Lead Data Scientist Mortgages

What you will do

With your solution-oriented and proactive mindset, you translate business challenges into scalable AI solutions that create real value in our mortgage processes. You take end-to-end ownership of high-impact AI and GenAI solutions, from problem framing, solution design and experimentation to evaluation, deployment, monitoring and adoption. You ensure solutions are technically sound, reusable, scalable and effectively embedded in daily mortgage processes. You work with modern AI capabilities, including foundation models, LLMs, agentic patterns, managed AI services and emerging model platforms.

We currently use OpenAI and other AI services, and we expect you to help us assess which technologies are most suitable for each use case. You act as a senior technical sparring partner for AI engineers, architects and product leads, guiding key decisions on solution design, model choice, evaluation approaches, scalability and responsible implementation. At the same time, you help shape the technical direction for Data Science and GenAI in the mortgage domain, translating vision into concrete choices and approaches.

In this role, you also coach and mentor data scientists, strengthening both individual capabilities and the overall technical maturity and impact of the team.

• Salary between €6,378 and €8,504, based on 36 hours, depending on your knowledge and experience (you can also opt for a 40‑hours working week)
• 13th month and holiday allowance paid with your monthly salary
• 27 vacation days for a 5‑day working week and three Diversity Days
• Modern pension administered by Be Frank
• Extensive training and learning opportunities
• Up to 40 days of paid travel (NS Business Card 2nd class for unlimited travel)
• Home‑office allowance and internet reimbursement
• Hybrid model: two office days per week in Rotterdam, next to Central Station

You are a senior data science professional with a track record in applied AI, who combines technical expertise with leadership and strategic thinking. You take ownership beyond individual use cases and actively contribute to shaping how Data Science and AI are applied within the organisation.

Proven experience in leading, designing and delivering AI solutions in production, including work with LLMs, NLP and foundation models.

Strong understanding of the full data science lifecycle: from exploration and modelling to evaluation, deployment and monitoring in production environments.

Experience with cloud platforms such as Azure and/or AWS, including managed AI services.

Solid engineering mindset, with strong Python skills and familiarity with software engineering best practices.

Comfortable working with APIs; experience with developing APIs is a plus, not a must.

Continuous curiosity for new developments such as agentic AI and the ability to assess their relevance for real-world use cases.

At least 8+ years of working experience in a professional data and/or engineering environment of which at least 5+ years in developing and delivering AI or data science solutions.

Proven experience working with a wide range of stakeholders and influencing decisions based on technical expertise.

Experience in mentoring and coaching data scientists or other technical colleagues.

Strong communication skills, and the ability to challenge and inspire others.

You will work in a multidisciplinary team of Data Scientists, AI Engineers and a Product Lead, collaborating on the development of AI solutions that directly impact our mortgage customer journeys. Your team will closely collaborate with other product teams within the mortgage domain to integrate your AI solutions into the customer journey. You will also be an active member of the Data Science guild, a community of around 70 data scientists across NN.

As a senior member of both your team and the wider community, you play a key role in shaping how AI is applied at scale within NN.