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Renato Guerrero Jr

@renatoguerrerojr

Senior Java Software Engineer at Comtek.Inc - Caterpillar Inc building equipment telemetry and maintenance data services.

Philippines

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At Comtek.Inc - Caterpillar Inc, I engineered Java and Spring Boot services for equipment maintenance records, service history, and operational reporting. I also implemented Kafka-based telemetry ingestion and Spring Batch processing for daily service extracts.

I built AWS Glue and PySpark transformations to combine service activity, inventory movement, and equipment utilization data. I also optimized PostgreSQL queries and added Redis caching for frequently requested equipment information.

At Cognizant, I developed Java and Spring Boot microservices for financial operations and customer account workflows. I implemented Kafka payment-event processing and OAuth 2.0 and JWT access control for internal applications.

Earlier, I developed enterprise applications and integrations at Accenture, IBM, and Exist Software Labs, Inc. My work included backend APIs, SQL optimization, asynchronous processing, and automated testing.

Experience

Work history, roles, and key accomplishments

Senior Software Engineer

Comtek Inc - Caterpillar Inc

Apr 2026 - Oct 2026 (6 months)

Engineered Java 21 and Spring Boot services for equipment maintenance and telemetry ingestion, using Kafka and PostgreSQL. Optimized queries, built AWS Glue pipelines, and containerized services with Docker and Kubernetes.

Java Spring Boot PostgreSQL Hibernate Kafka SpringBatch AWS Glue PySpark Redis Docker Kubernetes Jenkins JUnit5 Mockito Test Containers REST SOAP Git

Software Engineer

Cognizant

Jan 2021 - Mar 2026 (5 years 2 months)

Developed Java 11 and Spring Boot microservices for financial operations, implemented Kafka-based transaction processing, and modernized legacy Java EE applications. Built data pipelines with Azure Data Factory and PySpark, and automated testing with JUnit and Testcontainers.

Java Spring Boot Spring Security OAuth JWT Kafka SpringBatch SQL Server PostgreSQL Oracle Azure Data Factory PySpark RabbitMQ Spring AMQP React TypeScript Junit Mockito Rest Assured Test Containers Docker Jenkins Flyway

Software Engineer

Accenture

Jul 2016 - Dec 2020 (4 years 5 months)

Developed Java 11 and Spring MVC applications for customer account management and billing, integrated with SOAP web services, and optimized SQL queries. Built Angular-based admin interfaces and automated testing with JUnit and Selenium.

Java Spring MVC Spring Boot Spring Data JPA Hibernate Oracle MySQL SQL Server SOAP JAX WS Apache CXF JMS ActiveMQ Angular JavaScript HTML5 CSS Bootstrap Junit Mockito Selenium Jenkins Apache Tomcat Linux

Junior Full Stack Engineer

IBM

Jul 2014 - Jun 2016 (1 year 11 months)

Developed server-side components using Java, optimized SQL queries and PostgreSQL structures, and implemented integration workflows. Containerized applications with Docker and supported Linux environments.

Java REST APIs SQL PostgreSQL Docker Linux HTTP Based APIs Asynchronous Processing

Full Stack Engineer Intern

Exist Software Labs Inc

Apr 2010 - Jun 2014 (4 years 2 months)

Developed backend functionality and REST interfaces for enterprise applications, optimized SQL queries, and automated testing. Worked with Linux deployment environments and server-side diagnostics.

Java SQL REST APIs PostgreSQL Linux Testing Debugging