Freelancers using SQL in MadridFreelancers using SQL in Madrid
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Esteban Aleart Salas's avatar
Esteban Aleart Salas
Madrid, Spain
Full Stack Dev & SaaS Architect, scalable B2B platforms.
Full Stack Dev & SaaS Architect, scalable B2B platforms.
Cover image for Parabola is a no-code automation
Parabola is a no-code automation platform that allows users to create custom workflows and automate tasks without requiring extensive coding knowledge. The platform provides a visual interface for designing workflows, integrating with various apps and services, and automating tasks. Key Features: * No-code workflow automation * Visual interface for designing workflows * Integration with various apps and services * Customizable workflows * Automation of repetitive tasks
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Cover image for * Personal Assistant: friendly and intelligent
* Personal Assistant: friendly and intelligent personal assistant, designed to provide helpful and informative responses. * Skills: can understand and respond to questions and has knowledge in a wide range of topics, from technology and programming to history and culture. * Conversation: can engage in real-time conversations, responding to questions and providing helpful information. * Information Search: can search for information from a variety of sources to provide accurate and up-to-date answers. * Learning: Tontin can learn and improve over time, thanks to user feedback and interaction. * Accessibility: is available 24/7, and can be accessed from any device with an internet connection. * Personalization: Tontin can adapt to the needs and preferences of each user, providing personalized and relevant responses.
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Cover image for Real Estate Demo * Admin Panel: the
Real Estate Demo * Admin Panel: the website offers an admin panel to manage properties, including creating, editing, and deleting properties. * Property Management: allows for managing properties, including assigning categories, subcategories, and tags. * Property Details: each property has a details page that includes information such as: + Description + Images + Features (bedrooms, bathrooms, square footage, etc.) + Location (map and address) + Price and currency * Filters and Search: the website offers filters and search functionality to find properties by category, location, price, etc. * Responsive Design: the website has a responsive design, which means it adapts to different screen sizes and devices.
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Cover image for DoctorCar is a workshop management platform
DoctorCar is a workshop management platform that offers tools to manage and organize the work of mechanics, as well as manage the relationship with customers. * Workshop Management: allows management and organization of mechanics' work, including task assignment and progress tracking. * Customer Management: allows management of customer relationships, including the creation of customer profiles, tracking of repair history, and invoicing. * Inventory Management: allows management of spare parts and materials inventory, including stock updates and order management. * Reporting and Analysis: allows generation of reports and analysis on workshop performance, including mechanic productivity and service profitability.
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SQL(9)
Fernando Ospina's avatar
Fernando Ospina
Madrid, Spain
Passionate tech enthusiast
Passionate tech enthusiast
Cover image for Snowflake Data Pipeline Project
Snowflake Data Pipeline Project
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Cover image for US Census Data Visualisation
US Census Data Visualisation
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Cover image for OECD COVID-19 Dashboard
OECD COVID-19 Dashboard
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SQL(1)
Paloma Dominguez's avatar
Paloma Dominguez
Madrid, Spain
Customer Success, Product & Growth | Scaling B2B SaaS
Customer Success, Product & Growth | Scaling B2B SaaS
Cover image for Full-Stack Development for obesity tracking platform
Full-Stack Development for obesity tracking platform
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Cover image for Scaling Contestia – Growth & Customer Success Strategy
Scaling Contestia – Growth & Customer Success Strategy
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Cover image for Co-Designing a Mixed Reality Learning Experience
Co-Designing a Mixed Reality Learning Experience
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Cover image for Enhancing SaaS UX & Retention
Enhancing SaaS UX & Retention
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SQL(1)
Dilson Cassaro's avatar
Dilson Cassaro
Madrid, Spain
Data, QA & AI Evaluation Specialist
New to Contra
Data, QA & AI Evaluation Specialist
Cover image for E-commerce Sales Dashboard in Power
E-commerce Sales Dashboard in Power BI Interactive Power BI dashboard designed to analyze e-commerce sales performance. The dashboard presents key business metrics related to revenue, customers, and product performance through interactive visualizations. I built the dashboard to organize business data into clear KPIs and visual views that make it easier to monitor sales performance and identify relevant patterns. The project demonstrates practical experience in Power BI, data analysis, KPI reporting, dashboard design, and data visualization.
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Cover image for E-commerce sales analysis using SQL
E-commerce sales analysis using SQL and Python to identify business trends and customer insights. The project combines SQL-based analysis with Python to explore sales performance, revenue trends, product performance, and customer-related patterns. I used SQL to query and aggregate the data and Python to further manipulate, analyze, and visualize the results. The analysis demonstrates practical experience in SQL querying, data manipulation, exploratory data analysis, data interpretation, and business-focused reporting.
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Cover image for Personal data analysis project exploring
Personal data analysis project exploring Airbnb listings in Madrid using Python and Pandas. The project focused on cleaning, validating, and exploring a real-world dataset to identify patterns in Airbnb listings, pricing, and location. I used Python and Pandas to prepare the data, handle inconsistencies, perform exploratory analysis, and extract meaningful insights from the dataset. The analysis included comparing average prices across Madrid neighborhoods and identifying geographic patterns in listing prices. The visualization shown here highlights the 10 most expensive neighborhoods for entire-home Airbnb listings based on average price. Skills demonstrated: Python, Pandas, data cleaning, exploratory data analysis, data interpretation, and data visualization. This project is part of my independent data analytics portfolio and demonstrates my ability to turn raw datasets into structured analysis and clear, actionable insights
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Cover image for Task Assignment Tool is a
Task Assignment Tool is a web-based application I built with Python and Streamlit to help team leads assign and manage tasks across multiple testers. The application was designed to address practical workload-management and task-allocation challenges in multi-user testing environments. Users can upload team rosters in CSV or Excel format, create and assign tasks based on language requirements, monitor tester availability and workload, and manage assignment conflicts when multiple users are working simultaneously. The tool also generates reports with actionable insights and supports real-time collaboration, making task allocation and workload distribution more transparent and structured. The project demonstrates practical experience in Python application development, workflow automation, data handling, workload management, and building tools designed around real operational problems. Tech stack: Python, Streamlit, GitHub.
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SQL(2)