Oleksii Zaretskyi

• Company Overview: https://rubean.com.
• Developing, certifying, introducing to the market, supporting, and adapting for individual customer requirements: PhonePOS - a smartphone contactless payment acceptance solution.
• Implementing card readers (mPOS terminals) as a pure software (SoftPOS) app that runs on practically any NFC-enabled device for accepting contactless card payments.
• Developing and supporting the variety of back-end systems for the PhonePOS client application/SDK: onboarding system, attestation and monitoring service, activation/personalization service, payment gateway, and acquiring processors, PSPs, and NSPs integrations.
• 20K+ live terminals, 24/7 transaction processing, and 20+ acquirers and payment processors integrated.

Technology stack:

• Payment Core/PinPad: C++;
• Backend services: Kubernetes-native Java stacks, Micronaut, Quarkus, Spring Boot
• APK/SDK - Kotlin
• Message Queues - Kafka
• Database - MS SQL (Payment gateway); MongoDB (backend services).

• Company Overview: https://epay.de/en.
• Building and supporting Transact POS, e-commerce PSP, and acquiring systems with digital onboarding to connect consumers to the company's payment platforms.
• Building and supporting the company's EMV 3DS solution, including 3DS exemptions.
• Launching card-on-file, recurring, merchant-initiated, and tokenization programs.

• PSD 2/3DS 2+ (EMV 3DS) development (e-come 3DS 2 and POS single tap indicator) and migration - the company's key subject matter expert.
• Tokenization and COF programs launch, including industry frameworks, subject matter expert.
• P2P Payments and Funds Disbursement programs launch - key subject matter expert.
• Merchant portfolio migration to in-house and partner PSPs (where the company served as the acquiring entity) - key subject matter expert.
• Billing systems migration to a new platform: key subject matter expert.
• PSP and acquiring merchant onboarding process - subject matter expert.
• Card schemes, market mandates, regulations, and compliance projects - key subject matter expert.

Technology Stack:

• Payment Back End - C++
• Database - Oracle, PL/SQL.

• Company Overview: www.luxoft.com.
• Development and support of the risk management platform used for calculating the bank's counterparty risk exposure (CVA) and allowing this to be hedged. The system consumes trades and market data from systems all over the bank and all asset classes, then runs a series of complex risk calculations across the entire trade portfolio, and provides feeds to downstream systems of the results.
• Large volumes of incoming data and extremely large-scale calculations are distributed across a compute grid of a few thousand CPUs.

Technology stack:

• Back End - .Net/C#, WCF, Data Synapse GRID, Database - Oracle, MS SQL Analysis Service.
• Database: Oracle, MS SQL Analysis Services.

• The company was separated from Incom - my previous employer
• Key project was My Kyivstar Self-Care System – an online self-care system based on the Oracle e-Billing solution for the clients of Kyivstar, Ukraine's largest mobile operator and internet provider. My Kyivstar made the process of servicing subscribers more efficient and comfortable. Number of active users at the time: 25K+

Technology Stack:

• J2SE, J2EE, JS, AngularJS, Oracle, Oracle DWH.

• Key project was My Kyivstar Self-Care System – an online self-care system based on the Oracle e-Billing solution for the clients of Kyivstar, Ukraine's largest mobile operator and internet provider. My Kyivstar made the process of servicing subscribers more efficient and comfortable. Number of active users at the time: 25K+

Technology Stack:

• J2SE, J2EE, JS, AngularJS, Oracle, Oracle DWH.