Senior Software Developer - Fraud Risk

About the role

Wise is hiring a Senior Software Developer for its Fraud Risk team in Tallinn. The team builds fast, accurate, real-time risk decisions on transfers and customer profiles, using data, automation and AI-driven signals to prevent fraud and scams. You will own the technical direction of key prevention projects and mentor engineers.

Key responsibilities

• Build systems that prevent fraud and scams through real-time transfer and profile decisioning
• Own the technical roadmap and deliverables of key projects in the prevention domain
• Drive improvements in latency, reliability and decision quality across the decisioning platform
• Address technical debt, keep risk within appetite and enforce engineering best practices (observability, security, Kafka/DB usage, testing)
• Mentor engineers, share knowledge, lead onboarding and interview future talent
• Contribute to guilds and cross-team engineering efforts to reduce duplicated work

Required profile

• Strong experience building and operating production systems on Java/JVM, with expert knowledge of your technical discipline
• Track record of owning the technical direction of large projects, from design and RFCs through delivery and operation
• Experience designing systems with long-term iteration and scaling in mind, documented API-first interfaces, and a proactive approach to technical debt
• Accountability for reliability, security and observability, including incident resolution and post-incident reviews
• Ability to explain the purpose and expected impact of work and give feedback on the product roadmap
• Experience mentoring engineers through code reviews, design discussions and best practices
• Excellent communication across Product, Data Science, Fraud Operations and Analytics

Required skills

• Java/JVM
• Distributed systems and event-driven architectures (Kafka or similar)
• Nice to have: Python, machine learning concepts, deploying models in production, or large language models in production