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Yaroslav D.
$39.99/hr
100% Job Success
$200K+ earned
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𝐘𝐨𝐮 𝐝𝐨𝐧’𝐭 𝐧𝐞𝐞𝐝 $𝟐𝟎𝐤 𝐚𝐧𝐝 𝟔 𝐦𝐨𝐧𝐭𝐡𝐬 𝐭𝐨 𝐯𝐚𝐥𝐢𝐝𝐚𝐭𝐞 𝐲𝐨𝐮𝐫 𝐬𝐭𝐚𝐫𝐭𝐮𝐩 𝐢𝐝𝐞𝐚. Let’s use 𝐀𝐈-𝐩𝐨𝐰𝐞𝐫𝐞𝐝 𝐭𝐨𝐨𝐥𝐬 to build REAL-WORKING PRODUCT in 5-6 weeks so you can test the idea in the real market🦸‍♂️ We start with a 𝐟𝐫𝐞𝐞 𝐛𝐫𝐢𝐞𝐟 𝐚𝐧𝐝 𝐩𝐫𝐨𝐝𝐮𝐜𝐭 𝐚𝐮𝐝𝐢𝐭☄️ Launch the MVP, get real users and see if the product can generate revenue. If you already have a prototype or code, we’ll review it and move faster from there. 𝙁𝙖𝙘𝙩𝙨 𝙖𝙗𝙤𝙪𝙩 𝙢𝙚: 🏅Launched 500+ 𝙨𝙪𝙘𝙘𝙚𝙨𝙨𝙛𝙪𝙡 products 🏆Developed an app that generated $𝟏𝟎𝟎𝐤+ 𝙈𝙍𝙍 within the first 6 months 🚀𝙏𝙤𝙥 1% on UPWORK 🎯Created competitors for 𝙉𝙞𝙠𝙚 𝙏𝙧𝙖𝙞𝙣𝙞𝙣𝙜 𝘾𝙡𝙪𝙗, 𝙁𝙞𝙣𝙙 𝙈𝙮 (𝘼𝙥𝙥𝙡𝙚), 𝙁𝙡𝙤 and others 💲Generated over $10M 𝙞𝙣 𝙧𝙚𝙫𝙚𝙣𝙪𝙚 for my clients 𝙁𝙪𝙡𝙡 𝙡𝙞𝙨𝙩 𝙤𝙛 𝙢𝙮 𝙨𝙠𝙞𝙡𝙡𝙨: 📱 Mobile: TypeScript, React Native, Expo, React Navigation, Redux, Apollo, GraphQL 🖥 Web: TypeScript, JavaScript(ES5, ES6, ES7), React.js, Next.js, Redux, SASS/SCSS, GraphQL, REST 🔧 Build tools, package managers: npm, yarn, Eslint, Prettier, Flow, Husky 🗄Testing: Jest, Mocha, Detox 🚀AI Tools: Claude Code, Cursor, ChatGPT, Open Claw Having over a decade of experience, I can also cover app design, app marketing, mobile app development, website, shopify, wordpress, full stack developer. 𝘾𝙡𝙞𝙘𝙠 𝙩𝙝𝙚 𝙜𝙧𝙚𝙚𝙣 "𝙎𝙚𝙣𝙙 𝙖 𝙢𝙚𝙨𝙨𝙖𝙜𝙚 𝙗𝙪𝙩𝙩𝙤𝙣" 𝙖𝙣𝙙 𝙛𝙚𝙚𝙡 𝙛𝙧𝙚𝙚 𝙩𝙤 𝙡𝙚𝙩 𝙢𝙚 𝙠𝙣𝙤𝙬 𝙖𝙣𝙮 𝙤𝙩𝙝𝙚𝙧 𝙙𝙚𝙩𝙖𝙞𝙡𝙨 𝙮𝙤𝙪 𝙩𝙝𝙞𝙣𝙠 𝙢𝙞𝙜𝙝𝙩 𝙗𝙚 𝙧𝙚𝙡𝙚𝙫𝙖𝙣𝙩. As a full-stack React Native Developer with 20,000+ hours of hands-on experience across mobile and web platforms, I specialize in React Native, Flutter, React.js, React Native Mobile, React Native Expo, React Native Firebase, React Native WebRTC to build mobile apps. This React Native Developer / React Native Engineer has deep expertise in front-end development using Vue.js, Angular, Next.js, and Laravel to deliver responsive. Over 10 years, this React Native Developer has partnered with 30+ teams across the world - shipping 100+ projects with measurable results. As a React Native Developer operating at the intersection of mobile and full-stack development, I bring 20,000+ hrs of engineering expertise in React Native mobile architecture, Expo, React Native Firebase, and React Native WebRTC. This React Native Developer has delivered mobile app development solutions across fitness, fintech, and neo-banking verticals, working alongside flutter developers, android engineers, and Kotlin specialists to ensure cross-platform quality on every build. In addition to mobile expertise, this React Native Developer extends deep capability into backend development — MERN, Node.js, Laravel, Python with Django, and Ruby on Rails — enabling end-to-end delivery across 100+ projects without switching teams. As both a react developer and full stack developer, this React Native Developer has led architecture decisions for scalable REST APIs, Python REST API integrations, and database systems (MySQL, MongoDB) for clients across 30+ global teams. This React Native Developer has also designed and optimized 100+ WordPress and Shopify websites for SEO and conversion, working as both a Shopify and WordPress front-end developer. As a React Native Developer who understands the full product lifecycle, I integrate Auth0, Stripe payment systems, and blockchain modules while leveraging Webflow and Elementor for custom web experiences — delivering cohesive digital products from mobile app to web. With 20,000+ hours logged as a Senior React Native Full Stack developer, I specialize in React Native Expo (expo), React Native Firebase, React Native WebRTC, and React Native Engineer workflows across iOS and Android. This React Native Developer has shipped 100+ mobile app development react native apps spanning flutter mobile app development, ios mobile app development, and android — bringing a flutter developer and kotlin perspective to every cross-platform architecture decision. As a React Native Developer with full-stack depth, I excel in Node.js, Express.js, and PHP (including Laravel), alongside RESTful API and payment system integration. Across 100+ delivered projects, this React Native Developer has built cross-platform React Native mobile apps using Expo to streamline deployment — a mobile developer who coordinates with business analyst, Laravel, and python developer collaborators to build complete products efficiently. With a background in WordPress, this React Native Developer builds custom themes, plugins, and WooCommerce stores while optimizing for speed and SEO. As React Native Developer who covers - Bootstrap, SQL, React Native mobile, Wordpress, Software Development, React Native Firebase, React Native WebRTC, jQuery, Node.js - I use React Native as the primary framework. Also I have 100+ apps done with React Native UI UX stack and ready to assist you! Upd: 01/07
Yaroslav D. has worked .
