Oleksii Z.

I am a senior EMV L3 certification and payment integration consultant with 10+ years of hands-on experience in POS, SoftPOS and ATM solutions. I have delivered 50+ successful Visa, Mastercard MTIP, JCB, Amex and UnionPay certifications for POS/ATM vendors, acquiring banks and processors across Europe, the Middle East and Asia. My core expertise includes: • EMV Level 3 certification (Retail & Cash) • POS, SoftPOS (CPoC / MPoC) and ATM integrations • ISO8583 transaction flows and payment debugging • Processor-side integrations (Tieto, CompassPlus, Way4, SmartVista, UPC, MADA and D8-based processors) • UL / FIME certification labs and scheme simulators I regularly work with product and engineering teams at the stages where certification, scheme compliance or complex payment issues need to be resolved efficiently. Available for contract, consulting or full-time engagements. Remote.