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Semyon Korsakov

@semyonkorsakov

Senior Backend Engineer at PashaPay who delivered cross-border payment integrations and a QR gateway processing 400k+ monthly transactions.

Germany

Message

At PashaPay, I designed and released a cross-border QR payment gateway that reached 400k+ monthly transactions at 99.99% uptime. I also delivered the Paysend cross-border transfers integration to cards and IBAN accounts in 150+ countries.

I led delivery of the Alipay+ integration and built backend services for m10 Business, including an onboarding workflow that cut merchant registration from about five days to under one. I also led a staged cloud-to-on-prem migration of the QR payment service.

Earlier, at Sberbank, I optimized bulk processing by 20× and reduced core API response times by 5×. At BCS Financial Group and Scrile, I built reactive services, document handling and payment-provider integrations, and supported Kubernetes deployments and CI/CD.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

PashaPay

Aug 2024 - Present (2 years 3 months)

Designed and released a cross-border QR payment gateway, scaled to 400k+ monthly transactions at 99.99% uptime. Led end-to-end delivery of Alipay+ integration and Paysend cross-border transfers integration.

Java Kotlin Spring Boot PostgreSQL Kafka Redis Keycloak Event Driven Architecture REST APIs gRPC Docker Kubernetes Prometheus Grafana ELK Datadog Maven ArgoCD

Senior Software Engineer

Sberbank

Aug 2023 - Aug 2024 (1 year)

Led a small team owning a high-throughput core service, optimized bulk entity modification reducing processing time 20x, and reduced core API response times 5x. Built a reusable import/export framework for the admin panel.

Kotlin Spring Boot Kotlin Coroutines Hibernate PostgreSQL RabbitMQ ELK Grafana Prometheus

Software Engineer (Kotlin)

BCS Financial Group

Mar 2022 - Aug 2023 (1 year 5 months)

Designed, built and deployed a cryptography-based service for handling client documents, later reused by 5+ teams. Built high-throughput reactive services with Spring WebFlux and Kotlin Coroutines.

Java Kotlin Spring Boot 3 Spring WebFlux (Reactive)Coroutines Exposed R2DBC PostgreSQL RabbitMQ Spring Security

Java Software Engineer

Scrile

May 2019 - Mar 2022 (2 years 10 months)

Designed and integrated an API module into a legacy product, establishing an approach for adding functionality without major rewrites. Integrated 4 payment providers (Stripe, Iugu, Crypto.com, Cardinity) into the core product.