Juan José Tzun Monterroso
Senior Software Engineer
Summary
Senior Software Engineer with 4+ years of professional experience building, optimizing, and maintaining scalable enterprise systems. Proven track record of resolving critical bugs under pressure, optimizing SQL queries over millions of records (up to 80% performance improvements), and delivering high‑impact features in distributed teams. Known for fast problem understanding, autonomy, and reliability in complex systems.
Overview
6
6
years of professional experience
2
2
Languages
Work History
Senior Software Engineer I
Allied Global Technology Services
Guatemala
02.2025 - Current
- Core developer of an electoral system for Civix, supporting high‑volume, mission‑critical data flows.
- Designed and implemented Spring Boot 3.2 microservices using Spring Cloud and Spring Batch.
- Optimized PostgreSQL queries over millions of records, reducing response times by up to 80% through indexing and query refactoring.
- Developed and maintained Angular 16 frontend, implementing role‑based access control and reactive forms.
- Acted as go‑to engineer for urgent bug resolution, consistently delivering fast and reliable fixes.
- Monitored production systems using Datadog, identifying and resolving performance bottlenecks.
- Managed database migrations with Flyway and version control with Git.
Impact: Frequently requested by team leads for complex debugging and time‑sensitive issues due to speed, accuracy, and system understanding.
Application Developer
Asseco Solutions, S.A.
Guatemala
06.2022 - 02.2025
- Developed customized ERP solutions based on APplus, adapting business logic to client‑specific needs.
- Implemented and maintained Java (Appserver) and Webserver components using HTML, TypeScript, ASPX, JavaScript, and CSS.
- Designed and optimized SQL Server functions, views, and reports, supporting complex business rules.
- Built and maintained iReport templates for operational and financial reporting.
- Collaborated closely with consultants and team leaders in cross‑functional environments.
Web Developer
Webtrack, S.A.
Guatemala
10.2021 - 06.2022
- Developed front‑end features in React using Redux, React Router, and React Hook Forms.
- Implemented role‑based access control and interactive dashboards with ApexCharts and Syncfusion.
- Supported SQL Server stored procedures and reporting with Microsoft Report Builder.
- Integrated and managed GPS tracking modules (Concox, Queclink, Jointech).
Web Developer (Freelance)
Corporación Díaz
Mazatenango
11.2020 - 05.2022
- Designed and developed Proteus, a full business management system (inventory, billing, credits, reporting, permissions).
- Built with Spring Boot 2, Angular 10, and MySQL.
- Deployed and maintained the system on DigitalOcean, handling production issues independently.
Systems Analyst Programmer
CPS Logistics, S.A.
Guatemala
07.2020 - 08.2021
- Backend development in Java with Spring Boot for the Coeus system.
- Frontend development using Angular for maritime logistics modules.
- Designed reports with Jaspersoft iReport and optimized SQL Server queries.
Education
Bachelor in Mechatronics Engineering -
Universidad Del Valle De Guatemala
Guatemala 05.2001 -
Bachelor of Science - Computer And Information Sciences
Instituto Tecnológico Del Suroccidente
Mazatenango, Suchitepéquez 05.2001 -
Skills
Database programming
Microservices architecture
API development experience
Programming languages
Software development
Problem-solving mindset
Timeline
Senior Software Engineer I
Allied Global Technology Services
02.2025 - Current
Application Developer
Asseco Solutions, S.A.
06.2022 - 02.2025
Web Developer
Webtrack, S.A.
10.2021 - 06.2022
Web Developer (Freelance)
Corporación Díaz
11.2020 - 05.2022
Systems Analyst Programmer
CPS Logistics, S.A.
07.2020 - 08.2021
Bachelor in Mechatronics Engineering -
Universidad Del Valle De Guatemala
05.2001 -
Bachelor of Science - Computer And Information Sciences
Instituto Tecnológico Del Suroccidente
05.2001 -