Location
City of Westminster

Hours
Full Time

Salary
£50,906 per annum

About the Role
Working at HM Treasury puts you at the heart of government, making a difference to the UK economy and ultimately to people’s lives across the UK. You will join the National Infrastructure and Service Transformation Authority (NISTA), a centre of infrastructure expertise created to support the government’s 10 Year Infrastructure Strategy and reform agenda. NISTA brings together policy insight and delivery specialism to oversee infrastructure needs, unblock barriers, improve project delivery capabilities, and lead expertise on private finance.

The NISTA Data & Insight Team is a friendly, ambitious group of data scientists, engineers, analysts and digital professionals dedicated to driving better use of data in central government. Your work will directly influence how major programmes are planned, delivered and improved by turning rich project data into actionable insights and AI-enabled tools used across government, including HM Treasury, the Cabinet Office and No10.

As a Senior Data Scientist, you will develop bespoke data science products across their full lifecycle, from development to deployment and maintenance. You will apply strong technical expertise in Python programming, version control with Git, and collaborate with Data and Infrastructure Engineers to ensure robust, scalable solutions. You will communicate complex data science outputs clearly to senior leaders, enabling confident, evidence-based decision making.

You will also mentor and support junior colleagues, fostering a culture of experimentation, learning and innovation through activities such as innovation days and Python clubs. This role offers significant opportunities to deepen your technical and project management skills within a supportive and forward-thinking environment.

Key responsibilities include maintaining and developing data science products (including Python Plotly Dash and Next.js apps), expanding advanced AI tools across government, providing guidance on best practices, and ensuring user-centric product development through collaboration with multiple partners.

Experience
- Proven experience writing complex programs and scripts in Python following best practices.
- Demonstrated ability to solve problems creatively using innovative data science techniques.
- Experience working in multi-disciplinary teams and supporting the development of junior colleagues.

About you
- Strong technical expertise balanced with excellent communication skills.
- Ability to translate complex analysis into clear, engaging stories for senior stakeholders.
- Enthusiastic about fostering a culture of learning, experimentation and innovation.
- Collaborative and user-focused mindset to ensure products meet organisational needs.

Qualifications
- Relevant technical skills in Python programming and version control (Git).
- Experience with AI and machine learning tools is desirable.
- Commitment to continuous professional development and mentoring others.