Java Backend Developer

Java Backend Developer — Apex Fintech Solutions

Chicago, IL | November 2023 – Present

• Engineered a Java backend payment gateway handling 150,000 daily transactions, implementing Spring Boot and Hibernate to improve transaction throughput by 26%.
• Migrated legacy monolithic billing system to AWS microservices using Docker and Amazon EKS, reducing infrastructure deployment and scaling times by 42%.
• Optimized PostgreSQL database performance by rewriting complex queries and designing indexes, reducing read latency by 38% and saving $35,000 in annual licensing costs.
• Collaborated with a cross-functional team of 8 engineers in an Agile environment to build a real-time ledger using Kafka, increasing active user transaction speed by 18%.

Software Engineer (Java) — Beacon Health Systems

Chicago, IL | June 2021 – October 2023

• Developed and maintained 20 RESTful API endpoints using Spring Boot, enhancing integration speed with 5 major third-party healthcare service vendors by 22%.
• Implemented automated unit testing workflows using JUnit and Mockito, boosting test coverage from 50% to 88% and preventing approximately 15 post-release bugs monthly.
• Resolved system bottlenecks in message queues using RabbitMQ, improving data sync speed across 3 legacy patient record systems by 31% for 400,000 active users.
• Designed and scheduled automated background jobs using Spring Batch for daily medical insurance claims processing, reducing processing runtime from 12 hours to 3 hours.

Java, Spring Boot, Spring Cloud, Hibernate, Spring Data JPA, SQL, PostgreSQL, MySQL, AWS, Docker, Kubernetes, Apache Kafka, RabbitMQ, Git, JUnit, Mockito, RESTful APIs, Microservices, Redis, Agile, Scrum

Cloud-Native Ledger System

Role: Lead Backend Engineer

Tools: Java, Spring Boot, AWS Lambda, DynamoDB, Docker

Built a serverless financial ledger that handled 8M daily ledger operations, reducing server costs by 35% and API response time by 42%.

High-Throughput Order Processor

Role: Java Developer

Tools: Java, Spring Boot, Apache Kafka, Redis, PostgreSQL

Implemented Kafka messaging and Redis caching, cutting average processing latency by 48% and database load by 55% for 300,000 daily active users.

• Oracle Certified Professional: Java SE 17 Developer (2023)
• AWS Certified Developer – Associate (2022)

• Languages: English (Native), German (Conversational)
• Volunteer Work: Technical mentor for regional non-profit software bootcamps (2022-present)
• Availability: 2 weeks notice