Location
London, United Kingdom

Type
Full Time

Salary (£)
Not disclosed

About Ravelin
Ravelin is a fraud detection company on a mission to make online transactions safer for everyone. They build powerful machine learning systems that help businesses prevent fraud before it hits. Their technology protects some of the world’s biggest online brands, and they do it while keeping empathy, ambition, unity, and integrity at the heart of everything they do.

They’ve built a place where smart, curious people can work together without unnecessary hierarchy. They value balance, fun, and genuine collaboration. Join them and you’ll be surrounded by people who want to make a difference, share ideas freely, and enjoy what they do.

Job details

Benefits

  • Flexible working hours: Choose when and where you’re most productive in a remote-first environment
  • BUPA Health Insurance: Comprehensive coverage that keeps you and your family secure
  • £1,000 annual wellness and learning budget: Invest in your personal growth and well-being
  • Monthly wellbeing and learning day: Take the last Friday off each month to recharge or learn
  • 25 days holiday plus bank holidays and an extra cultural day: Plenty of time to rest and celebrate
  • Mental health support via Spill: Access confidential mental health services whenever needed
  • Aviva pension scheme: Plan for your long-term financial security
  • Ravelin Gives Back: Get involved in charitable projects and community initiatives
  • Randomised team lunches: Meet teammates across the company through fortnightly lunches
  • Cycle-to-work scheme: Stay active and save money on your commute
  • Weekly board game nights and socials: Unwind and connect with colleagues in a relaxed setting
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Requirements

  • Around 1 year of experience building and deploying ML models with Python (numpy, pandas, sklearn)
  • Strong analytical mindset and an eye for detail
  • Excellent communicator able to explain complex ideas clearly
  • Comfortable working collaboratively across teams and disciplines
  • Organised and adaptable with a problem-solving attitude
  • Confident working in a hybrid setup with a global team

Salary Details

Salary will be competitive and reflect experience, with added benefits for personal development and well-being.

About the Role

As a Junior Data Scientist at Ravelin, you’ll help train, deploy, and evaluate models that stop fraud in its tracks. You’ll learn from some of the best minds in data science while working on real-time prediction systems that make a tangible impact.

Your job is part detective work, part engineering. You’ll build robust models that adapt to new fraud patterns, ensuring clients stay ahead of evolving threats. You’ll also help improve the infrastructure behind these systems, making model deployments faster and more reliable.

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Expect to collaborate closely with engineers, investigators, and client teams. Every model you deploy helps protect global businesses from millions in potential losses, which means your work truly matters.

Key Responsibilities

  • Train and deploy ML models to detect fraud efficiently and accurately
  • Enhance model evaluation systems to ensure predictions remain consistent and trustworthy
  • Write and maintain production features that support scalable fraud detection
  • Investigate model performance to uncover issues and optimise results
  • Research new techniques to counter evolving fraud tactics and improve client safety
  • Collaborate with cross-functional teams to align data science with client success goals

Disclosure and Barring Service Check

Job offers may be withdrawn if candidates do not meet pre-employment checks, including unspent criminal convictions, employment verification, and right to work.

From 6 April 2017, Skilled Worker applicants applying for entry clearance into the UK have had to present a criminal record certificate from each country they have resided continuously or cumulatively for 12 months or more in the past 10 years. Adult dependants (over 18 years old) are also subject to this requirement. Guidance can be found on the UK Government website under Criminal records checks for overseas applicants.

Equal Opportunity Statement

Ravelin is an equal opportunity employer that values diversity. They encourage applicants from all backgrounds and create an environment where everyone can thrive.

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Employer Details

  • Company Name: Ravelin
  • Address: London, United Kingdom
  • Contact: Recruitment Team

How To Apply
Think you’ve got what it takes to outsmart fraudsters and grow your career in data science? Apply Now and start building technology that protects millions worldwide.


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