Java Developer - Fraud Engineering (all genders)

BestSecret Group; Málaga; Hybrid; EUR 60,000 - 90,000; Full time

Benefits offered by this job

Employee discount on platform

Private healthcare (tax-free) with the

Hybrid work model (1–2 days per week)

Flexible working hours with core hours

Tech Friday learning day

Summer hours

Job summary

BESTSECRET is seeking a skilled Backend Engineer to develop and maintain our core fraud detection service, a Java and Spring Boot application central to our risk architecture. You will own features from design through deployment and support, influence architectural decisions, and help advance our fraud prevention capabilities.

You will work closely with analytics, operations, and business stakeholders, ensuring scalable, observable, and performant production systems while contributing to

Qualifications

• Several years of experience building backend services with Java 17 or later.
• Strong hands-on experience with Spring Boot and the broader Spring ecosystem.
• Experience designing REST APIs and working with relational databases and SQL.
• Commitment to software quality with unit and integration testing.
• Experience with Git, CI/CD, containers, and regular production deployments.
• Experience operating production services with logs and metrics.
• Interest in understanding data and business context behind requirements.
• Professional working proficiency in English.

Responsibilities

• Design, build, and maintain Java/Spring Boot services and APIs for fraud detection and risk scoring.
• Translate rules, signals, and requirements into reliable, observable production solutions.
• Build and improve internal tooling for reviewing cases and managing rules.
• Integrate services with internal platforms and third-party risk providers.
• Maintain production reliability via monitoring, alerting, and performance optimization.
• Collaborate with analytics, operations, and business stakeholders to understand data and processes.
• Review code, contribute to architecture, and mentor colleagues.
• Identify opportunities to improve services and fraud prevention capabilities.

Skills

Java 17+

Spring Boot

REST APIs

SQL

Unit & integration testing

CI/CD

Docker/Kubernetes

Monitoring & logging

English proficiency

Tools

Git

CI/CD pipelines

Cloud platforms (Azure)

Job description

BESTSECRET is the leading European online destination for premium and luxury off‑price fashion. The Group offers its members in 28 countries across Europe a superior brand portfolio complemented by a high‑end shopping experience. At the same time, BESTSECRET enables its brand partners to clear overstock at scale with minimum visibility and maximum brand equity protection. The unique business model is based on its closed character with an invitation‑only customer membership, longstanding brand partner and customer relationships, combined with a tech‑focused mindset. BESTSECRET has a strong track record of profitable growth over many years. It generated revenues of EUR 1,533.7 million in 2025 and employs around 2,200 people from over 90 nations. The Group draws on a heritage of 100 years in the textile and fashion industry and today is owned by Permira Funds and the founding families Schustermann and Borenstein.

About The Team

Fraud Engineering develops technology and internal capabilities that support fraud detection and prevention across our e‑commerce business. Our work includes services that generate risk scores and assessments, as well as tooling that helps teams review cases, manage fraud signals, and respond to emerging risks. We work closely with analytics, operational, and business stakeholders, giving engineers valuable insight into how technical decisions perform in practice. This connection between engineering, data, and real‑world outcomes makes the work both technically challenging and highly relevant to the business.

The Role

You will develop and maintain our core fraud detection service, a Java and Spring Boot application at the center of our fraud technology landscape. This is a hands‑on role in which you will take responsibility for features from technical design and implementation through deployment and production support. You will also contribute to architectural decisions, engineering standards, and the continued development of our technical capabilities.

What You’ll Do

• Design, build, and maintain Java and Spring Boot services and APIs that support risk scoring and fraud assessments.
• Translate fraud rules, signals, and business requirements into reliable, observable, and performant production solutions.
• Build and improve internal tooling used to review cases, manage rules, and act on fraud alerts.
• Integrate our services with internal platforms and third‑party risk providers.
• Help maintain the reliability of our production services through monitoring, alerting, and performance optimization.
• Collaborate with analytics, operational, and business stakeholders to understand the data and processes behind the technical requirements.
• Review code, contribute to technical and architectural decisions, and support the development of colleagues through knowledge sharing and mentoring.
• Identify opportunities to improve our services, engineering practices, and fraud prevention capabilities.

What We’re Looking For

Must have

• Several years of experience building backend services with Java 17 or later, with a strong understanding of Java and the JVM.
• Strong hands‑on experience with Spring Boot and the broader Spring ecosystem.
• Experience designing REST APIs and working with relational databases and SQL.
• A strong approach to software quality, including unit and integration testing as part of the development process.
• Experience with Git, CI/CD, containers, and regular production deployments.
• Experience operating production services, including working with logs and metrics and investigating production issues.
• An interest in understanding the data and business context behind technical requirements, rather than focusing only on individual development tasks.
• Professional working proficiency in English, which is our working language.

Nice to have

• Experience in fraud prevention, risk, payments, or e‑commerce.
• Experience with event‑driven architectures and messaging technologies such as Kafka.
• Experience with rules or decision engines, or with integrating analytical or machine learning models into production systems.
• Experience with cloud platforms such as Azure.
• Experience with Kubernetes and infrastructure as code.
• Confidence working with data, including advanced SQL, data pipelines, or analytics tooling.

Our Benefits

• Employee discount on our platform
• Access to a corporate benefits platform with discounts on travel, hotels, electronics, and more
• Private healthcare (tax‑free), with the option to include your family
• 30 days of paid vacation per year plus local bank holidays
• Hybrid work model (1–2 days per week in the office in Málaga)
• Flexible working hours with core collaboration time (10:00 – 16:00)
• Tailored development opportunities, including “TechFriday” – a monthly day dedicated to learning and innovation
• Reduced working hours in August (summer schedule)

At BESTSECRET, diversity isn't just a trend – it's our professional philosophy. We are dedicated to cultivating an inclusive workplace where everyone's unique talents and backgrounds are celebrated. Applicants from all backgrounds, experiences and perspectives are welcome to join us in our mission towards a more vibrant and inclusive future.