Machine Learning Engineer - Agentic AI & RL

Salary: £53,000 - 93,000 per year

Requirements:

• We require a degree in computer science, artificial intelligence, machine learning, engineering or a related discipline, or equivalent practical experience.
• We require strong Python programming and software-engineering skills.
• We require experience developing machine-learning, generative AI or LLM applications.
• We require practical experience with PyTorch, JAX, TensorFlow or a similar framework.
• We require an understanding of agentic AI concepts such as tool calling, planning, memory and workflow orchestration.
• We require knowledge of reinforcement learning, preference optimisation or sequential decision-making.
• We require experience designing model evaluations and translating research ideas into reliable software.
• We prefer experience developing multi-agent systems using LangGraph, AutoGen, smolagents or similar frameworks.
• We prefer experience with LLM fine-tuning, DPO, GRPO, PPO, RLHF or RLAIF.
• We prefer experience designing reward functions, graders or agent training environments.
• We prefer experience with Model Context Protocol and tool integration.
• We prefer experience deploying open-source language or vision-language models, including distributed training or GPU computing.
• We prefer experience applying AI to scientific, engineering, energy or geoscience workflows.

Responsibilities:

• We design and develop single-agent and multi-agent systems for complex workflows.
• We build reasoning, planning, task decomposition, memory, tool-use and agent-collaboration capabilities.
• We integrate LLMs, vision-language models, retrieval systems and domain-specific tools.
• We fine-tune and adapt foundation models using supervised learning, preference optimisation and reinforcement learning where appropriate.
• We develop training environments, reward functions, graders and feedback mechanisms.
• We develop evaluation, guardrail and monitoring approaches for agent reliability.
• We convert prototypes into production-ready APIs, services and reusable software components.

Technologies:

• Agentic AI
• AI
• Fine-tuning
• Support
• LLM
• Machine Learning
• PyTorch
• Python
• TensorFlow

More:

Viridien is an advanced technology, digital and Earth data company that pushes the boundaries of science for a more prosperous and sustainable future. We discover new insights, innovations and solutions that efficiently and responsibly resolve complex natural resource, digital, energy transition and infrastructure challenges. We are expanding our capabilities in agentic AI, large language models and reinforcement learning for complex scientific and enterprise workflows. The role is based in Crawley, United Kingdom and is full time. We offer a competitive salary, highly attractive bonus scheme, initial 22 days annual leave with future increases, hybrid working with two days at home, a company pension with generous employer contribution, wellbeing support, a flexible benefits platform, cycle purchase scheme, flexible private medical and dental care programmes, holiday swap and buy-and-sell holiday options, relaxed dress code, and tailored learning and development through our Learning Hub. We also foster a strong sense of community, support volunteering and company initiatives, and are committed to environmental sustainability, inclusive hiring and equal employment opportunities.

last updated 36 week of 2026