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.

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...

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.

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...

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...

Senior Scientist – Cyber AI / Machine Learning Research Location: Newport, Wales (Hybrid – 3 days onsite) Contract: 12 months (strong likelihood of extension) Rate: £50 per hour (Umbrella) ?? IR35: Inside IR35 Clearance: BPSS (must be eligible) The Opportunity We are supporting a defence organisation at the forefront of cyber security research and innovation, seeking a Senior Scientist with...

Note - role reposted after re-evaluation of grade level. About Colt Data Centre Services Colt Data Centre Services (DCS) has over 20 years’ experience in designing, building and operating energy-efficient, reliable data centres – hosting significant financial, media, corporate and cloud wholesale providers across the world. Our customers are at the heart of everything we do. We endeavour to...

Principal Grafana Network Analytics Engineer Edinburgh, UK | Fully Remote (UK-based) Engineering | Cyber Security £95,000 & Benefits Ever wanted your dashboards to actually defend the internet? This role does exactly that. I’m recruiting on behalf of a high-growth cyber security technology company that protects some of the world’s most critical online services from large-scale DDoS and...

Data Operations Engineer (Early Career) Location: London (hybrid 3 days onsite) Level: Graduate / Early Career The Opportunity We’re working with a high-growth B2B SaaS startup building an advanced enterprise data and decision intelligence platform. They’re looking for a Data Operations Engineer at an early stage in their career who enjoys working behind the scenes to keep complex systems...

Enterprise Account Executive – Data, AI, Analytics, Visualisation, Benelux, Sales, Account Management, C-Level, Tech, Business Development, Hunting, Closing FULLY REMOTE - £120k (+£120k OTE uncapped) + Benefits This is an exceptional permanent Enterprise Account Executive to join a leading tech organisation. The Enterprise Account Executive is fully Remote (you must be based in either UK or...

You will define technical strategy, design scalable data systems, mentor senior engineers, and partner closely with product, engineering, analytics, and business leaders to transform strategic goals into robust, data-driven solutions.

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.