Gen AI, LLM Engineer in Doncaster

TCS is a purpose-led transformation company, built on belief. We do not just help businesses to transform through technology. We support them in making a meaningful difference to the people and communities they serve - our clients include some of the biggest brands in the UK and worldwide. For you, it means more to make an impact that matters, through challenging projects which demand ambitious innovation and thought leadership.

The GenAI / LLM Engineer is responsible for designing, building, and deploying generative AI solutions using large language models to solve real-world business problems. The role focuses on developing scalable AI-powered applications, integrating LLMs into enterprise systems, and collaborating with product, data, and engineering teams to deliver reliable, secure, and high-quality AI solutions.

Your responsibilities:

• Design, develop, and deploy Generative AI solutions using large language models for business use cases.
• Build and integrate LLM-powered applications, including prompt pipelines, agents, and AI services.
• Implement prompt engineering, evaluation, and optimisation techniques to improve model outputs.
• Develop backend services and APIs to expose AI capabilities to applications and platforms.
• Integrate LLM solutions with enterprise data sources, vector databases, and retrieval-augmented generation (RAG) patterns.
• Ensure AI solutions meet performance, scalability, security, and reliability standards.
• Collaborate with product managers, data scientists, and engineers to translate requirements into AI solutions.
• Contribute to testing, monitoring, and continuous improvement of AI systems in production.

Your Profile

Essential skills/knowledge/experience:

• Hands-on experience with Generative AI and Large Language Models (e.g. OpenAI, Azure OpenAI, open-source LLMs).
• Proficiency in Python and experience building backend services or APIs for AI solutions.
• Solid understanding of prompt engineering, LLM evaluation techniques, and model limitations.
• Experience with RAG architectures, embeddings, and vector databases.
• Familiarity with cloud platforms (preferably Microsoft Azure) and deploying AI solutions in cloud environments.
• Good understanding of software engineering best practices, including testing and version control.
• Ability to translate business problems into practical AI-driven solutions.

Desirable skills/knowledge/experience:

• Experience with LLM orchestration frameworks.
• Exposure to fine-tuning or adapting foundation models for domain-specific use cases.
• Knowledge of responsible AI, data privacy, and model governance principles.
• Familiarity with containerisation and CI/CD for deploying AI services.
• Experience integrating AI solutions into enterprise applications or workflow.

Rewards & Benefits

TCS is consistently voted a Top Employer in the UK and globally. Our competitive salary packages feature pension, health care, life assurance, laptop, phone, access to extensive training resources and discounts within the larger Tata network. We offer health & wellness initiatives and sports events; we are the proud sponsor of the London Marathon.

Diversity, Inclusion and Wellbeing

Tata Consultancy Services UK&I is committed to meeting the accessibility needs of all individuals in accordance with the UK Equality Act 2010 and the UK Human Rights Act 1998. We welcome and embrace diversity in race, nationality, ethnicity, disability, neurodiversity, gender identity, age, physical ability, gender reassignment, sexual orientation. We are a disability inclusive employer and encourage disabled people to apply for this role. As a Disability Confident Employer, we offer an interview to applicants with disabilities or long-term conditions who meet the minimum criteria for the role.

Next Steps:

Application Process

• Online application: You can apply directly through LinkedIn/ by uploading your CV.
• Skill-Based discussion: This will be a level 1 interview with the project team, it can be via video or in-person.
• Managerial discussion: This discussion will focus on behavioural aspects and person-organisation fit.
• HR Discussion: This will be with one of the members of the HR team and will cover your career journey, aspirations for growth, compensation and any other questions you may have.

Beware of Fraudulent offers: This is to notify you that TCS does not ask for any sort of payment or security deposit from candidates at any stage of the recruitment process. The firm never sends out job offers from free internet email services like Gmail, Yahoo Mail, and so on. TCS has not authorised any third-party company to collect money on their behalf. As a vigilant job seeker, beware of fraudulent recruitment activity and protect your interests!

Due to the high volume of applications, we will be unable to contact each applicant individually on the status of their application. If you have not received a direct response within 30 days, then it should be deemed unsuccessful on this occasion.

Join us and do more of what matters. Apply online now.