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Senior Data Scientist - Middle Mile & Pitstops

Company mission

In the future, almost everything we consume will simply materialise on our doorsteps – what we call “e-commerce” today will simply be “commerce” tomorrow. But if we continue on today’s trajectory, the growth of e-commerce risks damaging the environment, alienating our communities, and straining the bottom-line for small businesses.

Relay is an e-commerce-native logistics network. We are built from the ground up for environmental, social, and economic sustainability. By building from the ground up we are able to entirely rethink both the middle and last mile enabling us to reduce the number of miles driven to deliver each parcel, lower carbon emissions, and lower costs, all while channelling funds to community members.

At the same time, we’re fixing the last broken aspect of e-commerce for consumers: delivery. As shoppers, we should have complete control over when and how we receive our purchases, and we should be able to return unwanted items as easily as we ordered them. That’s why whenever you buy from a merchant powered by Relay, you’ll be able to reschedule your delivery at any time. And if you don’t like what you ordered, at the tap of a button we’ll send someone to pick it up.

To orchestrate this complex ballet, Relay relies on a wide range of technologies, from advanced routing and planning to sophisticated user experiences that guide our team members on the ground. 

About the role

As a highly operational business, we rely on data science to power nearly every part of our network — from forecasting parcel volumes, to pricing and planning courier capacity, to understanding and improving the economics of our operation.

We’re hiring a Senior Data Scientist to help us optimise our middle mile operation and model the growth, performance, and economics of our pitstop network. This role spans across domains, touching forecasting, operations, and commercial planning, and is ideal for someone who thrives on applying models in ambiguous, real-world environments.

You’ll work with squads across routing, sortation, first mile, last mile, marketplace, and commercial functions; you’ll focus on middle mile optimisation, pitstop expansion, and understanding the long-term financial value of our physical network. You’ll also bring together data from across the business, often fragmented or messy, and use smart tooling, automation, and AI to transform it into usable insight.

You’ll need to be hands-on and pragmatic; it’s a high-impact role with strong exposure to leadership and decision-making across the business.

What you’ll do

  • Model and improve the cost, quality, and efficiency of middle mile operations, including vehicle use, timings, and handover reliability

  • Partner with marketplace and ops teams to optimise driver acquisition, targeting, and pricing for the middle mile

  • Optimise pitstop expansion in line with volume growth, capacity, and service levels

  • Model pitstop-level LTV and unit economics to support capital investment and performance tracking

  • Collaborate with other data scientists to support geo-sequencing, zone design, and integration with routing models

  • In partnership with MLE and Staff Data Scientists, orchestrate and automate model pipelines in production

  • Act as a thought partner for operations, commercial, and finance leads — bringing a scientific lens to planning and network growth

What we’re looking for

  • 6+ years of experience in data science, with a strong record of delivering models into production

  • Deep experience with Python and SQL

  • Strong foundations in statistics and probability, with experience applying them in operational and/or financial contexts

  • Comfort working in ambiguity and navigating messy or incomplete data

  • Effective communication skills — you can explain technical results clearly to non-technical audiences

  • Comfort working across functions and disciplines to drive impact

Nice to haves

  • Experience working in logistics, marketplaces, or similarly complex operational businesses

  • Exposure to business planning, pricing, or commercial decision-making; experience with forecasting, scenario, and financial modelling (including partnering with Finance and Commercial teams and their models (in Excel, Google Sheets))

  • Familiarity with geospatial data

  • Experience in fast-scaling startups or operational teams

We're flexible on experience – if you’re an experienced and pragmatic data scientist, with a track record of driving impact, we’d love to hear from you.

What we offer

  • 25 days annual leave per year (plus bank holidays).

  • Equity package.

  • Bupa Global: Business Premier Health Plan - Comprehensive global health insurance with direct access to specialists, dental care, mental health support and more.

  • Contributory pension scheme.

  • Hybrid working

  • Free membership of the gym in our co-working space in London.

  • Cycle-to-work scheme

  • A culture of learning and growth, where you're encouraged to take ownership from day one.

  • Plenty of team socials and events - from pottery painting to life-size Monopoly and escape rooms

Average salary estimate

$90000 / YEARLY (est.)
min
max
$80000K
$100000K

If an employer mentions a salary or salary range on their job, we display it as an "Employer Estimate". If a job has no salary data, Rise displays an estimate if available.

What You Should Know About Senior Data Scientist - Middle Mile & Pitstops, Relay Technologies

Relay is on a mission to redefine e-commerce by bringing sustainability to the forefront of logistics. We're seeking a talented Senior Data Scientist to join our dynamic team in London. In this role, you'll have the opportunity to manipulate data and enhance our middle mile operations, ensuring that deliveries are efficient, economical, and environmentally friendly. Your expertise in developing models and frameworks will directly influence courier capacity planning, delivery efficiency, and the overall performance of our pitstop network. You'll collaborate with various teams, from routing to marketplace functions, applying your data science skills to tackle real-world problems. Ideally, you thrive in navigating messy data and can draw meaningful insights from it, helping Relay deliver on its promise of a seamless and sustainable delivery experience. You'll not only be a key player in ensuring timely deliveries but also play a critical role in shaping the future of logistics as we optimize routes, expand our pitstop network, and improve our service levels. Come be part of a company that’s not just about e-commerce, but about making a positive impact in the community and environment. If you’re ready to make your mark in data science and help us change the way our customers experience delivery, we want to hear from you!

