Hire the Best Web Services Specialists
in Portugal

✅ 17 completed projects ✅ 1,384+ hours delivered ✅ 5.0 rating on Fullstack and AI work Over the past 7 years, I have combined backend engineering, automation, and applied AI to help businesses operate more efficiently. 𝗛𝗶𝗿𝗲 𝗠𝗲 𝗙𝗼𝗿 ✧ Fullstack web and MVP development (React, Next.js, Node.js, Python) ✧ AI integration and chatbot development (OpenAI, LangChain, Claude, RAG) ✧ Workflow and business process automation ✧ E-commerce AI integrations ✧ Backend and API architecture (FastAPI, Django, microservices) ✧ Predictive models and data-driven decision tools ✧ Legacy application modernization using AI 𝗘𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲 Python ▸ Node.js ▸ NestJs ▸ Django ▸ Next.js ▸ React ▸ JavaScript ▸ AWS ▸ Git ▸ TensorFlow ▸ PyTorch ▸ OpenAI API ▸ LangChain ▸ Claude 3.5 Sonnet ▸ Retrieval-Augmented Generation ▸ Automation ▸ LLM Ops ▸ Prompt Engineering ▸ Kubernetes ▸ Docker 𝗪𝗵𝘆 𝗧𝗲𝗮𝗺𝘀 𝗮𝗻𝗱 𝗖𝗹𝗶𝗲𝗻𝘁𝘀 𝗪𝗼𝗿𝗸 𝗪𝗶𝘁𝗵 𝗠𝗲 ▹ I own delivery end-to-end. ▹ I can automate repetitive work so teams can focus on what actually drives growth.

Hi! I am a versatile Software Developer and Data Specialist with a strong background in Computer Engineering. I specialize in bridging the gap between robust web development and intelligent data ecosystems. Whether you need a dynamic web application built from scratch, a messy database thoroughly cleaned, a software suite rigorously tested, or data pipelines prepped for AI models—I’ve got you covered. What I do best: - Web & SaaS Development: Designing clean, efficient web and mobile solutions using modern frameworks (Blazor, Django, React Native, Flutter, ASP.NET MVC, Node.js). - Data Analytics & Cleaning: Processing raw datasets, automating ETL pipelines (Kettle), managing relational databases (PostgreSQL), and building advanced Power BI dashboards. - QA Testing & System Validation: Creating simulated web environments to test data ingestion, catch edge cases, and ensure overall software quality. - AI Evaluation & Prompt Analysis: Reviewing, auditing, and optimizing dataset quality and AI prompt alignment for high-standard machine learning training. I am highly detail-oriented, analytical, and focused on delivering scalable, bug-free results that bring commercial value to your business. Let's discuss how I can help solve your technical challenges. Ready to get started!

💼 8+ years of Full Stack Development experience with strong expertise in Software Architecture 🌍 120+ projects delivered for clients in the US, Canada, Europe & the Middle East 💰 20M+ in client revenue generated through high-performance web apps 🚀 40+ SaaS platforms & 12 HR solutions successfully launched 📱 Dozens of responsive Progressive Web Apps (PWA) delivered ⭐ 5-Star ratings across all projects I lead a team building scalable web, mobile, and SaaS products for startups and growing businesses. With React, React Native, and Node.js developers alongside UI/UX and Product Designers, we own the full product lifecycle - from MVP to stable production - delivering full-stack solutions built for long-term velocity and measurable business outcomes 🚀 𝗠𝗩𝗣 & 𝗦𝘁𝗮𝗿𝘁𝘂𝗽 𝗣𝗿𝗼𝗱𝘂𝗰𝘁 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 We help founders move fast without sacrificing quality through agile full-stack development, mobile development, and React Native Developer workflows. Every MVP starts with a UX Designer and Product Designer working through user flows, wireframing, and prototyping in Figma before a single line of code is written. Our focus is on: 🎯 Turning ideas into working MVPs, building investor-ready demos, and launching beta products quickly 𝗢𝘂𝗿 𝘁𝗲𝗮𝗺 𝗱𝗲𝗹𝗶𝘃𝗲𝗿𝘀: ✅ Rapid MVP development (User Interface Design – Frontend – Backend) ✅ UX flows, wireframing, and prototyping by our Figma Designer team ✅ Production-ready code with React, Next.js, TypeScript, React Native, and Swift ✅ Secure third-party integrations (Stripe, Firebase, Auth0, Twilio, Google Maps) ✅ Clean, scalable architecture designed for long-term growth and SaaS solutions As a Full Stack Developer SaaS team, we've helped startups raise funding and scale from MVP to 100,000+ users - and as a React Native Developer partner, we ensure your mobile product ships with the same precision as your web platform 💻 𝗪𝗲𝗯 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 Our React Frontend Developers, React Developers specializing in Next.js, and Node Developers work together to build fast, scalable web applications across the full stack - optimizing Core Web Vitals to achieve 95+ Lighthouse scores and 35% bundle reductions on Next.js TypeScript projects, because performance is never an afterthought. 🔹 Front-End: React.js, Next.js, TypeScript, JavaScript (ES6+), HTML5, CSS3, Tailwind CSS 🔹 Back-End: Node.js, NestJS, Express.js (REST & GraphQL), PostgreSQL, MongoDB, MySQL 🔹 CMS & Headless: Sanity, Contentful, Strapi This collaboration between React Frontend Developers and Node Developers ensures clean, scalable code - a foundation especially critical for SaaS platforms and enterprise B2B products 📱 𝗠𝗼𝗯𝗶𝗹𝗲 𝗔𝗽𝗽 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 Our React Native Developers build mobile applications optimized for real-world usage, starting with UX mapping and UI design before development begins. As a Full Stack Developer, React Node team, we handle everything from UI to server-side logic: 🔹 React Native Developer Expo workflow for fast cross-platform delivery 🔹 Swift & SwiftUI for native iOS apps 🔹 Firebase, push notifications, analytics 🔹 App Store deployment and optimization 🔹 Offline mode, multi-language support, battery efficiency Our approach enables rapid iteration and production-ready releases, with Node.js powering smooth mobile-backend communication ☁️ 𝗖𝗹𝗼𝘂𝗱, 𝗗𝗲𝘃𝗢𝗽𝘀 & 𝗦𝘆𝘀𝘁𝗲𝗺 𝗔𝗿𝗰𝗵𝗶𝘁𝗲𝗰𝘁𝘂𝗿𝗲 Our Full Stack Developer React Node team designs and maintains reliable, production-ready infrastructure: 🔹 AWS: Lambda, EC2, S3, CloudFront, RDS, Docker, Kubernetes, Terraform 🔹 CI/CD pipelines (GitHub Actions, GitLab CI) 🔹 Monitoring & logging (Sentry, Prometheus, Grafana) The goal: stable deployments, predictable scaling, and minimal downtime - essential for any serious Full Stack Developer SaaS platform handling real user load 🎨 𝗨𝗜/𝗨𝗫 𝗗𝗲𝘀𝗶𝗴𝗻 & 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 Our UI/UX Designers and Product Designers approach design as a core part of the product, not a decorative layer, working closely with Full Stack Developers so what gets built matches what was designed, pixel for pixel. Our Figma Designer workflow covers: 🔹 Product discovery & UX research 🔹 Wireframing and prototyping 🔹 Design systems and UI kits 🔹 Interface design across web and mobile 🔹 Accessibility (WCAG), responsive layouts 🤝 𝗛𝗼𝘄 𝗪𝗲 𝗪𝗼𝗿𝗸 🔹 Direct communication with our React Developers, React Native Developers, Full Stack Developers Node.js, UI/UX Designers, and Product Designers - no middle layers. As a dedicated Full Stack Developer React Node, and SaaS team, we bring every layer of the product under one roof: 🔹 Clear estimates and agile delivery 🔹 Clean, maintainable code 🔹 Secure API integrations with type safety in Next.js/TypeScript 🔹 Design and development moving together. Reliable products built by a team that understands both business goals and technical execution