Roman L.
$35/hr
100% Job Success
$10K+ earned
Available now
Offers consultations
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✅ Claude Certified Developer ✅ AI developer with 15+ years of experience ✅ Delivered products that generated $1.6M+ in income for clients Still scrolling through a long list of AI developers? Don’t waste your time - just message me 😉 💡 How I work Every project starts with the business goal and ends with a maintainable, production-ready system: • define the AI use case and success metrics • choose the right approach: LLM, RAG, machine learning, classifiers, automation, or hybrid systems • build a clean pipeline: ingestion → validation → storage → retrieval • implement guardrails: safety, formatting, validation, fallback logic • ship with monitoring, iteration, and cost control 🔧 Tech Stack • AI / LLMs: OpenAI API, Claude Code, Lovable, Cursor, LangGraph, LangChain, embeddings, vector search, RAG, AI agents • Machine Learning / Data Work: model pipelines, classification, enrichment, data processing, evaluation workflows • Backend: Node.js, NestJS, Express.js, .NET, Python • Frontend: React, Next.js, Angular • Data: PostgreSQL, MySQL, MongoDB • Automation: n8n, Playwright • Cloud & DevOps: AWS, Azure, Docker, GitHub Actions • Product Integrations: Stripe, Supabase, Firebase, Twilio, QuickBooks, Google Maps, Puppeteer, and more I build backend systems, data processing, automation, and AI workflows. As a web developer, I build the product layer around the AI so the whole system works smoothly for actual users. And with a data scientist perspective, I pay close attention to data quality, model behavior, and decision logic, because weak inputs create weak AI. Recent successful AI-powered projects: 1️⃣ Lead Data Management Tool Large-scale extraction and enrichment pipeline with automated cleaning and classification • Uploading 50× faster • 184M+ records processed • Performance improved by 38% 2️⃣ AI-Powered Investment Mobile App AI-driven insights and personalization for faster decision-making • 70% less time spent managing investments • 3× more successful outcomes 3️⃣ Real Estate AI Assistant NLP-powered recommendations for faster matching and better engagement • Shortlisting 69% faster • Engagement increased by 184% 🧲 Industries I’ve delivered AI for: SaaS, FinTech, Healthcare, Construction, Logistics, Telecommunications, Oil & Gas, Real Estate, MarTech, and other operations-heavy businesses. 👉 If you need an AI developer, AI consulting services, web developer, or someone with solid machine learning and data scientist thinking who can ship stable, production-safe AI features, let’s build it.
Roman L. has worked .
CodeGeeks Solutions
Associated with
CodeGeeks Solutions
$80K+
earned
Maksym G.
$33/hr
100% Job Success
$600K+ earned
Available now
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I am a Senior Fullstack Developer with over 15 years of hands-on experience in building and scaling Java , C# / Net , Angular applications for startups, enterprises, and SaaS platforms. Currently, I’m working as the Chief Technology Officer at InventorSoft, a software development agency specializing in web and mobile solutions. I bring a strategic mix of technical depth, team leadership, and product vision to every project. Why hire me🧐: 📌 Expert in Scalable Java and .Net Architectures - Over 15 years of experience in developing Java, .Net, C#, Angular scalable applications from different domains. - Backend systems built with Spring Boot (15+ years) – Delivered scalable microservices and high-performance business logic for enterprise-grade applications. - ORM & data access with Hibernate – Applied advanced ORM techniques for efficient database interactions, query optimization, and data integrity in distributed systems. - Frontend development with Angular & Thymeleaf Designed and delivered 200+ robust backend systems for SaaS products, e-commerce platforms, and enterprise clients. 📌 Cloud-Native Platform Engineering Specializes in building secure, scalable, cloud-native platforms using leading cloud providers: - 8+ years of production experience with AWS – Deployed scalable, secure, and high-availability applications. - 9+ years of hands-on Azure expertise – Delivered enterprise-grade solutions with Azure App Services, Azure DevOps, and SQL/Azure Storage. - 5+ years of experience on Google Cloud Platform (GCP) – Built and deployed containerized microservices using GKE, Cloud Run, and Firebase. 📌 API-First & Cloud-Native System Design - Strong background in API integration and microservice architecture. - Created high-performance APIs for platforms serving 50K+ users, ensuring seamless third-party integration and scalability. - Experienced in Docker & Kubernetes, enabling CI/CD pipelines and resilient containerized systems. 📌 Full-Stack Leadership & Agile Team Management - Led and mentored teams of 5–25 developers through all stages of the SDLC—requirements gathering to deployment and maintenance. - Specialized in building cross-functional teams for backend-heavy systems, modern UIs (React, Angular, Thymeleaf), and DevOps automation. My latest achievement as a Software Architect: 🤝 Partnered with 45+ SaaS companies to design and deliver secure, scalable platforms using Spring Boot, AWS, and modern cloud services. 🚀 Helped 10 tech startups scale from MVP to production—selecting the right tech stack, defining cloud-native architecture, and assembling strong dev teams. 💼 Enabled 5 client acquisitions through the development of enterprise-grade software that attracted major buyers and investors. 🏭 Led a digital transformation project for a multi-billion-dollar oil company, delivering a secure, API-first platform that automated mission-critical operations. 