Hire the Best App Development Freelancers
in Portugal
Cascais, Portugal
📍 React Native development for production mobile apps 📍 Full stack engineering for complex backend systems 📍 AI Agent Development for automation and intelligent workflows For more than 11 years, I’ve been working in mobile app development and full stack development, delivering scalable web platforms, high-performance mobile apps, and modern AI-driven systems. This combination allows me to build products end-to-end, from mobile UI to backend architecture and AI logic. 📱 Mobile App Development & React Native Expertise As a React Native developer, I’ve built and scaled mobile applications used in fintech, real estate, healthcare, marketplaces, and social platforms. My mobile app development experience includes: - Cross-platform iOS and Android apps - Complex user roles and permissions - Real-time features (chat, live updates, tracking) - High-load backend integrations - Clean architecture designed for long-term growth One of my key projects Breeze, a real estate mobile platform was developed end-to-end as a full stack developer and later raised $3M+ in investments. That experience strongly shaped how I approach architecture, scalability, and product quality. 🤖 AI Agent Development & Automation In parallel with product engineering, I focus heavily on AI Agent Development. As an AI Agent Developer and AI Automation Expert, I design systems that go far beyond simple chatbots. I build: - AI agents with planner-executor architecture - Multi-agent systems with task orchestration - AI chatbots connected to business data - AI automation pipelines for operations, research, and analytics - RAG systems using embeddings and vector databases These AI agents are designed to interact with real systems, APIs, CRMs, databases, internal tools, and operate as part of a real product ecosystem. My goal is always the same: turn AI from an experiment into a reliable, controllable product component. 🔗 Where AI meets Full Stack Development What makes my approach different is the combination of: AI Developer + Full Stack Developer + Mobile App Developer This means: - AI agents integrated into web platforms - Mobile apps powered by AI logic - Backend services managing agent execution - Dashboards for monitoring and control - Secure and scalable infrastructure Instead of isolated AI tools, clients get complete AI-powered products. 💡Clients usually come to me when they need: - A senior engineer who understands product logic - A CTO-level partner, not just a coder - Clean architecture from day one - Systems prepared for growth, investment, and scale That’s why many clients stay long-term and treat me as a technical partner, not a temporary freelancer.
- React Native
- Mobile App Development
- React
- iOS Development
- Android App Development
- Smartphone
- JavaScript
- Node.js
- Software Development
- Android
- AI Chatbot
- API Integration
- AI Development
- MongoDB
- PostgreSQL
- Front-End Development
- Back-End Development
- Web Development
- Firebase
- Angular
Coimbra, Portugal
I’m a Full-Stack Mobile App Developer with over seven years of experience building native and hybrid mobile apps for iOS and Android. I focus on delivering high-performing, secure, and scalable applications & MVP that help startups and enterprises turn ideas into impactful digital products. I’ve successfully delivered 300+ apps & MVP for clients across the USA, Europe, the Middle East, Africa, and Australia, collaborating with brands like The Fashion Incubator (TFI), Shop Kultivate, Jetzhub, Burnout Challenge Fitness, CoreVive LLC, BandiTours, BeautyMap, and others. I specialize in Swift, Kotlin, Java, Flutter, and React Native, with deep expertise in backend integrations and modern development workflows. What I Build & Integrate: - Social Media Integration - Maps (Google & Apple), GPS, and Location Services - NFC, QR Scanner, and Bluetooth - Payment Gateways (Stripe, Braintree, MyFatoorah, Square, Apple Pay, Google Pay) - In-App Purchases (Android & iOS) - Multi-language Localization - AdMob / Google Ads Integration - Real-time Chat, Audio & Video Calls (QuickBlox, Agora) - Authentication (Firebase, Google, Facebook, MongoDB) - Local Storage (SQLite, Core Data) - Notifications (Local + Server via FCM) My Development Process: 1. Discovery & Wireframes: We define the app’s flow, screens, and roadmap to ensure clarity before development begins. 