Data Scientist

Trainline; Greater London; Hybrid; GBP 60,000 - 100,000; Full time

Benefits offered by this job

Private healthcare

Dental insurance

Work from abroad policy

EV Scheme

Share purchase plans

Job summary

Trainline is seeking a Data Scientist in its Customer Growth Team to shape how we evaluate marketing performance. You will apply Python, causal inference and geo-experimentation to derive actionable insights that inform high-value commercial decisions.

You will own a portfolio of measurement projects, collaborating with marketing, analytics and cross-functional partners in a hybrid London-based role to translate findings into recommendations and guide investment decisions.

Qualifications

• Strong practical experience using Python to analyse data and communicate findings.
• Experience applying causal inference, geo-experimentation or related methods to business questions.
• Commercially focused approach balancing rigour with timely decisions.
• Strong communication and ability to explain technical concepts to non- experts.
• Capacity to manage multiple projects and collaborate across teams.
• Experience with marketing measurement or marketing mix modelling is preferred.

Responsibilities

• Design and deliver robust measurement approaches for marketing impact.
• Use Python, causal inference and geo-experimentation to analyse performance.
• Combine evidence from multiple data sources to form balanced insights.
• Translate findings into practical recommendations for marketing decisions.
• Partner with marketing, analytics and cross-functional teams to define questions and scope.
• Manage several analytical projects simultaneously, balancing pace and value.
• Communicate assumptions and confidence levels when data is incomplete.
• Contribute to advancing Trainline's marketing measurement capabilities.

Skills

Python

Causal inference

Geo-experimentation

Communication

Project management

Job description

About us

We are champions of rail, inspired to build a greener, more sustainable future of travel. 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

Now Europe’s number 1 downloaded rail app, with over 135 million monthly visits and £6.3 billion in annual ticket sales, we collaborate with 270+ rail and coach companies in over 40 countries. We want to create a world where travel is as simple, seamless, eco-friendly and affordable as it should be.

Today, we're a FTSE 250 company driven by our incredible team of over 1,000 Trainliners from 50+ nationalities, based across London, Paris, Barcelona, Milan, Edinburgh and Madrid. With our focus on growth in the UK and Europe, now is the perfect time to join us on this high-speed journey.

Introducing the Trainline Customer Growth Team

The Customer Growth team helps Trainline understand and improve how our marketing builds awareness, consideration and long-term customer growth. As a Data Scientist specialising in Marketing Measurement, you will shape how we evaluate marketing performance, turning complex and imperfect data into clear recommendations that support high-value commercial decisions.

You will take ownership of a varied portfolio of focused, fast-moving measurement projects, using Python, causal inference and geo-experimentation to understand marketing impact. Working closely with marketing, analytics and other cross-functional partners, you will combine multiple signals where no single measurement approach provides the full answer, helping stakeholders make informed decisions with confidence.

In this role as the Data Scientist, you will

• Design and deliver robust approaches for measuring the effectiveness and incremental impact of marketing activity.
• Use Python, causal inference and geo-experimentation techniques to analyse performance and generate commercially relevant insights.
• Combine evidence from multiple data sources and measurement methods to provide a clear and balanced view where no single solution is definitive.
• Translate complex analytical findings into practical recommendations that enable marketing stakeholders to make informed investment decisions.
• Partner closely with marketing, analytics and other cross-functional teams to define measurement questions, shape project scope and align on successful outcomes.
• Manage several focused analytical projects at the same time, balancing pace, quality and business value across competing priorities.
• Apply pragmatic judgement when working with incomplete or imperfect data, clearly communicating assumptions, limitations and levels of confidence.
• Contribute to the continued development of Trainline's marketing measurement capabilities, identifying opportunities to improve methods, tools and ways of working.

We'd love to hear from you if you have

• Strong practical experience using Python to analyse data, build measurement approaches and communicate meaningful findings.
• Experience applying causal inference, geo-experimentation or related experimental and quasi-experimental methods to real-world business questions.
• A pragmatic and commercially focused approach, with the ability to balance analytical rigour with the need to make timely decisions.
• Strong communication skills, including the ability to explain technical concepts clearly to stakeholders with different levels of analytical expertise.
• Confidence managing several projects or workstreams simultaneously while maintaining focus on the most valuable outcomes.
• Experience working collaboratively with marketing, analytics or other cross-functional teams to turn business questions into analytical solutions.
• Ideally, experience in marketing measurement, marketing effectiveness or marketing mix modelling, although we also welcome applicants with relevant transferable experience.
• Curiosity, sound judgement and a willingness to work with ambiguity, test different approaches and learn from imperfect evidence.

More information

Enjoy fantastic perks like private healthcare & dental insurance, a generous work from abroad policy, 2-for-1 share purchase plans, an EV Scheme to further reduce carbon emissions, extra festive time off, and excellent family-friendly benefits.

We prioritise career growth with clear career paths, transparent pay bands, personal learning budgets, and regular learning days. Jump on board and supercharge your career from day one!

We're operating a hybrid model and ask that Trainliners work from the office a minimum of 60% of their time over a 12-week period. We also have a 28-day Work from Abroad policy.

Our values represent the things that matter most to us and what we live and breathe everyday, in everything we do:

• Think Big - We're building the future of rail
• Own It - We focus on every customer, partner and journey
• Travel Together - We're one team
• Do Good - We make a positive impact

We know that having a diverse team makes us better and helps us succeed. And we mean all forms of diversity - gender, ethnicity, sexuality, disability, nationality and diversity of thought. That's why we're committed to creating inclusive places to work, where everyone belongs and differences are valued and celebrated.

Interested in finding out more about what it's like to work at Trainline? Why not check us out on LinkedIn, Instagram and Glassdoor!