I work on new Drupal 10/11 builds as much as legacy Drupal 7, whether that’s supporting and securing an old site after end of life or migrating it onto something modern. A growing part of my work is decoupled and headless: a Drupal or other CMS back end with a React or Next.js front end. The migration itself is the part I actually enjoy. Taking a site off an old version and rebuilding it fresh with the Migrate API, that’s the good part. I like complex logic, integrations with external services, and the fiddly Twig theming most people would rather avoid. I can’t stand digging through someone’s pile of workarounds to work out why a thing half-works. When I open an old site, that’s usually what’s waiting. Most of the time I’d rather rebuild the logic properly than keep patching around it, and I’ll tell you upfront when that’s the better call. Some of what I’ve built: a Drupal 7 to 9 migration of 1.5M+ entities for a news site, with no data lost. I handled the Microsoft Dynamics 365 integration on Walnut Creek Foods’ commerce site, and built the custom API and event calendar behind the March of Dimes platform. I also do long-term Drupal support and maintenance: module and security updates, payment and CRM integrations, performance work, and keeping legacy Drupal 7 sites patched and secure after end of life. I tend to stick around, too. Some clients have kept me on for years. Stack: PHP, Drupal 7 to 11, Symfony, React, Next.js, TypeScript, GraphQL, JSON:API, MySQL, Apache Solr. If you’ve got a Drupal project, new or legacy, message me with what’s going on and I’ll tell you whether I can help.

I am experienced Senior Full Stack Developer proficient in PHP/Laravel and JavaScript/Vue.js. I have over 11 years of experience in projects of varying complexities: social networks, CRMs, High-loaded e-commerce, educational platforms. I am passionate about learning new technologies and implementing innovative projects to life.

⭐⭐⭐⭐⭐"Angle2 and its team have been invaluable in completing this critical feature. Their recommendations and guidance resulted in tremendous value for our end users." — 𝑀𝑎𝑡𝑡 𝐽𝑒𝑛𝑠𝑒𝑛, 𝐹𝑜𝑢𝑛𝑑𝑒𝑟, 𝐺𝑟𝑎𝑝ℎ𝑖𝑡𝑢𝑝 ⭐⭐⭐⭐⭐ "Communication was top-notch, he met all deadlines, and his skills were reasonably strong. I will likely have additional jobs for him in the future." — 𝐴𝑛𝑛𝑐𝑎𝑟𝑒𝑙 𝑆𝑎𝑛𝑐ℎ𝑖𝑎𝑏𝑎𝑟𝑐𝑎, 𝐶𝑜-𝐹𝑜𝑢𝑛𝑑𝑒𝑟, 𝐾-𝐿𝑎𝑏𝑠 I help product teams ship frontend that works - SaaS dashboards, eCommerce storefronts, startup MVPs, and component systems built to last beyond the first release. Clean, maintainable React and Next.js code that the next developer on your team can actually work With. 𝐖𝐡𝐲 𝐜𝐥𝐢𝐞𝐧𝐭𝐬 𝐜𝐡𝐨𝐨𝐬𝐞 𝐭𝐨 𝐰𝐨𝐫𝐤 𝐰𝐢𝐭𝐡 𝐦𝐞 • Scope defined upfront - milestones, deliverables, and timeline agreed before a line of code is written • No black-box development - regular demos and updates at every stage • I step into existing codebases without breaking what works • Communication that doesn't require chasing - you always know where things stand • 30+ projects delivered across SaaS, eCommerce, and startup products Over 8 years I have shipped SaaS platforms, eCommerce frontends, admin dashboards, MVP products, and component libraries across fintech, retail, edtech, and enterprise software - on time, within scope, with clean documented code handed over at the end. 𝐖𝐡𝐚𝐭 𝐈 𝐛𝐮𝐢𝐥𝐝 ⚙️𝙎𝙖𝙖𝙎 & 𝘽2𝘽 𝙛𝙧𝙤𝙣𝙩𝙚𝙣𝙙𝙨 • Dashboards with real-time data, role-based views, and complex state management • Multi-step workflows, data tables, editors, and admin panels • Component libraries and design systems built with Storybook, shadcn/ui, Tailwind CSS • Production-grade refactoring of AI-prototyped or iteratively built codebases eCommerce & marketplace frontends • Storefront interfaces with performance-first architecture • Product pages, checkout flows, cart and inventory UI • Integration with Stripe, HubSpot, ActiveCampaign, and third-party APIs ⚙️𝙈𝙑𝙋 & 𝙨𝙩𝙖𝙧𝙩𝙪𝙥 𝙥𝙧𝙤𝙙𝙪𝙘𝙩𝙨 • React and Next.js applications from design to deployed • Figma to pixel-perfect implementation • Fast iteration without sacrificing code quality ⚙️𝙈𝙤𝙗𝙞𝙡𝙚 • React Native and Expo for cross-platform mobile applications 𝗦𝘁𝗮𝗰𝗸 • Frontend: React, Next.js, TypeScript, Vue, Nuxt.js, Tailwind CSS, shadcn/ui, Redux, Zustand • Backend integration: Supabase, PostgreSQL, REST APIs, GraphQL, Node.js • Auth & payments: Supabase Auth, Google OAuth, Stripe, JWT • Testing: Jest, React Testing Library, Vitest, Cypress • Deployment: Vercel, Netlify, AWS, GitHub Actions CI/CD • Mobile: React Native, Expo 𝗦𝗲𝗿𝘃𝗶𝗰𝗲𝘀 • SaaS frontend development - dashboards, workflows, admin tools • eCommerce frontend - storefronts, checkout, product UIs • MVP development - design to production in structured milestones • Codebase audit and refactor - production-grade hardening of existing frontends • Component library and design system setup • Figma to React / Next.js implementation • React Native mobile development • Third-party API and CMS integration My background is senior frontend development - 8 years building SaaS platforms, eCommerce frontends, and startup MVPs with React, Next.js, and TypeScript. I focus on projects where the UI needs to do real work - complex state, real-time data, role-based access, performance under load. The work I enjoy most is where frontend quality actually matters: a SaaS dashboard where users spend hours every day, an eCommerce storefront where load time affects conversion, a startup MVP where the first version needs to be good enough to grow from. Clean components, predictable delivery, and code that the next developer on your team can understand without a three-hour walkthrough. If you are building a SaaS product, an eCommerce platform, or a startup MVP and need a senior frontend developer who treats your deadline like his own - I would like to hear about it.

