• Member of Apache Spark Platform Team,

• Experience on Spark Query Compilation and Execution,

• Extending Spark Adaptive Query Execution(AQE),

• Improving Spark AQE Skew Mitigation Support for SortMergeJoin and ShuffleHashJoin,

• Extending Spark Memory Management/Consumers and Physical Operators Disk Spilling Support,

• Fixing Spark Driver and Executor Side Memory Problems,

• Tuning Spark Shuffle Partitioning,

• Extending ShuffleHashJoin & BloomFilterJoin features and get production ready for critical and complex queries,

• Working on Spark Scalability, Resilience and Performance,

• Lead Engineer of Progressive Spark Upgrades (Spark is backbone of Prism Data Analytics Platform),

• Lead Engineer of Architectural Improvements of Spark Observability Platform

• Experience on Rust, Scala, Java, Akka, Functional Programming, Distributed Query Execution, Big Data Technologies(e.g: Apache Spark, Hadoop YARN, HDFS, Kafka, S3, AWS, Kubernetes),

• Working on Apache Spark In-house and OSS Patches, ETL Batch Data Processing Pipelines, Distributed Computing Challenges, Performance Improvements.

• Member of Apache Spark Runtime Team

• Lead Engineer of Progressive Spark Upgrades (Spark is backbone of Prism Data Analytics Platform)

• Professional Experience on Scala, Akka, Functional Programming, Distributed Query Execution, Big Data Technologies(e.g: Apache Spark, Hadoop YARN, HDFS, Kafka)

• Working on Apache Spark OSS Patches, ETL Batch Data Pipelines, Distributed Computing Challenges, Performance Improvements.

• Experience on AWS, S3, Docker, Kubernetes.

• Member of Data Transformation Team

• Professional Experience on Scala, Akka, Spray, Big Data Technologies(e.g: Apache Spark, YARN, HDFS, Kafka)

• Working on ETL Batch Pipelines

• Experience on AWS, S3, Docker, Kubernetes

• Working on Data Pipelines, Distributed Computing Challenges, Performance.

Apache Spark:

• Contributed to Spark Job Scheduler Module

Merged Pull Requests:

https://github.com/apache/spark/pulls?utf8=%E2%9C%93&q=author%3Aerenavsarogullari

Apache DataFusion:

• Contributed to DataFusion functions and functions-array crates.

Merged Pull Requests:

https://github.com/apache/datafusion/pulls?q=is%3Apr+author%3Aerenavsarogullari

Apache Pulsar:

• Pulsar-Flink Connector Batch API Support to write Flink DataSets in text, csv and json formats to user-defined Pulsar topics

• Pulsar-Netty I/O Connector: This connector listens incoming TCP messages by initializing TCP server and writes user-defined Pulsar topic.

• Contributed projects' other modules such as Auth, Message Routing, Client API by refactoring.

• Contributed project by reviewing some of the patches.

Merged Pull Requests:

https://github.com/apache/pulsar/pulls?q=is%3Apr+author%3Aerenavsarogullari

Apache Heron:

• Developed Scala Streamlet API by supporting different transformation operations.

• Contributed to Java Streamlet API by applying patches and reviewing some of the patches.

Merged Pull Requests:

https://github.com/apache/incubator-heron/pulls?q=is%3Apr+author%3Aerenavsarogullari+is%3Aclosed

• Leading Product Development Team

• Architecture, Design, Implementation and Testing of Enterprise Java Software Systems,

• Functional & Non Functional Requirement(NFR) Analysis and Implementations,

• Profiling Java Systems and Working on Performance Improvement Tasks,

• Subject Matter Expert(SME) – Spring Integration & RabbitMQ,

• Agile Software Development Skills(Scrum),

• Developing new releases, CRs and Bug­ fixing,

• Developing and Analysing Unit, Integration and Load Tests,

• Operational Support(Critical Issue Solving, HotFix)

• Giving technical trainings