🧩 Technologies I Specialize In - Languages/Frameworks: Java, C#, .Net, Spring Boot, Hibernate, Thymeleaf, .Net Core - Cloud Platforms: AWS (8+ years), Azure (9+ years), Google Cloud (5+ years) - DevOps Tools: Docker (7+ years), Kubernetes (5+ years) - Integration & Architecture: RESTful API integration, microservices, clean architecture, CI/CD pipelines Clients that I am proud of: 💻 Shoeby – A fashion retail platform focused on modernizing the e-commerce experience with intuitive UI, product personalization, and seamless shopping journeys. 💻 CellRebel – Provides advanced mobile network analytics, helping telecom companies improve coverage and performance based on real user data. 💻 Blade – A technology-powered aviation company offering urban air mobility services, including helicopter and seaplane flights. 💻 Matics – A real-time operational intelligence system for manufacturers, offering production insights and process optimization across the factory. 💻 MedischeScholing – A medical e-learning platform that enables healthcare professionals to access, register for, and track accredited training and certifications. ➡️ Learn more about other projects on the InventorSoft portfolio Keywords: Java, Backend, Developer, Fullstack, Web, Cross-Platform, Mobile, Application, AI, OpenAI, Service, App, Development, Engineer, Integration, Build, Website, Expert, Spring boot, MySQL, Development Team, Integrated, SaaS Platform, remote, Full-stack, Senior, Software, Client Management, GraphQL, API, .NET, Asp.net, Programmer, Technical Lead, Dashboard, MVC, Developers, ASP.NET, AspNetZero, core, software, MAUI, C#, Angular, .Net, Core, Principal, Performance, Scalability, Microsoft, Blazor, SQL, Server, Frontend, React, Ruby on Rails, RoR/React, front-end, Tailwind, feature, JavaScript, ROR, TailwindCSS, Technical Staff
Maksym G. has worked .
InventorSoft
Associated with
InventorSoft
Maksym B.
$33/hr
100% Job Success
$90K+ earned
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AI-Leveraged Delivery — ship 2× faster ⚡ Most developers say they're "fast." Then the staging environment shows up in week six. I do it differently — and I can show you the receipts. 🧾 ◆ 100% Job Success Score | Top Rated Plus | Full Stack Developer | React Next.js | Front End Developer ◆ I've been doing Software Development for 8+ years. In that time I've worked on everything from quick Landing Pages to multi-year SaaS platforms - and the thing that's stayed consistent is that clients get a working product, not a list of reasons why it's late. I work as a Full Stack Developer and Front End Developer, which means I'm comfortable owning the whole thing. React and Next.js are where I spend most of my time, but the stack goes deeper: Node.js, Python, PHP, Laravel, TypeScript, MongoDB, MySQL, PostgreSQL, SQL - whatever the project actually needs. I don't have a favourite technology. I have a favourite outcome: software that ships and works. ◆ FRONT-END DEVELOPMENT Front-End Development is my home base. I work with React, Next.js, Vue.js, Angular, JavaScript, TypeScript, HTML, HTML5, CSS, CSS 3, Bootstrap, jQuery, Redux, and Workbox.js for PWA builds. Web Design and Responsive Design aren't an afterthought - I work from Figma and Adobe Photoshop and care about how things look and feel across every device. PSD to HTML conversion, Front-End Development Framework setup, pixel-accurate implementation - all part of the job. ◆ FULL-STACK & BACK-END As a Full Stack Developer I connect the front end to a real backend: Node.js, Python, PHP, Laravel, NestJS, REST API, API Integration, SQL, MySQL, MongoDB, Database Architecture, Git, CI/CD. I've set up auth systems, payment flows via Stripe, third-party API Integration, and backend logic that doesn't fall over when traffic spikes. ◆ WHAT I BUILD ◆ SaaS platforms and Web Applications - React, Next.js, TypeScript, Redux, Tailwind, clean Web Design, fast load times, and Responsive Design that holds up on every screen ◆ AI-powered products - RAG pipelines, chatbots, OpenAI and Claude API Integration, document processing tools, pgvector retrieval ◆ E-commerce and WordPress - WooCommerce, custom themes and plugins, PSD to HTML, Web Development that converts ◆ Landing Pages and marketing sites - HTML5, CSS 3, Bootstrap, jQuery, Responsive Design, conversion-focused Web Design built for speed ◆ React Native mobile apps - cross-platform iOS and Android, shared codebase, App Store and Google Play ◆ Web Developer work across the full stack - API, Database Architecture, Laravel and PHP backends, Node.js services ◆ INDUSTRIES I've shipped projects across fintech and payments, healthcare and medical platforms, e-commerce and retail, EdTech, real estate, logistics and delivery, SaaS and B2B tools, marketplaces, social platforms, media and streaming, legal tech, travel and booking, fitness and wellness, and non-profit. Most verticals at this point. ◆ HOW I WORK I communicate early and directly. If scope is unclear I'll say so before we start, not after week four. If an approach won't work I'll tell you - and offer an alternative. Staging live in week one, weekly updates, clean code your next developer won't hate. ◆ RELATED EXPERTISE Full Stack Developer: web developer, react developer, wordpress developer, mobile app developer React Next.js: nestjs, workbox.js, web developer, front end developer Front End Developer: web developer, full stack developer, react developer, react ◆ READY TO START ASAP
Maksym B. has worked .
Coralsoft: Premium AI-Leveraged Software Development, Reliable Partner, Go-to-Market Strategy
Associated with
Coralsoft: Premium AI-Leveraged Software Development, Reliable Partner, Go-to-Market Strategy
$100K+
earned
Vadym K.
