Marcus T. Okonkwo

Profile

Senior Java Developer with 9 years building high-throughput microservices and distributed systems for fintech and e-commerce platforms. Specializes in Spring Boot, Kafka-driven event architectures, and cloud-native deployments on AWS. Reduced payment-processing latency by 41% at a Series B fintech and led a team of 6 engineers through a zero-downtime monolith-to-microservices migration.

Work Experience

Senior Java DeveloperMar 2021 - Present

Meridian Payments Inc., Austin, TX

Architected a Kafka-based event-streaming pipeline handling 18,000 transactions/sec, cutting end-to-end payment latency from 340 ms to 200 ms (41% reduction).
Refactored a 400K-line Spring MVC monolith into 14 independently deployable microservices, eliminating 3 annual scheduled-downtime windows and saving $220K/yr in SLA penalties.
Mentored 4 mid-level engineers through OCP Java 17 certification prep, achieving a 100% pass rate and reducing external contractor spend by $85K in 12 months.

Java DeveloperJun 2018 - Feb 2021

Stackline Commerce, Denver, CO

Built a product-recommendation engine in Java 11 and Spring Boot that increased average order value by 17% across 2.3 million monthly active users.
Optimized Hibernate query plans and introduced Redis caching, dropping p99 API response time from 1.8 s to 390 ms on the catalog-search service.
Delivered CI/CD pipelines via Jenkins and Docker that cut release cycle time from 3 weeks to 4 days, enabling 12 production deployments per month.

Junior Java DeveloperAug 2015 - May 2018

Brightpath Software Solutions, Dallas, TX

Developed RESTful APIs consumed by 6 enterprise clients, supporting a product line that generated $4.2 M in annual recurring revenue.
Wrote 1,400+ JUnit and Mockito unit tests that raised code coverage from 38% to 84%, reducing post-release defects by 62% over 18 months.
Integrated a third-party OAuth 2.0 identity provider, eliminating a legacy LDAP bottleneck and reducing authentication failures by 91%.

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