Principle AI Engineer

Railpen; Greater London; Hybrid; GBP 120,000 - 180,000; Full time

Benefits offered by this job

28 days annual leave

Railways Pension Scheme

4x Life Assurance cover

Hybrid and flexible working

Maternity/Paternity leave

Job summary

Railpen is seeking a Principal AI Engineer in London, offering hybrid working with 1 day per week in the office. The role leads AI capability across Technology, shaping standards, evaluating new technologies and ensuring responsible AI adoption.

You will combine deep engineering with stakeholder engagement to deliver practical AI outcomes. You will mentor teams, drive scalable AI solutions, and partner with architects and product teams to realize business value while maintaining governance and

Qualifications

• Significant software engineering experience delivering enterprise-grade applications.
• At least two years hands-on commercial AI engineering experience.
• Experience deploying AI solutions in production environments.
• Strong experience with LLMs and generative AI.
• Excellent Python programming and cloud platform experience.
• Ability to translate complex technical concepts for senior stakeholders.

Responsibilities

• Lead the design, development and delivery of AI solutions that solve business problems.
• Build scalable, secure and maintainable AI applications using modern engineering practices.
• Drive the adoption of AI across Railpen by enabling teams to realise opportunities.
• Collaborate with architects, engineers, product teams and business stakeholders to translate requirements into practical solutions.
• Evaluate emerging AI technologies and recommend where they create value.
• Define engineering standards and reusable approaches for AI development; ensure governance and security.

Skills

AI engineering

Python

Cloud platforms

Technical leadership

LLMs

Stakeholder mgmt

Governance

RAG

Azure AI

Tools

Azure OpenAI

Job description

**Principal AI Engineer***London **(hybrid working)** 1 day per week in the London office, with flexibility depending on business needs and stakeholder engagement.***About the role**We're looking for a Principal AI Engineer to help establish, grow and shape AI capability across Railpen, providing technical leadership and expertise as we develop our approach to AI.This is a newly created role and a key appointment within our Technology team. You'll play a leading role in identifying where AI can create genuine value, design practical solutions and helping us build the foundations needed to scale AI effectively and responsibly across the organisation.You'll bring together a strong software engineering background with hands-on AI expertise, working closely with colleagues across Technology and the wider business to turn opportunities into real-world outcomes. Whether that's designing new AI-powered solutions, shaping technical standards, evaluating emergingtechnologies or helping others understand what's possible, you'll be at the centre of how AI capability is developed and adopted across Railpen.This role requires someone who enjoys combining deep technical expertise with strong stakeholder engagement. You'll be comfortable engaging with senior leaders, translating complex concepts into clear language and helping build confidence in the use of AI across the business.To learn more about Railpen including our values, culture and purpose, visit our careers page **here**.**What you’ll be doing*** Leading the design, development and delivery of AI solutions that solve genuine business problems.* Building scalable, secure and maintainable AI applications using modern engineering practices.* Driving the adoption of AI across the organisation by helping teams identify and realise opportunities.* Working closely with architects, engineers, product teams and business stakeholders to translate requirements into practical solutions.* Evaluating emerging AI technologies and recommending where they can create value.* Defining engineering standards, best practice and reusable approaches for AI development across Railpen.* Ensuring AI solutions are developed responsibly, with appropriate governance, security and risk considerations.* Acting as a trusted technical expert, providing guidance and support to both technical and non-technical audiences.* Helping to develop AI capability across the wider technology function through coaching, mentoring and knowledge sharing.**What we’re looking for****Essential*** Significant experience in software engineering, including providing technical leadership and designing and delivering enterprise-grade applications.* At least two years of hands-on commercial AI engineering experience gained as part of your day-to-day role.* Proven experience building, deploying and supporting AI solutions in a production environment.* Strong experience with modern AI technologies, including Large Language Models (LLMs) and generative AI solutions.* Excellent programming skills, ideally including Python and experience working with cloud-based platforms.* Strong understanding of software engineering principles, architecture, testing and deployment practices.* Experience translating complex technical concepts into language that senior stakeholders and non-technical audiences can understand.* Excellent communication and stakeholder management skills.* A proactive and curious mindset, with a passion for staying ahead of developments in the rapidly evolving AI landscape.**Desirable*** Experience with Azure AI services, Azure OpenAI, AI Foundry or similar platforms.* Experience designing and implementing Retrieval-Augmented Generation (RAG) solutions.* Experience with agentic AI workflows and orchestration frameworks.* Experience working in a regulated environment such as financial services, pensions, insurance or banking.* Experience establishing AI standards, governance frameworks or best practice within an organisation.* Previous experience mentoring engineers or providing technical leadership across delivery teams.**Why is this role exciting now?**AI is creating new opportunities across every industry, and we're committed to building the capability needed to make a meaningful impact at Railpen. This role will play a key part in helping us realise that potential.This role offers the chance to join at a pivotal stage of our journey. Rather than inheriting a mature AI function, you'll help shape and build it. You'll have the opportunity to influence technology decisions, establish new ways of working and play a key role in defining how AI is adopted across the organisation.If you're looking for a role where you can combine technical excellence with genuine influence and impact, this is an opportunity to help shape the future direction of Railpen's AI capability.**What you’ll get in return*** A competitive salary (depending on experience) plus generous annual bonus plan* 28 days annual leave plus bank holidays* We provide membership of the Railways Pension Scheme, a Defined Benefit arrangement under which you get a pension for life and a lump sum when you retire, based on your length of service and pay* 4x Life Assurance cover* We support hybrid and flexible working along with very generous family leave including 12 months full pay maternity leave and 6 months full pay paternity leave* Take a look at the full range of benefits available to support you, click here**Next steps** If you’re excited by the opportunity to make a meaningful contribution and grow your career with us, we encourage you to apply by 23rd October 2026.