Careers

AI Senior Data Scientist

Location
Lisbon
Experience
Min. 7 years

Skills

Python TensorFlow Sci-kit Learn
Description

About Us We’re more than a software company. We’re a team of visionaries turning bold ideas into real-world impact. Here, data meets cutting-edge AI to power solutions that aren’t just insightful — they’re game-changing. From predictive models to production-grade ML systems, we turn raw data into value that moves the needle.

Why Us? 🧠 A culture of innovation — Your experiments matter. We test, learn, and ship. 🌍 Diverse, multidisciplinary teams — Data, engineering, business — all in one squad. 🎓 Training on demand — Keep leveling up, we’ve got your back. 💰 Competitive salary and benefits — We reward excellence. 🚀 Clear career progression — Your growth is built into our roadmap. 🎉 Team culture you’ll love — Knowledge-sharing, offsites, and more.

What are we looking for? We’re on the hunt for a Senior Data Scientist to join our advanced analytics team and lead the design, development, and deployment of ML/AI solutions that make an impact at scale. If you thrive at the intersection of data science, engineering, and product — this is your moment.

What you’ll be doing

Building predictive and generative ML models with Python, PyTorch, TensorFlow or scikit-learn

Designing and running experiments (A/B, uplift models, causal inference)

Developing scalable pipelines for training, validation, and deployment

Applying MLOps best practices to get models into production (CI/CD, monitoring, retraining)

Exploring large datasets and extracting actionable insights with advanced analytics

Collaborating with product managers and engineers to bring data-driven features to life

Mentoring junior data scientists and driving best practices in experimentation

The skills we need ✔️ Strong Python skills and deep experience in ML/AI frameworks (scikit-learn, TensorFlow, PyTorch) ✔️ Solid background in statistics, probability, and experimental design ✔️ Proven experience building and deploying ML models into production ✔️ Experience with cloud platforms (AWS, Azure, or GCP) and MLOps tools ✔️ SQL fluency and comfort working with large-scale datasets ✔️ Great communication skills — able to simplify complex models for non-technical audiences 🎯 Bonus points if you’ve worked with GenAI, causal inference, or contributed to open-source DS projects

Are you ready? If you’re ready to turn data into real-world impact — with a team that values innovation and fun — then BySix is where you belong.

Note: BySix is an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees — regardless of who you are or where you come from. You belong here.

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Introduction
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Beginner - Basic understanding. Limited ability to use the technology without guidance.
Basic - Able to perform simple tasks and apply foundational concepts with occasional support.
Intermediate - Competent in using the technology for regular tasks. Can troubleshoot common issues independently.
Advanced - Strong proficiency. Capable of handling complex tasks and optimizing workflows effectively.
Expert - Complete mastery. Able to teach, innovate, and implement advanced solutions with the technology.
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