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Oksana K.

Torrevieja, Spain

$35/hr
5.0
7 jobs

๐ŸšจAre you looking for a seasoned Full Stack Developer ๐ŸŒŸ who can transform your vision into a high-performance digital productโ“Look no furtherโ—๏ธWith over ๐Ÿต ๐˜†๐—ฒ๐—ฎ๐—ฟ๐˜€ ๐—ผ๐—ณ ๐—ต๐—ฎ๐—ป๐—ฑ๐˜€-๐—ผ๐—ป ๐—ฒ๐˜…๐—ฝ๐—ฒ๐—ฟ๐—ถ๐—ฒ๐—ป๐—ฐ๐—ฒ ๐Ÿ† I specialize in building robust ๐Ÿฆพ scalable ๐Ÿš€ and intuitive web applications using the latest technologies like ๐—ฅ๐—ฒ๐—ฎ๐—ฐ๐˜.๐—ท๐˜€, ๐—”๐—ป๐—ด๐˜‚๐—น๐—ฎ๐—ฟ, ๐—ฎ๐—ป๐—ฑ ๐—ก๐—ผ๐—ฑ๐—ฒ.๐—ท๐˜€ ๐Ÿ”ฅ๐Ÿ”ฅ๐Ÿ”ฅ โ›‘ ๐—ช๐—›๐—ฌ ๐—ช๐—ข๐—ฅ๐—ž ๐—ช๐—œ๐—ง๐—› ๐— ๐—˜? ๐Ÿš€ ๐—˜๐˜…๐—ฝ๐—ฒ๐—ฟ๐˜๐—ถ๐˜€๐—ฒ ๐—”๐—ฐ๐—ฟ๐—ผ๐˜€๐˜€ ๐˜๐—ต๐—ฒ ๐—ฆ๐˜๐—ฎ๐—ฐ๐—ธ: Whether it's front-end magic with ๐—ฅ๐—ฒ๐—ฎ๐—ฐ๐˜.๐—ท๐˜€/๐—”๐—ป๐—ด๐˜‚๐—น๐—ฎ๐—ฟ or back-end power with ๐—ก๐—ผ๐—ฑ๐—ฒ.๐—ท๐˜€, I've mastered the full stack. I ensure seamless integration, clean code, and efficient solutions that meet your business goals ๐Ÿ† ๐ŸŒŸ ๐—ง๐—ฎ๐—ถ๐—น๐—ผ๐—ฟ๐—ฒ๐—ฑ ๐—ฆ๐—ผ๐—น๐˜‚๐˜๐—ถ๐—ผ๐—ป๐˜€: I believe in a user-centric approach, tailoring every project to meet your unique needs. From dynamic single-page applications to complex enterprise systems, I deliver solutions that drive success ๐Ÿ‘‘ ๐Ÿ’ช ๐—”๐—ด๐—ถ๐—น๐—ฒ ๐—ฎ๐—ป๐—ฑ ๐—–๐—ผ๐—น๐—น๐—ฎ๐—ฏ๐—ผ๐—ฟ๐—ฎ๐˜๐—ถ๐˜ƒ๐—ฒ: I thrive in agile environments, working closely with clients to ensure their vision is realized at every stage. Transparent communication, iterative progress, and on-time delivery are my top priorities โฑ โ›‘ ๐—ฃ๐—ฒ๐—ฟ๐—ณ๐—ผ๐—ฟ๐—บ๐—ฎ๐—ป๐—ฐ๐—ฒ ๐—ฎ๐—ป๐—ฑ ๐—ฆ๐—ฐ๐—ฎ๐—น๐—ฎ๐—ฏ๐—ถ๐—น๐—ถ๐˜๐˜†: I build with the future in mind, ensuring your applications are not only fast and responsive but also scalable and maintainable. I'm committed to delivering quality that stands the test of time ๐Ÿ„โ€โ™€๏ธ ๐Ÿ†• ๐—–๐˜‚๐˜๐˜๐—ถ๐—ป๐—ด-๐—˜๐—ฑ๐—ด๐—ฒ ๐—ง๐—ฒ๐—ฐ๐—ต๐—ป๐—ผ๐—น๐—ผ๐—ด๐—ถ๐—ฒ๐˜€: Staying updated with the latest