Ulmasbek Rakhmatullaev
@ulmasbekrakhmatullae
Senior Flutter developer building secure fintech authentication SDKs and scalable cross-platform apps.
What I'm looking for
I’m a Senior Flutter Developer with 5+ years of experience building production-grade cross-platform applications and developer SDKs. I architected a multi-bank authentication SDK now serving 20,000+ MAU across iOS, Android, and Web.
At Payfintech, I built and owned the Flutter engineering layer of the Pully authentication SDK integrated by 4 major Uzbek banks. I implemented Passkeys, MyID biometric verification, and secure token-based auth flows, reducing user login friction by 40%, while designing for rapid onboarding of new banking partners.
I’ve also led delivery as a team of 8 engineers, shipped 13 production apps, and improved reliability to 99.5% crash-free sessions using Firebase Crashlytics and Sentry. From AI consumer apps with $8,000 MRR impact to hardware-integrated warehouse apps via Platform Channels, I focus on robust architecture, fast iteration, and clean engineering practices.
Experience
Work history, roles, and key accomplishments
Senior Flutter Developer
Payfintech
Jan 2024 - Present (2 years 5 months)
Built and owned the Flutter engineering layer of Pully, a cross-platform authentication SDK integrated by 4 major Uzbek banks, serving 20K+ MAU across iOS, Android, and Web. Implemented Passkeys and MyID biometric verification and delivered token-based auth flows, reducing user login friction by 40%.
Senior Flutter Developer
Suponoholdings
Dec 2024 - Aug 2025 (8 months)
Worked as the primary Flutter engineer on multiple AI-powered consumer apps, delivering cross-platform AI chat and image/video generation experiences. Drove revenue impact with a flagship app reaching $8,000 MRR and contributed to 3+ apps across the portfolio.
Senior Flutter Developer
Eriell
May 2023 - Jan 2024 (8 months)
Built Android-based warehouse management apps and integrated barcode scanners and thermal printers via Platform Channels for manufacturing facilities. Implemented CI/CD with Fastlane and GitLab CI to cut release cycle time by over 60%, and improved production reliability with Firebase Crashlytics and Sentry (99.5% crash-free sessions).
Middle Flutter Developer
Vention
Jan 2022 - Apr 2023 (1 year 3 months)
Delivered internal tooling for a global workforce by building an employee platform with Single Sign-On (SSO) integrated across the product ecosystem. Participated in agile ceremonies and maintained a strong code-quality culture by averaging 2 pull request reviews per day.
Flutter Developer
4ride.pl
Sep 2021 - Jan 2022 (4 months)
Solely designed and built a Flutter sports equipment marketplace app end-to-end, including product listings, user authentication, and purchase flows. Collaborated directly with the client to translate requirements into technical implementation and deliver on schedule.
Flutter Developer & Team Lead
UIC Group
May 2020 - Jan 2022 (1 year 8 months)
Led a team of 8 Flutter developers, mentored 5+ junior engineers, and established Flutter best practices adopted as company-wide standards. Shipped 13 production applications and increased delivery capacity by 40% by optimizing workflows, while integrating Android native modules (Java/Kotlin) via Platform Channels.
Education
Degrees, certifications, and relevant coursework
Inha University
Bachelor of Science, Computer Science
2016 - 2020
Grade: 3.60 / 4.00
Earned a B.Sc. in Computer Science from Inha University (Tashkent). Graduated with a GPA of 3.60/4.00.
Availability
Location
Authorized to work in
Job categories
Skills
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