Processing Development Engineer
About Unlimit
Unlimit is a global fintech ecosystem built to eliminate financial borders holding businesses back. The company provides the extensive infrastructure needed to scale globally, integrating payment processing, multi-currency business accounts, BaaS and crypto gateways into a single, intelligent platform.
Across 17 offices globally, Unlimit bridges hyper-local expertise with a high-capacity financial network, giving companies the agility to expand across regions with operational confidence and speed. Driving the evolution of payments, Unlimit is transforming its infrastructure from human-operated fintech into AI-native financial infrastructure — where APIs are consumed by machines, integrations are negotiated by agents, and systems evolve continuously through intelligent automation. Our next users are not only humans. They are AI agents acting on behalf of humans and businesses.
Unlimit serves more than the needs of businesses today; we are building the nervous system for a borderless global economy.
As part of our dynamic growth, we are seeking a talented and proactive Processing Development Engineer to join our team within the payment industry. The successful candidate will play a crucial role in maintaining the smooth operation of our Processing Platform (SmartVista) and providing expert technical development of our card products. If you have a solid background in payment processing, technical troubleshooting, we encourage you to apply.
The vacancy expects working from one of the offices: Belgrade or Limassol.
Responsibilities:
Requirements:
Core Payment Expertise
Card Schemes & Certification
Hands-on experience working with Card Schemes (Visa, Mastercard, etc.)
Strong understanding of scheme rules, documentation, and compliance requirements
Experience in card product certification and working with tools such as Visa Edit Package, MasterCard File Express, and scheme emulators
Technical Skills
Practical experience with SQL/PLSQL, Bash, Postman, and Python
Ability to troubleshoot, analyze, and resolve issues in high-load payment environments
Experience with system integrations and API-based architectures
Infrastructure & Systems Knowledge
Experience with system releases, updates, and production support with minimal downtime
Familiarity with card technologies such as EMV, PayWave, magnetic stripe cards, HSM
and OBKM
Additional Skills
Experience in fraud/risk-related processes and transaction monitoring is a plus
Ability to work in cross-functional teams and communicate with technical and business stakeholders
Strong analytical thinking and attention to detail
Will consider as a plus:
We offer:
Join Unlimit Team now!
Unlimit is an equal opportunity employer. We believe passionately that employing a diverse workforce is central to our success. We make recruiting decisions based on your experience and skills. We welcome applications from all members of society irrespective of age, sex, disability, sexual orientation, race, religion or belief.