Senior Software Engineer II - Fraud Squad

Wise; Greater London; On-site; GBP 66,000 - 106,000; Full time

Job summary

Wise in London is seeking a Senior Software Engineer for our Account Integrity team. Join a mission-critical function protecting customers and building secure financial crime prevention systems.

You will tackle complex adversarial problems, own end-to-end features, and contribute on the backend (80%) and frontend (20%) using Java, Spring, and modern CI/CD practices in a globally distributed engineering environment.

Qualifications

• Professional experience with Java or other JVM-based languages, including the Spring framework.
• Proven experience designing and operating CI/CD pipelines, distributed systems, and concurrent systems.
• Strong product mindset, accountability, and the ability to drive projects independently while making data-driven decisions with the customer in mind.
• Experience with relational and non-relational databases, including query optimisation and designing resilient schemas.
• Exceptional fundamentals, sharp problem-solving ability, and a commitment to Test Driven Development and best coding practices.
• Excellent communication skills to articulate complex technical concepts across teams including Product, Data Science, and Investigations.
• Familiarity with the machine learning lifecycle, including data pipelines, feature engineering, and deploying ML systems into production is a plus.

Responsibilities

• Join our Senior Software Engineer team in our critical Account Integrity function.
• Solve complex, real-world adversarial problems to help protect our global customer base.
• Continuously improve our financial crime prevention infrastructure and systems.
• Take end-to-end ownership of projects focused on building and refining critical controls to protect customer accounts from account takeovers.
• Drive backend and frontend development for our crime prevention and detection systems, spending around 80% of the time on backend work and 20% on frontend work.
• Deliver tangible impact by securing customer money, raising automation levels, and helping us engineer a world-class money transfer product.

Skills

Java

Spring

CI/CD

Distributed systems

TDD

Databases

Databases (NoSQL/SQL)

Problem solving

Communication

Tools

JVM

CI/CD pipelines

Frontend

Machine Learning

Security

Network

Job description

Salary: £66,000 - 106,000 per year

Requirements

• Professional experience with Java or other JVM-based languages, including the Spring framework.
• Proven experience designing and operating CI/CD pipelines, distributed systems, and concurrent systems.
• Strong product mindset, accountability, and the ability to drive projects independently while making data-driven decisions with the customer in mind.
• Experience with relational and non-relational databases, including query optimisation and designing resilient schemas.
• Exceptional fundamentals, sharp problem-solving ability, and a commitment to Test Driven Development and best coding practices.
• Excellent communication skills to articulate complex technical concepts across teams including Product, Data Science, and Investigations.
• Familiarity with the machine learning lifecycle, including data pipelines, feature engineering, and deploying ML systems into production is a plus.

Responsibilities

• Join our Senior Software Engineer team in our critical Account Integrity function.
• Solve complex, real-world adversarial problems to help protect our global customer base.
• Continuously improve our financial crime prevention infrastructure and systems.
• Take end-to-end ownership of projects focused on building and refining critical controls to protect customer accounts from account takeovers.
• Drive backend and frontend development for our crime prevention and detection systems, spending around 80% of the time on backend work and 20% on frontend work.
• Deliver tangible impact by securing customer money, raising automation levels, and helping us engineer a world-class money transfer product.

Technologies

• Backend
• CI/CD
• Frontend
• Support
• JVM
• Java
• Machine Learning
• Spring
• TDD
• Network
• Security

More

We are Wise, a global technology company building the best way to move and manage the worlds money. Our mission is to make international payments faster, easier, and cheaper for people and businesses everywhere. This is a full-time Engineering role at mid-senior level based in London, within our Account Integrity team. We work on safeguarding our platform against sophisticated financial crime using machine learning, real-time transaction monitoring, and advanced data analysis. We offer a high-impact, product-focused environment where you can help protect customers, support our global mission, and work within a diverse, equitable, and inclusive international team.

last updated 36 week of 2026