trends and technologies is key. I constantly refine my skills to leverage the best tools and practices in the industry, including TypeScript, Express, MongoDB, AWS, and more โšœ๏ธ ๐Ÿ† ๐— ๐˜† ๐—ž๐—ฒ๐˜† ๐—ฆ๐—ธ๐—ถ๐—น๐—น๐˜€ ๐—œ๐—ป๐—ฐ๐—น๐˜‚๐—ฑ๐—ฒ: ๐Ÿ† โœ… ๐—™๐—ฟ๐—ผ๐—ป๐˜-๐—˜๐—ป๐—ฑ: React.js, Angular, Redux, HTML5, CSS3, SASS, Bootstrap, Material UI โœ… ๐—•๐—ฎ๐—ฐ๐—ธ-๐—˜๐—ป๐—ฑ: Node.js, Express.js, RESTful APIs, GraphQL โœ… ๐——๐—ฎ๐˜๐—ฎ๐—ฏ๐—ฎ๐˜€๐—ฒ: MongoDB, MySQL, PostgreSQL โœ… ๐——๐—ฒ๐˜ƒ๐—ข๐—ฝ๐˜€: Docker, Kubernetes, CI/CD Pipelines, AWS, Azure โœ… ๐—ง๐—ฒ๐˜€๐˜๐—ถ๐—ป๐—ด: Jest, Mocha, Chai, Cypress ๐Ÿ’ซ ๐•Ž๐•™๐•’๐•ฅ ๐•„๐•ช โ„‚๐•๐•š๐•–๐•Ÿ๐•ฅ๐•ค ๐•Š๐•’๐•ช: ๐Ÿ’ซ ๐Ÿ’ฌ "๐˜ˆ๐˜ฏ ๐˜ฆ๐˜น๐˜ค๐˜ฆ๐˜ฑ๐˜ต๐˜ช๐˜ฐ๐˜ฏ๐˜ข๐˜ญ ๐˜ฅ๐˜ฆ๐˜ท๐˜ฆ๐˜ญ๐˜ฐ๐˜ฑ๐˜ฆ๐˜ณ ๐˜ธ๐˜ฉ๐˜ฐ ๐˜ค๐˜ฐ๐˜ฏ๐˜ด๐˜ช๐˜ด๐˜ต๐˜ฆ๐˜ฏ๐˜ต๐˜ญ๐˜บ ๐˜ฅ๐˜ฆ๐˜ญ๐˜ช๐˜ท๐˜ฆ๐˜ณ๐˜ด ๐˜ฉ๐˜ช๐˜จ๐˜ฉ-๐˜ฒ๐˜ถ๐˜ข๐˜ญ๐˜ช๐˜ต๐˜บ ๐˜ธ๐˜ฐ๐˜ณ๐˜ฌ. ๐˜๐˜ช๐˜ด ๐˜ข๐˜ฃ๐˜ช๐˜ญ๐˜ช๐˜ต๐˜บ ๐˜ต๐˜ฐ ๐˜ฉ๐˜ข๐˜ฏ๐˜ฅ๐˜ญ๐˜ฆ ๐˜ค๐˜ฐ๐˜ฎ๐˜ฑ๐˜ญ๐˜ฆ๐˜น ๐˜ต๐˜ข๐˜ด๐˜ฌ๐˜ด ๐˜ธ๐˜ช๐˜ต๐˜ฉ ๐˜ฆ๐˜ข๐˜ด๐˜ฆ ๐˜ช๐˜ด ๐˜ช๐˜ฎ๐˜ฑ๐˜ณ๐˜ฆ๐˜ด๐˜ด๐˜ช๐˜ท๐˜ฆ." ๐Ÿ’ฌ "๐˜Œ๐˜ง๐˜ง๐˜ช๐˜ค๐˜ช๐˜ฆ๐˜ฏ๐˜ต, ๐˜ณ๐˜ฆ๐˜ญ๐˜ช๐˜ข๐˜ฃ๐˜ญ๐˜ฆ, ๐˜ข๐˜ฏ๐˜ฅ ๐˜ข ๐˜ต๐˜ณ๐˜ถ๐˜ฆ ๐˜ฆ๐˜น๐˜ฑ๐˜ฆ๐˜ณ๐˜ต ๐˜ช๐˜ฏ ๐˜ง๐˜ถ๐˜ญ๐˜ญ-๐˜ด๐˜ต๐˜ข๐˜ค๐˜ฌ ๐˜ฅ๐˜ฆ๐˜ท๐˜ฆ๐˜ญ๐˜ฐ๐˜ฑ๐˜ฎ๐˜ฆ๐˜ฏ๐˜ต. ๐˜›๐˜ฉ๐˜ฆ ๐˜ฑ๐˜ณ๐˜ฐ๐˜ซ๐˜ฆ๐˜ค๐˜ต ๐˜ฆ๐˜น๐˜ค๐˜ฆ๐˜ฆ๐˜ฅ๐˜ฆ๐˜ฅ ๐˜ฐ๐˜ถ๐˜ณ ๐˜ฆ๐˜น๐˜ฑ๐˜ฆ๐˜ค๐˜ต๐˜ข๐˜ต๐˜ช๐˜ฐ๐˜ฏ๐˜ด." ๐Ÿš€ ๐—ฅ๐—ฒ๐—ฎ๐—ฑ๐˜† ๐˜๐—ผ ๐—•๐—ฟ๐—ถ๐—ป๐—ด ๐—ฌ๐—ผ๐˜‚๐—ฟ ๐—ฃ๐—ฟ๐—ผ๐—ท๐—ฒ๐—ฐ๐˜ ๐˜๐—ผ ๐—Ÿ๐—ถ๐—ณ๐—ฒ? ๐Ÿš€ Letโ€™s collaborate to build something extraordinary! Whether you need a new web application, a feature upgrade, or technical consultation, I'm here to help. Drop me a message, and let's discuss how we can achieve your goals together ๐Ÿš€๐Ÿš€๐Ÿš€ KEYWORDS: Full-stack development | fullstack developer | web development | React.js | Angular | Node.js | JavaScript | HTML5 | CSS3 | TypeScript | front-end development | frontend developer | back-end development | backend developer | MongoDB | MySQL | PostgreSQL | Express.js | RESTful APIs | GraphQL | Bootstrap | Material UI | SASS | LESS | Redux | Docker | Kubernetes | CI/CD pipelines | AWS | Azure | Firebase | Git | GitHub | Bitbucket | DevOps | Agile development | Scrum | responsive design | single-page applications | SPAs | web apps | cross-browser compatibility | performance optimization | web security | authentication | authorization | JWT | OAuth | JSON | AJAX | WebSockets | API integration | microservices | serverless architecture | cloud computing | MVC architecture | database design | NoSQL | SQL | data modeling | TDD | unit testing | integration testing | Jest | Mocha | Chai | Cypress | Selenium | continuous integration | continuous deployment | code review | code quality | design patterns | MVC | MVVM | version control | object-oriented programming | OOP | functional programming | ES6+ | npm | yarn | package management | web components | PWA | progressive web apps | mobile-first design | UI/UX design | wireframing | prototyping | REST architecture | SOAP | XML | Redux-Saga | Next.js | Nuxt.js | Angular CLI | React Router | server-side rendering | SSR | client-side rendering | CSR | SEO optimization | Webpack | Babel | Gulp | Grunt | software architecture | system design | debugging | troubleshooting | web accessibility | ADA compliance | node js developer | react js node js | node js angular | mongodb node js | backend nodejs | backend nodejs | nodejs developer | react nodejs | nodejs mongodb | typescript nodejs | node.js developer | react.js node.js | backend node.js | node.js aws | vue.js node.js | backend nodejs | react | react developer | react native | react native mobile | react typescript | beta reader | reactjs | reactjs redux | reactjs developer | reactjs typescript | react.js | react.js node.js | react.js developer

