team lead, guiding small Flutter teams for over 2 years.
My focus in application development has been primarily on iOS and Android platforms, utilizing the Flutter framework. Apart from client side application design and logic, I have a lot of experience mentoring small teams of Flutter developers, making sure their code quality is in line with the best industry practices and helping them find the most plausible solution if they get stuck on a problem or need any advice. In some cases, I have also participated in estimating the complexity of individual tasks and even entire projects.
In my LinkedIn profile, you can find more information about my previous work experience, as well as some side projects I have been working on in my free time. Check it out: Website not available. Sign in: https://www.twine.net/signup
I am passionate about developing impactful products, and if you have one, I hope I will be a good fit for your team.
- 8 years' experience
- Joined April 2026
Industry experience
- Software & Internet
- Media & Entertainment
- Education
- Financial Services
- Travel & Hospitality
More experts in Valencia, Spain
Work experience· 5 roles
Led a small Flutter development team to build a remote monitoring and AI-driven run-tracking application. Responsibilities included training plan structure implementation, run-tracking adjustments, multi-location security monitoring concepts, complex entity-type filters, and custom sign-in functionality. Ensured code quality aligned with industry standards, mentored teammates, and estimated and distributed work across developers.
Developed the Heylol app as a senior Flutter developer for a social messenger with video carousel and gamification elements; implemented major system modules: auth, chat, media, explore, profile, wallet, tasks, gifts. Mentored junior and mid-level developers; used Dart/Flutter for client-side and Firebase Cloud Functions with Node.js for server-side logic; utilized Cloud Firestore for data storage; developed for Android and iOS; conducted unit, widget and integration testing; implemented modular authentication for reusability; app documentation and localization for English and Russian.
Developed the Heylol app (social messenger with video carousel and gamification). Implemented core modules (auth, chat, media, explore, profile, wallet), and coached junior/mid-level developers. Used Dart/Flutter for client-side and Firebase Cloud Functions (Node.js) for server logic; Cloud Firestore for data storage. Built for Android and iOS, implemented in-app purchases and native/ad integrations, and performed unit, widget, and integration testing. Localized app for English and Russian; implemented advanced routing with goRouter. Applied thorough documentation, multi-platform readiness, and robust routing, state restoration, and external sharing support.
Education
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