Principal/Senior/Mid/Junior – Data Scientist

About Us

We are looking for Data Scientists that are passionate about the power of AI and who thrive at the intersection of business, analytics, and AI: someone who not only trains models but also deeply understands the business context in which they're applied.

About this role – Domains Department

The Data Science Domains Department powers business-critical decision-making across four key areas of enterprise operations. We build and deploy AI-driven features that transform how business leaders understand and act on complex data challenges in their specific domains.

Our Four Domains:

• Finance (FIN): We enable smarter, faster financial decision-making across the enterprise by partnering with Finance teams to improve forecasting accuracy, planning agility, and financial transparency through AI-driven solutions.
• Manufacturing & Supply Chain (M&S): We optimize the end-to-end manufacturing and supply chain with cutting-edge AI – from helping pharmaceutical companies avoid out-of-stocks to reducing machine breakdown in consumer goods factories.
• Research & Development (R&D): We partner closely with pharmaceutical and biotech companies to deliver innovative AI-driven solutions that optimize clinical trial recruitment and accelerate pipeline innovation.
• Cross-Functional (XF): We apply AI to diverse functions spanning procurement, people analytics, commercial operations, and more – developing solutions that transform these essential but often underserved areas.

Core responsibilities and skills (by seniority)

Junior Data Scientist – Up to 2 years

• Build and maintain AI-driven features (forecasting, classification, regression, recommender systems, LLM-powered features) for business use cases
• Contribute to app features with guidance from mid/senior teammates; improve models, pipelines and deliverables
• Present results and findings to your team; identify gaps and learn to explain the product and the AI behind it
• Deliver assigned tasks autonomously and on time with clear ownership

Mid Data Scientist – 2+ years

• Strong Python/SQL skills, basic MLOps knowledge (Airflow, MLflow, unit testing), and solid ML fundamentals
• Own features of the app; constantly improve models, pipelines and monitoring to ensure robust production performance
• Communicate and align with internal stakeholders; identify opportunities and explain AI behind business outcomes
• Design end-to-end ML pipelines for small projects; mentor junior team members on technical topics

Senior Data Scientist – 4+ years

• Comprehensive MLOps expertise, advanced Python/SQL skills, and domain specialization; enforce code quality standards across the team
• Own key features and projects; design and improve models, pipelines, and experimentation frameworks
• Lead 1+ major projects as AI lead with full accountability; break down work, assign tasks, and manage multiple workstreams
• Communicate and align with internal/external stakeholders; turn business requirements into AI solutions
• Provide technical mentorship; set modeling standards and drive cross-functional delivery

Principal Data Scientist – 6+ years

• Deep expertise in one technical area; lead by example on technical excellence, business acumen, and strategic vision
• Define and own AI domain roadmaps; transform ambiguous business challenges into structured action plans
• Lead 5+ simultaneous projects across multiple workstreams; shape product strategy with PM/Eng
• Demonstrate strong business acumen: estimate AI solution impact on KPIs and business outcomes
• Provide leadership for the Data Science team: mentor and manage; define standards; drive impactful cross-functional delivery

Who we're looking for (all levels)

• Someone who thrives at the intersection of business, analytics and AI and wants to ensure AI solves the right problems with measurable impact
• A scientist and builder: you explore multiple approaches, analyze results and iterate fast, balancing cutting-edge techniques with simple, scalable solutions
• A strong communicator who adapts the message to different audiences and enjoys working cross-functionally with product, engineering and business stakeholders
• Someone with a startup mindset: comfortable with ambiguity, proactive and hands-on when something needs fixing or improving
• Ready to Lead Boldly – helping business leaders make decisive decisions powered by real-time AI insights

What we offer

• Work at the forefront of AI-powered decision intelligence in a fast-growing B2B SaaS company
• Collaborate with a global team of 300+ talented professionals across Munich, Barcelona, Madrid, Cluj and New York
• Tackle real-world business challenges across Finance, Supply Chain, R&D, and Cross-Functional domains
• Hybrid work policy (2 days per week in the office) for work-life balance
• Permanent contract with competitive compensation
• Career growth opportunities across all seniority levels – from Junior to Principal Data Scientist
• A culture driven by innovation, collaboration, and a commitment to excellence
• The chance to Lead Boldly – turning complex data into decisions that drive real, measurable impact

Location & Details

• Location: Cluj-Napoca, Romania
• Contract type: Permanent
• Work policy: Hybrid (2 days per week in the office)

For questions about this role, please reach out to our Recruiting team at recruiting@principal33.com.