Hire the Best Bitcoin Developers
in Ukraine
Kyiv, Ukraine
Want smarter automation, better user engagement, and AI-powered growth? Send me your idea and Iโll break it down into a clear AI Chatbot Development strategy with quick wins and scalable long-term architecture. Iโll also explain how professional AI Agent Development, and marketing can actually generate revenue ๐ค ๐น 18+ years of programming experience (since 2006) ๐น 100+ chatbots / ai agent built | 40+ Blockchain projects ๐น Fast, clear communication & startup-friendly mindset ๐น Trusted by global clients & multiple chatbot startups ๐น AI Agent Developer | AI Chatbot Developer | Telegram Bot Expert | Web Developer Iโm a senior ai agent developer / ai chatbot developer specializing in AI chatbot, AI platforms, AI solutions for Crypto and automation-driven businesses. My work focuses on building production-ready AI Chatbot (s), AI Agent (s), AI RAG, AI assistants, autonomous agents, Telegram trading bots, and crypto Telegram bots that scale securely and reliably. Whether you need website chats, voice AI agent, customer support automation, Telegram bots, Slack bots or advanced AI RAG systems, my approach ensures real business impactโnot just demos. ๐ AI Results Iโve Delivered โข 100+ chatbots deployed across websites, Telegram, and Slack โข AI Chatbot Development reducing human support workload by 60%+ โข AI Agent Development projects automating customer support and lead generation โข Telegram bots handling thousands of concurrent users โข RAG chatbot systems for SaaS platforms and internal knowledge bases โข AI workflow automation and AI-powered business process automation โข 40+ Blockchain-related chatbot projects (DeFi, wallets, payments) ๐ Why Clients Choose My Services โญ 18+ years of real-world programming experience โญ Deep expertise in Artificial Intelligence, Generative AI, machine learning, and NLP โญ Business-first mindset focused on ROI โญ Strong experience with Crypto, Web3, SaaS, and AI startups โญ Reliable delivery of production-grade ai chatbot and AI agent systems โญ Practical deployments for customer support (Tidio) and lead generation (Conversiobot) ๐ง Core Skills & Technologies AI Chatbot Developer Stack ๐น Artificial Intelligence & machine learning ๐น Generative AI & Large Language Models (LLM) ๐น Natural Language Processing (NLP) ๐น LangChain, LangGraph, CrewAI, AutoGen ๐น AI RAG chatbot & Knowledge Base AI ๐น Multi-agent & AI Agent Developer services ๐น OpenAI, Claude, Gemini, GPT integrations ๐น DialogFlow, ManyChat, Botpress ๐น Website chat, Telegram bot, Slack bot, Discord bot ๐น AI sales agent and deal closer chatbots Frameworks / Databases ๐น Python, PHP, JavaScript ๐น Flask, FastAPI, Node.js ๐น FAISS, Chroma, Pinecone, Weaviate ๐น MySQL, PostgreSQL, MongoDB ๐น React ๐ Full-Spectrum AI Chatbot Development Services ๐น AI Agent Development and AI workflow automation ๐น RAG chatbot system for private data & SaaS ๐น Website chatbot, Slack bot & Discord bot ๐น Business automation and AI integration ๐น Etsy marketing and Pinterest marketing ๐น API integration & admin dashboard ๐น Blockchain & Web3 chatbot ๐น AI Agent automation & conversational workflow ๐ฏ Specialized AI Chatbot Development โญ AI customer support & lead gerenation โญ SaaS & product assistant โญ Internal AI RAG โญ AI Agent Developer for startups and enterprises โญ Crypto / Blockchain Telegram trading bots Blockchain ๐น Solidity, Hardhat ๐น BTCPay Server ๐น Crypto Telegram bots & Telegram trading bots ๐ Advanced AI Agent Development I donโt just โbuild botsโ โ I engineer intelligent systems. My AI Chatbot Developer process starts with understanding user intent and business goals, followed by conversation design, model selection, AI Agent Development, and scalable backend architecture powered by machine learning models. Using LangChain, LangGraph, FastAPI, vector databases, and modern AI pipelines, I build AI Agents that reason, retrieve data, execute workflows, and take action. As a senior AI Chatbot