Backend Engineer (Java/Kotlin)

TL;DR

Backend Engineer (Java/Kotlin): Designing and implementing scalable, resilient backend services for an AI-powered identity verification platform with an accent on API design, high availability, and fraud detection systems. Focus on architecting large-scale graph-based systems, optimizing database performance, and integrating ML models into production.

Location: Must be based in Spain

Company

hirify.global is a Series B unicorn providing AI-powered identity verification and fraud prevention solutions for leading global banks, fintechs, and governments.

What you will do

• Architect and implement robust, scalable backend systems supporting millions of active users.
• Build and maintain services across the entire lifecycle, from initial model design to production support.
• Solve complex engineering challenges, including designing large-scale graph-based systems and managing data migrations.
• Implement observability practices, including logging, monitoring, and tracing, to ensure system health.
• Collaborate with ML and DevOps teams to bring fraud detection models into production.
• Maintain high code quality through clean code practices and rigorous peer code reviews.

Requirements

• 5+ years of professional software development experience.
• Proficiency in Java/Kotlin and the Spring framework ecosystem.
• Strong understanding of PostgreSQL, MongoDB, and Redis.
• Hands-on experience in domain modeling and REST API design.
• Experience with observability tools for logging, monitoring, and tracing.
• Location: Must be based in Spain

Nice to have

• Experience with AWS cloud services and Kubernetes for orchestration.
• Familiarity with Kafka for messaging and event-driven architectures.
• Experience with graph databases (Neo4j, Memgraph, Amazon Neptune) or columnar databases (ClickHouse, Apache Cassandra).
• Exposure to machine learning-centric systems.

Culture & Benefits

• Flexible working hours and workplace.
• Open vacation policy.
• High-performance culture based on freedom, responsibility, and continuous feedback.
• Opportunity to work in a unicorn-status scale-up with a truly global team.