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Carlos Rucker

@carlosrucker

Lead Software Engineer at the IRS modernizing 100+ legacy programs and retiring approximately 12 million lines of code.

At the U.S. Department of the Treasury / IRS, I lead a team of 8 developers modernizing legacy systems. I directed the modernization of 100+ Pro*C/C programs into Java 17 and Spring Boot services, retiring approximately 12 million lines of legacy code.

I provide technical direction for Oracle Exadata data layers and established Liquibase schema baselines. I also built repeatable integration tests and designed TCP communication between Spring Boot applications.

At Financial Network, Inc., I led a Java 8-to-11 upgrade and delivered a reusable Spring Boot library to standardize Google Cloud Pub/Sub messaging across microservices.

At Robert Half, I led delivery of a Java 21 / Spring Boot microservice with 10+ REST APIs, migrating 15+ matching services from a legacy engine. I also delivered Elasticsearch-backed job search with vector-based matching and managed production cutover.

Experience

Work history, roles, and key accomplishments

Current

Lead Software Engineer

Current

U.S. Department of the Treasury / IRS

Mar 2024 - Present (2 years 6 months)

Lead a team of 8 developers and own technical architecture for modernizing legacy IRS systems. Directed modernization of 100+ legacy Pro*C/C programs into Java 17 / Spring Boot services, retiring approximately 12 million lines of code.

Java 17 Spring Boot Spring Data JPA Hibernate Oracle Exadata Liquibase JUnit5 Maven Nexus Red Hat Enterprise Linux

Java Team Lead

Financial Network, Inc.

Apr 2022 - Feb 2024 (1 year 10 months)

Led a team-wide Java 8-to-11 upgrade across Spring projects and submodules. Designed and delivered a reusable Spring Boot library standardizing Google Cloud Pub/Sub messaging across microservices.

Spring Boot Java 8 11 Google Cloud Pub Sub MariaDB MySQL

Senior Software Engineer

Robert Half

Jan 2021 - Apr 2022 (1 year 3 months)

Architected and led delivery of a Java 21 / Spring Boot 3.5 microservice with 10+ REST APIs, migrating 15+ matching services off a legacy monolithic matching engine. Delivered an Elasticsearch-backed job search with vector-based matching.

Java 21+Kotlin Spring Boot 3 Elasticsearch Terraform AWS Maven JUnit5 Logstash

Full Stack Java Developer

The C.A.S.E. Engineering Group

Jul 2019 - Jan 2021 (1 year 6 months)

Modernized IRS web applications using Java, Spring Boot, and React. Drove test coverage from 0% to 80% as part of a refactoring program targeting performance and scalability.

Spring Boot Java 8 React JavaScript SQL Server Elasticsearch S3

Software Engineer

Edtera, Inc.

Oct 2016 - Mar 2019 (2 years 5 months)

Owned architecture planning, feasibility analysis, and end-to-end delivery of Spring REST APIs. Established TDD practices with Spring Test and JUnit 5.

Spring Boot Java 8 Angular TypeScript PostgreSQL