AI Developer

About TEAM LEWIS

We are a global marketing agency that has gone from start-up to multi-national in little over two decades. Our success is due to a combination of factors. Talented people delivering award-winning campaigns. Expanding client relationships into new markets or services. Making strategic acquisitions. TEAM LEWIS has won many prestigious awards including Cannes Lions PRovoke Media ICCO European Excellence PRCA Digital Digital Impact Global Digital Excellence.

At the heart of the business is TEAM LEWIS January 2021 there was a need to respond to the challenges the COVID pandemic brought to communities and charitable organisations. TEAM LEWIS saw that support was crucial and change was needed to make that happen. Our local causes scheme was launched. Every member of TEAM LEWIS can nominate a local cause close to their heart to receive a cash addition nominated causes can also benefit from a donation in kind of expertise time and the past year TEAM LEWIS has donated almost $2million to 445 causes around the world.

You can read more about TEAM LEWIS Foundation at of the role

You are a forward-thinking hands-on AI Developer who turns business problems into production-ready AI capabilities such as building fine-tuning and deploying machine learning and Generative AI solutions (including LLMs RAG and multimodal models) that are scalable secure and measurable.

You will own the end-to-end lifecycle from data preparation and experimentation through to engineering-quality delivery (APIs integrations cloud deployment on AWS/GCP/Azure and strong MLOps practices like CI/CD version control monitoring and iteration) while applying sound judgement around model performance bias privacy and responsible AI and continuously staying current with fast-moving tools and research.

Responsibilities

Development responsibilities

• Build and maintain AI/ML solutions using Python as the primary language with Java/C where high-performance services are required and R for statistical analysis/prototyping when needed

• Develop train evaluate and optimize models using PyTorch TensorFlow and Keras

• Implement classical ML pipelines and experimentation using scikit-learn (feature engineering model selection tuning validation and performance measurement)

• Build NLP/LLM capabilities using Hugging Face (model selection fine-tuning inference optimization and evaluation)

• Design and deliver RAG and LLM orchestration workflows using LangChain and/or LlamaIndex including prompt chaining tool use routing and guardrails

• Execute prompt engineering and fine-tuning strategies to improve quality reliability and task performance across use cases

• Develop and integrate multimodal AI solutions spanning text image audio and video (as applicable) including data preparation and evaluation

• Apply strong linear algebra calculus probability and statistics to diagnose model behaviour improve training stability and interpret results under uncertainty

• Design and manage data storage and retrieval patterns across SQL and NoSQL systems ensuring clean accessible well-governed datasets

• Implement semantic search and AI memory patterns using vector databases (e.g. Pinecone Milvus) including embedding strategies indexing and retrieval tuning.

• Deploy scale and operate AI workloads on AWS SageMaker Google Vertex AI and/or Azure AI including endpoint management and cost/performance trade-offs

• Establish and follow MLOps best practices: Git-based version control reproducible experiments automated testing CI/CD model registry and monitoring for drift/performance

• Debug and improve black box behaviour through systematic experimentation root-cause analysis and clear documentation of findings and decisions.

• Ensure solutions meet Responsible AI standards: privacy-by-design secure data handling bias detection/mitigation and compliance with relevant legal/ethical requirements

• Collaborate with stakeholders to translate business needs into technical requirements success metrics and delivery plans

• Stay current with new research and tooling (e.g. arXiv model releases framework updates) and proactively recommend improvements to the teams AI approach.

Agency / client communication:

• Maintains regular day-to-day contact with key internal stakeholders to manage their expectations

• Works to ensure clear communication with internal and external contacts through the most appropriate method

• Confident communication both written and verbal

Team management and leadership:

• Encourages and inspires excellence in both the development and design teams

• Motivates colleagues to work together in the most efficient manner including Project Management and Client Services

• Actively challenges the status quo looking for ways to improve solutions recommended across teams

• Consistently acknowledges and appreciates each team members contribution

• Records and shares lessons learned with team members to facilitate continuous improvement

Client relationships and new business opportunities:

• Demonstrates an understanding of clients businesses and the context of their projects

• Identifies additional opportunities as they relate to a specific project or client

• Continually seeks opportunities to improve delivery against customer requirements

• Be mindful of wider agency and client objectives and work with all areas of the business to deliver against them

About you

• Essential Skillset

  • Technical & Programming Skills

    • Strong knowledge in Python Java C and R

    • Mastery of PyTorch TensorFlow and Keras for model development

    • AI Libraries: Scikit-learn (general ML) Hugging Face (NLP/LLMs) LangChain/LlamaIndex (for RAG and LLM orchestration).

    • Generative AI Tech: Proficiency in fine-tuning prompt engineering and working with multimodal models (Text Image Audio Video).

    • Workflow of machine learning for effective data processing outline diagram

    • Knowledge in agentic workflow tools n8n Zapier or similar

  • Data Engineering & Infrastructure

    • Data Management: SQL and NoSQL databases plus experience with Vector Databases (like Pinecone or Milvus) for AI memory.

    • Cloud Platforms: Deployment experience on AWS SageMaker Google Vertex AI or Azure AI.

    • MLOps: Knowledge of CI/CD for machine learning version control (Git) and mode

• Confident communication both written and verbal occasional client meetings may be required

• A proactive approach and an ability to work independently

• Must have strong communication skills written and verbal

• A well-rounded understanding of modern web technologies

• Experience of delivering technically sophisticated/complex creative solutions demonstrable ability to talk the talk with clients suppliers and business stakeholders

This job description is not intended to be an exhaustive list of the responsibilities for this role. Other responsibilities may be added from time to time.

TEAM LEWIS is an Equal Opportunity Employer. We are committed to creating and fostering an environment focused on equality empowerment and respect. We strive to create an inclusive workplace that supports and celebrates our diversity. We continue to invest in our efforts to ensure that TEAM LEWIS is a place where everyone can thrive.