Hello! I'm Alex, a full stack blockchain developer with expertise in smart contract development, bot creation, and front-end integration. Here are some of the skills I bring to the table: Bot Development I’ve built custom bots to monitor DeFi positions, track NFT ownership, and automate transactions across EVM-compatible chains. Smart Contract Development I’ve written, tested, and deployed smart contracts for DeFi protocols, NFT projects, and custom dApps. NFT Projects I've successfully launched multiple NFT projects, handling everything from metadata creation to deployment.​ Front-End Integration I am experienced with ethers/web3.js, and can seamlessly connect smart contracts with front-ends. Technical Consulting I’ve helped dev teams troubleshoot complex issues and keep projects moving efficiently. My goal is to understand your problem and work with you to deliver a clean, effective solution. Looking forward to working together, Alex

✨ UI/UX & PRODUCT DESIGNER 🏆 12+ YEARS OF INDUSTRY-LEADING EXPERTISE 🥇 UPWORK'S TOP-PERFORMING DESIGNER FOR 8 YEARS 👋 Hello! As an accomplished UX/UI and Product Designer, I have a stellar track record in delivering user-friendly and impactful digital experiences for clients such as Meshimer, Upserve Inc., SourceSeek Inc., EccoBike Inc., DiscoverYourEvents, GoodRadiance Inc., and more. Boasting 🌍 12+ years of international experience, my passion lies in crafting user-centric, engaging, and inclusive interfaces for web, mobile, and SaaS platforms across diverse industries. MY SKILLSET: ✅ Cutting-edge UI/UX & User Interface Design, User Experience Design ✅ Advanced and Interactive Prototyping, Sketching & Wireframing ✅ Streamlined Interface Design ✅ Adaptable & Responsive Design Mastery ✅ In-Depth User Flow & Research ✅ Strategic Competitive Analysis ✅ Comprehensive Customer Journey Mapping ✅ Data-Driven User Persona Development ✅ A/B Testing & Conversion Optimization 💡 My holistic project methodology encompasses research, planning, design, quality assurance, and product delivery, guaranteeing a frictionless journey from concept to fruition. With an expert grasp of design guidelines for Mac OS/Windows and iOS/Android, I am dedicated to shaping extraordinary digital experiences that resonate with users. 🔔 Feel free to reach out if you have any inquiries or are eager to collaborate on a groundbreaking project. Let's join forces and create a lasting impact in the digital world!

I fix and ship Solana wallet flows across web, mobile, desktop, and CLI. If your users cannot connect, sign transactions, approve wallet actions, or launch on Solana Mobile, I can diagnose the issue, patch the integration, and leave you with a working production-ready flow. I work with Solana Mobile Wallet Adapter, Wallet Standard, Seed Vault, TypeScript, React, React Native, Android, iOS, Node.js, CLIs, desktop apps, app-store deployment, and AI-agent/MCP wallet workflows. Good fits: - broken wallet connect or signing flows - Solana Mobile dApp launches - Phantom, Solflare, Backpack, or embedded wallet integrations - transaction approval and signing UX - React Native or Android wallet handoff bugs - wallet-enabled AI agents and MCP tools Built SolPulse and Agentic with real users, live store listings, and production release pipelines. My workflow is simple: reproduce the issue, isolate whether the failure is adapter setup, transaction construction, mobile handoff, RPC, permissions, or app state, then patch the flow and leave clear test notes.

I'm a developer & project manager, with experience working with small to medium sized businesses and startups, My expertise ranges from developing desktop, mobile or VR applications to setting up websites in either webflow or wordpress. I keep close track and provide progress updates on my work, and have managed groups of developers via leading daily calls, organising the workload, planning and assigning tasks etc.

I'm a web developer who writes clean, clear, modular, well-documented code that is easy to test, integrate, and maintain. I've worked with many libraries and frameworks, including Node.js, React, Three.js, Phaser.io, Sass, and have built vanilla JavaScript frameworks from scratch. I also have a little bit of experience in a lot of different programming languages, so I'm comfortable working with whatever tech stack you're using. My favourite jobs involve creating artful user-friendly websites/apps/games that are accessible, and work consistently across devices. To create or modify assets optimized for web, I use Inkscape for SVG, Blender for GLTF/MP3, and Gimp for PNG/JPG. I'm at my best when I'm solving problems and learning new things, and am open to many types of tasks including: - new development - feature addition - 2D/3D asset creation or integration - bug fixes - testing (Windows, MacOS, iOS, Android, Linux) - code reviews - technical documentation

Experienced web and mobile app designer / developer with Zaza.ventures. Successful projects across many industries – music, entertainment, proptech, agtech, HR tech, travel and more.

