Senior AI Engineer

Publicis Groupe; Wokingham; On-site; GBP 60,000 - 80,000; Full time

Benefits offered by this job

Competitive base salary

Employee healthcare

Flexible working hours

25 days off + bank holidays

Discounted gym membership

Job summary

A leading global digital marketing firm is seeking a Senior AI Agent Engineer with at least 3 years of experience in AI and LLMs. You will design, develop, and deploy intelligent systems while collaborating with cross-functional teams. The ideal candidate should have strong skills in Python, proven ability with LLMs, and a solid understanding of agentic frameworks. The position offers hybrid work flexibility and a competitive benefits package including healthcare and personal development plans.

Qualifications

• Minimum of 3 years of professional experience in software development with focus on AI/ML.
• Hands-on experience in developing applications with LLMs like GPT-4 or Google Gemini.
• Experience in building agentic applications demonstrating understanding of planning and multi-agent systems.

Responsibilities

• Design, develop, and deploy LLM-based systems and AI workflows.
• Integrate various tools, APIs, and data sources for model enhancement.
• Collaborate with team to translate requirements into technical solutions.

Skills

Proficiency in Python

Experience with Large Language Models (LLMs)

Experience in AI/ML applications

Problem-solving skills

Strong communication skills

Education

Bachelor's or Master's degree in Computer Science, Engineering, or related field

Tools

AI frameworks (LangChain, LangGraph, Crew AI)

RESTful APIs

Snowflake

Job description

Overview

Location: Reading and London hybrid flexible

Experience: 3+ Years with AI

Role Overview: We are seeking a highly skilled and motivated Senior AI Agent Engineer with a strong background in building agentic AI applications and workflows. The ideal candidate will have proven expertise in utilizing Large Language Models (LLMs) such as Claude, OpenAI's GPT series, Google Gemini, and other similar technologies to design, develop, and deploy intelligent systems that can reason, act, and learn. Experience with frameworks like Crew AI, OpenAI Agent SDK, or Langgraph tool set for orchestrating multi-agent systems is highly valued. You will be a key player in our AI team, responsible for driving the technical architecture and implementation of our next-generation AI products, taking AI/LLM models from prototype to production to power Profitero+ products and internal tools.

Responsibilities

• Design, develop, and deploy LLM-based systems, agentic applications and complex AI workflows using generative AI models (Claude, OpenAI, Gemini, etc.) and relevant frameworks (e.g., LangChain, LangGraph, Crew AI, or similar).
• Deploy, operate, and iterate on AI systems in production environments, including performance tuning and cost optimization.
• Design and build Retrieval-Augmented Generation (RAG) systems using embeddings, vector databases, and semantic search.
• Build and optimize prompts and interaction strategies for LLMs to achieve desired outcomes in agentic systems.
• Integrate various tools, APIs, and data sources, potentially utilizing MCP Servers, to enhance model context and tool integration.
• Develop robust, scalable, and maintainable code in Python for all components of the agentic applications, from backend logic to API integrations.
• Implement testing, evaluation and monitoring strategies for agentic systems to ensure performance, reliability, and safety, and effective reasoning, tool usage, and failure handling.
• Collaborate closely with product managers, designers, and other engineers to translate requirements into technical solutions.
• Stay up-to-date with the latest research and developments in generative AI, LLMs, agentic systems, and protocols like MCP, evaluating their potential for our products.
• Contribute to the architecture and technical roadmap of our AI initiatives.
• Mentor junior engineers and share knowledge within the team.

Qualifications

• Bachelor's or Master's degree in Computer Science, Engineering, Artificial Intelligence, or a related field.
• Minimum of 3 years of professional experience in software development, with a significant focus on AI/ML applications.
• Proven proficiency in Python and experience with relevant AI/ML libraries and frameworks.
• Hands‑on experience in developing applications utilizing Large Language Models (LLMs) such as Claude, OpenAI (GPT‑4, etc.), Google Gemini, or other prominent generative AI models.
• Experience in building agentic applications or workflows, demonstrating an understanding of concepts like planning, memory, tool usage, and multi‑agent systems.
• Familiarity with AI workflow orchestration and agentic frameworks (e.g., LangChain, LangGraph, Crew AI, Haystack, or similar).
• Practical experience with RAG architectures, embeddings, vector databases, and semantic search.
• Experience working with Model Context Protocol (MCP) Servers.Experience with RESTful APIs and integrating external services.
• Solid understanding of software development best practices, including version control (Git), testing, and CI/CD.
• Experience with Snowflake is a plus.
• Excellent problem‑solving skills and the ability to work independently and as part of a collaborative team.
• Strong communication skills, both written and verbal.

Additional information

The above lists are not exhaustive and the job holder is required to undertake such duties as may reasonably be requested within the scope of the post.

Benefits

• Competitive base salary
• Employee healthcare
• Life assurance
• Group income protection
• Dental care plan
• Eye care scheme
• 24‑hour online GP
• Company pension
• Cycle to work scheme
• 25 days off + bank holidays + birthdays off
• Reduced gym membership
• Social events
• Employee referral scheme
• Personal development plansProfitero Hero scheme
• Flexible working hours

EEO Statement

Profitero+ is committed to creating a diverse work environment and is proud to be an equal opportunity employer. All qualified applicants will receive fair consideration for employment. Profitero recruits, employs, trains, compensates and promotes regardless of race, religion, colour, national origin, sex, disability, age, veteran status, and other protected characteristics as required by applicable law.