I have 15+ years of software development experience, and I am specialised in full stack Drupal development. This means I am very good with databases (mysql), backend development (PHP), and front end development (HTML, JavaScript).

Hey! My name is Alexander Zayek, and I'm a seasoned voice over artist that's recently brought my talents over to Upwork! I've worked with the likes of Pizza Hut, Ortovox, and more and would love to lend my voice to your project. Send me a message and we can work out the details so we can bring your project to life!

AI-Assisted Flutter Developer | Operating System Architect | Cross-Platform App Specialist I'm Christian Cassarly, an AI-assisted Flutter developer focused on building high-quality mobile applications, systems, and cross-platform software. I specialize in creating polished Flutter applications that are fast, intuitive, scalable, and designed for long-term growth. My largest project has been the design and development of a complete operating system experience built with Flutter. This project has strengthened my skills in UI/UX design, application architecture, AI integration, cloud services, custom interfaces, animations, and large-scale software organization. Beyond software development, my background includes writing books, financial education, healthcare experience, culinary arts, and a wide range of interdisciplinary interests. Bringing ideas together from different fields helps me approach software from multiple perspectives and design applications that are practical, innovative, and user-focused. What I can build Flutter mobile applications Cross-platform apps (Android, iOS, Desktop) AI-assisted applications Firebase integration Custom user interfaces Productivity systems Business applications Educational software Custom operating system interfaces Interactive experiences If you'd like to explore my design philosophy and the quality of my work, you're welcome to test the Jesus New OS Beta using the link below. It demonstrates the level of craftsmanship and creativity I bring to my client projects and serves as a preview of my long-term hardware vision, the PineCone phone. I value clear communication, professionalism, and respect for everyone's time. If you're serious about building an application or bringing an idea to life, I'd be glad to discuss your project. My goal is to provide exceptional value by delivering high-quality software at competitive pricing while maintaining strong attention to detail throughout development. If you're looking for someone who combines creativity, technical skill, AI-assisted development, and systems thinking to help bring your vision to life, I'd be happy to work with you.

Social Media Management Bio I can get content for your Social Media Pages and post anywhere from 1 to 5 posts per day. In the past I have noticed posting content on pages will engage customers or potential customers. I can work on a month to month basis or less. Web/Mobile Editor Bio Throughout my years in College going for Software Development, I picked up so skills. I've worked on my own website as well as other companies who needed to hire a new web developer. I've turned websites into a more responsive or mobile friendly pages. I can work on mostly any websites including Joomla, Wordpress, and more. Please keep in mind I can only edit the cosmetics of the websites. This is wording, the page design such as background colors, adding social media links, and more. Music Bio I have over 15 years of producing beats, rapping, and singing. The genre's I can work with is Hip Hop, Pop, and R&B. I've done countless music such as short films, a web series, a mobile app advertisement campaign and more. I've caught the attention of MTV supervisor Jen Schwartz out of New York back in 2009. Missy Elliot follows me on twitter @kayskeem after hearing one of my beats and I've done a song with the rapper Mims we're fb friends. Although I sing and rap I do not write anything but it will seem as if I wrote it. I've designed music websites (Beat Website) just to show my talent in beat making and helped design a music streaming website & app on android (ios is under maintenance) just to show my work as an artist. I've also produced music for my small business commercials. I can send links of all my work upon hire.

I help startups and product teams build or modernize SaaS and mobile products and add AI features to existing software. With 12+ years of experience, I work with React, Node.js, TypeScript, and React Native from architecture through production. Typical engagements: • Full-stack SaaS development and modernization • React Native mobile development, performance, and production debugging • AI feature integration using local or hosted models, with structured outputs, evaluation, error handling, and streaming UX • APIs, authentication, payments, accounting, search, and other third-party integrations • Architecture reviews and difficult cross-layer production issues Relevant experience: • First technical hire for a B2B fintech platform, where I helped take customer-facing and admin apps from zero to production, then expanded into Node.js and GCP backend systems, CI/CD, financial workflows, search, and accounting integrations. • Lead engineer for a React Native language-learning product that raised $1.2M on Kickstarter and launched publicly on iOS and Android. I owned its initial mobile, backend, data, authentication, and mobile 3D architecture and later led a four-developer team. • Primary engineer for a centralized OIDC/BFF identity service used by multiple products, with PKCE, Redis-backed token vaults, session security, and staged rollout. • Founder and lead engineer for an internal alpha of a local-first AI-powered application spanning Rust, Tauri, React, local and hosted models, streaming speech, memory, and evaluation. I stay hands-on while contributing to architecture, implementation, code review, testing, deployment, and clear client communication. I can join a greenfield build, modernize an existing system, or investigate a difficult production problem. If you need a senior engineer who can take ownership across product and technical boundaries, send me the product context, current stack, and the outcome you need.