⭐⭐⭐⭐⭐ "The final result and customer satisfaction exceed expectations" - Gleb Goloborodko, Founder, GetCode ⭐⭐⭐⭐⭐ "Their team respects our internal situation while being proactive towards upcoming issues" - Pavol Norulak, Managing Director & Co-Founder, NSI I help product teams build backend systems that scale cleanly - multi-tenant SaaS platforms, B2B product backends, eCommerce infrastructure, and async event-driven architectures that stay reliable when traffic, data, and requirements grow. 𝗪𝗵𝘆 𝗰𝗹𝗶𝗲𝗻𝘁𝘀 𝗰𝗵𝗼𝗼𝘀𝗲 𝘁𝗼 𝘄𝗼𝗿𝗸 𝘄𝗶𝘁𝗵 𝗺𝗲 • Architecture-first thinking - the right design decision on day one prevents expensive rewrites later • Milestone-based delivery with demos and documentation at every stage - no black-box development • Early risk identification - scope and budget issues surfaced before they become problems • One senior developer who also manages the project - clear communication, no handoffs, no surprises • Long-term technical partnership mindset - accountable for outcomes, not just code delivery • Production-ready from day one: test coverage, CI/CD, structured logging, error monitoring Over 8 years, my team at Angle2 and I have shipped SaaS platforms, marketplaces, CRMs, B2B portals, analytics platforms, job boards, and payment-integrated products across fintech, eCommerce, and enterprise software - on time, within scope, with full documentation. My 14+ years in project management means you get senior development combined with predictable delivery 𝗕𝗮𝗰𝗸𝗲𝗻𝗱 & 𝗦𝗮𝗮𝗦 𝘀𝘆𝘀𝘁𝗲𝗺𝘀 • SaaS & B2B backends: multi-tenant architecture, tenant isolation, row-level security, role-based access control, OAuth / authentication, audit logging • eCommerce & marketplace systems: product catalogues, order management, inventory, payment flows, webhook event handling • Payment integrations: Stripe Connect (Standard & Express), subscription billing, split-payment flows, async webhook handling • APIs: Django REST Framework, FastAPI, RESTful API design, REST API, third-party integrations (Stripe, Twilio, OpenAI, Gmail API) • Async systems: AsyncIO, Celery, Redis, background workers, job scheduling, distributed event processing • Data processing: ETL pipelines, web scraping, PDF/document parsing, bulk CSV ingestion, data workflows • Cloud & DevOps: AWS, GCP, Azure, Docker, CI/CD (GitHub Actions, GitLab CI), structured logging, error monitoring 𝗔𝗜 & 𝗟𝗟𝗠-𝗽𝗼𝘄𝗲𝗿𝗲𝗱 𝘀𝘆𝘀𝘁𝗲𝗺𝘀 • Intelligent assistants and AI-powered features using LangChain, OpenAI API, and RAG pipelines • Vector search and semantic retrieval: FAISS, Pinecone, vector database integrations • LLM workflows integrated into structured backend APIs with production stability • System architecture for AI-enabled products - reliable, scalable, maintainable 𝗦𝗲𝗿𝘃𝗶𝗰𝗲𝘀 • SaaS MVP development - system architecture through production-ready deployment • Multi-tenant platform builds - data isolation, tenant management, subscription tiers • eCommerce backend development - marketplace logic, inventory, fulfilment integrations • Payment system integration - Stripe Connect, subscription billing, webhook pipelines • AI / LLM integration - LangChain, RAG pipelines, vector search, OpenAI API • Backend architecture audits and implementation roadmaps • PostgreSQL schema design and query optimisation • Django to FastAPI migration planning • AWS / GCP cloud architecture review and cost optimisation • CI/CD pipeline setup - production-ready from day one My background is senior Python backend development - 8 years of building SaaS platforms, B2B product backends, and eCommerce infrastructure using FastAPI, Django REST Framework, AsyncIO, Celery, PostgreSQL, Redis, AWS, and GCP. I focus on projects where architecture matters from day one - multi-tenant SaaS platforms, marketplace backends, B2B portals, and eCommerce systems where scale and reliability are not optional. Beyond core backend work, I integrate LangChain, RAG pipelines, and OpenAI API into production systems - built to be stable, maintainable, and part of a real product rather than a prototype. If you are building a SaaS platform, a marketplace, a B2B portal, or a payment-integrated product and need a senior Python backend developer who manages the delivery end to end - I would like to hear about it.

