The Portfolio Group

About the Company

The Portfolio Group is a specialist recruitment agency dedicated to sourcing exceptional talent across four key divisions: Payroll, Credit Control, Procurement and HR, Benefits & Reward.

We also provide comprehensive RPO solutions, partnering with businesses to streamline their recruitment processes.

Over 30 Years of Recruitment Excellence

Founded in 1988, we bring over three decades of industry expertise and a proven track record of recruiting at all levels across the UK and multiple industry sectors.

With offices in London, Manchester, Dublin, and Toronto, we deliver success in permanent, temporary, and contract recruitment, offering a fast, efficient, and consultative service backed by an impressive client base. Our commitment to strong client relationships, ethical recruitment practices, and passion for what we do sets us apart.

As of January 2025, The Portfolio Group is ranked #1 Recruitment Agency on Trustpilot based on over 2,500 reviews.

Comprehensive Recruitment Solutions

Beyond our core divisions, we also recruit for a range of business-critical functions, including but not limited to:

* Credit Control & Finance
* Governance, Risk Management & Compliance
* Health & Safety
* HR, Compensation, Benefits & Reward
* IT - Development, Projects & Services
* Legal Services
* Payroll & Tax
* Procurement & Supply Chain
* Sales, Marketing, PR & Communications

Award-Winning Recruitment Agency

The Portfolio Group has been recognised for its excellence in recruitment, earning accolades such as:
* The Sunday Times 100 Best Small Companies to Work For (most recently in 2017)
* The Sunday Times Fast Track 100 (twice)
* The Recruiter Hot 100 (2021)
* Shortlisted for Recruitment Agency of the Year - Medium (50-99 employees) in 2021

Contact Us
London & the South: +44 207 247 9455
Manchester & the North: +44 161 836 9949
Dublin & the Republic of Ireland: 1800800281
Toronto: +1 (647) 660 1581

Listed Jobs

Company Name

The Portfolio Group

Job Title

Principal AI Engineer

Job Description

**Job Title** Principal AI Engineer **Role Summary** Design, build, and deploy production‑grade generative AI solutions. Lead engineering of Retrieval‑Augmented Generation (RAG) pipelines, agentic workflows, and evaluation frameworks. Translate strategic vision into scalable, maintainable code, partnering with platform, product, and delivery teams. **Expectations** * Own end‑to‑end architecture and implementation of complex AI systems. * Deliver high‑quality, production‑ready code with rigorous testing. * Mentor and provide technical leadership to a growing AI engineering team. * Balance rapid experimentation with reliable production deployment. **Key Responsibilities** 1. Engineer end‑to‑end generative AI systems (RAG, agentic workflows). 2. Build scalable RAG pipelines integrating proprietary and domain content. 3. Apply model adaptation techniques (prompting, fine‑tuning, knowledge distillation) to optimise latency, cost, and output quality. 4. Define and run experiments to evaluate correctness, faithfulness, and robustness. 5. Contribute to advanced retrieval methods (Graph‑RAG, structured knowledge bases). 6. Oversee code quality, performance, and security across AI services. 7. Mentor junior engineers and maintain high coding standards. 8. Collaborate cross‑functionally with product managers, platform engineers, and delivery leads to transition prototypes to production. **Required Skills** * Advanced Python for production AI (LlamaIndex, LangChain, LangGraph). * Proven design and delivery of RAG systems; Graph‑RAG knowledge preferred. * Expertise in model adaptation: prompting, fine‑tuning, instruction tuning, distillation. * Strong grasp of generative AI evaluation: correctness, faithfulness, robustness. * Experience leading technical design of ML/AI production systems. * Excellent communication and cross‑team leadership. **Required Education & Certifications** * Bachelor’s or Master’s degree in Computer Science, Engineering, or related field. * Professional certifications in AI/ML (e.g., AWS Certified Machine Learning‑ Specialty, GCP Professional Machine Learning Engineer) are a plus.

London, United kingdom

On site

Senior

29-12-2025