Data Scientist

Yoyo Wallet, London

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About Yoyo

We launched the company in 2014 at Imperial College, London and since then have gone on to become one of the best known and best funded companies in FinTech. Our apps are used over 2 million times a month, making us Europe’s most used mobile wallet. We are creating the most advanced technology in payment, loyalty and marketing for retailers, based on our unique ability to match a customer to their basket data. Recent industry initiatives like Open Banking and PSD2 have really caught our sails and we are gearing for massive growth. We are intent on delivering real value and we want you to join our team.

The Yoyo Wallet product comprises of iOS and Android apps that talk to a suite of APIs powered by the Yoyo platform. We use a service-oriented architecture to support real-time, high-volume transactions that consistently deliver sub-one-second response times at the point-of-sale.

The Role

We are building a data-driven marketing platform that enables Retailers to deliver engaging campaigns to their customers via our web-based dashboard, Yoyo Engage. You will join a small product-engineering team that has the autonomy to shape its development.

Our technology stack includes (but is not limited to)

  • Python and Django framework to write our application logic
  • PostgreSQL for relational database
  • DynamoDB for NoSQL
  • Terraform for managing our cloud infrastructure
  • Docker and AWS EC2 Container Service (ECS) for packaging and running our services
  • AWS for hosting our infrastructure
  • RabbitMQ and Celery for message queue
  • CircleCI and ChatOps for continuous deployment
  • Ansible and Fabric for automating workflows
  • ReactJS for internal dashboard


  • Collecting, processing, cleansing and verifying the integrity of data used for analysis
  • Selecting features, building and optimising classifiers using machine learning techniques and frameworks
  • Find useful insights and hidden patterns mining data using scalable techniques
  • Performing ad-hoc analysis and presenting the results in a clear and concise manner
  • Creating anomaly detection systems and constant tracking of its performance


  • Good understanding of machine learning techniques and algorithms, such as k-NN, Naive Bayes, SVM and decision trees
  • Experience with common data science tools and frameworks, such as Python, NumPy, scikit-learn, MatLab, Tableau
  • Experience with data visualisation tools such as D3.js, plotly.js, matplotlib
  • Great communications skills
  • Proficient in using Structured Query Language (SQL)
  • Good scripting and programming skills

What you get in return

Working as part of an early stages company is challenging. It’s not all ping pong tables and free beer…..well sometimes it is! What you are willing to put into growing the company will determine not only our success, but yours too. If you are ready for this challenge then we promise:

  • Competitive salary with health insurance and pension scheme
  • All the equipment necessary to make sure you are able to do your role
  • Monthly Yoyo spend reimbursed to your bank account
  • Work in a collaborative, flexible, open-minded and flat organisation
  • Work on challenging real-world problems that you can take ownership of
  • Build something today and see it in people’s hands tomorrow
  • Great central London location and an awesome team!


We are an equal opportunity employer and value diversity at our company. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status.

About Yoyo Wallet

Who we are Yoyo is the fastest growing mobile wallet in Europe. As a consumer, that means you can use Yoyo for secure mobile payment, automated loyalty and digital receipt collection whilst also receiving offers personalised to what you buy along and using wider functions like pre-ordering. Put simply, we’re taking technological advancements and revolutionising the brick and mortar retail experience for retailers and their customers. Now in its 4th year you can use Yoyo across high streets, universities and corporate locations.

Want to learn more about Yoyo Wallet? Visit Yoyo Wallet's website.