Oscar Munar Java Full Stack Developer

Java Full Stack Developer

N-iX

Apr 2025 - Current (1 year 4 months)

Tech: Java, GitHub Copilot, SQL Server, JSP, JSF, GIT, Maven, Tomcat. Accelerated feature delivery by ~30% by integrating GitHub Copilot into the development workflow, reducing boilerplate code generation time across 5+ product modules. Designed and implemented full-stack solutions for a cloud-based real estate lifecycle platform covering lease management, accounting, and construction project tracking. Translated business requirements into Java implementations following Agile/Scrum methodology, participating in sprint planning, reviews, and retrospectives. Improved system test coverage by 20%+ by implementing targeted JUnit unit tests across critical modules. Designed and updated UI screens for multiple modules using JSF/Primefaces, aligne

Software Engineer

Consejo Superior de la Judicatura

Aug 2024 - May 2025 (10 months)

Tech: Java 17/21, Apache Camel, Quarkus, Kafka, REST, SOAP, Azure DevOps, OpenShift, Docker. Served as Tech Lead for the interoperability integration between 8+ Colombian government entities via an Enterprise Service Bus (ESB), performing technical review and approval of microservice implementations developed by an external team of 3 developers and 1 QA; the initiatives led reduced interoperability-related errors by 35% and significantly cut billable development hours through improved delivery guidance. Engineered and maintained microservices using Quarkus and Apache Camel deployed on Red Hat OpenShift, supporting CI/CD pipelines through Azure DevOps. Supervised migration of legacy on-premise infrastructure to AWS public cloud, ensuring ze

Java Developer

DXC Technology

Jul 2023 - Jul 2024 (1 year 1 month)

Tech: Java 8/11, Spring Boot, Kafka, Elasticsearch, Redis, MongoDB, PostgreSQL, Azure. Led Oracle-to-PostgreSQL migration for a multi-module enterprise system, replacing direct JDBC access with Hibernate/JPA ORM, achieving zero data loss, improving query maintainability, and reducing DB licensing costs. Improved system security posture by eliminating hardcoded credentials across the codebase and migrating secrets management to Azure Key Vault, ensuring compliance with organizational security standards. Implemented and maintained RESTful microservices following SOLID principles and clean code practices; validated with JUnit and Mockito test suites. Collaborated in Agile squads using GIT branching strategies, pull request reviews, and conti

Java software developer

Despegar

Jun 2022 - Jul 2023 (1 year 2 months)

Tech: Java, Spring Boot, Kafka, Elasticsearch, Kibana, Redis, MongoDB, MySQL, AWS. Designed and implemented event-driven microservices using Apache Kafka to process high-volume invoice reconciliation workflows handling 100K+ daily transactions with full traceability via Kibana dashboards. Built and maintained backend services integrated with AWS infrastructure including EC2, Lambda, Step Functions, API Gateway, Cognito, DynamoDB, and CloudWatch. Supported current microservices ecosystem, resolved production incidents within SLA maintaining system uptime above 99.5%, and improved batch processing performance by 5% by refactoring Spring Batch job logic to reduce processing overhead. Worked in an Agile team using Jira for backlog management,

Full Stack Developer

Seven4n

Mar 2022 - Jun 2022 (4 months)

Java Developer: analyzed backend web systems to design and implement new solutions based on Java. Used Spring Boot, microservices and API REST.

Freelance Full Stack Developer

Artemisa Tech SAS

Jan 2022 - Dec 2022 (1 year)

- Developed and maintained robust back-end systems using Java (Spring Boot) and .Net Core 8 to deliver high-performance applications. - Managed database schemas and optimized data queries using PostgreSQL, SQL Servers and MongoDB ensuring high availability and scalability. - Architected and deployed serverless cloud functions using AWS Lambda to enhance system efficiency and reduce operational overhead. - Designed and integrated secure Application Programming Interfaces (APIs) to facilitate seamless data exchange across distributed architectures. - Leveraged proficiency in C# and .NET Core 8 to provide comprehensive support and implement new features for legacy systems, utilizing Entity Framework to maintain consistent data access patterns

Professor

Universidad de Antioquia

Jun 2021 - Dec 2021 (7 months)

Development Instructor. Taught basic programming, Python, Java, GIT and control versioning, Web programming and CI/CD at the Technology Information and Comunication Ministry program called Misión TIC 2022.