  • Node.js
  • JavaScript
  • Web Application
  • PHP
  • TypeScript
  • API
  • API Integration
  • Python
  • MySQL
  • Web Development
  • React
  • HTML
  • Web Design
  • CSS
  • HTML5
Anton C.

Barcelona, Spain

$35/hr
4.9
78 jobs

โญ๏ธ ๐—ฆ๐—ฝ๐—ฒ๐—ฒ๐—ฑ ๐˜„๐—ถ๐˜๐—ต๐—ผ๐˜‚๐˜ ๐—ฐ๐˜‚๐˜๐˜๐—ถ๐—ป๐—ด ๐—ฐ๐—ผ๐—ฟ๐—ป๐—ฒ๐—ฟ๐˜€: working code on time, every time โญ๏ธ ๐—•๐˜‚๐—ฑ๐—ด๐—ฒ๐˜ ๐—ฑ๐—ถ๐˜€๐—ฐ๐—ถ๐—ฝ๐—น๐—ถ๐—ป๐—ฒ: every billed hour is justified โ€” no filler tasks โญ๏ธ ๐—•๐˜‚๐˜€๐—ถ๐—ป๐—ฒ๐˜€๐˜€-๐—ณ๐—ถ๐—ฟ๐˜€๐˜ ๐˜๐—ต๐—ถ๐—ป๐—ธ๐—ถ๐—ป๐—ด: I understand the problem before I write code, so your budget goes into the product, not experiments ๐Ÿš€ React Developer, Full Stack Developer React, Frontend React Developer โ€” specializing in production-ready SaaS platforms, multi-tenant B2B systems, and AI-powered web applications. โญ Top Rated Plus โ€ข 6+ years as a React Developer โ€ข 70+ projects delivered as a Full Stack Developer React Next.js โ€ข 5,000+ Upwork hours as a React Native Developer โ€ข ~70% returning clients as a Frontend React Developer WHY HIRE ME ๐Ÿ“… 6+ years and ๐Ÿ“ฆ 70+ projects mark my work as a Full Stack Developer React Node, building SaaS Platform, MVP, and AI-Powered Web Application solutions. ๐Ÿ” ~70% of clients return โ€” a track record built as a React Developer through partnerships lasting months to years, working as a Frontend React Developer and Full Stack React Developer. โฑ๏ธ 5,000+ Upwork hours logged as a React.js Developer, Node.js Developer, and React Native Developer. โญ Top Rated Plus status reflects steady delivery as a Front End Developer and Nextjs Developer, with a track record of on-time launches. WHERE I DELIVER Working as a Full Stack Developer React Node, I built a multi-tenant B2B SaaS platform with React, Next.js, and Node.js โ€” OWASP-compliant authentication, role-based access control, custom workflow logic, and full Stripe billing (Subscriptions and Connect), backed by PostgreSQL via Prisma with REST and GraphQL APIs on AWS. Building as a React Developer with the OpenAI and Anthropic APIs, I developed an AI-powered SaaS product with React, Next.js, Node.js, and Supabase โ€” RAG pipelines, embeddings, semantic search, real-time streaming, Stripe Checkout billing, and an offline-ready PWA on Vercel. My work as a Frontend React Developer covers two-sided marketplaces, e-commerce platforms, booking and scheduling systems, real-time chat, analytics dashboards, and internal tools. Complex features like authentication flows, payment processing, real-time data, and third-party integrations fall under my Front End Developer work. Deep App Router, Server Components, SSR, SSG, and ISR experience comes from my time as a React Next.js Developer and Node.js Developer, plus API routes and middleware. Core Web Vitals, accessibility, and responsive, cross-browser interfaces are where my Full Stack React Developer background shows. The same product extends to iOS and Android through my React Native Developer work with React Native and Expo. Production-ready code from MVP to scale is what I deliver as a Web App Developer React and React App Developer. REST and GraphQL APIs, authentication flows, and background jobs for high-traffic products come out of my Node js Developer and Full Stack Developer React Node experience. SEO-friendly, fast-loading storefronts and marketing sites come from my React Web Developer and Nextjs Developer work. TECH STACK On the frontend, I build with React, Next.js, and TypeScript, styling with Tailwind CSS and Shadcn/ui and handling state with Redux or Zustand โ€” whatever keeps the codebase easy to hand off. The backend runs on Node.js, usually via Express or NestJS, talking to PostgreSQL through Prisma, or to Supabase and Firebase when a project needs managed auth and real-time out of the box, exposed through REST or GraphQL APIs. I deploy to AWS or Vercel with GitHub Actions running CI/CD, so every push ships cleanly. When a project calls for OAuth, webhooks, transactional email via SendGrid, or automation through Zapier, that comes built into the stack, not bolted on later. MIXED-STACK SUPPORT Python, PHP, Laravel, MySQL, MongoDB, Redis, WordPress, Java, FastAPI, jQuery, and Web3 round out a broader Python Developer, Wordpress Developer, and React Web Developer skill set โ€” and as a Mobile App Developer, I pick up inherited code and mixed stacks quickly. INDUSTRIES SaaS & B2B, AI Startups, Marketplaces & E-commerce, Fintech, Healthtech, Ed-tech, and Real estate โ€” where my React Developer and Full Stack Developer React Node work has landed. WHAT CLIENTS HIRE ME FOR Scalable web applications, secure REST and GraphQL APIs, high-performance Next.js front-ends, and reliable, production-ready SaaS โ€” that's what clients bring me on for as a React Developer, Full Stack Developer React Node, and Frontend React Developer, backed by ๐Ÿ“ฆ 70+ projects, ๐Ÿ“… 6+ years, and ๐Ÿ” ~70% returning clients. Building, scaling, or improving a product? I work as a React Developer, Full Stack Developer React Node, Frontend React Developer, React Native Developer, and Nextjs Developer โ€” let's talk on a quick call. ๐Ÿ‘‡

  • Node.js
  • JavaScript
  • jQuery
  • MongoDB
  • React
  • CSS
  • Front-End Development
  • TypeScript
  • Bootstrap
  • HTML
  • PHP
  • React Native
  • Vue.js
  • Web Design
  • Responsive Design
  • Redux
  • CSS 3
  • Python
  • WordPress
  • HTML5
Maria S.

