{"id":3030499,"url":"https://alion.io/job/viridien-machine-learning-engineer-agentic-ai-reinforcement-learning","title":"Machine Learning Engineer - Agentic AI & Reinforcement Learning","company":{"id":15283,"name":"Viridien","domain":"viridiengroup.com","url":"https://alion.io/company/viridiengroup","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Workday","truth_index":{"grade":"A","score":91,"open_postings":7,"ghost_share":0,"stale_share":0.143,"repost_share":0,"time_to_fill_p50_days":124,"computed_at":"2026-10-24T06:02:35Z"}},"role":"AI/ML","role_family":"AI/ML","seniority":null,"employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Crawley, United Kingdom"],"countries":["GB"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"AI Agents","optional":false},{"name":"Fine-tuning","optional":false},{"name":"Function Calling","optional":false},{"name":"HPC","optional":false},{"name":"JAX","optional":false},{"name":"LLM","optional":false},{"name":"LLM Guardrails","optional":false},{"name":"Machine Learning","optional":false},{"name":"Multi-Agent Systems","optional":false},{"name":"Python","optional":false},{"name":"PyTorch","optional":false},{"name":"Reinforcement Learning","optional":false},{"name":"TensorFlow","optional":false},{"name":"AutoGen","optional":true},{"name":"DPO","optional":true},{"name":"GRPO","optional":true},{"name":"LangChain","optional":true},{"name":"LangGraph","optional":true},{"name":"Model Context Protocol","optional":true},{"name":"RLAIF","optional":true},{"name":"RLHF","optional":true},{"name":"smolagents","optional":true}],"status":"live","first_seen_at":"2026-10-21T20:15:51Z","employer_posted_date":"2026-10-21","last_verified_at":"2026-10-22T01:11:50Z","board_verified":false,"closed_at":null,"days_open":2,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":2},"description":"Viridien (www.viridiengroup.com) is an advanced technology, digital and Earth data company that pushes the boundaries of science for a more prosperous and sustainable future. With our ingenuity, drive and deep curiosity we discover new insights, innovations, and solutions that efficiently and responsibly resolve complex natural resource, digital, energy transition and infrastructure challenges.\nAre you interested in building AI systems for real-world scientific problems?\nViridien is expanding its capabilities in agentic AI, large language models and reinforcement learning for complex scientific and enterprise workflows.\nWe operate global high-performance scientific computing infrastructure delivering more than 700 petaflops and executing over one million scientific computing jobs each day across areas including geophysical imaging, materials science, biotechnology and AI-driven research.\nWe are looking for a hands-on Machine Learning Engineer to help build and evaluate intelligent agent systems, turning emerging AI methods into robust and adaptive solutions for scientific applications.\nWho you'll work with\nAs a member of our AI Lab, you'll collaborate with senior machine learning engineers, software developers, HPC specialists and scientific domain experts across Viridien. Learn more about the team on our website, in a recent blog post featuring one of our senior machine learning engineers and from our Voices of Viridien.\nWhat you'll work on\nDesigning and developing single-agent and multi-agent systems.\nImplementing and evaluating capabilities such as reasoning, planning, task decomposition, memory, tool use and agent collaboration.\nIntegrating LLMs, vision-language models, retrieval systems and domain-specific tools.\nExperimenting with fine-tuning and adapting foundation models using supervised learning, preference optimisation and reinforcement learning where appropriate.\nDeveloping training environments, reward functions, graders and feedback mechanisms.\nDesigning evaluations, guardrails and monitoring approaches for agent reliability.\nHelping turn successful prototypes into APIs, services and reusable software components.\nWhat we look for\nEssential\nDegree in computer science, artificial intelligence, machine learning, engineering or a related discipline, or equivalent practical experience.\nGood Python programming skills and an understanding of software engineering practices.\nExperience building machine-learning, generative-AI or LLM applications, gained through employment, industry or research internships, applied research or significant academic projects.\nExperience with PyTorch, JAX, TensorFlow or a similar framework.\nFamiliarity with core agentic AI concepts such as tool calling, planning, memory and workflow orchestration.