Alexander Aprelkin

Selected Project Experience
2021 – Present | Corporate Payments / FinTech
Senior Software Engineer – Payment Processing Platform (Issuer Side)
• Development and stabilization of a highly available real-time authorization system in 
live payment processing (24/7 production)
• Processing and routing of international credit card authorization requests
• Forwarding authorization requests to an external issuer-processing platform
• Integration of external payment networks and airline/corporate booking systems
• Investigation and resolution of critical production incidents in live payment traffic
• Root-cause analysis across multiple system boundaries (network, processor, internal 
services)
• Migration of authorization services to a containerized Kubernetes cloud environment
• Development of internal operational and analysis tools for support and operations 
teams
Technologies: Java, Spring Boot, Kafka, TCP/Netty, Docker, Kubernetes, Azure Cloud, 2020 – 2021 | Omnichannel Retail Plattform
Senior Software Engineer – Order-Management-System
• Development of business-critical backend services within a distributed omnichannel 
order-management platform
• Implementation of Available-to-Promise decision logic for real-time order validation
• Integration with enterprise retail systems
• Event-driven communication via Kafka
Technologies: Java, Kotlin, Spring Boot, Kafka, Kubernetes, Docker, GCP, PostgreSQL, 
MongoDB
2019 – 2020 | High-Traffic Digital Plattform
Senior Software Engineer – Publishing Plattform
• Development of a high-traffic online platform with real-time personalized content 
delivery
• Contribution to recommendation and experimentation systems (A/B testing, ML-
supported decisions)
• Processing large volumes of user interaction events through streaming pipelines
Technologies: Java, Python, Kafka, Kubernetes, Docker, AWS, Elasticsearch
2018 – 2019 | FinTech Billing System
Senior Software Engineer – Credit Card Billing
• Development of billing and statement generation service for credit card transactions
• Aggregation and processing of financial data from SAP and CRM systems
• Integration of an output management system for document generation (PDF 
statements)
Technologies: Java, Spring Boot, Kafka, MongoDB, Azure Cloud, Docker 2017 – 2018 | E-Commerce Fulfillment
Senior Software Engineer – Logistics Platform
• Development of cloud-native microservices for automated warehouse and order 
processing
• Synchronization of inventory and order states via event streaming
Technologies: Java, Spring Boot, Kafka, Kubernetes, Docker, MySQL
2017 | Risk & Fraud Analytics (FinTech)
Machine Learning Engineer
• Development of machine-learning approaches for fraud and anomaly detection in 
financial data
• Training and production usage of ML models
Technologies: Python, Java, Machine Learning, PostgreSQL
Earlier Consulting Projects (IT Consulting)
Insurance — Claims Management System
Backend development for customer contact center platform of an international insurance 
provider.
Telecommunications — CRM Migration Systems
Modernization of a Java-based CRM system and preparation of large-scale customer data 
migration.
Telecommunications — Event Processing & Billing
Development of an event-processing system for aggregation and billing of telecom usage 
data.
Technologies: Java, Spring, Java EE, Oracle DB, Apache Flink, Messaging-/Batch-
Verarbeitung, Microservices · REST APIs
Technologies (Excerpt)
Java · Python · Spring Boot · Kafka · Kubernetes · Docker · REST · Linux · MongoDB · 
PostgreSQL · Azure · AWS · GCP · TCP/Netty · Grafana · Distributed Systems · High 
Availability · Incident Analysis · Microservies · REST APIs

M.Sc. Computer Science - Technical University of Munich