My first touch with FileMaker was back in the 2000s when I was a part of the team in one Finnish company, and we were creating a global tourist information database. But as a FileMaker developer, I started from version 9 (2009), and I developed for my own business: construction project management. It took me a couple of years until I made a solution that I wanted to use. Later I showed my solution to my customers and friends, and they liked it, and they said: "...you have to make software...". I didn't need to wait long, and in a few years, I transformed into a full-time application developer. I am constantly developing my solution, which I call "Benroy Business App" now. And recently, I presented it as an Unlocked FileMaker Template. Personally, I have strong troubleshooting and problem-solving skills. Detail-oriented, multi-tasked with strong organizational skills. Work effectively, independently, or as a part of a team.

I help startups and growing businesses build scalable mobile applications, AI-powered products, and backend systems that improve user engagement, automate workflows, streamline operations, and drive business growth. With +8 years of experience in software development, I specialize in building high-performance mobile applications using React Native, Flutter, Swift, and Java. I create intuitive user experiences, maintainable codebases, and scalable architectures that support long-term product growth across iOS and Android platforms. In addition to mobile development, I build AI-enabled applications and backend systems using OpenAI APIs, large language models (LLMs), and intelligent automation workflows. My experience includes integrating AI assistants, chatbot solutions, recommendation systems, document processing, AI-powered search, and intelligent automation features into mobile and web applications. I build robust backend systems using Spring Boot, Java, PostgreSQL, Supabase, and Firebase. My experience includes designing REST APIs, developing microservices, integrating third-party services, implementing secure authentication systems, and connecting AI services to production applications. Over the years, I’ve helped companies modernize legacy applications, improve performance, reduce crash rates by more than 40%, and introduce AI-driven features that improve user experiences and operational efficiency. I have delivered production-ready solutions in fintech, healthcare, SaaS, IoT, and enterprise domains, focusing on reliability, scalability, clean architecture, and intelligent automation. I value clear communication, transparency, and predictable delivery. Clients receive regular updates, practical technical recommendations, and clean, well-structured code that is easy to maintain, extend, and scale. Technology Stack Mobile Development : React Native (TypeScript, Expo), Flutter (Dart),iOS Development, Android Development (Java, Kotlin) AI Integration : OpenAI API, ChatGPT API Integration, LLMs , AI Agents Backend Development : Spring Boot, Java, REST APIs, Microservices, Supabase, Firebase, Node.js, Python API Integration Database : PostgreSQL, MySQL, SQLite, Room Database, Firebase Firestore Cloud & Backend Services : Firebase Authentication, Firestore, Cloud Functions, Push Notifications (FCM), AWS Services Architecture : MVVM, Clean Architecture, Modular Architecture, Scalable Mobile Architecture Testing : JUnit, Espresso, MockK, Unit Testing, DevOps & Tools : Git, GitHub, Gradle, Jenkins, Docker, CI/CD Pipelines I’m available for long-term contracts, dedicated team augmentation, and full product development. I focus on building strong partnerships by delivering high-quality mobile applications, AI solutions, and scalable software systems.

