Hire the Best Encryption Freelancers in Kyiv, UA

Dynamic WEB Development Expert with Over a Decade of Experience 🚀 Proficiency & Specializations: With 12+ years of industry experience, I specialize in delivering scalable, highly reliable web and mobile applications. For instance, I've delivered projects from a video streaming platform with auto-scaling capabilities to a restaurant ordering and check-out solution, which has grown from 0 to 5000 venues with more than 50000 unique users per day (over 2 million monthly). My expertise extends to web, PWA, and mobile app development within the FoodTech, HoReCa, Food & Beverage, and Retail industries. 📈Products I can help you build and succeed: - Custom Point of Sale development | POS terminals: I’ve built several feature-rich reliable, scalable, and successful POS systems for HoReCa and Retail industries: – Complex Workflows: Streamlined HORECA operations like table reservations and kitchen coordination for faster service and fewer errors. – Inventory Management: Built real-time stock tracking with automated alerts to minimize overstocking and stockouts. – Scalability: Designed cloud-based systems for multi-location businesses, ensuring centralized control and consistency. – Third-Party Integrations: Integrated payment gateways, accounting tools, and loyalty programs for seamless operations. – User Adoption: Created intuitive interfaces and provided training for smooth transitions. - Сustom-made KDS with support of various POS systems, with main functionality: – Large-Screen Compatibility: Optimized for visibility on large monitors. – POS Integration: Full integration with the client’s existing pos system, ensuring real-time data flow. – Remote Order Management: Order processing through a keyboard interface. – Expo Mode: For waitstaff to track order readiness. – Android Compatibility: Built exclusively for cost-effective android devices. – Unique Access Control: A back-office licensing system ensures exclusive, secure access for authorized users. - Self-service Kiosk systems for quick-service restaurants: – Order Customization: Designed intuitive interfaces to handle complex order modifications (e.g., toppings, modifiers, dietary preferences) while keeping the process simple for customers. – Integration with Kitchen Systems: Connected kiosks to Kitchen Display Systems (KDS) and POS systems, ensuring accurate and real-time order flow to the kitchen. – Accessibility and Usability: Built kiosks with multi-language support to cater to diverse customer needs. – Maintenance and Reliability: Developed robust systems with remote monitoring and troubleshooting capabilities to minimize downtime and ensure smooth operations. - Custom online ordering systems for restaurants and food businesses: – Complex Menu Management: Designed systems to handle intricate menus with customizable options (e.g., toppings, sizes, dietary preferences, product modifiers, allergens, etc) while ensuring a smooth ordering process. – Integration with POS and Kitchen Systems: Connected online orders to POS and Kitchen Display Systems (KDS) for real-time order processing and accuracy. – High Traffic Handling: Built scalable platforms capable of managing peak order volumes during busy hours without performance issues: from 0 to 2 million unique users monthly. – Payment and Security: Integrated secure payment gateways and implemented robust data encryption to protect customer information and build trust. – Delivery and Pickup Coordination: Added features for real-time order tracking, delivery scheduling, and pickup notifications to improve customer satisfaction. – Promotions and Loyalty Programs: Incorporated features for dynamic discounts, upselling, and loyalty rewards to boost customer engagement and repeat orders. 💡 Technical Toolbox: - Web & Software Architecture: Expert in crafting robust SaaS Applications. - Python Mastery: Proficient with Fast API | FastAPI | Flask | Django | Django REST Framework | Celery and Django Tenants - Cloud Solutions: Skilled in AWS ( EC2 | RDS | S3 | CloudFront | Lambda ), DigitalOcean and Ubuntu Server / VPS setup. - Database & Server Management: Competent in Nginx | MySQL | PostgreSQL | MongoDB - Automation & CI/CD: Experienced in Bitbucket pipelines and GitHub actions - Modern Tools: Proficient in Git, Docker, Docker-compose - Payment Integration: Skilled in integrating systems like Stripe | Checkout.com | Moyasar | Apple Pay 🌐 Front-end: - Javascript & Frameworks: Adept in JS , Vue.js , Vuex , React , React Toolkit (RTK) Redux. - Web Design: Proficient in HTML, CSS ( SASS | SCSS ), templating, Bootstrap , Bootstrap5 🌟 Personal Traits: - Innovative Thinker: Always eager to explore new ideas and concepts. - Continuous Learner: Committed to staying updated with the latest technologies. - Independent & Team Player: Capable of thriving both as a self-starter and in collaborative environments.

