Data scientist jobs in Welwyn Garden CityCreate job alerts

Data Scientist - Outside IR35 - Hybrid/Scotland. A global FMCG company in Scotland is seeking a hands-on Data Scientist for a 6-month contract, starting mid-November 2026.

You are an expert in statistical analysis and machine learning with deep understanding of algorithms, methods, and their practical applications.

Collaborate closely in integrated, cross-functional teams alongside product managers, data engineers, operations, and consultants to deliver end-to-end analytical solutions and ensure continuous feedback and iteration.

Partner with stakeholders across Product, Commercial, Engineering, and Data teams to identify opportunities and translate business challenges into data-driven solutions. You will also provide technical leadership to other data scientists, contribute to best practices across the team, and help foster

We're looking for a Finance Data Scientist to join our central Data team as the first dedicated analytics partner to Finance. Partner with Analytics Engineering on the certified finance KPI layer (ARR, billing, revenue), and be the first to catch when a number is quietly wrong. Demonstrated experien

Partner directly with Marketing leadership on which niche channels, markets or formats to test next, and size the bet. Demonstrated experience measuring marketing effectiveness, ideally including offline, brand or hard-to-track channels (OOH, TV, podcast, sponsorship, events). Experience partnering

Our clients are looking for Data Scientists to join their team. Work closely with the Chief Data Scientist to align technical strategy, receive mentorship, and ensure rigorous quality assurance across all project deliverables. GCP, IBM Cloud) and related services, as well as experience with relation

Three or more years of professional experience working in a data or information management team, as a data engineer, data scientist, developer or other similar role. Degree or equivalent experience in the field of Data Science, Data Engineering, Computer Science, Software Development, Information Te

Ocado Logistics is recruiting a Senior Data Scientist in Hatfield for a 12-month fixed-term contract. You will consolidate disparate data sources, apply advanced statistical analysis and ML models, and deliver actionable insights to reduce order damages and drive strategic decisions. Key responsibil

慨正橡扯 in Welwyn is looking for a Senior Data Scientist to join their Data Science team, focusing on applying deep learning and statistical methods to solve complex business problems. The role involves modelling, prototyping, and deploying data products at scale, with a strong emphasis on innovation and collaboration. The ideal candidate will have robust programming skills, experience in statistical analysis, and familiarity with time series forecasting. A welcoming culture and numerous benefits, including a 20% annual bonus and comprehensive medical insurance, are provided. #J-18808-Ljbffr

Tesco Stores Limited is seeking a Senior Data Scientist to design forecasting and probabilistic models for large-scale retail data.

Sika is a specialty chemicals company with a globally leading position in the development and production of systems and products for bonding, sealing, damping, reinforcing, and protection in the building sector and industry. Sika has subsidiaries in 103 countries around the world, produces in over 400 factories, and develops innovative technologies for customers worldwide. In doing so, it plays a crucial role in enabling the transformation of the construction and transportation industries toward greater environmental compatibility. In 2024, Sika’s around 33,000 employees generated annual sales of CHF 11.76 billion. Join us as IT Access Engineer and help implement, automate, secure and improve our access management solution for Nuage - Sika’s global custom-built R&D data platform! In this role you will be part of a fast-growing Global R&D Digitalization team, transforming how our global R&D function develops and working on wide range of topics - from using traditional data science techniques to optimising operational efficiency along with state-of-the- art AI solutions to identify novel construction materials. This role is designed for remote working with occasional trips to Welwyn Garden City. Your main tasks will be: • Automate and streamline communication between cloud and on-prem systems., • Manage, test and debug user access groups., • Identify and fix security vulnerabilities in the access setup., • Higher education or proven track record of relevant working experience, • 2+ years of working experience with production software in the role of Software Engineer, Software Architect, Data Engineer, Data Scientist or similar, • Excellent knowledge of Python and Java, • Strong understanding of data security principles, • Experience with REST or GraphQL APIs, • Good knowledge in at least one of: Microsoft Azure, ITIL, agile work practices and/or web platform management, • Effective verbal and written communication skills, • Excellent capacity to prioritise work, • HTML/JS knowledge, • RAG and Jira/Confluence knowledge, • Competitive salary, • Holiday 25 days rising to 28 days with service, plus bank holidays, • A company pension contribution of up to 10%, • Private healthcare for you, with option to add family, • Group life cover at 6x your annual salary, • Group Income Protection (PHI) We offer competitive salaries, aligned with local market benchmarks and the specific scope and responsibilities of each role. Compensation is determined based on skills relevant to the position, education and/or training. We are committed to fair and equitable pay practices in accordance with applicable laws and regulations. #J-18808-Ljbffr

