Skip to content
BackNov 7
Stepan K.
Upwork badge

Stepan K.

Mobile App Developer & UI/UX Designer | React Native | AI

🏆 Senior AI Mobile Full-Stack developer. Trusted by startups and global brands like IMAX. 🌟 Only 5-star verified reviews. 🇪🇺 European quality. 🧑🏻‍💻 Founder of VibeMeal - AI calorie tracking app ($40K MRR) Hello, I'm Stepan, a Senior Full-Stack developer/Mobile App Developer. With over 6 years of experience in the web and mobile development industry, and AI-driven development industry, I have personally led 40+ successful projects, delivering exceptional results for my clients. What clients say about me: 🌟 "Stepan was great. He worked on the form in a timely manner, and was very patient when I couldn't get back to him quickly. The communication was great, his work is excellent, and I will most definitely work with him in the future again." 🌟 "Wonderful person. Focused and dedicated to tasks." 🌟 "Stepan is very responsible developer. Not only he did the job before the deadline, he also did even more work to simplify the upcoming app integrations, thank you. Highly recommended!" So far I’ve: - Worked with clients in a wide diversity of domains: healthcare, catering delivery, travel agency services, education, sales and marketing, vehicles, metals & mining. - Collaborated with customers 🌏 worldwide: Europe (United Kingdom, Germany, Belgium, Croatia, Slovakia, Estonia, France, Norway), USA, and Australia. - Worked with inspired 🚀startups & enterprise companies. My services: - Mobile App Development - Develop Website - Build Mobile Application - MVP development - Build Marketplace - Develop Chrome extension - Hybrid Development - Build Prototype Here are my core skills: 🎯 Frontend: - React - TypeScript / JavaScript - Next / Gatsby / SPA - Web3 - REST / GraphQL - Cypress Backend: - Express / Nest - AWS Serverless - MongoDB / DynamoDB - MySQL, PostgreSQL - Firebase - AI integration (OpenAI, LangChain, TensorFlow) Mobile development: - React Native - Flutter - Firebase Infrastructure: - AWS - GCP - Terraform - Docker - CI/CD AI & Automation: - AI chatbots & assistants - AI-driven automation for workflows - Computer vision & NLP features Web3: - Truffle - Web3 - Solidity VR/AR: - Unity Reach out to me today, and let's establish a long-lasting and fruitful collaboration. 🤝 Don't hesitate to get in touch right away! ✉️ Keywords to find me: Mobile App Development, Claude Code, Cursor, Smartphone, Android, Android App Development, Dart, Expo, Firebase, Firetime Realtime Database, Flutter, FlutterFlow, Hybrid App Development, In-app Purchases, iOS, iOS Development, Java, Kotlin, Native App Development, Push Notifications, React Native, Swift, User Authentication, UX Design, Node.js, AI Mobile App Development, AI Chatbots, AI Automation, AI Assistant, OpenAI, ChatGPT

🇸🇰Bratislava, Slovakia$35/hr100% JSS5.00 (23)Since Apr 2019
GlobeUpwork

Earnings and projects

MRR
$11k

Last 6 months ÷ 6

World#1,116 / 412k
🇸🇰Country#1 / 323
Revenue, last 30 days
$5.3k

Last 6 months: $64k

World#5,078 / 412k
🇸🇰Country#5 / 323
Total earnings
$204k

Billed in all: $215k

World#14,866 / 412k
🇸🇰Country#23 / 323
Per project
$5.1k

$5.8k in the last 6 months

World#34,115 / 412k
🇸🇰Country#35 / 323
Projects, last 6 months
11
36% fixed64% hourly
World#15,931 / 412k
🇸🇰Country#11 / 323
Projects in all
40
50% fixed50% hourly
World#75,668 / 412k
🇸🇰Country#59 / 323

Earnings, last 30 days

$215k+$5.3k earned in the last 30 daysBilled in all, before Upwork's fee · drag across the chart to see what was earned in any stretch
$205k$210k$215k$220kOct 8Oct 23Nov 7

Skill rankings: Top 0.31% in Mobile UI Design

Top 1% in 18 of 20 skills, ranked by MRR among everyone on Upwork with the skill.

  1. #8Expo.io581 freelancers · 🇸🇰 #1Top 1%
  2. #8iPad App Development446 freelancers · 🇸🇰 #1Top 2%
  3. #9Smartphone995 freelancers · 🇸🇰 #1Top 0.90%
  4. #13Mobile UI Design4,166 freelancers · 🇸🇰 #1Top 0.31%
  5. #17Mobile App Design5,198 freelancers · 🇸🇰 #1Top 0.33%
  6. #20User Experience Design5,749 freelancers · 🇸🇰 #1Top 0.35%
  7. #22User Interface Design6,795 freelancers · 🇸🇰 #1Top 0.32%
  8. #22iOS3,908 freelancers · 🇸🇰 #1Top 0.56%