My name is Vitaliy and I have 6 years of experience managing IT projects and have more than 100 satisfied clients from such industries as eCommerce, SaaS, FinTech, NFT, Crypto, Media, Retail, Real Estate, Banking, and more. I have extensive experience with Agile, Kanban, and Waterfall project management as well as I've worked with different flavors of PM software such as MS Project, Jira, Confluence, Trello, Smartsheet, Zoho, and a few others. Currently, I work as a freelancer and have a team of specialists who are proficient with the following: Services that we provide: ✅ Business strategy and consulting; ✅ UX/UI design; ✅ Full cycle web and mobile development; ✅ Custom product development; ✅ Cloud-based solutions; ✅ Testing and Advanced Quality Assurance; ✅ DevOps; 💻 Technologies: - JavaScript Frameworks: AngularJS, Angular, Next.js, React, Vue.js, D3.js, Three.js, Nest.js, Node.js, Express.js, REST API, GraphQL; - C# frameworks: ASP.NET, .NET; - PHP frameworks: Laravel, Symfony; - Databases: MySQL, PostgreSQL, MongoDB, NoSQL, SQL; - Hybrid mobile apps: ReactNative, Flutter; - Native iOS & Android apps: Kotlin, Swift; - Cloud solutions: AWS, Microsoft Azure, Google Cloud Platform, Oracle; Industries we work with (also, we are ready to learn new ones) ⭐️ Sales & Marketing ⭐️ FinTech | NFT | Crypto projects ⭐️ Enterprise software (ERP & CRM) ⭐️ Healthcare ⭐️ Real Estate ⭐️ Education & Human Resources ⭐️ eCommerce Rest assured, our team stands prepared to deliver an excellent experience marked by transparency and high-quality outcomes. We are aimed to build long-term business relationships with you. ✉️ Contact us here with your project requirements to get a professional analysis and estimate. ✉️

💎  Top Rated Wordpress, Webflow, Shopify Developer and UI/UX Design Expert 🟢 Available Now 👨🏻‍💻 8 years in Web design and Web Development 📊 130+ completed projects 🖥 Website and E-commerce Development: Creating visually stunning and user-friendly websites, landing pages and online stores. 📱 User Interface Development (Web Application, Mobile App): Designing intuitive and engaging interfaces for apps, web platforms, and human-machine interfaces. 💻 Interface Prototyping: Interactive prototypes that provide a clear vision of your user interface before development. 🕐 On-time Delivery 🏁 Available to start the same day you text me! SERVICES INCLUDE: 🎯 CMS Development 🎯 Front-End Development 🎯 Website Design 🎯 Web App Design 🎯 Mobile App Design WORK TOOLS: 🛠 Webflow 🛠 WordPress 🛠 Elementor Pro 🛠 WooCommerce 🛠 Shopify 🛠 HTML, CSS, JavaScript, React 🛠 Figma — Webflow, Wordpress, Figma to Wordpress, Figma to Webflow, SEO optomization, Figma designs, Wireframes, Adobe Illustrator, Wordpress bugfixing, Webflow bugfixing, Elementor, WP Bakery, Wordpress Themes, Shopify, Figma to Shopify, E-commerce website, landing page, multipage website, Woocommerce, Wordpress adjustments, Webflow adjustments, HTML, Java Script, React, Node js, Wordpress development, Webflow development, Mobile responsive design, Web design, Figma design, Adobe design, Graphic design, Webflow template, Wordpress to Webflow, Webflow to Wordpress, Website platform, CMS, CMS development, CMS adjustments, Mobile design, Real Estate development, B2B website, Marketing Agency website, Shops, Medical websites, Booking functionality, Wordpress plugins, Back-end, Front-end, CMS platforms, Coding, Bots creation, Shopify template, Website Figma, Website Adobe XD, Website Sketch, Website Data Visualization, Website User Research, Website Persona Creation, Website Color Palettes, Website Storyboarding, Website UI Kits, Website Mood Boards, Website Information Hierarchy, Website User-Centric Navigation, Website User Flows, Website Visual Hierarchy, Website Rapid Prototyping, Website Microinteractions, Website Web Design Psychology, Website User Testing, Website Gradient Design, Website Loading Animations, Website Mobile Optimization, Website Video Integration, Website Custom Icons, Website Performance Optimization, Website CMS Integration, Website User Engagement, Website Design Thinking, Website developer, Front end developer, HTML CSS, JavaScript, responsive design, UI/UX design, web development, Bootstrap, Tailwind