Job Summary: Design, build, and optimize scalable data systems; extract and transform data for BI; and collaborate with BI teams. Key Highlights: 1. Being part of a growing tech startup 2. Projects across diverse sectors 3. Professional career management **About Welvaart** At Welvaart, we create **people-centric technological solutions**. Our close leadership and flexible growth culture empower team talent and elevate delivery quality. We combine **rigor**, **innovation**, and **empathy** to drive projects that transform businesses and build lasting trust-based relationships. We complement this vision with a **Digital Marketing** offering focused on performance—helping companies gain visibility, strengthen their online presence, and accelerate growth through intelligent, measurable strategies. **Role** * Design and build scalable, efficient data systems, including databases, data warehouses, and data pipelines; * Extract, transform, and load data from multiple sources, preparing information for BI; * Monitor and optimize data system performance, ensuring data is available quickly and efficiently for analysis; * Collaborate with BI teams to identify data requirements and the optimal structure for consumption; * Perform data aggregation across various platforms. **We are looking for** * Prior experience in data modeling; * Proficiency in Python, R, and Java FX Script; * Bachelor’s degree in Computer Engineering or equivalent; * English language proficiency; * Location: Lisbon; * Hybrid work: 3 days per week. **What can you discover with us?** * Being part of a growing tech startup; * Projects across diverse sectors; * Fair and equitable compensation structure (Consultant Profile); * Training and certification; * Professional career management; * 30+ partnerships. **UNLEASH THE POWER OF YOUR CAREER** Employment type: Full-time Compensation: Up to 1 800,00€ per month Benefits: * Meal card/voucher; * Health insurance