$400M+ in transactions processed across platforms we built. 100,000+ tickets sold on a product shipped from zero. 20+ countries reached by an EdTech app delivered end-to-end. I'm not listing what's possible — I'm listing what's already running in production. I'm a full stack developer and software architect based in Israel, and the CEO of a 40+ engineer development agency. When you work with me, you get a senior technical partner who understands the code and the product — and a full team behind delivery when scope requires it. 🔹 Full Stack & SaaS Development Scalable multi-tenant architectures, B2B dashboards, internal tools, and AI-integrated SaaS. Core stack: React, Next.js, Vue.js, TypeScript, JavaScript, Python, Node.js, Laravel — full stack web developer depth from database schema to UI. 🔹 Fintech & Banking This is where I'm different from most full stack developers on this platform. We've built card issuing systems, treasury management platforms, AML/KYC pipelines, cross-border payment rails, and crypto-to-fiat flows. Live integrations: BlackRock, DocuSign, Salesforce, Rail API, Kraken, SEPA Instant. Production experience, not theoretical. 🔹 Mobile App Development Native iOS (Swift) and Android (Kotlin) for security-critical applications. React Native for cross-platform. My mobile portfolio includes a hardware-encrypted messenger with a built-in crypto wallet, a DeFi app, and a React Native aviation booking system — real-world apps built for real stakes. 🔹 Web3 & Blockchain EVM smart contract UIs, DeFi protocols, hardware-encrypted crypto wallets, seed-to-sale blockchain tracking, multi-chain no-code contract execution, tokenization platforms. 🔹 AI Integration LLM integrations, OpenAI API, RAG pipelines, multi-agent workflow automation, Fathom AI analytics, ClickHouse data infrastructure. I build AI as a functional product layer, not a feature checkbox. When you hire me as your full stack developer, you're not getting a solo freelancer bottleneck. You're getting a senior technical lead with backend, frontend, mobile, and DevOps teams — all behind one point of contact, one contract. Tech: Python · Django · FastAPI · React · Next.js · Vue.js · TypeScript · JavaScript · Node.js · Swift · Kotlin · React Native · PostgreSQL · MySQL · Redis · ClickHouse · AWS · GCP · Docker · Kubernetes · Solidity · Web3.js Send me a direct message to get 30-minute session to map your architecture, align on tech stack, or define your MVP roadmap before development begins.