CSS, Angular, Vue.js, PHP, MySQL, Git, version control, API integration, RESTful APIs, JSON, AJAX, DOM manipulation, cross-browser compatibility, accessibility, mobile-first design, web hosting, domain management, SSL certificates, DNS configuration, Sass, LESS, Webpack, npm, Yarn, browser developer tools, Chrome DevTools, website performance optimization, caching, e-commerce development, website security, debugging, Front-end development, web design frameworks, web performance optimization, user interface, user experience, front-end tools, CSS Grid, Flexbox, media queries, front-end libraries, TypeScript, ES6, animations, CSS transitions, SVG, Canvas, web typography, web fonts, Lighthouse, Web Development, Frontend Development, Backend Development, Full-Stack Development, React.js, Vue.js, Angular, Express.js, Django, Ruby on Rails, Laravel, SQL, PostgreSQL, MongoDB, GraphQL, jQuery, Babel, GitHub, GitLab, Progressive Web Apps, Single Page Applications (SPA), Web Accessibility, WCAG, Web Vitals, Joomla, Drupal, Magento, API Development, Microservices Architecture, Serverless Architecture, Authentication, OAuth, JWT, Web Security, SSL/TLS, HTTPS, Encryption, Penetration Testing, Data Validation, Performance Optimization, Lazy Loading, CDN, UX/UI Collaboration, Prototype to Code, Figma to HTML, Web Animation, Material UI, Chakra UI, WebSockets, WebRTC, Graphical Interfaces, User Dashboards, Admin Panels, CRUD Operations, Asynchronous Programming, Promises, Async/Await, MVC Architecture, API Documentation, Technical Writing, Software Documentation, Prototyping, Design Systems, RESTful Services, Headless CMS, Headless Commerce, Localization, Internationalization, Performance Metrics, Google Analytics, Web Dev Tools, Console, Debugging, Error Handling, Web API, Event Handling, OAuth Integration, Payment Gateways, Stripe, PayPal Integration, Email Handling, SMTP, Web Push Notifications, Real-Time Applications, Firebase, Web 3.0, Blockchain, dApps Development, Solidity, Smart Contracts, Ethereum, NFT Marketplace Development, FinTech Solutions, SaaS Platforms, IoT Development, Micro Frontends, Code Review, Code Optimization, Technical SEO, Server Management, Linux, Apache, Nginx, Content Delivery Networks, Web Performance Testing, Conversion Rate Optimization, UI Components, GSAP

As a product UX/UI designer, I help SaaS, B2B, and AI-driven companies turn complex workflows into intuitive, conversion-focused solutions. With over 15 years of experience in end-to-end user experience and UI design, I specialize in creating scalable product interfaces, data-driven dashboards, and AI-enhanced design systems that balance usability with business impact. From MVP design, analytics dashboards to operational SaaS tools, I build design systems that reduce friction, improve adoption, and align user experience with business goals. 🎯 Why my partners work with me: ✔️ 17 years of experience designing data-driven products for SaaS and tech startups ✔️ Trusted by global brands and startups: Bayer, Big4 Audit Firm, Digital Leadership, Sortly, WearLinq Labs, Reliant AI, Ceratizit, Linetweet, and 20+ other B2B and SaaS innovators. ✔️ Cool portfolio: awarded team and 1200 followers on Behance and 720 followers on Dribbble ✔️ Global-ready - fluent English, CET timezone (Germany), easy communication for international teams. ✔️ Iterative design process & daily updates - stay in the loop with ongoing progress, feedback checkpoints, and real-time flexibility ✔️ Start with a pilot: get your first concept in 24 hours and review together, including a clear breakdown of scope, timeline, and realistic budget expectations ✔️ Adaptive & responsive designs. Cross-platform consistency: seamless UX across web, mobile, and complex systems. ✔️ Agile collaboration - let’s begin with a single feature. If it doesn’t hit your goals, I’ll redesign it at no cost. Most clients move into full product design after this test ✔️ Scalable handoff - from research and UX flows to UI delivery and developer-ready handoff 🔍 What I do best: • SaaS & B2B dashboard design (web & mobile) • AI-integrated platform UX & data visualization • Complex dashboard & workflow system design • UX optimization for conversion and retention • MVP validation & scalable design systems for growing products 💡 You’ll get • A structured, research-based approach to UX • Collaborative design process aligned with your GTM and product roadmap • Figma-based design systems ready for development • Business-oriented UX that supports growth, not just aesthetics 🔄 My Design Process When you hire me, you’re not just getting a designer - you’re getting a strategic design partner who works side-by-side with you from idea to implementation. Here’s how we’ll work together: → Discovery & Alignment: a quick call to define goals, users, and success metrics - ensuring clarity from day one. → Direction & UX: building moodboards, flows, and wireframes to align visuals and structure with your business goals. → UI & Prototyping: you’ll get polished, interactive Figma prototypes that make your product feel real. → Handoff & Support: a dev-ready file preparation, and I'll stay involved to ensure smooth implementation and pixel-perfect results. 🛠️ Tools I Work With I use Figma, FigJam, and Miro to create collaborative prototypes, and Notion, Jira, and Slack for transparent, agile communication with dev teams. Tools like Hotjar, GA4, and UsabilityHub help me validate real user behavior before handoff. Let’s transform your complex SaaS idea into a seamless, user-friendly product that drives engagement, retention, and real business outcomes.

I help fintech, crypto, and SaaS companies design, scale, and optimize distributed backend systems and payment infrastructure. With 25+ years of software engineering experience, I have worked across the entire stack—from low-level systems programming and hardware integration to modern cloud-native architectures built with Node.js and TypeScript. My background combines software architecture, cryptography, and financial operations, allowing me to bridge the gap between engineering decisions and business outcomes. Selected Results: ✔ Architected a global proxy infrastructure managing thousands of distributed IoT devices across multiple regions under sustained high load. ✔ Reduced blockchain transaction costs by approximately 90% through optimization of TRON energy management, generating six-figure annual savings for the client. ✔ Designed custom encryption and security mechanisms that prevented a five-figure financial loss when standard protections proved insufficient. Core Expertise: • System Architecture & Technical Leadership * Microservices (NestJS) * Event-Driven Architecture * Domain-Driven Design (DDD) * Distributed Systems * Performance Optimization • Fintech & Crypto Infrastructure * Payment Gateways (Crypto, Stripe, Custom Integrations) * Wallet and Ledger Systems * Double-Entry Accounting Logic * Blockchain Integrations (TRON, BTC, USDT) * Trading and Automation Systems • Infrastructure & Hardware Integration * IoT Platforms * Cisco and MikroTik Networks * VoIP Systems (Asterisk) * Custom Device Management Platforms Technology Stack: TypeScript, Node.js, NestJS, PostgreSQL, MongoDB, Redis, RabbitMQ, Docker, Linux I work best with companies that need more than implementation alone—whether that's designing a new platform, scaling an existing system, auditing architecture, or solving performance and reliability issues in production environments. I can help with: • Architecture Reviews & Technical Due Diligence • System Design & Scalability Planning • Performance Bottleneck Analysis • Fintech & Payment Infrastructure • Legacy System Modernization • Technical Leadership & Architecture Consulting

💼 100% Job Success Score ✅ Front end Developer ai ✅ Front end Developer React ✅ React Full Stack Developer ✅ React Developer ✅ Full Stack Developer React 🚀 Looking for full-time projects only — please don’t invite for small fixes. I work as a Front end Developer focused on scalable products, dashboards and modern applications. My experience as a React Full Stack Developer allows me to manage projects from frontend architecture to backend integration while maintaining scalability. As a Front end Developer React specialist, I create responsive interfaces and business applications using Python, Next.js, React Node.js, React.js, TypeScript and JavaScript. My background as a React Full Stack Developer and Full Stack Developer