Hire the Best Data Scientists
in Portugal

More than 3,000 reviews on G2
Rating is 4.5 out of 5.
4.5/5
of Upwork by G2 peer reviewers
Marco R.

Lisbon, Portugal

$45/hr
4.9
64 jobs

🏆 Top 3% Freelancer on Upwork | AI, Data, and Automation Specialist Hi I'm Marco 👋 I'm a Python developer with over 4 years of hands-on experience building AI systems, automation workflows, and data-driven applications for clients across multiple industries. 🌍 I speak: English, French, Spanish, and Portuguese. 🤖 I use: Cursor, Claude, Hermes Agent. ⭐ Highlights ↳ Developed 5+ MVPs that successfully secured funding. ↳ Completed 45+ Upwork contracts with a 100% Job Success Score. ↳ Built and currently maintain scalable data pipelines for 3+ companies. ↳ Built production-ready Retrieval-Augmented Generation (RAG) systems using modern LLM frameworks and vector databases. ↳ Trained 4+ founders and teams on implementing AI agents. ↳ Configured and deployed Hermes Agent workflows for multiple companies, following security and scalability best practices. ↳ Built custom automation systems powered by LLMs and generative AI for content creation, including avatar videos, images, and social media workflows. ↳ Built 30+ web scrapers on Apify. 🧠 Skills & Tools ↳ AI & RAG Systems: LangGraph, LangChain, OpenAI, ChromaDB, Pinecone. ↳ Hermes Agent: setup, debugging, create custom AI Workflows, Skill integration, Gbrain, MCPs, security best practices. ↳ Automation & Scraping: Playwright, BeautifulSoup, Apify (Actors), Camoufox. ↳ Data Science & ML: Pandas, NumPy, Scikit-Learn, PyCaret, TensorFlow, MMM (Marketing Mix Model), NLP, Optuna. ↳ Dashboards & Visualization: Plotly Dash and Data Studio. ↳ Web Development: FastAPI, Flask, CSS, HTML, Jinja2, Vibe-coding. 🚀 Side Projects ↳ Social Media Automation with Hermes Agent Built 3 custom AI workflows with 7+ integrated skills to automatically generate and publish avatar videos, infographics, and articles on X. ↳ AI Assistant (RAG) for Crypto & Blockchain News Developed a RAG system that continuously ingests, embeds, and retrieves content from multiple crypto and blockchain news sources. ↳ Web3 Analytics Dashboard (Hackathon Winner – €5k Prize) Won a hackathon challenge by building an interactive Plotly dashboard to visualize tokenized assets and blockchain analytics. ↳ AI-Generated Illustrated Books Pipeline Created an end-to-end content generation pipeline that automatically produces illustrated books using generative AI, from story generation to image creation and final assembly. ↳ Enterprise Data Pipelines & Reporting Built and maintained data pipelines connecting APIs, databases, and web scraping systems to analytics dashboards and automated reporting workflows. If you're looking for someone who can build AI applications, automate business processes, develop scalable data systems, or turn an idea into a working product, let's talk. 🤝

  • Data Science
  • Natural Language Processing
  • Data Visualization
  • Retrieval Augmented Generation
  • Analytics Dashboard
  • AI Agent Development
  • Plotly
  • Automation
  • AI Chatbot
  • LLM Prompt Engineering
  • Automated Workflow
  • API Integration
  • AI Video Generation
  • OpenAI API
  • Gemini
Sara N.

