Payment Solution Engineer at Unlimit

Department: Engineering

Setup: On-site
Location: Belgrade, Central Serbia
Type: Full-time
Level: senior
Posted: Jun 30, 2026

Description

Unlimit is hiring a Payments Integration Engineer to own end-to-end central bank and clearing-system integrations for new licensed markets. The role combines project leadership with technical implementation, including regulator and provider coordination, credentials and environment setup, certification testing, production activation, launch planning, and delivery of maintainable integrations. The position uses a payments and fintech technology stack including Java, Spring Boot, ISO 20022, Kafka, AWS, Kubernetes, Terraform, and AI-assisted development tools.

Required Skills

Java/Spring Boot
ISO 20022
Kafka
AWS/Kubernetes
mTLS/PKI
SWIFT/SEPA

Additional Information

Required Previous Experiences: 5+ years in payments, banking, or integration engineering with hands-on ownership of complex integration projects
Direct experience integrating with central banks and/or national clearing and settlement systems
Hands-on familiarity with payment schemes and networks such as SWIFT and SEPA
Strong understanding of payment rails, clearing, and settlement flows
Ability to run a regulated project independently, managing scope, timelines, and regulator communication
Hands-on experience using AI tools, LLMs, AI-assisted development environments, and automation frameworks
Preferred Qualifications: Experience working directly with financial regulators, especially in Europe, Mexico, and Brazil
Familiarity with local schemes such as SEPA, SPEI, and Pix
Prior BaaS or embedded-finance integration experience
Background in payments, banking, or fintech operating across multiple jurisdictions
Translation Company Name: Unlimit

About Unlimit

Unlimit

Global payment processing infrastructure

Unlimit provides global payment processing infrastructure, enabling businesses to accept and process payments through its proprietary network of local and international payment methods.

Who they serve

Unlimit serves eCommerce brands, travel and hospitality brands, game developers and platforms, gaming companies, subscription businesses, transportation and mobility companies, and entertainment businesses.

View full company profile