React helps me combine frontend performance with backend reliability to support growth. I work as a Full Stack Developer React building SaaS platforms, AI tools, booking platforms, and dashboards. My experience as a Full Stack Developer React Node allows me to develop backend systems, API integrations and workflows powered by React Node.js technologies. As a Front end Developer, I focus on clean user experiences and scalable frontend systems. I work as a Front end Developer React building optimized interfaces for AI-powered applications and customer platforms. My work as a React Full Stack Developer and Full Stack Developer supabase react includes frontend and backend integrations, API architecture and scalable infrastructure. As a Full Stack Developer React, I help businesses launch reliable applications with flexible system design as a Front end Developer React. I build products as a Full Stack Developer React firebase using frontend frameworks and scalable backend technologies. My experience as a Full Stack Developer React Node allows me to deliver complete applications with business logic and React Node.js architecture. 💡 What I Do ✨ Frontend applications As a Front end designer and React Full Stack Developer, I create responsive dashboards, management tools and SaaS platforms. I work as a Front end Developer React specialist focused on performance. ✨ Full stack product development, Software Development As a Full Stack Developer node and React Full Stack Developer, I build products from planning to deployment while supporting business growth. ✨ Backend systems and integrations My work as an App Front end Developer, Front end Full Stack Web Developer, Front end Developer React, Full Stack Developer laravel, Full Stack Developer React, full stack node.js react and Full Stack Developer React Node includes API integrations, automation systems and backend services using React Node.js technologies. ✨ Business platforms I help companies build internal tools, customer platforms, AI systems, and analytics products as a Shopify Front end Developer, Angular Front end Developer and Full Stack Developer. ✨ Modern SaaS architecture I optimize business systems and internal platforms powered by React Node.js with focus on maintainability. ✨ AI-powered products I develop AI tools, customer portals and analytics systems using modern React Node.js architecture for scalable applications. ✨ Complex development As a React Full Stack Developer native and Full Stack Developer React Node specialist, I build SaaS platforms, AI-powered applications, and business systems with reliable frontend and backend architecture. ✨ API-driven systems My experience as a Full Stack Developer and Full Stack Developer React Node includes integrations, automation workflows, dashboards, and scalable API services. ✨ Long-term architecture I work as a Full Stack Developer React Node creating maintainable systems designed for performance and flexibility. ✨ SaaS and dashboard development As a Full Stack Developer and Full Stack Developer React, I create dashboards, internal tools, and business platforms optimized for scalability. ✨ Modern frontend architecture My experience as a Full Stack Developer React includes responsive interfaces, reusable UI systems application structures. ✨ Product scalability and integrations I work as a Full Stack Developer and Full Stack Developer React developing business applications with integrations systems. ⚙️ Technologies & Tools Next.js, TypeScript, React Node.js, JavaScript, React Node.js, Node.js, REST API, GraphQL, AI integrations, chatbot systems, dashboards, SaaS platforms. As a Front-End Development specialist, I create high-quality web applications using HTML5, CSS 3, Bootstrap, jQuery, Angular, and Vue.js. With expertise in Responsive Design, Web Design, PSD to HTML, Git, Front-End Development Frameworks and Web Development, I deliver clean, maintainable and scalable solutions focused on user experience. My experience as a Front end Developer figma, a Wordpress Front end Developer, Front end Developer React, Front end Developer Tailwind, Full Stack Developer React, Front end Developer next.js and Full Stack Developer React Node allows me to build modern application