Machico, Portugal

$75/hr
5.0
11 jobs

⭐️ Top Rated Plus Freelancer I help businesses automate complex workflows, build AI-powered products, and unlock data-driven insights that scale. With a background in AI engineering, MLOps, and data science, I specialize in designing custom AI systems — from strategy to deployment — that streamline operations, enhance decision-making, and drive measurable ROI. 👉Core Skills & Expertise 🧠 Prompt Engineering — designing structured, context-aware prompts for reliable and scalable LLM outputs 🤖 GPT Builder / Custom AI Agent Development — creating tailored GPTs and agentic systems for business use cases ⚙️ AI Automation Workflows — integrating APIs, scripts, and tools like Zapier, Make, and LangChain to automate complex operations 📊 Data Analysis & Visualization — transforming raw data into clear insights using Python (Pandas, Plotly, Power BI) 🧩 Data Modeling & ETL Design — architecting robust pipelines and data models for scalable analytics 🔬 Machine Learning Engineering — developing, training, and deploying ML models in production environments (Azure, AWS, GCP) 📈 Statistical Modeling — applying regression, forecasting, and probabilistic modeling to optimize decisions 🧮 MLOps & Deployment — CI/CD for AI systems, monitoring performance, and automating retraining pipelines 🧰 Software & Cloud Engineering — Python, FastAPI, SQL, Docker, Azure Functions, and GitHub Actions 🎯 AI Strategy & Consulting — bridging business goals with technical execution through clear, actionable roadmaps 👉Whether you’re looking to: - Integrate AI into existing systems (LLMs, computer vision, or predictive analytics) - Automate repetitive business processes using Python, APIs, and no/low-code tools - Develop intelligent dashboards or agents that understand and act on data - Build end-to-end machine learning pipelines in Azure, AWS, or GCP - Transform messy data into actionable business intelligence …I can help you go from idea → prototype → production — without the technical chaos. My clients value my ability to combine deep technical expertise (Azure Functions, LangChain, GPT APIs, SQL/ETL, MLOps) with a consultative approach — ensuring every solution is not just functional, but aligned with your strategic goals. Let’s build something intelligent together.

  • Data Science
  • Data Analytics & Visualization Software
  • Data Analysis
  • Data Mining
  • Machine Learning Model
  • Data Visualization
  • Data Cleaning
  • API
  • AI Development
Joao F.

Corroios, Portugal

$55/hr
4.9
33 jobs

PhD-trained engineer building production AI applications with Python, Django, and modern LLM tooling. I take AI projects from prototype to shipped product — RAG systems, agents, custom integrations, and the full-stack web or desktop applications that wrap them. What I'm hired for: - LLM application engineering — RAG pipelines, multi-step agents, custom evaluation harnesses, OpenAI / Anthropic / open-source model integration, structured output and tool use, prompt and retrieval optimization - Django & FastAPI backends for AI products — auth, billing, async job queues, streaming responses, vector stores (pgvector, Qdrant, Chroma), observability for LLM calls - AI-powered desktop applications — Tauri (Rust) and PyQt5 for clients who need offline-capable, on-prem, or data-sensitive tools. A rare combination: most AI engineers can't ship desktop; most desktop developers can't ship AI - Scientific and R&D software — instrumentation control, data pipelines, numerical analysis. Background suited to biotech, hardware, and research-driven startups Background: - PhD in Electrical Engineering, University of Southampton (2022) - 2,300+ hours and $100K+ delivered on Upwork. Top Rated, 100% Job Success - Roles at two scientific instrumentation startups (Lightcast Discovery, CellCraft) Core stack: Python, Rust, Django, FastAPI, HTMX, PostgreSQL + pgvector, Docker, Kubernetes, AWS, OpenAI/Anthropic APIs, Tauri, PyQt5. I work best with founders and small teams who want someone senior — someone who'll push back on bad ideas, ship clean code, and stay with the project until it works in production, not just in a demo. If that sounds like what you need, send me a few sentences about what you're building and we'll talk.

  • Machine Learning
  • Python
  • LLM Prompt
  • Retrieval Augmented Generation
  • AI Agent Development
  • OpenAI API
  • Django
  • FastAPI
  • PostgreSQL
  • Vector Database
  • Docker
  • AWS Application
  • Rust
  • PyQt
  • Prompt Engineering
Adriany F.