Roses, Spain

$75/hr
5.0
2 jobs

I build SaaS products that work well and look great, and I've been doing it for 6 years. I build complete products โ€” backend, frontend, and everything in between โ€” for medium-sized businesses that need software that works reliably and looks professional. SaaS platforms, subscription billing, role-based systems, real-time features, clean dashboards. I combine technical execution with design sensibility: the apps I build don't just function well, they feel right to use. End-to-end ownership, tight deadlines, quality results. Let's build something.

  • Node.js
  • ExpressJS
  • JavaScript
  • Web Application
  • Angular
  • HTML
  • CSS
  • SCSS
  • C#
  • Java
  • Bootstrap
  • Web Development
  • Responsive Design
  • Stripe
  • Supabase
  • NestJS
Mariya S.

Platja d'Aro, Spain

$35/hr
4.6
220 jobs

$1M+ earned on Upwork. 25+ years, 700+ projects, and deep JavaScript/TypeScript expertise across React, Next.js, Node.js & NestJS. I build and scale SaaS, web apps, automation, APIs, and complex platforms from architecture to production. ๐Ÿ‘‹ Iโ€™m a veteran Senior Full-Stack JavaScript/TypeScript Engineer, Full Stack JavaScript Developer, React Developer, Node.js Developer, and Web Developer with 25+ years of experience building scalable web applications, SaaS platforms, automation systems, browser extensions, and enterprise-grade JavaScript products. I work across the full product lifecycle - from architecture and UI development to backend APIs, cloud infrastructure, integrations, performance optimization, and production support. My core stack includes React, React.js, Next.js, Node.js, NestJS, TypeScript, Vue.js, Angular, PostgreSQL, MongoDB, Redis, AWS, Docker, and serverless technologies. Over the years, Iโ€™ve delivered 700+ projects across SaaS, eCommerce, Fintech, Web-to-Print, EdTech, Healthcare, CRM, AI automation, marketplaces, analytics, and enterprise platforms. ๐Ÿ† RESULTS & EXPERIENCE โœ” 25+ years in full stack development and web engineering โœ” 700+ web, SaaS, React, Node.js, and automation projects delivered โœ” Systems handling 10M+ API requests per month โœ” 30+ applications scoring 90โ€“100 in Lighthouse audits โœ” Backend performance improvements of up to 50% โœ” Production experience with startups, scaling products, and enterprise systems โœ” Advanced AWS serverless, event-driven, and real-time architecture โœ” CI/CD and monorepo workflows that accelerate delivery and simplify maintenance โšก FRONTEND / REACT DEVELOPMENT As a Senior React Developer and Frontend Developer, I build fast, maintainable interfaces for SaaS platforms, dashboards, marketplaces, internal tools, and customer-facing applications. My frontend expertise includes: โ€ข React 18, React.js, Next.js 14+, Vue.js, Angular, TypeScript โ€ข SPA, SSR, ISR, PWA, and responsive web application development โ€ข Tailwind CSS, Material UI, SCSS, Bootstrap, and