2. UI/UX & Prototype: A functional prototype helps visualize navigation and user experience. 3. Development (Mobile + Admin): All APIs are developed and integrated across the app and backend systems. 4. Testing & QA: Comprehensive manual and automated testing ensures performance, stability, and reliability. 5. Deployment: Apps are launched to the App Store and Google Play, and source code is delivered securely via Git or Drive. 6. Maintenance & Support: Includes 30 days of free maintenance post-launch, with optional long-term support. Tech Stack: - Mobile (Native): Swift, SwiftUI, Kotlin - Mobile (Hybrid): Flutter, React Native - Web: React, Next.js, Node.js, PHP, JavaScript, TypeScript - Databases: MongoDB, PostgreSQL, Firebase - Cloud: AWS, Google Cloud, Azure, Heroku - Testing: Manual & Automated What You’ll Get Working With Me: 1. Free consultation to refine app requirements & roadmap 2. Transparent milestones with regular progress updates 3. On-demand 1:1 meetings during development 4. Advanced analytics & crash tracking (Crashlytics) 5. End-to-end data encryption & CI/CD pipeline setup 6. EU compliance and secure deployment practices, & 3 months of post-launch maintenance + ASO/SEO support (worth $2500) – FREE
- Mobile App Development
- Mobile App Improvement
- Native App Development
- Hybrid App Development
- iOS Development
- Android App Development
- Mobile App Design
- iOS
- Android
- Flutter
- React Native
- Swift
- API Integration
- App Design
- In-App Purchases
Montijo, Portugal
Looking for an Expert WordPress Developer? I specialize in creating lightning-fast, SEO-optimized, mobile-responsive WordPress websites tailored to your brand and business goals. With a 100% Job Success Score on Upwork and over 50+ WordPress projects completed in the last 6 months, I deliver custom WordPress development, speed optimization, and scalable solutions for businesses of all sizes. Whether you need a custom WordPress theme, WooCommerce integration, or Figma to WordPress conversion, I’ve got you covered. ✅ What I Specialize In: Custom WordPress Development (ACF, Gutenberg, Elementor, WPBakery) Page Speed Optimization (GTmetrix, Google PageSpeed Insights) WooCommerce Store Setup & Customization Figma/PSD/HTML to WordPress Conversion On-Page SEO (Yoast, schema, alt-tags, semantic HTML) Website Redesigns & Responsive UX Security, Malware Cleanup & Backup Why Work With Me? 🔹 Top-Rated Plus on Upwork – Trusted by global clients 🔹 100% Job Success – Proven reliability and quality 🔹 End-to-End Delivery – From planning to deployment & optimization 🔹 Fast Communication – Clear updates, on time WordPress Services Offered: 🛠️ WordPress Theme Development ⚙️ Plugin Integration & Setup ⚡ Speed Optimization & Lazy Load Setup 🎨 Elementor, Gutenberg & WPBakery Layouts 🧾 ACF Pro for Custom Layouts 🧼 Website Cleanup, Debugging, Bug Fixes 🔄 Migrations, Domain Transfers, Hosting Setup 🛒 WooCommerce Product & Checkout Customization 🧩 Page Builder Custom Layouts 🧭 Technical SEO for Better Search Visibility Tools & Technologies: WordPress, PHP, HTML5, CSS3, JavaScript, ACF, Elementor Pro, Yoast SEO, GTmetrix, Google Search Console, MySQL, WP Rocket, WooCommerce Let’s build something powerful together. Send me a message today and I’ll help turn your WordPress vision into a high-performing, SEO-friendly reality. — Manraj Sandhu Top-Rated Plus WordPress Developer