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.

• Technical implementation of the company's new projects in terms of card processing
• Selection, planning, and coordination of architectural solutions, technology stack
• Setting up and installing authorization system releases
• Passing certification tests, audits of payment networks
• Study of specifications, norms, and rules of payment networks.
• Lead the resolution of client problems alongside team members.
• Actively participate in customer go-live activities and pilot phases.
• Preparation of technical requirements for system upgrades
• Setting up emulators of payment systems 

Core Payment Expertise

• 3+ years of experience in card processing systems, with solid understanding of the full payment lifecycle (authorization, clearing, settlement)
• Experience with card processing platforms (BPC SmartVista is a strong advantage)
• Strong knowledge of payment industry standards and protocols (ISO8583, SOAP, REST APIs)
• Familiarity with modern payment technologies such as EMV 3-D Secure, recurring payments, Apple Pay, Google Pay, VTS, AVS

• Strong understanding of the regulatory framework and operational rules of major payment systems and European regulators, including PCI DSS, PSD2, ATNGE, Liability Shift, etc.
• Skilled in maintaining technical documentation and producing structured, clear system documentation.
• Experience in planning and reporting activities related to payment processing.
• Background in budgeting for payment infrastructure and project needs.
• Hands-on experience with international and local payment systems: JCB, Discover (DCI), American Express (AmEx)
• In-depth knowledge of clearing and settlement exchanges with card schemes, including MasterCard File Express, Edit Package, and related tools

• Attractive monthly salary paid in line with experience
• Vacation, sick, and paid holidays
• Flexible working hours
• Full-time: 5/2
• Modern workplace with all necessary equipment
• A team of top international professionals to learn from
• Multicultural working environment

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.