reusable UI systems โ€ข Complex dashboards, analytics interfaces, charts, and data visualization โ€ข Storybook, design systems, reusable component libraries, and UI architecture โ€ข Nx, Turborepo, Module Federation, and micro frontend architecture โ€ข Core Web Vitals, Lighthouse optimization, bundle reduction, and frontend performance โ€ข Mobile-first development and React Native integrations โ€ข Chrome extensions, browser extensions, content scripts, background services, and extension APIs โ€ข Puppeteer, Playwright, browser automation, scraping workflows, and automated testing ๐Ÿ”Œ NODE.JS / BACKEND DEVELOPMENT As a Node.js Developer and Backend Developer, I design scalable APIs and backend systems that support complex business logic, real-time workflows, automation, and high-volume applications. โ€ข Node.js, NestJS, Express, Koa, Hapi โ€ข REST API and GraphQL development โ€ข PostgreSQL, MongoDB, MySQL, DynamoDB, Firebase, Redis โ€ข Prisma, Sequelize, TypeORM, Mongoose โ€ข JWT, OAuth, RBAC, secure authentication, and permissions โ€ข WebSockets, SocketIO, Redis, Kafka, and real-time infrastructure โ€ข BullMQ, AWS SQS, queues, workers, and background processing โ€ข Microservices and event-driven architecture โ€ข AWS Lambda, EventBridge, Step Functions, and serverless systems โ€ข ETL pipelines, analytics processing, and data aggregation โ€ข OpenAI API, Dialogflow, AI integrations, and automation workflows โ˜๏ธ CLOUD, DEVOPS & DELIVERY I build production-ready systems with reliable deployment, monitoring, and scaling workflows. โ€ข AWS, Docker, CloudFront, S3, Vercel, Firebase โ€ข GitHub Actions, GitLab CI/CD, Bitbucket Pipelines โ€ข AWS CDK and infrastructure as code โ€ข Sentry, Datadog, ELK Stack, logging, and monitoring โ€ข Redis caching, database optimization, and cloud cost reduction โ€ข Monorepos with Nx and Turborepo โ€ข Secure deployment and environment management ๐ŸŒ PRODUCTS I BUILD โ€ข SaaS platforms and startup MVPs โ€ข AI-powered products and automation systems โ€ข eCommerce and marketplace platforms โ€ข CRM, ERP, and internal business tools โ€ข Fintech and analytics applications โ€ข Healthcare and EdTech platforms โ€ข Real-time dashboards and reporting systems โ€ข Browser extensions and browser automation tools โ€ข API integrations and workflow automation โ€ข Legacy platform modernization โš™๏ธ CORE TECHNOLOGIES JavaScript, TypeScript, React, React.js, Next.js, Vue.js, Angular, Node.js, NestJS, Express, PostgreSQL, MongoDB, MySQL, Redis, AWS, Docker, Firebase, Vercel, GraphQL, WebSockets, Puppeteer, Playwright, Stripe, OpenAI API, SendGrid, PandaDoc. โœ… LETโ€™S BUILD A PRODUCT THAT CAN SCALE Message me If you need a Senior Full Stack Developer, Full Stack JavaScript Developer, React Developer, Next.js Developer, Node.js Developer, Backend Developer, or Web Developer who can take ownership of both architecture and delivery, Iโ€™d be glad to help.