I am a professional software architector with over 20 years of experience in the field. As the director of a software development company, I have successfully completed hundreds of projects, ranging from simple landing pages to complex multi-server solutions. My team and I specialize in building reliable and scalable business solutions that help clients achieve their goals. We offer a full range of services, including web development, high-load server systems, and architectural solutions. If you’re looking for a trusted partner with extensive experience and a proven track record of delivering successful projects, I’m here to help you reach your goals

17,500+ hours, $700K+ earned — building React and Next.js applications since 2014. I also design, ship, and operate my own products, including a property marketplace with 30,000+ monthly active users. That means I'm not only implementing tickets. I've owned architecture, performance, releases, and support on products real users depend on daily, and I bring that judgment to client work. SELECTED WORK • Property Marketplace — Next.js + React Native/Expo in a Turborepo monorepo across web, mobile, and landing. Interactive district maps, price analytics, AI-powered search, three locales. • Crypto Portfolio Tracker — Next.js + React Native + Convex real-time backend, TypeScript throughout. Read-only Binance sync, non-custodial, OpenAI assistant. Published on the App Store. • Virtual Events Platform — Dolby io conferencing, Mux live streaming, PubNub chat, fan queue management. Built from scratch. • Legal Tech SaaS — enterprise matter management: budget tracking, D3/Recharts dashboards, GraphQL subscriptions, role-based permissions, document management. • Enterprise Asset Management — Scandit barcode scanning, virtualized lists over large datasets, drag-and-drop interfaces, calendar views, PDF generation, React Native app. MY OPEN SOURCE PROJECTS • lpm — runs Claude Code, Codex, and other AI coding agents in parallel on one codebase without branch conflicts. • voice-to-text — fully on-device dictation on the Apple Neural Engine. STACK React · Next.js · TypeScript · Node.js · React Native + Expo · Redux · GraphQL/Apollo · React Query · Convex · Firebase · Tailwind CSS · Material UI · shadcn/ui · D3 · Recharts · WebRTC · Socket IO · Playwright · Jest · Storybook · Turborepo · Vite Master's degree in Computer Science. Available 30+ hrs/week, response within four hours.

### Senior Software Developer | Java, Spring Boot, Angular, React & Microservices I’m a Senior Software Developer specializing in **Java, Spring Boot, Angular, React, and microservices**, with strong experience building secure, scalable, and maintainable enterprise applications. I can help you with: * **Backend:** Java, Spring Boot, REST APIs, Microservices, JPA/Hibernate * **Frontend:** Angular, React, TypeScript, JavaScript * **Architecture:** Microservices, RabbitMQ, event-driven systems, API integration * **Databases:** PostgreSQL, Oracle, SQL Server * **Security:** Spring Security, OAuth2, JWT * **DevOps:** Jenkins, CI/CD, Docker, Kubernetes, Ansible * **Testing:** JUnit, Mockito, integration testing * **XML:** XML processing, validation, transformation, and document-based workflows I’m experienced in integrating legacy and third-party systems, developing internal business processes, automating deployments, and delivering reliable solutions for complex enterprise environments. I focus on **clean code, solid architecture, performance, security, and long-term maintainability**. Whether you need a complete application, a new microservice, an API, frontend development, or help improving an existing system, I can take ownership from design through implementation and deployment.

Tired of generic, template-based products that not convert? I’m a Product Designer specializing in custom UX/UI for web and mobile apps. I design data-driven digital products built from scratch, not templates, using user research, analytics, and experimentation. I work in Figma, creating high-fidelity prototypes ready for testing and developer handoff. I’m a Product Designer with 7+ years of experience, focused on data-driven UX and UI. I’ve designed close to 100 digital products across web platforms, SaaS products, and mobile apps, working from early discovery to high-fidelity Figma prototyping and launch. 💡 How I Can Help You End-to-End Product & UX Design From research and strategy to design, testing, and iteration. Custom UX/UI Design, No Templates Every interface is designed from scratch for web and mobile apps to ensure a premium, differentiated product. Data-Driven Design Decisions UX and UI informed by user research, usability testing, analytics, and experimentation. Figma Prototyping & Interaction Design High-fidelity prototypes in Figma for web and mobile apps, ready for validation and developer handoff. Web Product & Platform Design Strong experience designing scalable web platforms, responsive systems, and complex information architecture. Mobile App UX/UI Design User-centered design for iOS and Android apps, optimized for usability and growth. CRO & UX Writing Design and messaging optimized to improve conversion, engagement, and retention. Scalable Design Systems Accessible, consistent UI systems designed to grow with your product. ⭐ Client Review “Where do I start, Andrea is a true diamond in the rough. My biggest thing when looking for a designer was getting away from designs that felt templated and outdated. There are so many things that can go wrong when it comes to design and she makes sure it all goes right, by applying her expertise while also taking feedback and considering your vision. I’m operating multiple growth partnerships for 7–8 figure brands and found Andrea in the thick of building my team of A players. If you’re not collaborating with her yet, have a call with her, do a test project and you’ll see what I mean. Thank you for everything Andrea!!!” 🎯 Core Skills Product Design | UX/UI Design | Web & Mobile App Design | Figma Prototyping | User Research | Wireframing | Information Architecture | Usability Testing | CRO | Data-Informed Design | UX Writing | Accessibility | SEO for Web & App Products ⚙️ Tools Figma | Webflow | WordPress | Shopify | Design Systems | Prototyping | Analytics Tools | Photoshop | Illustrator If you’re looking for a Product Designer who builds custom UX/UI from scratch, values data over assumptions, and designs products that scale, let’s talk. Happy to start with a test project or a discovery call.

Passionate and creative App Developer with experience in building modern mobile and web applications. Skilled in Android, iOS, UI/UX design, and scalable software solutions. Dedicated to delivering innovative, user-friendly, and high-performance digital products that help businesses grow and succeed in the digital world.