Developer / AI Agent Developer, my focus is reliability, security, and measurable resultsโespecially for growth-focused chatbot marketing and business automation use cases. ๐น For SaaS & AI platforms, I build AI RAG chatbot solutions that answer accurately from private data. ๐น For startups, I provide MVP-focused AI Chatbot Development that scales smoothly. ๐น For Crypto projects, I deliver chatbots integrated with smart contracts and payment systems. ๐ Chatbot Development Toolkit Python, PHP, JavaScript, Flask, FastAPI, Node.js, React, LangChain, LangGraph, AI RAG, NLP, OpenAI, Claude, Gemini, FAISS, Chroma, Pinecone, DialogFlow, ManyChat, GPT integrations, Telegram, Slack, Discord, PostgreSQL, MongoDB, AI Agent Developer, Telegram trading bot and crypto Telegram bot. ๐ฉ If youโre looking for a senior AI Chatbot Developer / AI Agent Developer specializing in AI Chatbot Development, AI RAG systems and conversion-focused ai chatbot solutions, letโs talk. I build intelligent systems that actually work โ and scale.
- Python
- Chatbot Development
- Natural Language Processing
- Chatbot
- Bot Development
- Artificial Intelligence
- Node.js
- PHP
- Machine Learning
- React
- Deep Learning
- JavaScript
- PyTorch
- TensorFlow
- WordPress
- Data Analysis
- Blockchain
- Data Science
- Neural Network
- Generative AI
Dnipro, Ukraine
7+ ๐ฒ๐๐๐ซ๐ฌ of building crypto wallets, DeFi apps & fintech platforms - from idea to App Store. If you're launching a crypto wallet, DeFi mobile app, trading platform, or fintech product - you're in the right place. I specialize in React Native mobile development for the crypto and fintech space. I don't just write code - I help you ship a product that users actually want to open every day. ๐๐ก๐๐ญ ๐ ๐๐ฎ๐ข๐ฅ๐ Crypto Wallets - custodial and non-custodial wallets for iOS and Android. Multi-chain support: Ethereum, Solana, TON, BSC, Polygon, TRON and other EVM chains. DeFi and Web3 Mobile Apps - DEX integrations, staking dashboards, yield farming UIs, token swaps, NFT portfolios - all connected to smart contracts via Web3.js and Ethers.js. Fintech Mobile Apps - payment systems, digital wallets, P2P transfers, real-time transaction monitoring, KYC flows, and open banking integrations. Trading Bot Interfaces - mobile frontends for algorithmic trading systems, CEX/DEX dashboards, real-time PnL tracking, copy trading UIs. Smart Contract Integration - connecting your mobile app to Solidity (EVM) or FunC (TON) smart contracts. Secure, tested, production-ready. Crypto Exchange Apps - full-featured exchange interfaces with order books, real-time charts, wallet management, and API integrations (Binance, Bybit via CCXT). ๐๐๐๐ก ๐๐ญ๐๐๐ค On the mobile side I work with React Native, building cross-platform iOS and Android apps with Expo. For blockchain integrations I connect to Ethereum, Solana, TON, BSC, Polygon, TRON and other EVM chains using web3.js and Ethers.js. Smart contracts - Solidity for EVM chains, FunC for TON, Rust for Solana. On the backend I use Python, Node.js, FastAPI, PostgreSQL, MongoDB, Redis and WebSockets. For automation and bots - Playwright, Selenium, aiogram for Telegram. Infrastructure runs on Docker with CI/CD via GitHub Actions. ๐๐ก๐๐ญ ๐๐๐ค๐๐ฌ ๐๐ ๐๐ข๐๐๐๐ซ๐๐ง๐ญ Most mobile developers can build a UI. I understand how crypto products work - blockchain architecture, wallet security, gas optimization, on-chain data, smart contract interaction - and I build mobile apps that handle all of it correctly. Whether you need a crypto wallet like Trust Wallet, a DeFi dashboard, a fintech MVP, or a trading bot mobile frontend - I've built products across all these verticals. Clean architecture, scalable from day one. Security-first mindset, especially critical for financial apps. Full ownership from wireframe to App Store and Google Play. Fast delivery - MVPs in 4 to 8 weeks. ๐๐๐๐๐ง๐ญ ๐๐จ๐ซ๐ค Crypto wallet with multi-chain support (EVM + TON) and biometric auth. DeFi mobile app with staking, farming, and token swap via Uniswap. Fintech platform with P2P payments, real-time ledger, and KYC integration. Telegram trading bot with mobile monitoring dashboard. ๐๐๐ญ'๐ฌ ๐๐๐ฅ๐ค ๐๐ถ๐ช๐ญ๐ฅ๐ช๐ฏ๐จ ๐ข ๐ค๐ณ๐บ๐ฑ๐ต๐ฐ ๐ธ๐ข๐ญ๐ญ๐ฆ๐ต, ๐๐ฆ๐๐ช ๐ข๐ฑ๐ฑ, ๐ฐ๐ณ ๐ง๐ช๐ฏ๐ต๐ฆ๐ค๐ฉ ๐ฑ๐ญ๐ข๐ต๐ง๐ฐ๐ณ๐ฎ? ๐๐๐ง๐ ๐ฆ๐ ๐ ๐ฆ๐๐ฌ๐ฌ๐๐ ๐ - I'll review your idea and suggest the right architecture before we write a single line of code.
