Senior Java Developer

• Successfully built a critical payment service responsible for over 30% of the checkout traffic, collaborating with 10+ external teams/systems. This service reduced the fraudulent loopholes, removed unnecessary failure points, and reduced the workload on other services.
• Built a centralized partnership microservice used for managing ongoing partnerships without the intervention of the engineering team.
• Leveraged software engineering expertise to design and develop highly impactful features for diverse partnerships, driving a substantial growth in subscriber acquisition and retention rates.
• Implemented cost-saving measures by conducting thorough efficiency tests and optimizing services, resulting in significant reduction of overall service costs while maintaining high performance and reliability.
• Maintained, scaled, and optimized the cost efficiency of specific EC2 instances by conducting load tests, identifying resource utilization patterns, and implementing performance enhancements to ensure optimal scalability, maximize resource utilization, and reduce operational costs.
• Developed and utilized Docker images to effectively test specific microservices, ensuring seamless deployment and consistent testing environments across different platforms and configurations.

Technologies: Java 11/17, Guice, Apache Cassandra, AWS, Jenkins, Spinnaker, Docker, Gatling, Kafka.

• Extended AI
• Developed an web application which can manage to interpret different Machine Learning experiments and give accuracy results based on the given data.
• Created a job manager using a messaging queue (Google Pub/Sub) for the interaction between the core application and the Machine Learning component.
• Used different Google Cloud tools such as Google Storage or different SQL instances for data storage.
• Used GraphQL (query language) as an alternative to classic REST API, for a better handling of objects for the front-end component.
• Contributed in all phases of Software Development Life Cycle based on Agile methodology, including bug fixing and problem investigation.
• Participated in code review.

Technologies: Java 11, Spring Boot, Hibernate, Maven, PostgreSQL, Google GCP, Google Pub/Sub, GraphQL.

• Data governance application
• Worked on an data ingestion application composed of multiple Java application modules, each having a different functionality in the context of file transfer(FTP, SFTP, HDFS).
• Implemented various features consisting of storing different reports as metadata in Apache Atlas and Elasticsearch.
• Interacted closely with the Big Data department which had the major role in creating pipelines with Apache Airflow using the Java modules.

Technologies: Java 8, Spring Boot, Hibernate, Maven, PostgreSQL, Elasticsearch.

• Automotive application
• Worked on a complex web application developed for a big automotive company. The application stores millions on labeled data about issues found on cars that can be grouped, cataloged and filtered.
• Worked in an Agile format, interacting with product owners within the Scrum process.

Technologies: Java 8, Spring Boot, Hibernate, Maven, OracleDB, Apache Solr.

• RESTful Web Server in Spring
• Developed an application for extracting specific data from candidates' CV using Machine Learning algorithms in order to provide a score which would assist the recruiter in choosing the best candidate for a job.

Technologies: Spring Boot, Kafka, Livy, HBase.