Frequently Asked Questions (FAQs) for Senior Data Scientist - Middle Mile & Pitstops Role at Relay Technologies
What are the key responsibilities of a Senior Data Scientist at Relay?

As a Senior Data Scientist at Relay, you'll be responsible for optimizing our middle mile operations, which includes modeling and improving vehicle use and handover reliability. You'll partner with various teams to enhance driver acquisition and pricing, and work on optimizing pitstop expansion aligned with our growth strategy. Your role will also involve collaborating with colleagues to automate model pipelines and providing insights for strategic decision-making across operational and commercial areas.

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What qualifications are needed to become a Senior Data Scientist at Relay?

To qualify for the Senior Data Scientist position at Relay, candidates should have at least 6 years of experience in data science, demonstrating a successful track record in delivering production-ready models. Strong proficiency in Python and SQL is essential, alongside a solid understanding of statistics and probability applied in operational contexts. Excellent communication skills for explaining technical results to non-technical audiences and the ability to navigate complex data are also crucial.

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What tools and technologies does a Senior Data Scientist at Relay work with?

The Senior Data Scientist role at Relay involves utilizing smart tooling and automation in conjunction with AI to create actionable insights from complex data sets. The position also requires deep familiarity with Python, SQL, and various statistical tools, as well as experience with geospatial data and forecasting models. Collaboration with teams across functions will often lead to using Microsoft Excel or Google Sheets for financial modeling.

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What kind of work culture can a Senior Data Scientist expect at Relay?

At Relay, the work culture is one of learning, ownership, and teamwork. As a Senior Data Scientist, you'll be encouraged to take initiatives from day one, engage in team socials, and participate in exciting events that foster camaraderie. The company values flexibility and offers hybrid working options, ensuring you can maintain a healthy work-life balance while contributing to meaningful projects.

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What benefits come with the Senior Data Scientist position at Relay?

Relay offers a competitive benefits package for the Senior Data Scientist role, including 25 days of annual leave, an equity package, and comprehensive health insurance through Bupa Global. Additional perks include a contributory pension scheme, hybrid working arrangements, free gym membership at the co-working space in London, and a cycle-to-work scheme. This is in addition to a supportive workplace culture that prioritizes employee growth and development.

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Common Interview Questions for Senior Data Scientist - Middle Mile & Pitstops
How do you approach the optimization of a logistics network?

When optimizing a logistics network, I begin by analyzing existing data to identify inefficiencies or bottlenecks. By developing predictive models using Python and SQL, I assess various scenarios and their potential impacts. It's also vital to collaborate with cross-functional teams to ensure that optimizations align with broader business goals and operational strategies.

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Can you explain your experience with predictive modeling?

In my previous roles, I frequently used predictive modeling to forecast demand and optimize supply chain operations. I focused on employing regression techniques and machine learning algorithms to analyze historical data, which allowed us to anticipate trends and inform strategic decisions. Communication with stakeholders was key in ensuring these models were actionable and relevant.

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What challenges have you faced when working with messy data?

Working with messy data is a common challenge in data science. I approach this by first assessing data quality and identifying any gaps or inconsistencies. Techniques such as data cleaning, transformation, and even implementing robust data pipelines help improve data integrity. Ensuring I maintain communication with my team helps align on the right approaches to clean and utilize this data effectively.

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Describe a successful project you've worked on related to operational efficiency.

In one successful project, I led a team in enhancing the delivery efficiency of a logistics network. By developing a multi-variable model that assessed route performance, vehicle utilization, and customer feedback, we identified key areas for improvement. Implementing data-driven changes led to a 20% reduction in delivery times, significantly enhancing customer satisfaction.

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How do you communicate complex data results to non-technical stakeholders?

My strategy for communicating complex data results involves simplifying technical jargon and focusing on actionable insights. I often use visualizations to illustrate key points, ensuring that stakeholders can grasp the findings quickly. It's all about framing the data in a way that highlights its relevance to their objectives, making them more likely to understand and use the insights effectively.

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What is your experience with financial modeling in data science?

Financial modeling has been an integral part of my work, particularly in assessing the viability of new projects. I create detailed financial models to forecast revenues and expenses, which allow for evaluating potential risks and returns. Collaborating with finance teams helps ensure these models are accurate and aligned with overall business strategies.

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Can you describe your experience working with geospatial data?

I've worked with geospatial data in optimizing delivery routes and sites for new distribution points. By analyzing geographic patterns and customer density, I used GIS tools to visualize data, which informed the strategic placement of resources. This analysis played a vital role in cutting costs and improving service levels in logistics operations.

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HowDo you ensure your models are ready for production?

To ensure models are ready for production, I follow a rigorous testing and validation process. This includes setting aside test datasets to evaluate model accuracy and performance. Additionally, I collaborate closely with MLE teams to automate deployment, ensuring that our models can be integrated seamlessly into existing systems with minimal disruption.

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What strategies do you use to prioritize tasks in a fast-paced environment?

In a fast-paced environment, I prioritize tasks based on business impact and urgency. I use project management tools to visualize workflows and deadlines, allowing me to allocate resources effectively. Regular check-ins with team members also help ensure we're aligned on priorities and adapting to changes swiftly when necessary.

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What attracted you to the Senior Data Scientist position at Relay?

I am drawn to Relay because of its commitment to sustainability and innovation in the logistics space. The opportunity to apply data science in a meaningful way that directly impacts the community and environment excites me. Moreover, the collaborative culture and focus on personal growth resonate with my professional values, making Relay an ideal fit for my skills and aspirations.

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DATE POSTED
March 25, 2025

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