- Bitcoin
- JavaScript
- React
- Node.js
- Blockchain
- Solidity
- Smart Contract
- Ethereum
- HTML
- Blockchain Development
- Python
- Blockchain Architecture
- Cryptocurrency
- HTML5
- CSS
- web3.js
- WordPress
- Angular
- PHP
- FinTech
Kyiv, Ukraine
Hey, Iโm Andrii โ a passionate, detail-oriented video editor with a sharp eye for what grabs attention and keeps it. Over the past 5+ years, Iโve helped creators across the globe produce content thatโs not just watched, but shared and remembered. My work spans over 30 clients, including creators like Filian (3M+ subs), and platforms like YouTube Shorts, TikTok, and Instagram Reels. I specialize in crafting visually captivating short-form videos that connect with audiences, tell stories, and drive engagement. Whether itโs a corporate promo, documentary, or viral social media clip, I bring imagination, precision, and creativity to every project. What I Offer: ๐น Short-Form Editing: Edits that retain attention, with strong pacing, humor, and viral timing. ๐น Motion & Sound: Dynamic motion graphics, subtitles, and polished sound design included. ๐น Software Proficiency: Skilled in Adobe Premiere Pro, After Effects, and Photoshop ๐น Creative Vision: Crafting compelling narratives and visuals that leave an impression. ๐น Collaboration & Deadlines: Consistent turnaround, smooth communication, and reliable delivery. Letโs collaborate to transform your ideas into content that doesnโt just scroll byโit sticks. ๐ฏ
- Bitcoin
- Adobe Premiere Pro
- Adobe After Effects
- Adobe Photoshop
- Video Editing
- Animation
- Social Media Video
- YouTube Shorts
- Instagram Reels
- TikTok
- Gaming Video
- Color Grading
- Motion Graphics
- Audio Editing
Kyiv, Ukraine
Top Rated | 100% JSS | 50+ Projects | SaaS & VC-Backed Startups Frontend engineer focused on building fast, scalable SaaS products that are ready for real users - not just demos. I work with startups, founders, and product teams to turn ideas, Figma designs, and existing products into polished, production-ready web apps using Vue/Nuxt and React/Next.js. Over the last 5+ years, Iโve built SaaS dashboards, internal tools, client portals, MVPs, AI tools, fintech platforms, marketplaces, and marketing platforms (multi-page websites + CMS systems) for VC-backed startups ($25M+ funding) What I can help you build: - SaaS dashboards & admin panels - MVPs for fast launch and validation - AI-integrated web applications - Fintech & analytics platforms - Internal tools & business platforms - Marketplaces & booking systems - CRM / ERP interfaces - Real-time apps with WebSockets - Mobile-ready apps with Capacitor - Landing pages with strong UX & conversion focus - Complex frontend architectures - Pixel-perfect UI from Figma - Responsive, mobile-first applications - API integrations & third-party services - Performance optimization & frontend scaling What clients value about working with me: - Clean, scalable, maintainable code - Fast communication and consistent updates - Strong product thinking, not just coding - Attention to UX, performance, and details - Ability to work independently without micromanagement - Production-focused mindset from day one - Reliable delivery and ownership of features - Focus on long-term scalability, not quick hacks I donโt just build interfaces - I help create products that feel fast, modern, and reliable for real users. Core stack: Frontend: Vue, Nuxt.js React, Next.js, TypeScript Capacitor, React Native JavaScript Pinia, Vuex, Zustand, GSAP, Three.js, Anime.js Backend & APIs: Node.js, Express, Hono Python, Django, REST APIs, GraphQL Supabase, PostgreSQL Firebase, Auth