Backend Engineer (PL/SQL)

TL;DR

Backend Engineer (PL/SQL/PostgreSQL): Building and improving backend systems for a global payments platform with an accent on payment flows, compliance processes, and fraud tooling. Focus on modernizing core services through the migration from Oracle to PostgreSQL and optimizing high-volume transactional processing.

Location: Hybrid (Belgrade, Serbia)

Company

A global digital payment network enabling instant cross-border money transfers in over 170 countries.

What you will do

• Design and implement technical solutions for payment flows, compliance, and fraud scenarios.
• Develop and maintain PL/pgSQL business logic, process workers, and migration scripts.
• Optimize PostgreSQL data models and queries for high-volume financial operations.
• Build integrations and external job handlers using Java, Kotlin, or C#.
• Manage data-processing workflows for the migration from legacy Oracle platforms.
• Ensure transactional correctness and system reliability across distributed microservices.

Requirements

• Strong production experience with PL/pgSQL (core requirement).
• Proficiency in Java, Kotlin, or C# for backend services.
• Deep knowledge of PostgreSQL, including JSONB, partitioning, and query optimization.
• Experience with distributed systems and microservices architectures.
• Ability to write SQL-based tests and work with CI/CD pipelines.
• Must be based in Belgrade, Serbia (Hybrid).

Nice to have

• Experience in fintech, payments, or fraud prevention.
• Knowledge of RabbitMQ, Kafka, or asynchronous messaging.
• Experience with Docker and GitLab CI/CD.
• Background in large-scale data migrations.

Culture & Benefits

• Direct impact on millions of global users.
• Internal mobility, mentoring, and continuous learning programs.
• Collaborative environment within an international organization.
• Competitive compensation and flexible work arrangements.