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Ai/ml developer

Stevenage
VARITE INC
Developer
£80,000 - £120,000 a year
Posted: 1 October
Offer description

Lead the creation of production-grade AI systems that combine the state of the art techniques in AI/ML including but not limited to classical machine learning algorithms, modern techniques such as
large-language models (LLMs), agentic AI frameworks, graph-neural networks (GNNs) and knowledge graphs
to deliver autonomous, high-value business capabilities.

Key Skills

* Design, pre-train, fine-tune and evaluate domain-specific LLMs; incorporate Retrieval-Augmented Generation (RAG) and prompt-engineering techniques to maximise factual accuracy and controllability.
* Build and orchestrate
multi-agent architectures
with frameworks such as AutoGen, LangGraph, CrewAI and LangChain to enable autonomous task planning, tool use and self-improvement.
* Experience and / or knowledge in AI safety techniques.
* Implement real-time and batch inference services; expose LLM/agent capabilities through secure REST/gRPC or event-driven APIs.
* Construct and maintain enterprise-scale
knowledge graphs
that feed ranking, recommendation and search pipelines.
* Develop and optimise
graph-neural-network models
for link prediction, node classification and reasoning over structured and semi-structured data sets.
* Establish MLOps practices—data/feature versioning, reproducible experiments, CI/CD, automated retraining and rollback—across cloud and on-prem platforms.
* Mentor engineers through code reviews, design sessions and internal workshops; influence technical roadmaps and research agendas.

Core Qualifications

* MSc/PhD in Computer Science, Machine Learning, Mathematics or related field, or equivalent industry experience.
* 5+ years software/ML engineering; 5+ years hands-on with deep-learning frameworks (PyTorch, TensorFlow, JAX) and distributed training on top of Python language.
* Demonstrable experience pre-training or extensively fine-tuning LLMs (GPT, Llama, Mistral, etc.) on multi-billion-token corpora, including RLHF or DPO techniques.
* Production experience with agentic frameworks and autonomous AI agents that learn and adapt in real-world environments.
* Hands-on knowledge of GNN libraries (PyTorch Geometric, DGL, Deep Graph Library) and graph databases (Neo4j, TigerGraph, Neptune).
* Proven ability to architect data pipelines with Spark/Flink/Databricks and deploy on AWS, GCP or Azure using Kubernetes and Terraform.

Preferred / Bonus Skills

* Experience optimising transformer models for edge devices (quantisation, pruning, distillation).
* Contributions to open-source GenAI projects, patents or peer-reviewed publications.

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