$35/hr
100% Job Success
$1M+ earned
Available now
Offers consultations
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I am a .NET full stack developer and software architect with 8+ years of experience building scalable web applications using ASP.NET Core, Angular, C#, TypeScript, Microsoft SQL Server, Azure, and modern cloud technologies. Across 35+ projects in defence, renewable energy, fintech, e-commerce, and enterprise SaaS development I have delivered systems that handle real production load, not just demo traffic. What I build as a .NET full stack developer My deepest work is in ASP.NET Core back-end development. I spent years as the lead .NET full stack developer on a platform managing thousands of wind and solar energy installations globally, processing massive volumes of real-time data, building microservices on .NET Core and Azure, and reducing critical downtime incidents by over 40% through improved monitoring and analytics. On another project I built a Loan Origination System in ASP.NET Core that automated the entire loan lifecycle from lead capture to loan issuance, integrating with HubSpot, external CRMs, and RESTful APIs on Microsoft Azure. The client went from manual processing to a fully automated fintech pipeline handling 550+ active applications, cutting processing time by 60%. ASP.NET developer work across enterprise and defence Some of my most complex work as an ASP.NET developer has been in defence and industrial sectors. I modernized a legacy web platform for a company managing 36 high-uptime naval fleet assets, warships that cannot afford downtime. The ASP.NET MVC rebuild reduced manual reporting time by 70% and enabled real-time asset tracking, secure document storage, and streamlined access to sensitive operational data. On another engagement I took over a large workplace management SaaS development project built by a single developer who had left, no documentation, weekly outages, daily hotfixes. I stabilized the ASP.NET Core back-end, eliminated the performance bottlenecks, and reduced unplanned incidents from weekly to zero within two months. ASP.NET Zero and enterprise acceleration ASP.NET Zero is my go-to when enterprise clients need multi-tenancy, role-based permissions, and audit logging without spending the first three sprints on boilerplate. I have used it to accelerate SaaS development on projects in pharma automation, workplace management software, and industrial IoT, cutting initial setup time by 3+ weeks and letting the team focus on actual business logic from day one. On average my clients ship their first production release 30% faster on ASP.NET Zero compared to building from scratch. Full-stack web development across the whole system As a .NET full stack developer I own the entire delivery, ASP.NET Core back-end, Angular or React front-end with clean web design, Microsoft SQL Server and PostgreSQL database design, and Azure infrastructure. I built a Shopify fulfillment tool in ASP.NET Core and React that reduced packing mistakes to zero and cut order processing time by 35%, integrating barcode scanning, inventory management, and connections to 8+ shipping providers. I delivered a fleet management system in .NET Core and Angular handling 1,250+ assets and 845 active rentals simultaneously, with automated reporting that saved operations teams 10+ hours per week. On the front end I work with Angular, React, TypeScript, JavaScript, Next.js, HTML, CSS, Bootstrap, and RESTful API integration, connecting them cleanly to .NET back-ends without creating maintenance nightmares six months later. C# and .NET developer engineering that goes deep Back-end development across 8 years as a .NET developer means I have seen what breaks under real load. I cut a US e-commerce platform's page load time from 8 seconds to 2, directly contributing to a 2x increase in sales. I optimize Microsoft SQL Server and PostgreSQL queries, regularly reducing query execution times by 60-80%, design database schemas that support complex reporting, and build API integration layers connecting .NET systems to CRMs, ERPs, payment gateways, and third-party platforms. I work with Node.js for event-driven services, TypeScript to keep large codebases maintainable, and Python or PHP when projects need scripting layers alongside the core .NET stack. For web development infrastructure I use Microsoft Azure and Amazon Web Services, Docker containers, microservices architecture, and CI/CD pipelines that reduced deployment time by 50% for several enterprise clients. Why clients come back I have worked with clients in Germany, the USA, Australia, the UK, Norway, Denmark, and the Netherlands across renewable energy, defence, fintech, e-commerce, and industrial IoT. What stays the same: I ask the right questions before writing the first line of code, flag problems early, and deliver .NET full stack applications that work in production, not just in development. If you are scaling a SaaS product, modernizing a legacy system, or need a .NET full stack developer your team can build on, let us talk.
Vadym K. has worked .
Eastoner
Associated with
Eastoner
$500K+
earned
Yuliia U.
$35/hr
92% Job Success
$300K+ earned
Available now
Offers consultations
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👋 Hi, I'm Julia from Koitechs - Top Rated Plus Upwork team focused on React, Next.js, Node.js, React Native, TypeScript, Supabase, PostgreSQL, and AI product development. My main goal is save up to 40% of our budget to get a market-ready, stable and scalable product. I help companies hire in-house, CTO-approved engineers who join fast, take ownership, and deliver production-ready software. ✅ 9+ years in software development ✅ 155+ web and mobile projects delivered ✅ 20,500+ Upwork hours in React / Next.js / Node.js / React Native ✅ 75% repeat clients ✅ Engineer matching in 24 hours or less ✅ 2-week trial period ✅ 35+ in-house engineers ✅ 40+ MVPs released ✅ Products supported by our team include platforms with 5M+ daily users 🚀 React / Next.js / Full Stack We build SaaS platforms, marketplaces, dashboards, admin panels, CRMs, AI products, and scalable web apps using React, Next.js, Node.js, TypeScript, Supabase, PostgreSQL, Firebase, MongoDB, REST API, GraphQL, Stripe, OAuth, WebSockets, AWS, Vercel, and Docker. Our team is a strong fit if you need a react developer , web developer , full stack developer , nextjs developer, mern developer, or backend engineer. We help with MVP development, legacy code takeover, architecture modernization, Core Web Vitals, API integrations, payments, auth, subscriptions, user roles, and production launch. 📱 React Native / Mobile We build and support iOS and Android apps using React Native, Expo, Firebase, Supabase, Node.js, and API-driven architecture. We can help if you need a react native developer , mobile app developer, iOS / Android support, app takeover, mobile maintenance, push notifications, App Store / Google Play releases, payments, or backend integrations. We also support mixed mobile environments with flutter developer , android developer , backend developer, AI developer, or web developer. 