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.

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 description and...

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 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.

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.

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.

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,...

Job Description The Audit Data Analytics Senior Manager role in Cardiff is an excellent opportunity to lead and enhance data-driven auditing processes for a Top-20 accountancy firm. This position requires expertise in accounting and finance, with a focus on leveraging data analytics to deliver effective solutions. Client Details The company is a well-established organisation within the UK...

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.

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.

You will play a key role in the successful delivery of major multidisciplinary development projects, driving technical excellence and supporting digital innovation.

Job Description A very exciting role has been registered with Hays Senior Finance, Cardiff. The role is to implement and improve processes while also taking ownership of management accounts in the team.This role will combine Management accounting responsibility (primarily income). With a significant, project-based piece of work focused on improving and developing our income data processes.It's...

A professional services organisation is seeking an experienced Data Architect to lead the design and evolution of its enterprise data landscape. This is a hands-on role within a data and architecture function, responsible for shaping integration patterns, master data management, and the data warehouse, ensuring data is trusted, well-governed, and fit for analytics and decision-making. Key...

Database Engineer (PostgreSQL & Python) - MUST BE BASED IN THE UK - Opportunity for a Database Engineer (Junior/Mid/Senior) to join a remote-first, UK-headquartered technology business - Competitive salary between £45,000 - £70,000 + excellent benefits including remote working, autonomy, and the chance to work on an Educational AI platform - Apply online or contact Chelsea Hackett via...

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.

Note - role reposted after re-evaluation of grade level. Find out more about the daily tasks, overall responsibilities, and required experience for this opportunity by scrolling down now. 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,...

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...

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...

Performance Data ScientistDepartment - Sport System Institute ServicesSalary - £41,574.01 (pro rata - £25,281.49)Working Hours - 3 days per week (22.5 hours) – 12 months fixed term contractLocation - Sport Wales National Centre, CardiffClosing Date - 6th February 2026 9amProvisional Interview Date - 19th February 2026Please go to our website to view the full advert and job description and...