Other Skills: WordPress, WordPress website, WordPress developer, WordPress designer, WordPress expert, freelance WordPress developer, hire WordPress developer, custom WordPress developer, WordPress website developer, WordPress web developer, WordPress development services, WordPress design services, professional WordPress developer, experienced WordPress developer, affordable WordPress developer, WordPress full stack developer, WordPress frontend developer, WordPress backend developer, WordPress plugin developer, WordPress theme developer, WordPress customization expert, WordPress specialist, WordPress consultant, certified WordPress developer, best WordPress developer, WordPress developer for hire, WordPress website design expert, WordPress site designer, WordPress UI designer, WordPress UX expert, WordPress Elementor developer, WordPress Gutenberg expert, WordPress ACF developer, advanced WordPress developer, WordPress troubleshooting expert, WordPress speed optimization expert, WordPress SEO expert, WordPress eCommerce developer, WordPress WooCommerce developer, WordPress online store expert, WooCommerce WordPress expert, WordPress security expert, WordPress performance expert, WordPress mobile optimization expert, WordPress migration expert, WordPress API developer, WordPress API integration expert, WordPress REST API developer, WordPress front-end expert, WordPress back-end expert, WordPress support expert, WordPress maintenance expert, WordPress website builder, WordPress layout designer, WordPress CMS expert, WordPress bug fix expert, WordPress site repair expert, WordPress revamp expert, WordPress theme customization expert, custom WordPress designer, WordPress website revamp expert, responsive WordPress developer, WordPress child theme developer, WordPress hosting expert, WordPress multisite developer, multilingual WordPress expert, WPML WordPress developer, WordPress booking system expert, WordPress blog developer, WordPress landing page designer, WordPress contact form expert, WordPress speed expert, WordPress developer USA, WordPress expert UK, WordPress developer Australia, local WordPress developer, WordPress website freelancer, WordPress web design expert, WordPress redesign expert, WordPress clone developer, WordPress site transfer expert, WordPress backup and restore expert, WordPress theme developer for hire, custom WordPress theme expert, WordPress CSS expert, WordPress HTML expert, WordPress JavaScript developer, WordPress PHP developer, WordPress MySQL expert, WordPress analytics expert, WordPress conversion expert, WordPress ecommerce site developer, WordPress frontend designer, WordPress dashboard customization expert, and WordPress full site editing expert.
- WordPress
- WordPress Development
- WordPress Website
- WordPress Website Design
- Elementor
- Website Redesign
- WordPress Landing Page
- PSD to WordPress
- WordPress Optimization
- Ecommerce Website Development
- WordPress e-Commerce
- WordPress Bug Fix
- WordPress Theme
- Website Builder
- Page Speed Optimization
Aveiro, Portugal
Having 10+ years of experience, I’m working as an AI/ML Engineer at DME. I am also enrolled as PhD student enrolled in Computer Engineering at University of Aveiro, Portugal under a Marie Skłodowska-Curie Actions (MSCA) fellowship with project SCION funded under Horizon Europe by the European Union's. Previously, I was full-time research scholar (Gen AI) at Università Ca' Foscari di Venezia . Furthermore, I worked as a Machine Learning Engineer at AgriDunya Technologies . I served as a full-time Researcher (DL/ML) during my MS studies at Tianjin University , China. I had full-time experience working as a Software Programming Instructor at Directorate of IBA Community Colleges and Schools.I have extensive experience working as a freelancer (Upwork, PeoplePerHour.com, and Fiverr) to support my family and education at the undergraduate level.
