sergiishapoval

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. Environment: Go, Java, Kafka, REST, Kubernetes

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. Environment: Go, gRPC, Kafka, Temporal, PostgreSQL, AWS, GCP, Kubernetes, Stripe

- 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.