Completely redesigned the full-deal system architecture, migrating it from PHP to .NET, which improved stability and scalability.

Key Achievements:

• Designed the end-to-end deal process
• Migrated data from MongoDB to PostgreSQL
• Implemented SAGA patterns (Kafka choreography for deposit auto-renewal)
• Bank integrations
• Kafka implementation for event-driven architecture
• Monitoring setup: Prometheus, Jaeger, Kibana
• Load testing with k6
• Reliable hybrid cache manager with Circuit Breaker

Developed end-to-end insurance service from scratch:

• Integration with insurance companies
• Data processing optimization
• Error monitoring system implementation

Tech Stack:

• C# .NET Core microservices
• PostgreSQL and ClickHouse databases
• RabbitMQ and Kafka message brokers
• XUnit for unit testing
• Entity Framework
• Redis for in-memory caching
• ArgoCD for Kubernetes CI/CD
• Grafana monitoring and alerting
• Prometheus metrics
• OpenSearch/Kibana logging
• Jaeger request tracing

Developed reporting system based on r-keeper and DeliveryClub data. Built microservices for data collection, processing, enrichment, aggregation and reporting.

Key Achievements:

• Led development of integration test framework for web services
• Led development of notification microservices using SAGA choreography

Tech Stack:

• C# .NET Core microservices
• MS SQL Server, PostgreSQL and ClickHouse databases
• RabbitMQ message broker
• GraphQL APIs
• NUnit and XUnit for unit testing
• Entity Framework
• Redis for in-memory caching
• TeamCity and Octopus for CI/CD
• Rancher for Kubernetes cluster management
• Grafana with Graylog for data visualization and monitoring

Developed web services for cryptocurrency exchange. Integrated various blockchains like ETH and BTC into exchange infrastructure.

Key Achievements:

• Spearheaded development of unified platform for blockchain integration (ETH, BTC etc.), reducing integration time by 10x while minimizing codebase and errors.

Tech Stack:

• C# .NET Core and Node.JS (TypeScript) microservices
• PostgreSQL and ClickHouse databases
• Kafka message broker
• gRPC APIs
• TeamCity CI/CD
• Rancher for Kubernetes management
• ELK Stack with Grafana for data visualization

Developed and maintained payment processing center. Managed projects using MasterCard and Mir payment systems.

Key Achievements:

• Developed OpenAPI for banking processing integration
• Configured GitLab CI/CD for K8s with health/liveness checks
• Created Docker images for .NET Core APIs

Tech Stack:

• C# .NET Core microservices
• C-based payment processing
• Kafka message broker
• GitLab CI/CD and TeamCity
• Oracle PL/SQL and PostgreSQL databases

Developed internal corporate information system. Started as intern, grew to mid-level developer.

SQL Server & T-SQL Development:

• Created and optimized stored procedures, triggers and functions
• Database design (tables, views, keys, indexes) and normalization
• Query execution plan analysis and optimization
• SQL Server CLR integration, CLR objects implementation

C# and WCF Development:

• Developed WCF service for internal system with external API integration
• Extended functionality by adding new classes and methods

Delphi and MS SQL Development:

• Maintained and enhanced corporate information system
• Developed business modules and user forms
• Created database objects for data management