- Mobile App
- Machine Learning
- AI App Development
- AI Agent Development
- Agent GPT
- Deep Learning
- Data Analysis
- PyTorch
- Python
- AI Development
- Large Language Model
- Multimodal Large Language Model
- Data Annotation
- Data Analytics
- Computer Science
- React Bootstrap
- WordPress
- Website
- Tech & IT
Pedrogao Grande, Portugal
Do you need a reliable developer with years of experience? Do you need a developer who knows that a good communication and being on the same page is crucial for the success of a project? Do you need a developer who kicks off the project with you and stays at your side all the way to the finish line? Then you have just found the right freelancer! Here you have a quick overview about my skills: ✅ PHP (also HTML, CSS) ✅ MySQL (also MS SQL Server, Oracle, MongoDB) ✅ WordPress (also Theming and Plugins) ✅ Laravel ✅ JavaScript (and TypeScript) ✅ ASP.NET Core (using C#) ✅ Node.js and Angular My main focus is web development with PHP. I work with web since I was a teenager (I hate to admit it, but I will turn 40 soon). Back then in the 90's, I was creating websites with pure HTML. Today, I have not only finished many projects, but also have expertise in many other areas from application development in a startup company to cross platform mobile app development. It all comes back to web. It can be PHP on a classic LAMP installation, WordPress, Laravel, JavaScript, Node, Angular, ASP.NET Core and many more. If it renders in a browser, I should be able to work with it. What you can expect of me: ✔️ I am well organized ✔️ I don’t miss my deadlines ✔️ I am familiar with agile project management and scrum ✔️ You can always talk to me if something is not right I am also honest. Nobody knows everything and there is no shame in admitting it. But I am also a fast learner and I will always let you know if there is a faster and better way to reach the goal. So if you want to start ASAP just click on the “invite” button and I will happily discuss the project details with you as soon as possible. If you have just questions, don’t hesitate to ask either! I usually respond within the hour to a maximum of 24 hours.
- JavaScript
- PHP
- Objective-C
- HTML5
- C#
- CSS
- WordPress
Lisbon, Portugal
Thanks for checking out my profile! I am a UX/UI Designer with +4 years of experience, dedicated to the technical artistry of crafting user-centered experiences. Specializing in leveraging research-driven design methodologies and empathetic solutions to harmoniously balance aesthetics and functionality. All I need to start is your specifications, a description of any challenges you're encountering, or simply an initial idea for your future design product. Unsure about the specifics? Not a problem. We'll collaborate on defining the product's vision, where I'll bring fresh, unique ideas, and effective methods to create an exceptional and productive solution. From inception to the final result, I'll oversee your design project. Reach out, and let's discuss the details together. 💬 "Leo is a talented and creative designer with an exceptional eye for aesthetics. His proposals consistently delivered solutions that transcended interaction flows, adding substantial value to the business." 🎯 Deliverables: Design System, Prototyping, User Flow, User Analytics 💪 My Skills: UI Design, UX Design, Interactive Design, User Research and Testing, Wireframing, UI/UX Prototyping, User Experience Strategy, Visual Communication, Wireframing, Prototyping, Information Architecture, Competitive Analysis, User-Centered Design, Human-Centered Design, Interaction Design, Accessibility WCAG, AI digital Product, AI Mobile app ⚙️ Tools I use: • Figma, Adobe XD, Wix, Webflow • Adobe Illustrator, Adobe After Effects, Adobe Photoshop • Trello, Azure ADO, Jira, Miro, Lucid Charts, Clickup ⭐Reasons to Choose Me: ✅ Holistic Approach: Beyond aesthetics, I blend creativity with strategic thinking, emphasizing the user journey to ensure each interaction fosters meaningful connections. ✅ Data-Driven Decisions: Prioritizing data-backed decisions, I draw insights from user research and testing to inform design choices, resulting in solutions that excel both visually and functionally. ✅ Collaborative Partner: Valuing collaboration, I view clients as integral partners. Your insights and feedback drive the creation of solutions perfectly aligned with your vision and goals. ✅ Value-Added Solutions: Beyond immediate design challenges, I deliver solutions that tangibly benefit your business. My proposals focus on achieving your objectives and delivering measurable results. ✅ Proven Track Record: Backed by a history of successful projects and glowing feedback, I offer reliability, quality, and professionalism in every engagement.
- Product Design
- Prototype
- Wireframe & Prototyping Software
- UserTesting
- User Experience
- User Flow
- User-Centered Design
- User Interface Design
- Research Interviews
- UX Research
- Benchmarking
- AI App Development
- Web Accessibility
- Web Content Accessibility Guidelines
- Wireframe
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