Senior Java Developer

Senior Java Developer — Vanguard Tech Solutions

Seattle, WA | January 2022 – Present

• Architected a cloud-native Spring Boot payment gateway servicing 3.5M daily active users, improving processing throughput by 32% and reducing average checkout latency from 450ms to 120ms.
• Led the migration of a legacy monolithic platform to containerized microservices on AWS (EKS, EC2), decreasing deployment cycle times by 40% and infrastructure spend by $78,000 annually.
• Implemented asynchronous event-driven pipelines using Apache Kafka and Java 17 virtual threads, resolving concurrency bottlenecks and boosting data ingestion rate by 45%.
• Mentored 5 junior and mid-level developers on JVM performance tuning and thread profiling, raising team code review efficiency and sprint completion rate by 18%.

Java Software Engineer — Echelon Cloud Systems

Bellevue, WA | June 2016 – December 2021

• Developed 24 microservices using Spring Boot and Hibernate, enhancing data synchronization efficiency between front-end interfaces and Oracle databases by 35%.
• Configured GitLab CI/CD pipelines and automated unit testing workflows with JUnit 5 and Mockito, increasing code coverage from 55% to 92% and reducing post-deployment bugs by 26%.
• Optimized SQL query performance and database indexing, which decreased system read times by 24% and stabilized performance during peak traffic hours for 1.2M users.
• Designed and implemented a secure OAuth2 and JWT authentication server using Spring Security, mitigating login vulnerabilities and reducing authorization latency by 15%.

Java (8, 11, 17, 21), Spring Framework, Spring Boot, Spring Cloud, Spring Security, Hibernate ORM, RESTful APIs, Microservices, Apache Kafka, SQL, PostgreSQL, Oracle DB, AWS (EC2, S3, RDS, EKS), Docker, Kubernetes, Git, GitLab CI/CD, JUnit 5, Mockito, Maven, Gradle, Agile, Scrum

High-Throughput Billing Engine

Role: Lead Java Developer

Tools: Java 21, Spring Boot, Apache Kafka, AWS RDS, Docker

Led the design and delivery of a serverless invoice processing system that handled 10M transactions daily, reducing average processing latency by 34% and server costs by $35,000 annually.

Enterprise Data Synchronizer

Role: Senior Java Developer

Tools: Java 17, Spring Boot, Hibernate, Apache Camel, PostgreSQL

Architected a real-time data sync pipeline transferring 500GB of transactional records daily, improving sync accuracy to 99.99% and cutting sync windows by 4 hours.

• Oracle Certified Professional: Java SE 21 Developer (2024)
• Spring Certified Professional (2022)

• Languages: English (Native), German (Conversational)
• Volunteer Work: Open-source contributor to local civic tech projects (2020-present)
• Availability: 2 weeks notice