Stack: Java 17, Gradle, Spring(Boot, Web, Data, Security, Cloud Stream), Quartz, PostgreSQL, Flyway, RabbitMQ, Kafka, Jaeger, Prometheus, Docker, Kubernetes, Kibana, ElasticsearchImplemented async processing of robust fault-tolerant jobs, which retrieve credit bureau data, with automatic failure recovery and reschedule ability using Quartz and RabbitMQ

Stack: Java 11, Gradle, Spring(Boot, MVC, Security, Data), Uber Cadence, PostgreSQL, Cassandra, Kafka, Redis, Elasticsearch, Google PubSub, Docker, Kubernetes, Helm, GCP, PrometheusImplemented SAGA orchestration pattern for handling distributed transactions accrossmicroservices using Uber CadenceDesigned and implemented a system, that automatically detects vendor's file schema changeand transforms file to customer-friendly format, which highly increased system's fault toleranceand drastically reduced manual effort needed to handle error casesDesigned and implemented flexible and extendable system allowing to run executables writtenin any language inside of Java subprocessImpemented high performance REST APIs for data aggregation powered up with Redis caching

Stack: Java 11, Spring Boot, RxJava, Kafka, Zookeeper, Apache Cassandra, Docker, Jenkins, Maven, Kibana, Grafana, GitLab CIDesign and implementation of event-driven microservicesImplementation of reactive high performance REST APIsPerforming data migrations for NoSQL databases