Tesco is seeking a Data Scientist to join its Data Science team, focusing on neural network‑based forecasting for large‑scale retail time series. You will design models, build end‑to‑end pipelines, and ensure robust evaluation and deployment across cloud environments. You will collaborate with engineering, product and business partners to deliver measurable value while mentoring junior team members. A strong mathematical background, Python proficiency, and experience with big data are essential. #J-18808-Ljbffr

Data Scientists are also responsible for promoting data science across Tesco and representing Tesco across the external Data Science community. Finally, as a Data Scientist, you will be expected to drive innovation and take ownership of aspects of the project development, support the Lead Data Scien

Tesco offers a generous benefits package including an annual bonus, private medical insurance, and a commitment to work-life balance.

Tesco Data Science invites applications for a Simulation Data Scientist to solve challenging supply chain and business problems using simulation. You will develop, connect and validate models across operations, collaborating in an agile team with version-controlled code and repeatable deployment practices. Based in Welwyn Garden City, you will design models at varying fidelities, integrate them across tools, and use real data to inform decisions. #J-18808-Ljbffr

Data Scientists are also responsible for promoting data science across Tesco and representing Tesco across the external Data Science community. Finally, as a Data Scientist, you will be expected to drive innovation and take ownership of aspects of the project development, support the Lead Data Scien

We’re looking for a curious and collaborative Data Scientist to join our Data Science Chapter at Tesco Mobile. Build, validate, optimise and manage data science models and data pipelines. Experience working with databases and combining multiple data sources for modelling and analysis.

The Tesco Data Science team is seeking a Simulation Data Scientist to use simulation to address challenges across the business and our supply chain from supplier to shelf.

Tesco UK is seeking a Senior Data Scientist to design and deploy forecasting and probabilistic models for large-scale retail time series. You will blend data from multiple sources and build robust pipelines for training, validation and backtesting, ensuring scalable, measurable business value. You w

You might know us as a supermarket, technology company or even for our award-winning mobile network.

Ocado Group is seeking a Senior Data Scientist in Hatfield on a hybrid basis for a 12-month FTC.The role focuses on reducing order damages and improving NPS by consolidating data sources, bridging gaps, and applying advanced statistics and ML.You will deliver insights to guide operational investment

Roche UK, based in Welwyn Garden City, is transforming healthcare by embedding advanced AI into commercial and medical strategies.As a Senior Data Scientist, you will architect cutting-edge AI frameworks, transform vast enterprise data into actionable insights, and help double the number of patients

Senior Data Scientist - AI & Machine LearningApply: Welwyn: Full time: Posted Today: End Date: October 19, 2026 (6 days left to apply): 202610-124942At Roche you can show up as yourself, embraced for the unique qualities you bring. The PositionAt Roche UK, we are transforming healthcare by

Both behind the scenes within the warehouses and across the front end of the customer experience which means we now have an opportunity for a Senior Data Scientist to join the Team on a 12 month FTC.

Tesco is seeking a Simulation Data Scientist to develop and apply simulation models across Tesco's business and supply chain, from supplier to shelf.You will build, connect and validate models, use scenario experiments, and work within an agile Data Science team to deliver reliable simulation tools.