I am a high-energy and reliable person with knowledge in several topics that have lived both in Portugal and the United States. I'm an expert in several areas of IT, such as Microsoft Office, Photoshop, Web Searching, Google My Business, Technical Support (including hardware). I am also a fluent speaker and writer in English and Portuguese and can translate to/from both languages. My strong topics are: -Crypto - General technology -Automotive -Sports -Traveling - Food & Wine Feel free to contact me to get to know me better.

⩨ Senior Fullstack Developer with a Master's Degree in Computer Science ⩨ 15+ years in IT Development, delivering solutions from small projects to startups and corporate systems ⩨ Founder of .wrk LLC, offering a full cycle of software development, technical consultation ⩨ 24/7 available for consultation and tailored solutions to meet your specific needs Greetings! I’m Alexander, an experienced Fullstack Developer and IT Founder. I bring innovative, powered approaches to every stage of development, ensuring business goals align with technology strategies. ᴅᴇᴠᴇʟᴏᴘᴍᴇɴᴛ ᴇxᴘᴇʀᴛɪsᴇ ᴡᴇʙ ᴅᴇᴠᴇʟᴏᴘᴍᴇɴᴛ: React.js, JavaScript, PHP, Symfony, Laravel, TypeScript, Drupal, Node.js, Transact-SQL, Mongo DB, MySQL, Cake PHP ᴄᴍs: WordPress, bbPress, Aweber, Strapy, WooCommerce, SASS, AJAX, JSON, Git, Bootstrap, CSS3, WPML, WPRocket, Divi, Akismet, Bitbucket, GitHub, LearnDash ᴘʀᴏᴄᴇss ᴏꜰ ᴡᴏʀᴋ Consultation 〉 Estimate 〉 Plan 〉 Develop 〉 Test 〉Deploy〉Support Transparency of the process, communication & sync on every step. ᴡʜʏ ᴡᴏʀᴋ ᴡɪᴛʜ ᴍᴇ? ⩨ Leadership in founding startups and mentoring development teams at .wrk LLC ⩨ Transparent processes with clear progress updates and open collaboration ⩨ Mentorship and code reviews maintaining the highest quality standards Let’s build your next project together!

I am passionate and knowledgeable when it comes to technology, with a Masters Degree in Software Engineering, 15 years of experience in many fields and +8000 hours on Upwork. These are my skills:  ▸ Full Stack development   • LAMP | LEMP | LAPP | LEPP   • HTML | CSS | Javascript | PHP   • JQuery | Ajax | Angular | Bootstrap | D3.js | Apex Charts   • Drupal | Wordpress [Module/Plugin dev, Divi4]   • Laravel | Grav | Kirby CMS   • Browser extension dev. (Chrome, Firefox, Safari. Edge, Opera)  ▸ System Administration   • Nginx | Apache HTTP Server | Lighttpd   • Linux: Debian | Ubuntu | CentOS | RedHat | Mandrake | Gentoo   • MySQL | Postgres | Oracle   • HTTPS(SSL cert) | IPTables| fail2ban | CloudFlare   • NextCloud | OwnCloud | FTP | SFTP | Samba   • Software versioning: Git/Gitlab ▸ Other skills:   • Python | Java | C | C++ | Lisp   • IoT: Raspbian | Node-Red | Mosquitto | Sensor data acq. Looking forward to working with you, Carlos