🤖 AI SaaS / AI App Development We build AI-powered products connected to real business workflows. Experience: AI SaaS, AI MVPs, AI chatbot development, AI agent development, OpenAI API, Claude API, LLM prompt engineering, RAG, automation, web scraping, AI model integration, copilots, and AI workflow validation. AI stack: OpenAI API, Claude API, LLMs, RAG, AI Agent Development, AI Chatbot, Generative AI, Python, FastAPI, Supabase, PostgreSQL, pgvector, automation, data analysis, web scraping. 🧩 Mixed-Stack Support Our core focus is React, Next.js, Node.js, React Native, TypeScript, Supabase, and AI. We also support products involving wordpress , vue , angular , python developer , scala developer , flutter developer , android developer , mern , and other web/mobile technologies. 🏆 Industries 📦 Logistics - 5+ projects: tracking, shipment dashboards, carrier/shipper workflows, maps, route visibility. 🏥 HealthTech -4+ projects: medical booking, clinic platforms, patient flows, admin systems. 🛒 Marketplaces & E-commerce - 15+ projects: multi-vendor products, Stripe, subscriptions, bidding, complex search. 🏠 PropTech / Real Estate -5+ projects: listings, booking flows, agent dashboards, rental platforms. 🤖 AI Startups - 25+ AI products/features: AI SaaS, chatbots, agents, copilots, OpenAI / Claude integrations. 💰 FinTech - 3+ projects: Stripe Connect, billing, payment flows, invoicing. 🎮 Gaming - 5+ projects, including 2 major global gaming brands: dashboards, analytics, real-time interactions. 📚 EdTech - 5+ projects: student dashboards, progress tracking, content platforms. 📣 MarTech - 1 global market-leading project: dashboards, analytics, segmentation, workflows. ⚽ SportsTech - 10+ projects: live data, dashboards, events, rankings, stats, mobile apps. 📌 How We Work 1️⃣ Discovery & technical planning 2️⃣ Engineer matching within 24h 3️⃣ 2-week trial period 4️⃣ Weekly demos and reports 5️⃣ CTO-approved delivery with code review and QA 6️⃣ Long-term support after launch 🚀 Building a SaaS, MVP, marketplace, React app, Next.js platform, React Native app, AI product, or mixed-stack web/mobile platform? Click “Invite” or “Hire” - I’ll help you clear the estimate or discovery phase within 24 hours or less.
Yuliia U. has worked .
Koitechs 💡 JavaScript experts 💡 React. js + Node. js
Associated with
Koitechs 💡 JavaScript experts 💡 React. js + Node. js
$700K+
earned
Ihor A.
$45/hr
100% Job Success
$500K+ earned
Available now
Offers consultations
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I provide a Node.js Backend Developer team that ships production-grade SaaS, APIs and platforms. 11,000+ hours worked, 50+ Node.js Backend Developer projects delivered, 100% Job Success Score, Top Rated Plus. As CEO I scope and own every Node.js Backend Developer engagement we sign. I study the brief, run discovery with founders, match the right engineers and stay accountable for delivery. My team owns the code - I never touch it. So when a brief lands for a Backend Engineer, an API Developer or a full stack software engineer, I scope it and the team builds it. Why hire my team: - 20+ years of Node.js Backend Developer, Full Stack Developer and SaaS Developer delivery - 200+ Node.js Backend Developer and SaaS Developer projects shipped - Long-term clients on retainers (3 - 10+ years) Our Node.js Backend Developer team designs services, REST and GraphQL APIs, queues and event pipelines that hold up under real production load. A NestJS Developer on the team treats Node as a serious production runtime and owns the heavy backend modules. Typical engagements: multi-tenant SaaS APIs, real-time platforms, billing flows, data pipelines, AI-backed services. Stack: Node.js, NestJS, ExpressJS, TypeScript, PostgreSQL, Redis, Elasticsearch, AWS, GCP, Docker, Kubernetes. Our Full Stack Developer team owns systems end-to-end - one team handling Node.js services, React frontends, data models and infra. A React Node pairing is our default shape - a React Node frontend on a NestJS Developer backend, with a nextjs developer on SEO-critical pages. We replace fragmented setups where a website developer, web developer and front end specialist were stitched together. Adjacent angles I present daily: full stack developer saas for B2B platforms, python full stack developer pairings for data and AI, full stack developer ai integrations, full stack developer react teams for SaaS dashboards, full stack developer shopify extensions, full stack web developer rebuilds of legacy SPAs, full stack ai saas developer engagements where LLM features must ship at production standard. Our SaaS Developer team helps founders ship multi-tenant SaaS and B2B platforms. A SaaS Developer engagement covers auth and RBAC, Stripe billing, observability, anti-abuse and event tracking the saas marketing team can use. The team has shipped a webflow developer saas pairing, a b2b saas booking system developer engagement, a ui ux designer saas pipeline, a saas explainer video flow in onboarding and a saas sales console wired into the backend. On the API side a dedicated API Developer track owns contracts and versioning. A REST API Developer designs the REST API Developer surface - resources, pagination, idempotency, webhooks - and the API Developer keeps SDKs and docs honest. A Backend Engineer owns the data layer; a second Backend Engineer covers queues and workers so the API never blocks on jobs. Cross-language coverage. A python developer track owns scraping, ETL and AI workflows. python nodejs migrations land here when teams consolidate dual stacks. flutter node.js and vue.js node.js setups join the core when mobile or admin SPAs need a reactive layer. A react developer pairing handles SaaS dashboards on the API. A wordpress developer or shopify developer hand-off covers CMS migrations. A mobile app developer pairing extends the SaaS into iOS and Android. Clients hire me when they need: - a Node.js Backend Developer team that owns architecture, APIs and scaling - a back end developer node.js bench for high-traffic SaaS - a Full Stack Developer team replacing 3 - 5 contractors with one coherent system - a SaaS Developer team fluent in multi-tenancy, auth, billing and RBAC - an API Developer and Backend Engineer pair for a clean, versioned REST API Developer surface - a full stack software developer practice with CEO-level discipline on roadmaps - a website developer hand-off backed by the team Recent work my team shipped: - Cybersecurity SaaS. Node.js, NestJS, PostgreSQL, Redis on GCP + Kubernetes. 170M+ req/week, 500 RPS peaks, 1M+ MAU. - Device Verification SaaS. Single backend powering web, Telegram bot and Developer API. 4K+ DAU, 1M+ checks, 80%+ via API. - Clinic Enterprise platform. React, Next.js, Laravel, Node.js, Redis, AWS. REST API, queues, RBAC, 1C and lab integrations. MVP in 4 months for 500 patients/day, 500K records. - E-commerce Data Pipeline SaaS. 50M+ products, per-partner parsers, dedup. Cloud cost cut ~9x at sub-second search across 300 - 500K DAU. - Multi-currency Voting SaaS. Wallets, Stripe top-ups, real-time vote locking over WebSockets. 2M+ users in 10 countries, $2.5M+ revenue. Reliable SaaS comes from deliberate design - that's what my Node.js Backend Developer, Full Stack Developer and SaaS Developer team focuses on. Need a Node.js Backend Developer team, a Full Stack Developer team or a SaaS Developer partner that delivers on time and stays long-term - let's talk.
