Backend engineer- PL/SQL

About the Role Join Paysend’s Consumer Platform team and help build the next generation of a global payments platform. This role focuses on developing and improving backend systems that power payment flows, compliance processes, fraud tooling, and large-scale financial operations. As part of an ongoing migration from a legacy Oracle + Java platform, you’ll work on modernizing core services and building new platform capabilities used across the business. The platform is built around PL/pgSQL and PostgreSQL , which power core business workflows and transactional processing, while backend services in Java, Kotlin and C# to support integrations and external processing. You’ll work on complex backend and data challenges involving high transaction volumes, strict consistency requirements, asynchronous workflows, and distributed systems, with a strong focus on reliability, correctness, and performance. This role is best suited for engineers who enjoy deeply technical backend work, strong database engineering, and solving complex system problems under real operational scale. What You'll Do (Responsibilities) Design and implement technical solutions across payment flows, compliance tooling, fraud scenarios, and platform migrations Develop and maintain PL/pgSQL-based business logic, process workers, and migration scripts Own and evolve PostgreSQL-based data models, queries, and performance optimization across multiple services Work within a microservices ecosystem, handling service communication, dependencies, and asynchronous workflows Build and improve external job handlers and integrations using Java, Kotlin, or C# Develop migration pipelines and data-processing workflows as part of the transition from the legacy Oracle platform Ensure transactional correctness, reliability, and consistency across high-volume financial operations Monitor and improve system performance, observability, scalability, and operational reliability What You’ll Need To Be Successful In This Role Strong hands-on experience with PL/pgSQL in production environments (this is a core part of the platform architecture) Experience writing and debugging stored procedures, process workers, and migration scripts Experience with Java, Kotlin, or C# for backend services and integrations Strong PostgreSQL knowledge, including transaction semantics, JSONB, partitioning, and query optimization Experience working with distributed systems and microservices architectures Strong understanding of data consistency, transactions, and financial correctness Ability to write and maintain SQL-based tests Working knowledge of CI/CD pipelines and modern development workflows Great to Have Experience in fintech, payments, compliance, fraud prevention, or other transaction-heavy systems Experience with RabbitMQ, Kafka, or asynchronous messaging systems Experience with GitLab CI/CD pipelines Familiarity with Docker and containerized environments Experience working with large-scale data migrations or legacy platform modernization projects Why Join Paysend? Make a Global Impact: Directly impact millions of users worldwide Accelerate Your Career: Benefit from internal mobility, mentoring programs, and continuous learning opportunities Thrive in a Connected, Global Organization: Collaborate with colleagues across our international hubs and more Embrace a Principle-Driven & Focused Culture: Work in an organization guided by strong principles and values that actually help you achieve more than you thought possible Enjoy Competitive Compensation and Benefits: Receive a competitive salary, benefits, and flexible work arrangements