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Junior Machine Learning Engineer

🏢 Trainline · 📍 London · ⏰ FullTime
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Position Summary & Responsibilities

About us

At Trainline, our purpose is to empower greener travel choices, connecting people and places. Trainline enables millions of travellers to find and book the best value tickets across carriers, fares, and journey options through our highly rated mobile app, website, and B2B partner channels. 

Great journeys start with Trainline 🚄 

We’re Europe’s leading independent rail platform, helping millions of travellers find and book the best-value rail and coach journeys across our app, website and partner channels.

Our job is to make the green travel choice the best choice. By building a better train travel experience, we help more people choose rail - creating a positive impact for customers, our business and the planet.

We’re a team of more than 1,000 Trainliners from over 50 nationalities, working across London, Paris, Barcelona, Milan, Edinburgh and Madrid. Now is a brilliant time to join us and help shape the future of travel.

Introducing Machine Learning and AI at Trainline 👋 

Machine learning is at the heart of Trainline's mission to help millions of people make sustainable travel choices every day. Our ML models power critical aspects of our platform, including: 

  • Advanced search and recommendations capabilities across our mobile and web applications 

  • Pricing and routing optimisations to find the best fares for customers 

  • Personalised user experiences enhanced by Reinforced Learning Agents & Generative AI 

  • Data-driven digital marketing systems 

  • AI agents improving customer support 

Our machine learning teams own the complete delivery lifecycle from ideation to production. We work closely with stakeholders across the business to expand the understanding and impact of machine learning and AI throughout Trainline. 

🎯 Candidate Preparation Guide For Trainline Applicants

Key Role Competencies & Evaluation Highlights

Key Role Focus:

Evaluates customer-centric digital product innovation, cross-functional stakeholder management, and scalable platform engineering within travel tech.

📋 Preparation Priorities (Key Areas to Clarify):
  • 1. Siloed thinking that isolates engineering metrics from overall business and user value.
  • 2. Inability to navigate heavily regulated or multi-market enterprise ecosystems.
  • 3. Resistance to iterative delivery in favor of prolonged, perfect design phases.
✨ Recommended Role Alignment Hook:

I build frictionless consumer-facing digital journeys that ruthlessly optimize conversion while modernizing complex back-end infrastructures.

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