  • Node.js
  • ExpressJS
  • JavaScript
  • MongoDB
  • Web Application
  • React
  • TypeScript
  • CSS
  • GraphQL
  • Front-End Development
  • Full-Stack Development
  • Redux
  • Next.js
  • React Native
  • PostgreSQL
  • REST API
  • API Integration
  • Python
  • HTML5
  • Vue.js
Viacheslav D.

EL CAMPELLO, ALICANTE/ALACANT, Spain

$50/hr
4.9
167 jobs

Hello! Iโ€™m a Senior Full-Stack & AI Solutions Architect with 20+ years of experience in building high-impact digital products for startups, enterprises, and fast-growing SaaS companies. As the CEO of Anadea, a European software development company with 100+ engineers, I personally lead AI transformation projects and help teams ship clean, scalable, and business-driven solutions - fast and efficiently. ๐Ÿš€ What I do best I help companies turn complex ideas into working, profitable software. Over the years I've led and delivered projects in: AI-powered SaaS platforms Custom CRMs, ERPs, enterprise-grade systems Real estate platforms & marketplaces E-learning & digital training systems E-commerce, booking platforms & multi-tenant solutions MVPs built from scratch with rapid iteration cycles My role blends deep technical expertise, system thinking, and strategic product guidance - ensuring every feature solves a real business problem. ๐Ÿ”ฅ AI Development & Automation Expertise I specialize in designing and integrating AI across existing and new products: ๐Ÿ”ธ Custom AI chatbots & assistants (RAG, LangChain, multi-step reasoning) ๐Ÿ”ธ Semantic search, document processing, voice interfaces ๐Ÿ”ธ AI-driven workflows for customer support, onboarding, analytics ๐Ÿ”ธ Intelligent automation & process optimization for SaaS workflows ๐Ÿ”ธ AI-augmented full-stack apps (React/Next + Node/Nest + Python) I oversee AI solutions from architecture โ†’ prototyping โ†’ production, ensuring reliability, cost-efficiency, and high-quality results. ๐Ÿ’ก AI Tools & Modern Engineering Stack Actively working with: โœ”๏ธ Botpress, Bolt.new, Lovable, Cursor โœ”๏ธ Deepgram, ElevenLabs, Whisper โœ”๏ธ LangChain, RAG pipelines, vector databases โœ”๏ธ AWS / GCP / Vercel / Supabase deployments โœ”๏ธ React, Next.js, Vue, Node.js, NestJS, Python, FastAPI โœ”๏ธ PostgreSQL, Redis, MongoDB, cloud-native architectures ๐Ÿง  Engineering Leadership & Product Delivery With my team, we provide end-to-end development: Business analysis & product strategy UI/UX (research โ†’ wireframes โ†’ high-end design) Full-stack development AI integration QA & automation Long-term support & scaling Weโ€™ve delivered 300+ digital products across 40+ industries, including fintech, real estate, logistics, education, healthcare, and enterprise systems. ๐Ÿ† Track Record โœ”๏ธ 15+ years in full-cycle software engineering โœ”๏ธ 100+ engineers in the team (AI, web, mobile, QA, DevOps) โœ”๏ธ 250+ completed web & mobile projects โœ”๏ธ Trusted by global clients in the US, EU, UK, UAE, Canada โœ”๏ธ Featured in Clutch as a top-rated software development company โœ”๏ธ Expertise in SaaS, CRM, ERP, AI agents, marketplaces & large platforms ๐ŸŽฏ What clients appreciate Clear communication Fast execution & strategic thinking Reliable delivery with predictable timelines Practical, not overcomplicated solutions Focus on business value, not just code ๐Ÿค– AI Development & Automation ๐Ÿ”น Custom AI Chatbots ยท GPT-based Agents ยท Autonomous Agents ๐Ÿ”น RAG ยท LangChain ยท Vector Databases (Pinecone, Weaviate) ๐Ÿ”น AI Assistants ยท Multi-step Prompt Chains ยท LLM Orchestration ๐Ÿ”น Document Understanding ยท OCR ยท NLP Pipelines ยท Semantic Search ๐Ÿ”น Speech AI ยท Voice Interfaces (Whisper, Deepgram, ElevenLabs) ๐Ÿ”น Predictive Analytics ยท Forecasting Models ยท Recommendation Engines ๐Ÿ”น Workflow Automation ยท AI Process Optimization ๐Ÿ”น AI for SaaS ยท AI for E-commerce ยท AI for Real Estate ๐Ÿ”น AI UX ยท AI-first Systems ยท Hybrid AI Apps (React/Node/Python) ๐Ÿ”น OpenAI ยท Anthropic ยท Llama ยท Cloud AI Services (AWS/GCP) ๐Ÿ”ฅ Keywords for Upwork Search AI Developer โ€ข AI Engineer โ€ข Full Stack Developer โ€ข SaaS Developer โ€ข GPT Developer โ€ข RAG Expert โ€ข AI Chatbot โ€ข AI Agent โ€ข LLM Engineer โ€ข Workflow Automation โ€ข React Developer โ€ข Node.js Developer โ€ข Python Developer โ€ข SaaS Architect โ€ข CTO-as-a-Service โ€ข Startup MVP โ€ข AI SaaS Platform โ€ข Machine Learning โ€ข Product Development โ€ข AI Consultant If youโ€™re looking for a senior expert who can design, architect, and deliver AI-powered platforms from idea to production, letโ€™s talk.

  • Node.js
  • JavaScript
  • API
  • Full-Stack Development
  • React
  • AI Development
  • Machine Learning
  • AI Platform
  • AI Chatbot
  • Python
  • Retrieval Augmented Generation
  • Amazon Web Services
  • Docker
  • DevOps
  • PostgreSQL
  • Supabase
  • LangChain
  • AI Agent Development
  • Generative AI
  • n8n
Aleksandra L.