systems, Realtime data UI & Performance: Tailwind CSS, SCSS, CSS Modules Responsive design, animations, optimization SSR, SPA, PWA Tools & Workflow: Git, GitHub, GitLab CI/ID Vercel, Netlify, Docker Figma-to-code workflows Agile / Startup environments Good fit if you need: - A frontend developer who can own features end-to-end - A reliable engineer for a long-term SaaS product - Someone who understands startup speed and priorities - A developer who can turn designs into polished production UI - Fast execution without sacrificing scalability - Clean frontend architecture for growing products If you need a fast, scalable SaaS frontend or MVP built properly from the start - send me a message.
- Next.js
- React
- Supabase
- Vue.js
- Nuxt.js
- SaaS Development
- SaaS
- JavaScript
- HTML
- CSS
- ExpressJS
- PostgreSQL
- Tailwind CSS
- Tailwind UI
- UI/UX Prototyping
- QA Testing
- Node.js
- Python
Lviv, Ukraine
Hi ๐ Iโm a UX/UI Designer with over 5 years of experience. I specialize in intuitive, engaging websites and digital products (mobile and desktop), with strong expertise in e-commerce, crypto, fintech, SaaS, and AI. I work with complex interfaces and turn them into clear, elegant solutions that improve user experience and drive business results. My design approach is focused on clarity, simplicity, and modern aesthetics. I combine user research with business goals to create interfaces that are not only visually strong but also practical and effective. I have a strong focus on conversion and performance. I work with analytics, user behavior, and data to make design decisions that actually improve results, not just visuals. I design and redesign e-commerce products, optimize key flows, and conduct UX audits with a clear CRO focus to increase conversions and usability. Key aspects of my process: โจ UX Research (surveys, interviews, personas, UX mapping) โจ Wireframing & prototyping for clear user flows โจ Design systems for consistency and scalability โจ Adaptive UI design across devices I collaborate closely with clients to deliver design solutions that are both visually refined and business-oriented. Services: โจ Product Design (Mobile & Desktop) โจ MVP Design for startups โจ UX/UI Design โจ Redesign of existing products and interfaces โจ UX Audits (CRO-focused) โจ Design Systems creation and support Letโs connect to create design that is both effective and visually strong. Last updated - 09/04/2026
- Prototyping
- Figma
- Web Design
- Adobe Photoshop
- Responsive Design
- User Interface Design
- UX & UI
- UX Research
- User Experience Design
- Wireframing
- Landing Page
- Material Design
- UIKit
- Shopify
Lutsk, Ukraine
๐8+ Years Experience | 50+ Projects | 20,000+ Hours | $800K+ Earned | Upwork Top Performer | Flutter Developer | Mobile App Developer Iโm a Flutter developer, mobile app developer, full stack developer, and web developer with 8+ years of experience building, fixing, and scaling mobile products for startups and growing companies. My work spans mobile app development, web development, and backend-connected product work, with a strong focus on clean architecture, smooth user experience, reliable delivery, and scalable app development. Iโve worked across Flutter, Flutter Dart, Flutter Firebase, React, React Native, Xamarin developer projects, Xamarin Forms, Xamarin.Forms, .NET MAUI developer builds, Swift developer work, SwiftUI, iOS, Android, iOS developer tasks, iOS Swift, Android developer tasks, Android Kotlin, Kotlin, native app developer projects, AI app development, MVP development, API integration, and cross platform mobile app architecture. I also support teams that need a practical full stack developer who can connect mobile apps with APIs, dashboards, cloud services, and web systems without slowing the project down. That mix of mobile app development and web development lets me work across the full product, not just one part of it. On Upwork, Iโve delivered 50+ projects, earned $800K+, and worked 20,000+ hours helping