Porto, Portugal

$15/hr
5.0
1 jobs

I'm a Data Analyst with a background in Industrial Engineering. I specialize in process optimization, data visualization, and leveraging data to address business challenges and enhance organizational efficiency. I've worked on automating data acquisition, analyzing market trends, and designing performance dashboards. My skills include Python, SQL, VBA, Power BI, and MS Excel. My focus is on applying analytical skills to drive efficiency and effectiveness. As a Master's in Data Science student, my goal is to help organizations make better decisions by uncovering insights in their data.

  • Data Analytics & Visualization Software
  • Data Analysis
  • Data Mining
  • Python
  • Microsoft Power BI
  • SQL
  • Microsoft Excel
  • Web Scraping
  • pandas
  • NumPy
Pedro S.

Lisbon, Portugal

$120/hr
5.0
10 jobs

Expert-Vetted on Upwork (Top 1%). Fractional CTO and AI engineer. 15+ years building search systems, ML platforms, credit engines, and recommendation systems across biotech, fintech, and martech. The implementation layer is getting cheaper every quarter. Judgment about what to build, when, and with what tradeoffs has gotten more valuable. That's where most of my time goes now. 𝗪𝗵𝗮𝘁 𝗜 𝗱𝗼 • Help you decide what's worth building • Help you scope it without painting yourself into a corner • Take the technical side off your plate for a while 𝗛𝗼𝘄 𝗜 𝘄𝗼𝗿𝗸 • I'll tell you not to build it if it's not worth building • I push back, and I expect you to push back on me • I take responsibility, and I expect the authority that goes with it 𝗦𝗲𝗹𝗲𝗰𝘁𝗲𝗱 𝘄𝗼𝗿𝗸 • Medical-legal document extraction. Owned architecture, build, and the calls about what to automate vs leave to humans. Weeks of analyst review compressed to minutes. The interesting problems weren't the AI ones. • Scientific AI platform for biotech R&D. Took a working PoC to a system the team actually relies on. Parser reliability, confidence calibration, CI/CD benchmarking. • AI-assisted event marketplace. Backend architecture, payments, AI planning assistant. • Domain-adapted speech recognition for spacecraft operations. Real-time voice-loop capture, indexed searchable transcripts, deployed across multiple missions. • Personalized footwear production pipeline. Parametric CAD + automated manufacturing instructions. 2 days → 30 minutes per pair. Made the unit economics work. 𝗘𝗻𝗴𝗮𝗴𝗲𝗺𝗲𝗻𝘁𝘀 • Initial Fit Call — free. 30-min call + follow-up memo with 2–3 ranked next steps. • AI Product Audit & Roadmap — from $7k, ~2 weeks. Pressure-test scope, architecture, stack, failure modes, team shape. • Fractional CTO — custom, usually 10–20 hrs/week for 3–6 months. I own architecture, technical direction, and execution quality. Stack often includes: Python/FastAPI, TypeScript/React/Next, Postgres, GCP/AWS, OpenAI/Anthropic, RAG, vector search.

  • Data Science
  • Algorithm Development
  • Data Mining
  • Machine Learning
  • Natural Language Processing
  • Python
  • Neural Network
  • Full-Stack Development
  • Web Service
  • Artificial Intelligence
  • Generative AI
  • Large Language Model
  • Recommendation System
  • Search Engine
  • Data Extraction
Ahmed A.