abz.agency®
Associated with
abz.agency®
$800K+
earned
Igor T.
$35/hr
100% Job Success
$300K+ earned
Available now
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I build enterprise .NET, MERN, and full-stack systems, Azure cloud architectures, and Microsoft SharePoint + Power Platform solutions that eliminate manual work - software engineer with 12+ years of experience, 7,000+ hours on Upwork, and a 100% Job Success Score. If your team runs on Excel and manual approvals, I help you automate it properly with AI-powered tools and scalable web platform architecture. Microsoft Power Platform (workflow automation) I help teams modernize operations with Microsoft Power Platform without turning it into an unmaintainable patchwork. Power Apps + Power Automate + Microsoft SharePoint + Dynamics 365: apps, workflows, and integrations that eliminate manual work. Whether you need a full app development cycle or targeted Automation for Microsoft 365, I deliver connected solutions that scale. Back-End Engineering ( .NET Core, Node ) My deep expertise lies in the .NET Core ecosystem and Node.js, where I've worked extensively with .NET Framework, ASP.NET Core, C#, Entity Framework, and Microsoft SQL Server. Key achievements: ▪️Delivered 50+ enterprise-level .NET Core and Node applications, improving business process efficiency by 35–70% through automation, optimized logic, and scalable architectures. ▪️Built 80+ RESTful and SOAP-based APIs powering real-time integrations with CRMs, ERPs, payment gateways, IoT devices, and mobile apps. ▪️Optimized 250+ SQL databases, including data warehouse architectures, increasing query performance by up to 10× and ensuring 99.9% uptime in production. ▪️Designed secure, cloud-native systems using Azure App Services, Azure Functions, Azure Event Hub, Azure Service Bus, Azure SQL, and Azure Application Insights. ▪️Implemented clean architecture, DDD, and TDD to create maintainable, long-lasting systems that scale. Front-End & Full Stack Web Application Development On the front end, I design and build modern, responsive web application interfaces using HTML5, CSS3, JavaScript, TypeScript, Bootstrap, React, Next.js, and Angular. As a frontend engineer, I focus on performance, accessibility, and seamless back-end integration. Key achievements: ▪️Delivered 40+ fully responsive web platform applications using Angular, Next.js, and React, integrated with ASP.NET Core back ends. ▪️Built 30+ MERN stack ( React, Next.js ) mobile-friendly UI experiences, improving user engagement and retention by up to 60%. ▪️Implemented UI performance tuning that reduced load times by up to 50%. ▪️Delivered full stack developer-level hybrid solutions: React, Next, or Angular front ends powered by C# / ASP.NET / MongoDB services, reducing costs and improving time-to-market for SaaS platform and web application projects. Azure Cloud, Power BI & Data Analytics I design complete Azure cloud environments and end-to-end data analyst-grade analytics systems: Azure infrastructure: ▪️Azure App Services, Azure SQL, Azure Cosmos DB (with MongoDB API compatibility) ▪️Azure Functions, Logic Apps, Service Bus, Event Hub ▪️Azure Storage, Azure Active Directory, Key Vault ▪️CI/CD pipelines with Azure DevOps and GitHub Actions ▪️AWS migrations and hybrid cloud architectures ▪️Azure Data Factory pipelines for ETL and data warehouse integration Power BI | Looker Studio & dashboard analytics: ▪️30+ automated dashboard solutions with KPI Dashboards for operations, finance, and logistics ▪️Data analyst-ready models integrating Azure SQL, Azure Data Factory, and Azure Data Lake ▪️Report automation replacing manual Excel and Tableau-style workflows with live Power BI dashboards ▪️Looker Studio integration for clients on Google ecosystem alongside Azure stacks ▪️Data visualization layers connecting data warehouse, Azure SQL, MongoDB, and operational databases into unified KPI Dashboards ▪️AI-Powered Solutions & Modern App Development I integrate AI-powered capabilities into enterprise workflows: ▪️Chatbot development using Azure Bot Service, OpenAI API, and custom NLP pipelines for customer support, internal helpdesks, and ERP assistants ▪️AI-powered document processing and classification integrated with Microsoft SharePoint Power Automate, MERN stack ▪️MVP development for SaaS platform products: from concept to deployed web application in weeks ▪️Tool development for automation, monitoring, and reporting, replacing manual analyst work with intelligent pipelines 💡Business Impact My work is focused on measurable outcomes, not just code: ▪️+40% e-commerce sales through performance optimization and React / Next.j checkout redesign ▪️25% lower infrastructure costs for a SaaS platform after migrating to microservices using .NET Core + Azure ▪️Reduced manual reporting time by 80% via automated Power BI, Looker Studio + Azure Data Factory pipelines ▪️Delivered Automation System solutions cutting manual data entry by 60% across logistics and healthcare clients I ensure your systems are future-ready, secure, and efficient, so "INVITE" me for your job!
