Sergii Shapoval

• Established the foundation of a new Go backend with DDD-inspired application modules, gRPC services, and an HTTP gateway over gRPC.
• Built shared gRPC interceptors, protoc-/openapi-based generated code.
• Set up CI with unit, integration, component tests; configured automated releases and release notes, main branch auto-promotion, and on-demand feature-branch deployment workflows.
• Contributed technical decisions and design reviews on service boundaries and integration patterns while remaining hands-on in implementation.

Cloud-native data warehouse platform — billing and payments domain ownership within high-availability, multi-region control plane.

• Led end-to-end design and implementation of revenue-critical billing, pricing logic, and payment-method capabilities (credit card, ACH, wire transfer) including Stripe integrations and cloud marketplace billing flows.
• Architected and evolved gRPC-based microservices and Temporal workflows supporting metering, pricing, and payment processing pipelines.
• Defined service contracts and event-driven boundaries across control-plane services, improving long-term maintainability and reducing cross-team ambiguity.
• Drove AWS and GCP Marketplace payment integrations from design documentation through implementation planning and cross-functional rollout.
• Embedded observability-first engineering practices (distributed tracing, structured metrics, alerting, runbooks) enabling early defect detection in staging and efficient production triage.
• Actively reviewed pull requests, contributed to coding/testing standards, and led technical interviews.
• Contributed to architectural decisions beyond billing domain while owning delivery of new high-impact features across the control plane.

Backend development within a distributed personal finance platform.

• Designed and implemented event-driven backend services powering transaction-based product triggers.
• Built and maintained Kafka-based notification services supporting scheduled and batch communication flows.
• Resolved authentication and session management issues that were degrading system reliability.
• Identified and eliminated memory leaks impacting application stability and release confidence.
• Improved service boundary clarity and failure-handling paths within a multi-service distributed environment.

• Built and optimized REST/SOAP integrations, persistence models, and schema migration flows in Java backend systems.
• Developed OAuth2 clients, asynchronous data-processing pipelines, and backend tooling for integration-heavy systems.
• Contributed to technical documentation and domain modeling efforts improving long-term system maintainability.

International Business / Business Administration