Senior Java Developer

A large project to facilitate trading in financial markets.

Trading Module Development: Designed and implemented a custom module for securities trading types using Spring Integration, EMS, and IBM MQ; optimized performance with caching connection factory.

Concurrency & Reactive Processing: Ensured concurrent trade processing using @Async and thread pools; leveraged RxJava and Spring WebFlux for reactive, event-driven workflows.

Cloud Infrastructure (AWS): Deployed trading solutions on AWS EC2, managed networking with Route 53, and configured security policies and firewall rules for new services.

Database & Caching: Worked intensively with SQL; integrated Elasticsearch for full-text indexing and near-real-time search; implemented Redis for high-speed access to hot intra-day data.

Testing & Profiling: Built integration and performance testing pipelines simulating different garbage collectors and heap configurations; profiled runtime applications to detect and prevent memory leaks.

System Design: Created a robust message queue data structure ensuring efficient and ordered transaction processing in high-frequency trading.

AI/Automation: Integrated AI-driven trade analysis via Python scripts calling Qwen 8B, LLaMA 8B, and ChatGPT APIs to analyze trade sequences and suggest instrument strategies.

Developed and maintained Java applications, bugfixing, participating in daily scrum meetings.

Development tools: IntelliJ IDEA, Gradle, IoC/DI, Java 8, Python, JDBC/Hibernate/JPA, Spring Integration, IBM MQ, TIBCO EMS, REST, Git, GitLab, Autosys, Aeron, Chronicle, Elasticsearch.

In charge of a large microservice project providing web internet security solutions: web antivirus tools, website trust score, log analyzer, and firewall tools across ~11,000 distributed microservice instances.

Optimized connection establishment, relaxing security requirements for legacy clients and enforcing secure cipher suites for eligible clients.

Designed a custom URL scanner for safe search.

Optimized threat scanning and security checks using the Concurrency API to speed up the scanning pipeline.

Utilized JVisualVM to identify and fix memory leaks related to open connections; performed application profiling.

Implemented REST services and business logic in Spring and Scala.

Designed data structures for executable file scanning, ensuring parallel processing with minimal memory usage.

Fixed security and core issues.

Administered servers and deployments on Mesos/Marathon.

Designed data structures for network traffic logs to efficiently process large volumes of web traffic with minimal latency.

Monitored Vertica → Kafka → ELK pipeline; added Spark: Vertica → Kafka → Spark → ELK; wrote Spark streaming processor to analyze real-time traffic events.

Developed efficient graph structures to represent and analyze security threats for optimized querying.

Developed a firewall configuration module using React.

Project to develop software for bank resource management, supporting ~50 million customers; enabled workflow viewing, tracking, validation, loan justification, invoice payment, spreadsheet sharing, liquidity estimation, and reminders.

Developed a user-friendly onboarding system for enterprise customers, reducing process time by 40% and improving satisfaction.

Implemented a comprehensive auditing feature to ensure compliance and improve data security.

Received recognition for high-quality code delivery ahead of schedule.

Led UI/UX team to revamp the interface, increasing user engagement.

Integrated a third-party API, expanding functionality and increasing user retention by 20%.

Participated in SCRUM meetings, implemented new features, conducted bug fixing, and consulted with the team lead.

Programming languages and tools: Java 5, GWT, Vaadin, EJB/JSF, Servlets, Jersey, MyBatis/JDBC, gRPC, PL/SQL, XML, JavaFX, Thymeleaf, REST/SOAP, Oracle, Eclipse, Gerrit, Jira, Jenkins, Ant, WebLogic.