Senior Data Scientist | Hatfield | Hybrid. Both behind the scenes within the warehouses and across the front end of the customer experience which means we now have an opportunity for a Senior Data Scientist to join the Team on a 12 month FTC. Develop other data scientists around you into more capabl

Pharmidex is seeking an experienced Technical Specialist, Bioanalysis (LC-MS) to join our Bioanalytical team. This role is intended for a highly capable LC-MS scientist who acts as a technical authority, supporting complex bioanalytical challenges across regulated and non-regulated programmes. You will play a central role in developing, optimising, validating, and troubleshooting LC-MS methods supporting small and large molecule programmes, including peptides and oligonucleotides. • Lead LC-MS/MS method development, optimisation, validation, and transfer, • Act as a senior technical problem-solver for complex analytical challenges, • Provide expert input into study design, feasibility, and assay strategy, • Support regulated bioanalysis in line with GLP/GCP expectations, • Mentor and technically support junior and mid-level scientists, • Ensure high technical standards, data quality, and compliance with SOPs, • ≥5 years’ hands-on LC-MS/MS experience in a bioanalytical laboratory, • Demonstrated expertise in advanced method development and validation, • Strong working knowledge of regulated bioanalysis (GLP/GCP), • Experience with large molecules, peptides, and oligonucleotides, • Proven ability to troubleshoot instrumentation and complex assays, • Experience in a CRO environment (strongly preferred) You’ll work as part of a collaborative, science-driven CRO delivering high-quality bioanalytical solutions across diverse therapeutic areas, with real influence over technical direction and scientific quality. #J-18808-Ljbffr

At Tesco, our Data Science team builds scalable solutions to complex business challenges across stores, online, supply chain, marketing and Clubcard. You will collaborate closely with Machine Learning Engineers and Software Engineers to ensure solutions are efficient, maintainable, and aligned with

The Tesco Data Science team are looking for a Simulation Data Scientist to use simulation to help solve challenging problems across the business and our supply chain from supplier to shelf. At Tesco, our Data Science team focuses on modelling complex business problems and deploying data products at scale. Our work spans across multiple areas including physical stores, online, supply chain, marketing and Clubcard. This requires our Data Scientists to have an advanced understanding of statistics and algorithms. The team itself is made up of researchers and practitioners with varied backgrounds from both academia and the business world. You will develop and connect simulation models to help Tesco understand, evaluate and improve operations, including supply chain, and assess proposed changes before implementation. Working with experienced colleagues, you will contribute to distributed simulations that bring together models of different processes and systems, developing awareness of relevant interoperability standards and approaches. You will build models at different levels of fidelity, learning to choose the appropriate detail for the business question, available data and computing needs. The role will involve using operational data and scenario experiments to validate models, explore trade-offs and inform decisions. Follow agile delivery methods and contribute to continuous integration and delivery practices, including version control, automated testing and repeatable deployment, to help maintain reliable simulation tools. The position will be based in our Welwyn Garden City campus. • Working with colleagues to understand operational problems and agree what a simulation needs to represent, test and measure., • Building and maintaining simulation models using Python and relevant tools, drawing on simulation and data science skills., • Creating models at different levels of detail, with guidance on choosing an approach that balances accuracy, available data and computing needs., • Helping connect models so they can run together and exchange information, including across different tools or computers in distributed or federated simulation environments., • Developing awareness of the standards and approaches used to connect simulations and applying them with support from experienced colleagues., • Preparing and analysing operational data to set up models, identify gaps and represent real-world variation., • Checking that models work as intended and comparing their results with real-world data and feedback from operational experts., • Running repeatable experiments to assess proposed operational changes, including supply chain scenarios, and compare effects on capacity, cost, service and resource use., • Explaining findings clearly, including the assumptions made, uncertainty in results and limitations of the models., • Working in an agile team to plan and deliver tasks in manageable steps, respond to feedback and raise issues early., • Writing clear, maintainable code and contributing to code reviews, version control, automated testing and reliable software releases., • Taking responsibility for agreed tasks, asking for support when needed and developing technical skills., • Python programming, with the ability to write clear, structured and testable code., • Simulation modelling and an understanding of how to represent real-world processes at different levels of detail., • Data analysis and basic statistics to prepare model inputs, understand variation and interpret results., • An understanding of how separate models or software components can exchange data and work together., • Familiarity with version control, such as Git, and an awareness of automated testing and software delivery practices., • The ability to explain technical work clearly, document assumptions and work collaboratively., • An organised approach to solving problems, learning new methods and delivering tasks in an agile team., • Building or adapting simulation models, or using object oriented programming and data science methods to investigate real-world problems., • Working with data to develop, test or evaluate models and communicate findings., • A background in a quantitative subject, such as engineering, computer science, mathematics, physics, operational research, or equivalent practical experience., • Experience connecting simulations or working in distributed or federated environments would be particularly valuable., • Exposure to simulation interoperability standards, models with different levels of detail, or automated testing and deployment would be useful but is not essential. You might know us as a supermarket, technology company or even for our award-winning mobile network. Truth is, we're all of those things, and much more. Our colleagues work with one goal in mind, helping to make every day a little better for our customers, colleagues and communities all over the world. No two customers are the same, neither are our colleagues. At Tesco, we champion a balance that lets you thrive both in and out of work. Spend 60% of your week collaborating with colleagues at our office locations or local sites and the rest remotely. Whether you're just kicking off your career, juggling passions, or navigating big life events, we're here to support you. We always welcome a conversation about flexible working, so talk to us throughout your application about how we can support. We're proud to be an accredited Disability Confident Leader, where everyone's welcome. That’s why we commit to providing a fully inclusive and accessible recruitment process. If you need support with your application, for more information. And if you're interested in joining our team but don't tick every box, don't let that hold you back from applying. When you join us in this role, you'll be employed by Tesco Stores Limited, the Tesco legal entity responsible for your employment. #J-18808-Ljbffr