clients launch MVPs, modernize old apps, fix unstable codebases, and move products into production. That experience taught me how to balance speed with quality, especially when a project needs to ship quickly but still be stable enough for real users. It also taught me how to work with different teams, different product stages, and different technical constraints without losing momentum. For new products, I help with MVP development from concept to launch. For existing products, I step in to improve architecture, refactor weak areas, and make the app easier to maintain and scale. If youโre building a cross platform mobile app, I can help choose the right direction between Flutter, React Native, .NET MAUI, Xamarin migration, or native app development depending on the product goals, timeline, and long-term plan. I focus on making those choices practical, not trendy, so the app can grow without becoming harder to manage. Iโm also a strong fit for AI app development projects where the product needs more than a basic interface. That might mean smart workflows, automated actions, backend logic, or API integration that connects the app to real business systems. In those projects, I pay close attention to stability, data flow, security, and the user experience, because a useful feature only matters if it works reliably in production. ๐ก Areas I specialize in - SaaS and startup MVP development - from idea to production-ready MVP. - Cross platform mobile app architecture - Flutter, React Native, and .NET MAUI. - App modernization and legacy migration - Xamarin to .NET MAUI, Flutter, or React Native. - API integration and backend connectivity - for apps that need stable data flow and real-time features. - AI app development and product automation - for teams that want smarter app experiences. - Continuous delivery, refactoring, and codebase optimization - to keep existing products moving forward. - Mobile app development for iOS and Android - with a focus on stability, performance, and usability. - Full stack developer support - when mobile work needs web, API, or backend coordination. - Native app developer support - when the project needs platform-specific quality and performance. - React Native developer support - for teams already working in JavaScript-based mobile stacks. - Swift developer and iOS developer support - for polished Apple ecosystem apps. - Android developer support with Kotlin - for strong native Android performance. - Flutter developer support - for fast cross platform mobile app delivery. - Xamarin developer support - for legacy apps that need modernization or migration. - .NET MAUI developer support - for teams moving toward a modern Microsoft stack. - Cross platform mobile app delivery - when one codebase needs to support iOS and Android efficiently. Iโm a good fit when you need a mobile developer who can think beyond screens and help shape the full product. Whether the goal is a fresh MVP, a native app for iOS or Android, or a cross platform mobile app that can grow over time, I focus on code quality, maintainability, and practical results. I also make sure the work stays aligned with product goals, so the app is not just built well, but built in a way that supports growth and future updates. ๐ If you need a Flutter developer, React Native developer, Xamarin developer, .NET MAUI developer, Swift developer, iOS developer, Android developer, mobile app developer, web developer, AI app development partner, MVP development specialist, API integration expert, or full stack developer who can bring structure to a complex build and get it shipped, Iโm ready to help.
- Firebase
- Xamarin
- Flutter
- Mobile App Development
- Mobile App Improvement
- Push Notifications
- Location-Based Service
- Chat & Messaging Software
- Point of Sale & Payment Systems
- AR & VR
- Software Architecture
- AI Development
- GPS
- Supabase
- iOS
- Android
- C#
- Kotlin
- Swift
- Mobile Payment Functionality
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