Great to meet you all virtually! My name is Yelysaveta, and I'm here to help you unlock the full potential of your e-commerce business. I represent DevIT Group, an IT agency based in Ukraine. We are a dedicated team of Shopify Developers and Shopify Experts who focus 100% on building high-converting, scalable, and technically flawless online stores. 💡✨ We prioritize clear, transparent, and proactive communication 🤝. We treat your store's performance and conversion rates as our top priority, ensuring that your technical challenges are solved smoothly and timelines are strictly met. 🚀 Instead of generic solutions, we leverage the latest capabilities of the Shopify ecosystem to build tailored, high-performance web applications. 🌟 Core Shopify Expertise & High-Value Keywords: - Shopify OS 2.0 & Custom Theme Architecture: Crafting pixel-perfect storefronts using Liquid and JSON templates, with a strong focus on section-ready setups for effortless merchant editing. - Checkout Extensibility & Shopify Functions: Implementing modern UI extensions, custom discount rules, and advanced delivery/payment logic to replace deprecated checkout setups. - Data Architecture (Metafields & Metaobjects): Building robust structures for complex product fitering, dynamic content presentation, and advanced catalog management. - Seamless Platform Migrations: Safe and flawless transition of large catalogs (including 10k+ products) from BigCommerce, Shopware, Magento, or WooCommerce to Shopify with zero data or SEO loss. - Advanced Custom Functionality: Engineering interactive features such as real-time 3D product configurators, custom subscription models, and complex tiered/B2B pricing systems. - Headless Commerce: Building ultra-fast storefronts using Shopify Hydrogen, Oxygen, Remix, and Next.js for maximum performance. - Performance Optimization & CRO: Deep Liquid code auditing, script optimization, and application overhead reduction to achieve top-tier mobile PageSpeed scores. 🛠️ Our Targeted Shopify Tech Stack: Shopify Core & Frontend: ✓ Platforms: Shopify, Shopify Plus ✓ Architecture: Shopify OS 2.0, Liquid, JSON Templates ✓ Frontend Languages: JavaScript, TypeScript, Tailwind CSS, SASS App Development & Headless: ✓ Custom App Frameworks: Remix, Node.js, PHP (Laravel) ✓ APIs & Data: GraphQL Admin & Storefront APIs, REST Admin API, Shopify App Bridge ✓ Headless Stack: Shopify Hydrogen, Oxygen, React, Next.js Integrations & Ecosystem Tools: ✓ Payment Gateways: Stripe, PayPal, Adyen, Custom Gateway configurations ✓ Core E-commerce Extensions: Klaviyo, Subscription apps, advanced Inventory and ERP syncing, Matrixify, Search & Discovery logic We approach every contract with a product-focused mindset. We don't just write code; we optimize your customer journey to scale your revenue. 📊 Message me today, let's discuss your store's specific requirements and find the perfect technical execution for your ideas. Always happy to hear from you!

Want to actually make money from your game and turn your idea into something that brings real value, not just another app that gets ignored? That’s exactly what this is about! Games built here consistently reach 100K+ to 500K+ downloads and generate real revenue for clients, because the focus is not just on development, but on gameplay, retention, and monetization from day one. Most games technically “work” but fail at gameplay, player experience, and long-term engagement. The focus here is simple, not just mobile game development or video game development, but building a game that people enjoy playing and keep coming back to. Everything starts with how the game feels. Before scaling, the core gameplay is shaped - how players interact with the game - how levels are structured - how progression works - and why someone would continue playing after the first session Once that is clear, the game is built in Unity with a strong balance between game design and game development, making sure mechanics, UI/UX, animation, and overall flow work together as one system. From there, the focus shifts to what actually drives growth - performance across Android and iOS devices - smooth gameplay and responsiveness - and systems like rewards, leaderboards, and monetization that support long-term engagement This naturally includes working with Unity, C#, mobile game systems, gameplay mechanics, 2D and 3D environments, animation, UI/UX, and optimization, but always with the goal of building a complete product, not just features. Because in the end - a successful game is not just about launching it’s about - players staying - coming back - and spending time (and money) inside the game If you want to build a game that actually performs - message me, and let’s turn your idea into a real money making machine!