Full-stack developer

Lean Tech

Apr 2021 - Apr 2022 (1 year 1 month)

Tech: Java 11/17, Spring Boot, Kafka, Feign Client, Docker, Jenkins, ReactJS, PostgreSQL, MongoDB, Redis. Built and maintained CI/CD pipelines using Spinnaker and Jenkins for 5+ microservices owned by the team (part of a 50+ microservice distributed platform), reducing manual deployment time by ~40% and enabling bi-weekly release cycles; supported system monitoring to detect and triage production issues proactively. Developed solutions within a 50+ microservice distributed platform applying CQRS pattern (MongoDB for write operations, PostgreSQL for read operations); the team’s scope covered 5+ microservices within the truckload tracking domain, built with Spring Boot, Kafka event streaming, and ReactJS frontend with React Hooks. Implemente

Full-stack java developer

DIAN Dirección de Impuestos y Aduanas Nacionales

Jan 2018 - Apr 2021 (3 years 4 months)

Tech: Java, JavaEE, Spring, Hibernate/JPA, JSP, JSF, Primefaces, Oracle, PL/SQL, Azure, GIT, JBoss/Wildfly. Delivered full-stack Java solutions for a national tax management system serving millions of individual taxpayers, ensuring regulatory compliance and full audit traceability. Implemented Oracle PL/SQL stored procedures for complex report generation, reducing report processing time by over 50%. Designed and launched application containers (Wildfly/JBoss) in test and production environments, and provided production support resolving critical alerts and bugs. Led UI development for multiple tax system modules using JSF/Primefaces, translating functional requirements into production-ready interfaces. Built technical architecture diagrams

Developer engineer

ICETEX

Nov 2017 - Dec 2017 (2 months)

As a Developer Engineer, I modeled and designed systems using BPMN (Bizagi) and provided support in the analysis and design of web systems, creating detailed mockups to visualize project requirements. My analytical skills were essential in ensuring that the systems met business needs effectively. Additionally, I designed systems with a focus on future development in Java, ensuring a seamless transition from design to implementation, which enhanced the overall project workflow and efficiency. I managed the main version repository on GitHub, utilizing Git for version control to ensure efficient collaboration and seamless code integration throughout the development lifecycle.

I

Development engineer

IDEP - Instituto para la Investigación Educativa y el Desarrollo Pedagógico

May 2017 - Dec 2017 (8 months)

Performed the whole process for the development of software for the research project in evaluation practices: gathered functional requirements, designed the architecture, built the respective documents, performed the analysis and design of the applications and the data model to record the information to be investigated, implemented the code, performed the respective tests on the system and deployed the application in the production environment. The information collected was stored, processed and a set of statistical reports were obtained to show the results of the research study. A document and bibliographic repository based on DSpace was customized, configured and deployed in a production environment. Worked with PHP, Java, Weblogic, Apach

PHP and java software developer

Icfes

Jan 2015 - Mar 2017 (2 years 3 months)

Full Stack Java Developer: designed, developed and implemented solutions for the organization's web systems in the Pruebas Electrónicas project. Worked with web services, API REST, JavaEE, JPA, Redis, MySql, Postgres, Oracle, GIT, SVN, Maven and Glassfish. Supported Frontend systems based on Angular js. PHP Developer: maintained and supported the developments on the TAO platform on which the electronic tests were performed. Configured the basic infrastructure for PHP-based applications, administered and provisioned the remote servers for Linux-based test environment. I designed and implemented the procedures for automated provisioning of tests on the TAO platform. • Leveraged Python and RESTful APIs to facilitate data exchange and integrati

Intern of infraestructure, network and help desk

Icfes

Aug 2014 - Jan 2015 (6 months)

Oscar Munar

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