Igor T. has worked .
Reenbit Microsoft-Certified Agency
Associated with
Reenbit Microsoft-Certified Agency
$300K+
earned
Yurij M.
$35/hr
100% Job Success
$300K+ earned
Available now
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😣 Tired of AI-generated text? 📞 Let's talk for real. 🎯 Forget fancy profile descriptions I focus purely on results. 🔥 ACHIEVEMENTS ✔️8+ years and 42+ products as a Full Stack Developer React Node in SaaS Platform, MVP, AI-Powered and Web Application delivery ✔️$3.8M+ client impact, $900K+ direct revenue, €420K paid MVP orders, £11M annual business volume as a React Developer ✔️20,000+ active users across Web + Mobile Apps where Frontend React Developer execution with n8n supabase lifted engagement by 18–27%. ✔️10,000+ users in Healthcare Web Application and HIPAA-Compliant systems where Frontend React Developer (flutterflow, v0, aws) ownership cut admin friction by 40%. ✔️2,423 completed orders, 489 registered customers, 34% faster handling in Ecommerce Website and CRM Platform MVP as a Full Stack Developer React Node. ✔️90% faster order processing, 80% lower manager workload, 65% fewer back-office actions through Workflow Automation, Document Workflow, and Frontend React Developer improvements. ✔️1,666+ catalog items, 4-role access, 2.7x operational capacity in B2B Marketplace and Registration and CRM System as a Full Stack Developer React Node. ✔️5–8 weeks shorter MVP to Pilot Launch, 35% fewer bugs through Existing Codebase and Productionise work as a Full Stack Developer React Node ✔️$900K+ in client revenue as react next js developer, and 8 years of experience as web app developer react / react app developer ✔️8+ yrs. Senior Full-Stack Engineer ✔️$3.8M+ client impact, end-to-end ownership as Full Stack Developer React Node ✔️20+ interfaces, 18–27% engagement lift, clarity and trust as Frontend React Developer ✔️30–40% faster cycles, cleaner UX, stronger retention across SaaS Platform products as React Developer 🚚 WHERE I DELIVER ✔️As a Frontend React Developer - 20+ systems with UI Development, UI/UX, Dashboard Build, Responsive UI Build across SaaS Platform, Booking Platform, Ecommerce Website. ✔️As a React Developer - 15+ launches in full stack developer nextjs environments, 30–40% faster iteration through Design-to-Code and Component Development. ✔️As a Full Stack Developer React Node - 25+ end-to-end builds with Backend API, Backend System Development, Data Architecture, Secure, Scalable architecture from Early-Stage MVP to Live SaaS Platform. ✔️As a frontend developer react, front end developer react, react native expo - web design, UI Polish ( ux designer ), front end development improving conversion by 15–22%. ✔️10+ deployed mobile app in app and google play store as react native developer expo, react native app developer. ✔️ 12–19% better repeat usage through booking, notifications, payments as front-end developer flutter and mobile app developer. ✔️As a frontend developer angular, python developer, python full stack developer django - 12+ backend-heavy products, 28% lower delivery risk. ✔️As a Full Stack Developer React Node - 6–18 month cycles through Scale Existing Platform, Professionalize & Scale, Review, Improve & Launch as a Long-Term Development Partner. ✔️As a full stack react developer and full stack developer supabase react - 99%+ delivery consistency across distributed teams. ✔️10+ projects with twilio api in full stack development (full stack developer supabase) 🏆 INDUSTRY IMPACT - Marketplace Platform, B2B Marketplace, Two-Sided Marketplace, B2B Services - thousands of listings, 20%+ better lead quality as a Frontend React Developer and Full Stack Developer React Node. - Healthcare Web Application, Clinic Management SaaS, Telehealth, HIPAA-Compliant - 10,000+ users, 25%+ better staff capacity as a Frontend React Developer - AI-Powered - 5+ products, Custom AI Solutions, AI Agent Platform, AI Chatbot, RAG Chatbot, OpenAI, Claude API, FastAPI as a React Developer and Full Stack Developer React Node. - Logistics Platform, ERP, Internal Workflow Management System, Owner Dashboard - hours saved per order cycle, 30%+ faster reporting as a Full Stack Developer React Node. - Research Platform, LegalTech SaaS, Fintech MVP, PropTech MVP - 18% better adoption through Frontend React Developer quality and structured permissions. - Wellness Marketplace, Rental Platform, Automotive Marketplace - scalable Multi-Vendor Ecommerce and React PWA patterns, 3–5 weeks faster time-to-market. ⚒️ HOW I BUILD ✔️25+ products as a Frontend React Developer: java react, react.js, react native mobile, react next tailwind frontend, javascript, typescript, html, html5, css3, Tailwind CSS, React Bootstrap frontend, Responsive Design, jQuery. ✔️15+ systems as a Full Stack Developer React Node: supabase postgres, laravel, MySQL, MongoDB, firebase, stripe. Integrations across payment, maps, auth, and third-party APIs. ✔️10+ ecosystems: wordpress developer, shopify, web3 frontend, php, .net, flask, vue.js, svelte, webflow, mern stack as a react js developer and react web developer. ✔️40+ products: git, Software Development, Software Architecture & Design, Front-End Development with engineer mindset.
Yurij M. has worked .
Soft Bee
Associated with
Soft Bee
$400K+
earned
Vasyl K.