Roche UK in Welwyn Garden City seeks a Senior Data Scientist to architect enterprise AI, transform vast data into actionable insights, and help expand patient access to medicines.Lead end-to-end ML development from data exploration to production deployment in collaboration with commercial and medica

Data Scientists are also responsible for promoting data science across Tesco and representing Tesco across the external Data Science community. Finally, as a Senior Data Scientist, you will be expected to drive innovation and take ownership of aspects of project development, support the Lead Data Sc

The Tesco Data Science team are looking for a Simulation Data Scientist to use simulation to help solve challenging problems across the business and our supply chain from supplier to shelf.At Tesco, our Data Science team focuses on modelling complex business problems and deploying data products at s

Tesco Stores Limited is seeking a Senior Data Scientist to lead forecasting and probabilistic modelling for large-scale retail data.

A major UK telecommunications provider is seeking a Data Scientist to join its Data Science Chapter.The role involves building data models, analyzing diverse datasets to enhance customer experiences, and collaborating within teams.With a commitment to inclusivity, the company offers a flexible worki

By driving hands-on system validation, enforcing data compliance standards, and directly enabling packaging developers and master data coordinators, this position ensures that structural packaging specifications and logistics data are digitized accurately and compliantly. Support user acceptance tes

Data Scientist for a construction tech company focused on ESG and supply chain risk, building models from scratch using Python and SQL.

Lead Data Scientist to own AI and ML capabilities for vehicle valuation and risk decisions.

Data Scientist with expertise in ESG & Supply Chain Risk is needed to build models from scratch using Python and SQL, collaborate with product teams, and contribute to GenAI reporting tools.

Seeking a freelance Data Scientist for AI training projects, requiring Python, SQL, and statistical analysis expertise. Responsible for designing complex data science problems and verifying solutions.

Work on complex RF signal data for defence and security applications. They are looking to recruit a Senior Data Re.

Our team is dedicated to delivering high-quality, end-to-end consultancy services, ranging from operational research and data analysis to.

Design end-to-end problems spanning the complete data science pipeline (data ingestion → cleaning → EDA → modeling → validation → deployment considerations). You are proficient in SQL and database operations for data manipulation and analysis. You hold a Master’s or Ph D Degree in Data S

Reporting to the Lead Data Scientist, you'll play a key role in turning complex business challenges into scalable, data-driven solutions that improve customer and business outcomes. Join our Customer Data Science & AI team and help shape the future of personalization, recommendations, and customer a

Be part of making lives better as a Support Worker at Ormesby House in West Hill, Oxted, Surrey, and experience what delivering great healthcare should feel like.Use your knowledge, experience, and caring nature to make a positive difference to the lives of people with Mental Health conditions.Y