Senior Data Scientist jobs in Cardiff

You will work across a variety of complex analytical problems, owning experimentation end-to-end—even when ideal conditions such as user randomisation or high statistical power are not present.

You will work on real production problems rather than research-only work, owning models from first iteration through to live deployment.

You will collaborate closely with other data scientists, data engineers, and DevOps, with the freedom to shape how GenAI and ML are used across the platform.

Performance Data Scientist Department - Sport System Institute Services Salary - £41,574.01 (pro rata - £25,281.49) Working Hours - 3 days per week (22.5 hours) 12 months fixed term contract Location - Sport Wales National Centre, Cardiff Closing Date - 6th February 2026 9am Provisional Interview Date - 19th February 2026 Please go to our website to view the full advert and job...

You will work on modernizing authentication and login experiences across multiple consumer applications, helping drive growth through high-quality user experience, experimentation, and data-driven decision making. This is a collaborative role, working closely with engineers, product managers, and cross-functional partners in a fast-paced environment.

Data Scientist - £70k | Remote / Hybrid | FinTech / Payments We’re working with an established FinTech / Payments business that has been helping customers manage and move money globally for many years. The company builds technology-led products that support low-cost, multi-currency payments and money management, operating across several regulated markets. They’re now investing further in their...

You will design and build the systems that identify the signals that matter most for visibility, the retrieval and embedding architecture that feeds the models, the ranking and scoring framework that prioritises actions and the evaluation layer that measures how different LLMs behave across queries, surfaces and contexts.

Reports to: Technology Director / Executive Sponsor Location: Remote with occasional travel to London (2 times a month) Contract: Full-time, permanent Base Salary: £70,000 – £80,000 location and experience dependent + 10% company bonus scheme and sales commission scheme Why This Role Exists Serve Legal is entering a new chapter: evolving beyond compliance auditing into AI enabled,...

You will be a key technical authority for Terraform across our Azure Data and AI platforms. What You’ll Be Doing In this role, you will: - Own and lead Terraform-based infrastructure design for Azure, ensuring scalability, security, and compliance by default. - Develop and maintain advanced Terraform modules, standards, and patterns used across multiple teams and environments.

Senior Data Engineer | Remote (UK or Europe) A leading prop trading firm is hiring a Senior Data Engineer to take ownership of their trading and market data infrastructure. Operating globally with connectivity to dozens of exchanges, the firm executes millions of trades daily with data playing a mission-critical role in every aspect of the business. This is a high-impact, high-autonomy role in...

A leading insurance comparison site in Cardiff is seeking a Senior Marketing Data Scientist to bridge the gap between data and strategic marketing decisions. This hybrid role involves optimizing a multi-million pound marketing budget and shaping the company's growth. Candidates should possess expert SQL and Python skills, a deep understanding of causal inference methodologies, and proven...

You should apply if: What we’re doing here at Monzo excites you!

You will have the chance to speak to our recruitment team at various points during your process but if you do have any specific questions or want to talk through reasonable adjustments ahead of or during application please us at any point on tech-hiring@monzo.

Technology Recruitment Consultant Working Pattern: Remote-first (UK) Sector Focus: AI, Quantitative, Engineering The Opportunity: An established technology recruitment business is growing its delivery capability and is looking to add experienced recruiters to the team. The firm works exclusively with venture-backed startups and scaling technology companies, supporting highly technical hiring...

Computational Biologist / Bioinformatics Data Scientist Antiverse Engineering the future of antibody drug development to change the course of people's lives! Do you want to be part of an ambitious techbio start-up successfully tackling an issue nobody thought possible? Antiverse is seeking a Computational Biologist / Bioinformatics Data Scientist to help develop therapeutics and an enabling...

Overview Antiverse Engineering the future of antibody drug development to change the course of people's lives! Antiverse Engineering the future of antibody drug development to change the course of people's lives! Do you want to be part of an ambitious techbio start-up successfully tackling an issue nobody thought possible? Antiverse is seeking a Computational Biologist / Bioinformatics Data...

A leading financial services group in Cardiff is seeking a Data Scientist to design and deploy machine learning and AI solutions. Responsibilities include data analysis, collaboration with teams, and ensuring responsible data use. Ideal candidates will have over 3 years of experience in Data Science, strong programming skills in Python or R, and familiarity with cloud platforms. This role offers...

Spherical Search has recently partnered with a well-established Analytical Testing and CRO services organisation specialising in inhalation and nasal drug delivery. The company works with a broad range of pharmaceutical, biologics, and device organisations on a global scale. We are currently seeking a Senior Scientist to join the team in an on-site role, based within a commutable distance of...

You should apply if: What we’re doing here at Monzo excites you!

You will have the chance to speak to our recruitment team at various points during your process but if you do have any specific questions ahead of this please contact us on tech-hiring@monzo.

A prominent techbio startup in Cardiff seeks a Computational Biologist / Bioinformatics Data Scientist. This role involves processing NGS data, collaborating with lab teams, and developing data analysis pipelines against complex biomedical targets. Candidates should be fluent in Python, have strong data analysis skills, and thrive in collaborative environments. The position offers flexible...

You will partner closely with Marketing, Finance, and leadership to optimise our multi-million pound marketing budget and shape the future of our growth.

You will be a key architect of this change, bringing the critical causal inference expertise needed to elevate our team's technical standards and help us generate new, high-value ideas directly from our data.

Job Description Legal & General (L&G) is a leading UK financial services group and major global investor. We've been safeguarding people's financial futures since 1836, and strive to build a better society, while improving the lives of our customers and creating value for shareholders. Our Retail business supports customers throughout their lives, to help them save, plan, protect and enjoy...