
Roman K.
Mobile App Developer, USD 1M Launch in 2 weeks, 3M Downloads
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Freelance Mobile App Developer
Upwork • Freelance
Aug 2019 - Present • 6 yrs 9 mos
Over 30 mobile apps designed, built, and published across App Store and Google Play since 2019. Specializing in Flutter and Firebase, with additional experience in Kotlin, Swift, Node.js, and React. Projects range from MVPs for early-stage startups to full-scale production apps with millions of users. Industries served include streaming (2.7M+ downloads), MedTech (AI-powered skin cancer detection), edutainment (co-founded by Chris Ludacris Bridges), FinTech, food and restaurant, recruitment, IoT, sports, social networking, and more. Key results delivered for clients: - $1M+ revenue generated within 2 weeks of app launch - 2.7M+ downloads for a cross-platform streaming service - $300k raised by a client using the product I built - $220k first-year revenue for a sports team management app - Partnership secured with Ferrotec ($1B+ market cap) through an IoT tablet app - Multiple app rescues where previous developers failed and projects were saved without a full rebuild I manage full project lifecycles - from initial discovery and UX design through development, QA testing, and App Store submission. Most clients spend under 30 minutes per week on oversight while I handle everything else. Typical engagement: 8-12 weeks from kickoff to published app. Fixed-price, milestone-based contracts. Weekly progress updates. Certified by Meta (iOS Development), IBM (iOS and Android Mobile App Development), and Google Cloud (Firebase and Cloud Functions).