Alicante, Spain

$47/hr
4.9
169 jobs

I am Aleksandra, leading a team of experienced full-stack developers specializing in AI-driven applications. We design and develop modern, scalable web and mobile solutions that integrate artificial intelligence, automation, and cloud technologies to optimize business operations. With over 20+ years of collective experience, we have worked with startups and enterprises across industries like FinTech, Healthcare, eCommerce, and SaaS. Our expertise spans the entire development cycle, from initial concept and UI/UX design to backend architecture, AI integration, SRE (Site Reliability Engineering), and cloud deployment. ๐Ÿ† 194+ successful projects completed on Upwork with global clients ๐Ÿ’ฒ $5M+ earned on Upwork through high-impact full-stack and AI solutions โฑ 55,121+ hours billed, proving long-term client trust and engagement ๐Ÿ’ผ 600+ total projects delivered since 2000 across AI, web, and mobile ๐Ÿ“š 100% of developers hold engineering degrees, ensuring expert-level technical depth ๐Ÿ‘ฉโ€๐Ÿ’ป Advanced AI team includes Kaggle competition masters and top ML researchers ๐Ÿ“Š 91%+ job success rate, reflecting top-tier performance and consistency ๐Ÿš€ 25+ AI-driven apps deployed in FinTech, EdTech, and HealthTech ๐Ÿง  30+ machine learning models built and optimized for live environments ๐ŸŒŽ 20+ industries served, from startups to Fortune 500 clients ๐Ÿงฑ Founded in 2000, bringing 24+ years of experience in software innovation ๐Ÿ›  40+ React + Python full-stack solutions developed for scalable applications โšก High-load systems deployed to serve thousands of concurrent users ๐Ÿ“ˆ Client ROI increased by up to 70% in AI automation projects ๐Ÿ’ฌ Featured in Forbes, MBN Magazine, and Helsinki Times for client success stories Expertise: Full-stack development for web and mobile applications AI-powered solutions, including computer vision, natural language processing, and predictive analytics Scalable cloud architecture using AWS, Google Cloud, and Azure Real-time data processing and AI-driven automation Platform Engineering and Infrastructure as Code (IaC) GitOps workflows and CI/CD pipeline optimization API development and third-party service integrations Performance optimisation for high-traffic applications FinOps and cloud cost optimisation Secure and accessible web applications with SEO best practices Technology Stack: Frontend: React.js, Next.js, Vue.js, TypeScript Backend: Node.js, Python (FastAPI, Django, Flask), Golang AI & Machine Learning: TensorFlow, PyTorch, OpenAI API, Hugging Face, LLMOps Databases: PostgreSQL, MongoDB, Redis, Firebase Cloud & DevOps: AWS (Lambda, S3, DynamoDB, EC2), Docker, Kubernetes, Terraform, Helm, ArgoCD, GitHub Actions, GitLab CI/CD, Ansible, Prometheus, Grafana, ELK Stack Tools & Platforms: Figma for UI/UX, Miro for user flow mapping, Webflow for no-code development Why Work With Us? We focus on delivering intelligent, future-proof applications that drive business growth. Our team ensures seamless collaboration, clean code, and scalable architecture that adapts to evolving needs. We are committed to clear communication, efficient execution, and long-term support. If you are looking for a team that can build and scale AI-powered applications with a strong full-stack foundation, let's discuss your project. ๐Ÿ”‘ Keywords to find me: AI Developer | Full-Stack Developer | AI Applications | React Developer | Node.js Developer | Python Developer | AI Integration | SaaS Developer | Web App Developer | Mobile App Developer | Scalable Applications | AI-Powered Software | Computer Vision | NLP Engineer | Machine Learning Engineer | Backend Developer | Frontend Developer | Cloud Developer | Automation Engineer | Cloud Architect | GCP | AWS | Azure | TensorFlow | PyTorch | OpenAI | Hugging Face | FastAPI | Django Developer | Flask Developer | Golang Developer | MLOps | LLMOps | DevOps | SRE | Site Reliability Engineer | Platform Engineer | Kubernetes | Docker | Helm | ArgoCD | Terraform | Infrastructure as Code | IaC | GitOps | CI/CD | GitHub Actions | GitLab CI/CD | Jenkins | Ansible | Prometheus | Grafana | Datadog | ELK Stack | DevSecOps | FinOps | AIOps | Observability | Monitoring | Service Mesh | Istio | Crossplane | OpenTelemetry | HashiCorp Vault | Multi-Cloud | Serverless | Figma | Webflow | Miro | Firebase Developer | MongoDB Developer | PostgreSQL | Redis | REST API Developer | API Integration | Predictive Analytics | AI in FinTech | AI in Healthcare | AI in eCommerce | SaaS Application | Intelligent Automation | Real-Time Data Processing | Cross-Platform Developer | SEO-Friendly Development | Secure Web Applications | Scalable Web Architecture | UI/UX Focused Developer | AI SaaS Developer | AI-Powered Mobile Apps | Full-Cycle Development | AI Solutions for Business | Enterprise Software | Startup MVP Development | AI Team Lead | Cloud-Native Applications | Serverless Architecture | AI-Driven Optimization | AI Workflow Automation | Real-Time AI Solutions | AI-Enhanced UX | AI Web App | AI-Powered Dash

  • Node.js
  • Python
  • Machine Learning
  • Generative AI
  • AI Agent Development
  • Machine Learning Model
  • Full-Stack Development
  • React
  • Computer Vision
  • Mobile App Development
  • MLOps
  • DevOps
  • Docker
  • Kubernetes
  • Amazon Web Services
  • FastAPI
  • TensorFlow
  • Cloud Architecture
  • Natural Language Processing
  • Large Language Model

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