\nAn understanding of reinforcement learning, preference optimisation or sequential decision-making.\nSome experience evaluating models or implementing ideas from machine-learning research.\nDesirable\nFamiliarity with multi-agent systems using LangGraph, AutoGen, smolagents or similar frameworks.\nSome exposure to LLM fine-tuning or preference and reinforcement-learning approaches, such as DPO, GRPO, RLHF or RLAIF.\nExperience designing reward functions, graders or agent training environments.\nFamiliarity with Model Context Protocol or other approaches to tool integration.\nExposure to training or deploying open-source language or vision-language models using GPUs, including distributed training.\nExperience applying AI to scientific, engineering, energy or geoscience workflows.\nWhy work with us\nCompetitive salary commensurate with experience\nHighly attractive bonus scheme\nInitial 22 days annual leave with future increases, complemented by a flexible buying and selling holiday programme\nHybrid working: three days in the office and two days at home\nCompany pension with generous employer contribution\nWellbeing Unmind app\nA flexible benefits platform with numerous discount schemes including gym membership, restaurants, cinema tickets, and more\nCycle purchase scheme\nFlexible private medical and dental care programmes\nBank Holiday Swap, allowing you to exchange a bank holiday for another day of your choice\nRelaxed dress code policy\nLearning and development\nAt Viridien, we foster a culture of continuous learning and provide tailored training programmes through our Learning Hub, designed to enhance technical, commercial, and personal growth.\nWe care for the environment\nWe encourage and actively support a strong sense of community, through volunteering and various company initiatives. As a company we are also committed to reducing our environmental impact, improving energy efficiency and accelerating sustainable solutions.\nOur Hiring Process\nAt Viridien, we are committed to delivering a respectful, inclusive, and transparent recruitment experience.\nDue to the high volume of applications we receive, we may not be able to provide individual feedback to every applicant. Only candidates whose qualifications closely match the role criteria will be contacted for an interview. We do, however, aim to share personalized feedback with those who progress to the first round of interviews and beyond.\nWe are also dedicated to ensuring that our hiring process accessible to all. If you require any reasonable adjustments to fully participate in the application or interview stages, please don’t hesitate to contact your recruiter directly.\nWe see things differently. Diversity fuels our innovation, we value the unique ways in which we differ, and we are committed to equal employment opportunities for all professionals.","description_format":"text","description_chars":5615,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"bachelor","optional":false},"security_clearance":false,"languages":[]},"benefits":["Annual leave","Continuous learning","Gym membership","Hybrid work"],"hiring_locations":[{"name":"United Kingdom","iso":"GB","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["IT Consulting & Digital Transformation","Management Consulting"],"lifecycle":[{"event":"open","at":"2026-10-21T20:15:51Z"}],"visa":[],"liveness":{"score":81,"band":"hot","label":"Hiring now","p_open":0.9,"p_active":0.903,"p_room":1,"age_days":2,"expected_fill_days":124,"reasons":["conf:52","velocity","win:early"],"computed_at":"2026-10-24T06:02:35Z"},"pay":null,"html_url":"https://alion.io/job/viridien-machine-learning-engineer-agentic-ai-reinforcement-learning","json_url":"https://alion.io/job/viridien-machine-learning-engineer-agentic-ai-reinforcement-learning.json","meta":{"generated_at":"2026-10-24T08:39:54Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":12265,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-25T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":15283},"rest":"https://alion.io/mcp/rest/get_company?id=15283"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fviridien-machine-learning-engineer-agentic-ai-reinforcement-learning"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Fviridien-machine-learning-engineer-agentic-ai-reinforcement-learning"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Fviridien-machine-learning-engineer-agentic-ai-reinforcement-learning"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/viridien-machine-learning-engineer-agentic-ai-reinforcement-learning\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fviridien-machine-learning-engineer-agentic-ai-reinforcement-learning"}]}