𝐁𝐮𝐢𝐥𝐝𝐢𝐧𝐠 𝐇𝐢𝐠𝐡-𝐏𝐞𝐫𝐟𝐨𝐫𝐦𝐚𝐧𝐜𝐞, 𝐂𝐫𝐨𝐬𝐬-𝐏𝐥𝐚𝐭𝐟𝐨𝐫𝐦 𝐀𝐩𝐩𝐥𝐢𝐜𝐚𝐭𝐢𝐨𝐧𝐬 𝐓𝐡𝐚𝐭 𝐒𝐜𝐚𝐥𝐞 Looking for a reliable, US-based expert to bring your app idea to life or rescue a struggling project? I am a Senior Flutter Developer based in New York with over 10 years of experience engineering mobile and web applications. I specialize in building robust, high-performance apps for iOS, Android, and the Web from a single codebase, saving you time and development costs without sacrificing quality. Having developed and successfully launched numerous applications for global companies, I understand what it takes to take a product from concept to a polished production rollout. I don't just write code; I build digital businesses. 𝐌𝐲 𝐂𝐨𝐫𝐞 𝐓𝐞𝐜𝐡𝐧𝐢𝐜𝐚𝐥 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞: 𝐅𝐫𝐚𝐦𝐞𝐰𝐨𝐫𝐤𝐬 & 𝐋𝐚𝐧𝐠𝐮𝐚𝐠𝐞𝐬: Expert in Flutter & Dart. 𝐂𝐫𝐨𝐬𝐬-𝐏𝐥𝐚𝐭𝐟𝐨𝐫𝐦 𝐃𝐞𝐩𝐥𝐨𝐲𝐦𝐞𝐧𝐭: Seamless execution across iOS, Android, and Web platforms. 𝐔𝐈/𝐔𝐗 & 𝐏𝐫𝐨𝐭𝐨𝐭𝐲𝐩𝐢𝐧𝐠: Transforming Figma designs into pixel-perfect, responsive interfaces. 𝐀𝐝𝐯𝐚𝐧𝐜𝐞𝐝 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧𝐬: Seamlessly embedding AI technologies and third-party APIs to make apps smarter and more competitive. 𝐌𝐨𝐧𝐞𝐭𝐢𝐳𝐚𝐭𝐢𝐨𝐧 & 𝐆𝐫𝐨𝐰𝐭𝐡: Implementing advanced monetization strategies (AdMob, custom subscription tiers, promo pricing) and App Store Optimization (ASO) for global markets. 𝐖𝐡𝐚𝐭 𝐘𝐨𝐮 𝐂𝐚𝐧 𝐄𝐱𝐩𝐞𝐜𝐭 𝐖𝐨𝐫𝐤𝐢𝐧𝐠 𝐖𝐢𝐭𝐡 𝐌𝐞: 𝐂𝐥𝐞𝐚𝐫 𝐂𝐨𝐦𝐦𝐮𝐧𝐢𝐜𝐚𝐭𝐢𝐨𝐧: As a NY-based developer, you get overlapping hours, crystal-clear updates, and rapid response times. 𝐒𝐭𝐫𝐚𝐭𝐞𝐠𝐢𝐜 𝐀𝐫𝐜𝐡𝐢𝐭𝐞𝐜𝐭𝐮𝐫𝐞: I build scalable, maintainable code structures designed for long-term growth and investor pitching. 𝐄𝐧𝐝-𝐭𝐨-𝐄𝐧𝐝 𝐃𝐞𝐥𝐢𝐯𝐞𝐫𝐲: From initial architecture and UI execution to App Store/Google Play console deployment and compliance. Let’s build something exceptional. Send me an invite, and let's discuss how we can accelerate your project.

I'm a senior software engineer at Booking, where I currently build our customer data platform. Before that I worked on infrastructure and security teams - so I'm comfortable owning a system end to end, from the data layer up to the parts that have to stay reliable and secure under real production load. What I do best: - Data platforms & backend systems - designing and building customer data infrastructure: pipelines, data modeling, and the services around them. - Infrastructure & security -production systems, deployment and reliability work, and building with security considered from the start rather than bolted on. - Mobile development - native Android applications, and iOS as well. From first prototype to a shipped app. - Algorithms & problem-solving - a strong mathematical background I lean on for anything performance-sensitive or algorithmically demanding. Math has been part of my work for a long time. I ranked in the top 3 at my national mathematics olympiad and was a member of my country's IMO team. I hold a BS in Computer Science and have taught Linear Algebra, Calculus, and Introduction to Algorithms at university level - which means I'm used to explaining technical decisions clearly, not just making them. I'm based in the Netherlands and work fluently in English, Kazakh, Russian, and Turkish (plus basic Dutch, A2). If you're building something in the data, backend, or mobile space and want a partner who'll think carefully about the design before writing the code - I'd be glad to hear about it.