What the job involves

• You will be joining the Detection team
• The Detection team is responsible for keeping fraud rates low – and clients happy – by continuously training and deploying machine learning models
• We aim to make model deployments as easy and error free as code deployments
• Google’s Best Practices for ML Engineering is our bible
• Our models are trained to spot multiple types of fraud, using a variety of data sources and techniques in real time
• The prediction pipelines are under strict SLAs, every prediction must be returned in under 300ms
• When models are not performing as expected, it’s down to the Detection team to investigate why
• The Detection team is core to Ravelin’s success
• They work closely with the Data Engineering Team who build infrastructure and the Intelligence & Investigations Team who liaise with clients
• We are currently looking for a Data Scientist to help train, deploy, debug and evaluate our fraud detection models
• Our ideal candidate is pragmatic, approachable and filled with knowledge tempered by past failures
• Evaluating fraud models is hard; often times we do not even get labels for 3 months
• You’ll need to use your judgement when investigating cases of ambiguous fraud and when you’re investigating the veracity of the model itself
• We have to build robust models that are capable of updating their beliefs when they encounter new methods of fraud: our clients expect us to be one step ahead of fraud, not behind
• You will be given the equipment, space and guidance you need to build world class fraud detection models
• The work is not all green field research
• The everyday work is about making safe incremental progress towards better models for our clients
• The ideal candidate is willing to get involved in both aspects of the job – and understand why both are important
• Build out our model evaluation and training infrastructure
• Develop and deploy new models to detect fraud whilst maintaining SLAs
• Write new features in our production infrastructure
• Research new techniques to disrupt fraudulent behaviour
• Investigate model performance issues (using your experience of debugging models)
• Mentor junior members of the team

Benefits

• Remote first - it’s up to you whether you come in to the office or work from home, and we also support Ravelinos who work internationally, on a temporary or permanent basis, through our partner Omnipresent
• Mental health support - we’ve partnered with Spill to provide round the clock access to therapists, we offer a 24/7 employee assistance programme through AXA, and we also book wellbeing days into everyone’s calendar each quarter
• Charity - we make monthly donations to various causes, and our Ravelinos are able to nominate charities through our Ravelin Gives Back initiative
• Volunteering - we organise in-person volunteering opportunities throughout the year
• Flexible hours
• Employer-contributed pension scheme
• Equity scheme
• Lunches twice a month and the office kitchen cupboards are stocked with treats and goodies on a weekly basis
• Home office budget
• One day each quarter dedicated to learning and personal development
• Individual yearly learning budget of £1000, and access to company wide training
• Comprehensive medical cover through AXA or US equivalents, including dental and optical cash back
• Remote fitness - virtual yoga twice a week, team HIIT sessions, and online Pilates class
• Socials - we do our best to include everyone in our social activities, whether you work remotely or you’re always in the office, and anyone at Ravelin can organise a social!