- Achieved significant API response time improvements (up to 90%) through optimization of several bottleneck SQL queries- Optimized legacy code, improving system performance as well as maintainability by writing unit and integration tests- Improved the process of periodically syncing data from a 3rd party API into Elasticsearch, leveraging full-text search with advanced filtering, and further streamlined the transfer of this data to SQL database, achieving a more responsive system

- Migrating Kafka clusters from Amazon MSK to fully-managed cloud provider- Configuring topics, producers, consumers, schema registry, KSQL, Kafka Connect- Designing, building and evolving highly scalable Apache Kafka and Confluent Platform infrastructure using Terraform IaC and Kubernetes- Establishing best practices on the development and maintenance of event-based technologies- Evolving and optimizing enterprise-grade Kafka topologies as organizational utilization grows- Addressing performance and scalability challenges posed by Kafka producers and consumers- Migrating Storm processors to Kafka Streams applications focusing on event-driven architecture

- Developed REST APIs for a mobile banking app using Spring Boot microservices- Built a fast data processing solution using Apache Kafka that is processing millions of events every day- Migrated users from legacy databases to Amazon Cognito- Developed a multi-tenant identity provider using Spring Security- Developed a CRM for a charity organization using Ruby on Rails

- Developed server-side front-end for bank statements (HTML, PDF) parser application using Spring Boot and Thymeleaf

I contributed to Baeldung's Learn Spring Security Core, Learn Spring Security OAuth and Learn Spring courses by writing lesson specific tutorials.In order to come up with a great lesson, I had to research each the topic in depth to fully understand it.Furthermore I had to create code samples and test cases that help students understand the subject well.