Senior Data Scientist

• Designing, developing, and validating statistical models and machine-learning solutions
• Conducting exploratory data analysis and feature engineering to uncover insights and support decision-making
• Working closely with data engineers to ensure high-quality, scalable data pipelines for modelling
• Translating analytical findings into clear, actionable recommendations for technical and non-technical audiences
• Supporting the development of analytical roadmaps, risk identification, and mitigation planning
• Contributing to the operationalisation and monitoring of models in production environments
• Evaluating emerging tools, frameworks, and methodologies to enhance analytical capability
• Providing guidance and informal mentorship to junior data scientists and analysts
• Ensuring responsible, ethical, and secure use of data and AI

• Experience in data science, machine learning, or applied analytics
• Strong proficiency in Python and common ML libraries (pandas, NumPy, scikit-learn, TensorFlow, PyTorch)
• Experience designing, training, and evaluating machine-learning models
• Solid understanding of statistical methods, predictive modelling, and experimental design
• Experience working with large or complex datasets, including data cleansing and feature engineering
• Ability to communicate analytical concepts clearly to non-technical stakeholders
• Experience working in an agile delivery environment
• Strong problem-solving skills and attention to detail

Desired Skills:

• Experience with cloud-based ML services (AWS SageMaker, Azure ML, Databricks)
• Familiarity with MLOps practices and model lifecycle management
• Experience with NLP, deep learning, or computer vision
• Knowledge of data visualisation tools (Power BI, Tableau)
• Exposure to big-data technologies (Spark, Hadoop)
• AWS certifications
• Experience supporting government or highly regulated environments

• BPSS Pre-screening required to start
• SC required for the role
• Applicants must have (or be able to obtain) SC clearance

Leidos UK! Join our team and discover a culture of collaboration, innovation, diversity, trust, caring management, communication transparency, work-life balance, and overall job satisfaction…

What we do for you: At Leidos we are PASSIONATE about customer success, UNITED as a team and INSPIRED to make a difference. We offer meaningful and engaging careers, a collaborative culture, and support for your career goals, all while nurturing a healthy work-life balance. We provide an employment package that attracts, develops and retains only the best in talent. Our reward scheme includes:

• Contributory Pension Scheme
• Private Medical Insurance
• 33 days Annual Leave (including public and privilege holidays)

• Access to Flexible benefits (including life assurance, health schemes, gym memberships, annual buy and sell holidays and a cycle to work scheme)

• Flexible Working Scheme, Pay and benefits are fundamental to any career decision. That’s why we craft compensation packages that reflect the importance of the work we do for our customers. Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement. More details are available at www.leidos.com/careers/pay-benefits.

Leidos UK & EUROPE - we work to make the world safer, healthier, and more efficient through technology, engineering and science.

Leidos is a growing company delivering innovative technology and solutions focused on safeguarding critical capabilities and transformation in frontline services, our work in the United Kingdom includes addressing some of the most complex problems in defence, healthcare, government, safety and security, and transportation.

What Makes Us Different:

Purpose: you can use your passion and abilities at Leidos to keep the people you care about safe. We are at the forefront of machine learning, AI, cyber security and solutions. Using your skills in the technology frontline by helping to build a safer world. You can inspire change.

Collaboration: having flexibility to do your job is one of our core benefits, enabling you to become part of our extraordinary team. We have been empowering our people to work flexibly for years. Whether you work from home, the office or on customer sites, we will give you the digital tools and the flexibility to work smarter and align your needs and ours.

People: Leidos empowers people from every background to be themselves and gives you the tools to learn new skills by enabling growth whilst developing. We believe that extraordinary people need opportunities to grow, to be inspired and to inspire others. At Leidos, we invest in technical academies, career rotations and a career development plans that enhance your future.

If you’re looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo - because the mission demands it. We’re not hiring followers. We’re recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We’re already at step 30 - and moving faster than anyone else dares.

For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.

£61,500.00-£78,800.00, Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $16.7 billion for the fiscal year ended January 3, 2025. For more information, visit www.Leidos.com.