Sergei Vorobev
Senior Backend Engineer @HelloFresh
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WORK HISTORY
Senior Backend Engineer @HelloFresh
Berlin, DE
Team: Finance-Tech, FulfillmentKey Achievements- Architected and developed a custom event bus library leveraging PostgreSQL event tables as a distributed queue with locking and cleanup mechanisms, enabling reliable and scalable event-driven architecture- Built core microservices around this event bus powering purchase order management, inventory audit, inventory movement, manufacturing costs, and more, ensuring high modularity and fault tolerance- Implemented event delegation to specific handlers based on event types, significantly improving maintainability and extensibility- Integrated backend services with Oracle Fusion Cloud for real-time financial data posting, meeting enterprise compliance standards- Spearheaded backend development with Kotlin, PostgreSQL, Apache Kafka (with Protobuf and Avro serialization), AWS, Docker, and RESTful APIs- Contributed to frontend components using React and TypeScript to support internal tooling- Championed automated testing with comprehensive unit and integration tests, ensuring production stability and quality- Recognized as a key technical leader and problem solver within the Finance-Tech team, mentoring peers and driving best practices.Tech stack: Kotlin, PostgreSQL, Apache Kafka (Protobuf, Avro), Flink, AWS, Docker, REST APIs, React, TypeScript, Spring Boot, Microservices, Automated Testing
EDUCATION
Lomonosov Moscow State University (MSU)
Specialist, Mechanics and Mathematics
ABOUT SERGEI VOROBEV
Backend engineer with 9+ years of experience designing and delivering scalable, high-performance distributed systems and event-driven architectures.Proven track record of building mission-critical microservices and libraries, driving cloud-native transformations, and mentoring teams in modern backend development practices.Technical skills: Languages: Java 8–21, Kotlin, TypeScript, JavaScript Frameworks & Libraries: Spring Boot, Spring Data, Spring Cloud, Spring Security, Spring Batch, Guice, Hibernate, JOOQ, Apache Camel, React, AngularJS, Angular 2 Build & CI/CD tools: Maven, Gradle, Jenkins, GitLab CI, Bamboo, SonarQube, SonarCloud Testing: JUnit 4/5, Mockito, TestNG, TestContainers, Hamcrest APIs & Protocols: REST, SOAP, GraphQL, Protobuf, Avro Databases: PostgreSQL, Oracle Messaging & Caching: Apache Kafka (with Protobuf, Avro), Flink, Redis, IBM MQ Cloud & Containerization: AWS (EC2, Lambda, EKS, CloudWatch, IAM, MSK, S3), GCP, Docker, Kubernetes, OpenShift, Istio, Helm Others: LDAP integration, Apache POI, JAXB, FreeMarker, Event Sourcing, CQRS, in- Designing event-driven systems with custom event bus implementations - Microservices architecture and service orchestration - Integration with enterprise systems (e.g, Oracle Fusion Cloud)- High-load systems scaling and performance tuning - Setting up and maintaining CI/CD pipelines and automated testing frameworks
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