Lisbon, Portugal

$15/hr
5.0
7 jobs

Are you ready to redefine what's possible for your business? I'm an AI Automation Engineer specializing in building intelligent, high-impact workflows that drive tangible results. Leveraging n8n, cutting-edge AI agents, and custom code, I transform complex business challenges into seamless, automated solutions, unlocking unprecedented growth and efficiency. About Me: I am currently a Master’s student at NOVA IMS, specializing in Data-Driven Marketing. My academic rigor keeps me at the forefront of the latest trends in analytics, automation, and AI. This allows me to deliver precision-engineered solutions that aren't just innovative, but are meticulously designed for maximum ROI and measurable business impact. My foundation is built on a Bachelor's degree in Computer Science, providing a robust understanding of algorithms, data structures, and software engineering principles. Coupled with my prior experience as a Data Scientist, I possess a deep expertise in data analysis, predictive modeling, and extracting actionable insights from complex datasets. This unique blend of skills ensures that every automation I build is not only technically sound but also strategically aligned with your business goals, leveraging data to its fullest potential. What I Deliver: Next-Level Automation for Niche Workflows My expertise lies in crafting robust, scalable automations that propel businesses forward. Here's how I can empower your operations: Intelligent Lead Generation Automation: Design and deploy end-to-end systems that automatically identify, qualify, and nurture leads, ensuring a continuous flow of high-potential prospects into your sales pipeline. Hyper-Targeted Advertising Automation (Facebook & Google Ads): Automate campaign creation, optimization, and reporting. Crucially, I build seamless workflows to extract leads from your CRM (e.g., HubSpot, Salesforce) and synchronize them directly into Facebook and Google Custom Audiences, enabling unparalleled precision in targeting and retargeting that significantly boosts ad performance and reduces wasted spend. Social Media Automation & Engagement: Implement systems for automated content scheduling, posting, and engagement monitoring across platforms, enhancing your brand presence and freeing up valuable marketing time. AI-Powered Video Automation: Utilize advanced AI agents to automate aspects of video content creation, from script generation to initial editing, drastically reducing production time and cost. AI Agent Orchestration: Design and deploy autonomous AI agents for data analysis, content creation, customer support, and more, leveraging leading LLMs like OpenAI (ChatGPT, GPT-4) and Deepseek, as well as other highly demanded systems like Google's Gemini and Anthropic's Claude for diverse and powerful capabilities. n8n Workflow Development (Complex Integrations): Build robust, maintainable automations that connect your favorite tools and platforms, streamlining operations and reducing manual work, ensuring your business runs like a well-oiled machine. Custom Python & JavaScript Solutions: Extend n8n’s capabilities with advanced scripts for complex data processing, bespoke API integrations, and business logic tailored precisely to your unique needs. Popular Integrations: Expertise in connecting n8n with Google Workspace (Sheets, Gmail, Drive), Slack, Microsoft Teams, Notion, Trello, Asana, Jira, HubSpot, Salesforce, Mailchimp, Shopify, WooCommerce, Stripe, Google Analytics, Airtable, PostgreSQL, MySQL, REST APIs, GitHub, and many more. Why Partner With Me: As an AI Automation Engineer with a sales-driven mindset, I focus on solutions that convert. My approach is rooted in: Unmatched Technical Mastery & Coding Acumen: My Computer Science background and experience as a Data Scientist provide a profound understanding of technical architecture, robust coding practices, and advanced data manipulation, ensuring truly custom, high-performance automation. Strategic, Data-Driven Solutions: My Master’s studies at NOVA IMS provide a foundation in cutting-edge marketing analytics, ensuring every automation is optimized for measurable results and increased ROI. I don't just automate; I strategize for conversions. Niche Workflow Specialization: Deep expertise in complex marketing and sales automation challenges means I understand your specific pain points and can deliver solutions that directly address them for maximum impact. Client-Focused & Results-Oriented: Every solution is meticulously tailored to your unique business goals, prioritizing efficiency, scalability, and, most importantly, measurable impact on your bottom line. Transparent & Collaborative: Expect clear communication, proactive problem-solving, and a partnership approach that ensures your vision is brought to life effectively. Let's build intelligent automations that save you time, eliminate errors, and consistently drive more conversions, revenue, and growth for your business in a data-driven world

  • Machine Learning
  • Natural Language Processing
  • Python
  • Microsoft Excel
  • SQL
  • Data Analytics
  • Data Cleaning
  • Google Analytics 4
  • Google AdSense
  • n8n
  • AI Agent Development
  • HubSpot
  • JavaScript

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