As a forward-thinking Senior Engineer and Team Leader with over two decades of experience, I work as a full stack developer specializing in Video Streaming and real-time communication solutions based on WebRTC. I combine strong architecture thinking with hands-on delivery, acting both as a technical leader and a practical full stack web developer who understands real product needs and builds scalable WebRTC-powered systems. Today, my focus as a full stack developer includes the strategic application of advanced AI technologies alongside WebRTC-based real-time communication platforms. I actively work with OpenAI APIs, Whisper for speech recognition, LLaMA2 for open-source large language models, and LangChain for building AI-driven workflows. This positions me as a full stack developer AI who can integrate intelligence directly into real-world WebRTC video and streaming products. Throughout my career as a full stack developer, I’ve contributed to Telemedicine, Online Education, and Real-time Entertainment by building WebRTC-powered communication platforms. I’ve led teams delivering webinar platforms, live chat systems, and complex real-time applications, acting both as a senior web developer and system architect who ensures scalability, security, and long-term maintainability for WebRTC infrastructures. In AI-focused projects, I operate as a full stack developer who bridges data, logic, and user experience inside WebRTC-enabled applications. My team and I integrate conversational AI, speech-to-text, and knowledge-driven systems using OpenAI, Whisper, and LLaMA2. With LangChain, we design intelligent pipelines that automate workflows and data processing, enhancing WebRTC communication platforms with AI-driven capabilities. WebRTC remains a core part of my work as a full stack developer, especially for building high-performance real-time systems. We design everything from low-latency WebRTC infrastructure to complete applications, delivering solutions that work seamlessly across web and mobile. This includes building scalable video streaming app architectures capable of handling thousands of concurrent users through WebRTC. As a full stack developer, I also provide consulting and development services across North America and Europe, helping companies design and build WebRTC-based video communication platforms. I work with companies in Entertainment, E-Learning, Healthcare, and Finance. Depending on project needs, I act as a React developer, Wordpress developer, or mobile app developer while implementing scalable WebRTC solutions. Our services as a full stack developer team include system architecture, UI/UX design, and custom development of WebRTC streaming and real-time communication platforms. We build modern interfaces, robust back-ends, and real-time systems, including secure WebRTC video stream delivery for live and on-demand use cases. We have worked with most of the major Webinar and Online Education platforms on the market, delivering solutions as a full stack developer team that understands both the business and technical sides of WebRTC video streaming products. We frequently modernize existing platforms and migrate legacy systems to scalable cloud-based architectures built around WebRTC technologies. As a full stack developer, I’ve led the creation of webinar systems, live chat apps, WebRTC video conferencing platforms, real-time video auctions, messengers, e-learning platforms, telemedicine solutions, dating apps, Twitch-like platforms, TikTok-style apps, VoD systems, and live shopping platforms. Many of these solutions rely on modern stacks including full stack developer React and full stack Lavarel approaches integrated with WebRTC. Beyond development, I support clients as a full stack developer with load testing and performance optimization for large-scale WebRTC streaming systems. My background across front-end, back-end, databases, and cloud platforms allows me to lead projects end-to-end and deliver reliable, production-ready WebRTC platforms. I invite you to collaborate with me as a full stack developer who understands AI, WebRTC, and scalable real-time product development. Together, we can build innovative WebRTC-powered solutions that align with your business goals and grow with your users.

🥇 Top 1% - Upwork Ruby on Rails & AI Solutions ✅ Expert in AI LLM OpenAI GPT ✅ Senior developer (10+ years experience) ✅ 50 completed projects & 9000 hours on UpWork! 🇺🇸 Work in PST/PDT time zone. Hi, 👋 I'm Alex! I've worked with dozens of Ruby on Rails applications, from small startups to huge production apps with millions of users. Included: SAAS, IAAS, marketplace, search engines etc. Also, I am an OSS contributor, maintaining RubyAI, kredis, cookies_eu, and other gems in the Ruby ecosystem. - Ruby and Ruby on Rails - JavaScript, React - Stimulus, Turbo, Hotwired - HTML, HAML, and HTML5 - PostgreSQL and MySQL for backend databases - Version control with Git and GitHub - SAAS, IAAS, eCommerce applications. - UX/design, SEO - DevOps (Hetzner, DigitalOcean etc)

Do you need a website? Hello there! My name is Dmitry, and I'm a freelancer out of Ukraine who specializes in WordPress design/development with more than 10 years of experience. Since November 2015, I've been working as a freelancer on Upwork. As a freelancer, I have worked with a wide variety of large businesses, small businesses, and individuals, on projects including: - WordPress / WooCommerce development (my main specialty); - Figma / PSD / Sketch designs for a different scope of websites, from landing pages to the market website; - Low-code design and development; - Front-end development (HTML, CSS, JS, jQuery, React.js); - Agile/Scrum meeting; - Provide the best solution for my customers; Please view my reviews and portfolio for a brief introduction to my work! For my full portfolio or any questions you may have regarding your project, feel free to reach out to me via message, and I will get back to you as soon as possible! Thanks for your time, and I hope you have a pleasant experience here on Upwork! Please Note: Per-Hour/Fixed-Rate Fee is flexible to change based on availability, turnaround time needed, and project scope. ATTENTION I can provide a fixed-price quote ONLY for the project from scratch. Or Figma to WordPress conversion. NOT FOR FIXES. All fixes on existing projects that were not done by me should be covered in an hourly contract.