AI Engineer (Agentic Systems)

Do you want to use your engineering skills to build agentic workflows that help find treatments for rare disease patients?

About Healx

Healx is an AI-powered tech bio company that is redesigning drug discovery. With 10,000 rare diseases affecting 400 million people globally, 90% of which have no approved treatment, Healx is on a mission to pioneer the next generation of drug discovery to help rare disease patients in need. We combine data, artificial intelligence and deep pharmacology expertise to develop treatments more quickly and cheaply than traditional drug discovery.

Diversity and inclusion sits at the heart of our mission to help people with rare diseases, and we believe that attracting and empowering a diverse team is critical to achieving this goal. We welcome applications from people from all backgrounds and walks of life.

Below we have included the qualities that we feel are required for you to excel in this role; however we appreciate that people can apply transferable skills and experience. If you think you have what it takes, love our mission and resonate with our values but are worried you don't tick every box – we still want to hear from you and encourage you to apply!

Our values

• Care for Rare – Rare disease patients are at the heart of what we do 

• Grow as individuals – We are learners always seeking to enhance our expertise 

• Win as a team – We strive to remain inclusive and diverse and we celebrate successes and lessons together

• Innovate and deliver – Our mission requires rapid innovation and calculated risks that won’t compromise our high standards 

The role

Healx is looking for an Agentic AI Engineer to build LLM-agentic workflows that power our drug discovery platform.

Reporting to our Director of Tech Strategy, you'll design and build agents that solve real drug discovery problems. Working closely with scientists across the company, you'll understand the questions that matter most to their work, then design and refine agents that reason over our knowledge graph, proprietary methods, scientific literature and other sources to generate, triage and rationalise testable therapeutic hypotheses for rare diseases.

You won't be starting from scratch. We've adopted an agentic framework (our stack currently includes Python, ADK and AgentSpace) and built workflows already delivering impact across our drug discovery platform. But this is a fast-moving field, so a big part of the role is helping us adapt as the landscape shifts. You'll work alongside the technical lead who owns our agentic infrastructure, with scope to take ownership of specific workflows and grow your influence as you do.

You'll join a cross-functional team of machine learning engineers, software engineers, bioinformaticians, drug discovery scientists and clinicians, all working to  sharpen how Healx  makes better decisions in drug discovery.

Key Responsibilities

• Build and refine AI-agentic workflows on our internal framework to help drug discovery scientists generate the best testable therapeutic hypotheses to progress.

• Translate discovery problems into agent designs, working out where an agentic approach genuinely adds value, and where it doesn’t

• Integrate agents with our knowledge graph, proprietary methods, scientific literature and other sources so they reason over the right evidence for each problem

• Expand and maintain our existing GenAI tools so they keep pace with the team’s needs and a fast-moving ecosystem

• Contribute to how we evaluate agentic workflows, helping shape sensible evals, testing and quality standards as the practice matures

• Write clear, maintainable, well-documented code that others on the team can build on

What success looks like

In 3 months, you have:

• Got to grips with our agentic framework and the discovery problems it serves, and made your first contributions land in the codebase

• Built working relationships with the scientists and engineers you partner with, and started turning their feedback into concrete improvements

In 6 months you have:

• Taken at least one agentic workflow from idea to a production tool scientists use in our drug discovery pipeline — built on our framework, with sensible evaluation and documentation

• Operating with real independence — owning agentic workflows end to end, proposing improvements.

What we are looking for

We'd love to hear from you if 

• You've built and shipped LLM-agentic systems that deliver real value — agents that use tools, orchestrate multi-step workflows and behave reliably in production.

• You have at least 2 years of software engineer or ML engineer working experience. And you have strong software engineering fundamentals — you write clear, tested, maintainable Python code that others can build on

• Fluency with the modern LLM/agent toolkit — model APIs, prompting, tool use, RAG, and the patterns this fast-moving ecosystem is converging on (MCP, agent frameworks, evals).

• You enjoy working closely with non-engineers — you are the kind of person who'll sit with a scientist to understand what they actually need.

It’s a bonus if you have:

• Experience in drug discovery, biology, or another life science domain

• Familiarity with knowledge graphs or reasoning over structured or heterogeneous data

• Experience building evaluation harnesses or testing strategies for LLM systems

• A track record of picking up unfamiliar domains quickly and becoming useful fast

• Interest in or experience with biotech / techbio and its impact on patient outcomes.

Working at Healx

Healx works from a modern accessible office in the centre of Cambridge within easy reach of the train station. We offer a flexible, diverse and inclusive working environment that considers your individual needs and believes in maintaining a sustainable work-life balance and we are open to discussing flexible working arrangements.

We are a hybrid team operating on a highly collaborative model that values synchronization and pair programming.

You will be welcomed by a team of colleagues with decades of accumulated experience in their areas of expertise, happy to help you develop your own skills in a highly collaborative environment and who are keen to provide guidance and support in your personal and career development plans.

Healx will provide you with support and guidance to help you do your best work and make an impact. We offer flexible working and believe in maintaining a sustainable work-life balance. If you require any reasonable adjustments during the recruitment process, please let us know — we’re happy to accommodate.

What’s on offer:

Financial – Competitive salary, share options, 7% employer pension contributions, life insurance of 4x base salary.

Health and Wellbeing – Private medical insurance, 25 days annual leave (plus bank holidays) with the option to purchase additional days to support a healthy work-life balance, wellbeing support via Spill and our Employee Assistance Programme.

Hybrid Working – We will only consider UK-based applicants for this position. We offer flexible and remote working options, home office set-up allowance, periodic in-person team days for company-wide collaboration and celebration.

Family Friendly – Enhanced family leave policies, miscarriage and fertility leave, flexible working practices.

Personal Development and Growth – Personal learning and development budgets, regular personal development conversations and career support.

Community Engagement and Support – One paid day off per year to volunteer for a cause aligned with our mission of supporting patients living with rare diseases; the opportunity to hear from and engage with patient groups and communities who offer us valuable insights into the experiences of those affected by rare diseases.

For more information about Healx and how we use your data please go to https://healx.ai/privacy/