$35/hr
100% Job Success
$60K+ earned
Available now
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🚀 𝗧𝗼𝗽 𝗥𝗮𝘁𝗲𝗱 𝗣𝗛𝗣 𝗟𝗮𝗿𝗮𝘃𝗲𝗹 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 · 𝟭𝟬𝟬% 𝗝𝗦𝗦 · 𝟭,𝟰𝟬𝟬+ 𝗵𝗿𝘀 · 𝟴 𝘆𝗿𝘀 𝗶𝗻 𝗽𝗿𝗼𝗱𝘂𝗰𝘁𝗶𝗼𝗻 Platforms I build don't require rewrites in 18 months. They handle real operational complexity from day one. Click "𝗛𝗶𝗿𝗲" 𝗼𝗿 "𝗜𝗻𝘃𝗶𝘁𝗲" to work with a PHP Laravel Developer who owns the architecture, not just the tickets. 📍 Lifetime warranty on every feature - I fix what breaks on my side. No questions asked. 📍 PHP Developer and Laravel Developer. 8 years of production-grade PHP Laravel and Symfony delivery. 📍 Full Stack Developer PHP and Full Stack Developer Laravel - E-Commerce, ERP, Logistics SaaS for clients in the US, UK, and EU. 🫵 𝗪𝗛𝗔𝗧 𝗬𝗢𝗨 𝗚𝗘𝗧 ✔️ As a PHP Developer and Laravel Developer - multi-role SaaS, complex permission layers, API integrations that hold up under production load. ✔️ As a Full Stack Developer PHP and Full Stack Developer Laravel - end-to-end from Database Architecture and Back-End Development to Vue.js frontends. 30–40% faster delivery than split-role teams. ✔️ As a PHP Laravel Developer for E-Commerce - order pipelines, inventory modules, payment integration, ERP logic. Clean enough that the next developer won't hate you. ✔️ As a Full Stack Developer Laravel for Logistics SaaS - last-mile tracking, KPI dashboards, API integration, fund management. 25–35% lower operational overhead post-launch. 🔥 𝗔𝗖𝗛𝗜𝗘𝗩𝗘𝗠𝗘𝗡𝗧𝗦 ✔️ 8 years · 1,400+ hours · Top Rated as a PHP Laravel Developer - E-Commerce, ERP, Logistics SaaS, FinTech across US, UK, and EU. ✔️ 100% satisfaction as a Full Stack Developer PHP - lifetime warranty on every codebase. ✔️ 15+ systems as a Full Stack Developer Laravel and Laravel Developer - multi-role access, order pipelines, integrations, dashboards built for operators. ✔️ 90% faster order processing · 80% lower manager workload via Full Stack Developer Laravel ERP and workflow automation as a PHP Laravel Developer. ✔️ 5–8 weeks faster time-to-launch through clean Software Architecture & Design and Full Stack Developer PHP ownership from day one. 🚚 𝗪𝗛𝗘𝗥𝗘 𝗜 𝗗𝗘𝗟𝗜𝗩𝗘𝗥 ✔️ As a PHP Laravel Developer and PHP Developer for SaaS - multi-role platforms, AI-powered scoring, automated reporting. 15+ products, 25–40% lower support load. ✔️ As a Full Stack Developer PHP - Back-End Development, API Integration, Vue.js, PostgreSQL backends for high data volumes. ✔️ As a Full Stack Ecommerce and flutter laravel-ready Laravel Shopify developer with php react frontends - supply chain, selling automation, filtration. 30–45% better conversion. ✔️ As a Full Stack Developer Laravel for Web Application development - payment systems, CRMs, logistics API integration. Every connection documented and maintainable. ✔️ As a PHP Developer and PHP Laravel Developer - 6–18 month engagements, php laravel react and laravel vue upgrades, Full-Stack Development that scales. 🏆 𝗜𝗡𝗗𝗨𝗦𝗧𝗥𝗬 𝗩𝗘𝗥𝗧𝗜𝗖𝗔𝗟𝗦 ✔️ E-Commerce & mobile app developer platforms - As a Full Stack Developer PHP and PHP Laravel Developer: order tracking, payment, full stack seo-ready architecture, recommendations. ✔️ Logistics - As a Full Stack Developer Laravel and PHP Laravel Developer: last-mile tracking, KPI dashboards, full stack laravel ecommerce + full stack developer shopify integrations. ✔️ ERP & Operations - As a Full Stack Developer Laravel and PHP Developer: inventory, order management. 40–70% less manual work through clean Database Architecture. ✔️ FinTech - As a PHP Laravel Developer and PHP Developer: bank statement processing, AI debtor scoring, audit-ready data flows. ✔️ AI-Powered SaaS - As a Full Stack Developer PHP: AI scoring into production Laravel platforms. ⚒️ 𝗛𝗢𝗪 𝗜 𝗕𝗨𝗜𝗟𝗗 ✔️ As a PHP Laravel Developer - Laravel, Symfony, Custom PHP, PHP Script, CodeIgniter with PHPUnit coverage and Software Architecture & Design from day one. ✔️ As a Full Stack Developer PHP, wordpress developer and web developer-aware engineer - Vue.js, JavaScript, HTML, HTML5, CSS, CSS3, Bootstrap, Tailwind CSS, jQuery, React, WordPress where it fits. ✔️ As a Full Stack Developer Laravel for data systems - PostgreSQL, MySQL, SQL, Database Architecture, Redis, Docker. PHP MySQL and php symfony stacks for scale, Software Debugging, and Web Design. ✔️ As a Web Application and Web Development expert - REST API, API Integration, Git, Angular, Node.js, python developer tools, react developer workflows, Back-End Development, Shopify, Desktop Application, Full-Stack Development, Software Development. 📊 𝗔𝗧 𝗔 𝗚𝗟𝗔𝗡𝗖𝗘 ✔️ Full Stack Developer PHP · Full Stack Developer Laravel · 1,000+ hrs · 100% JSS. ✔️ 15+ production platforms · 8 years · US, UK, EU · 30+ hrs/week. 🔹 Clean, documented code your next developer will thank you for. 🔹 Lifetime warranty - I fix what breaks on my side, no questions asked. Hire a PHP Developer and Full Stack Developer PHP who delivers. 👉 𝗖𝗹𝗶𝗰𝗸 𝗠𝗲𝘀𝘀𝗮𝗴𝗲 - 𝗹𝗲𝘁'𝘀 𝘁𝗮𝗹𝗸.
Vasyl K. has worked .
SIA "Snotor"
Associated with
SIA "Snotor"
$300K+
earned