Jazer Torres

02

Experience

Professional work, most recent first, with selected case studies. Case study details have been generalized to protect confidential and proprietary information.

1. Banregio / Hey Banco

   Monterrey, Nuevo León, Mexico

   Remote

   Financial Services / Banking Technology

   • Backend Developer JrNov 2024 – Aug 2026
   • Backend Developer InternJan 2024 – Nov 2024

   Backend engineering on Java and Spring Boot microservices in a banking technology environment, on the Development Architecture team from June 2024. The path ran from Backend Developer Intern to Backend Developer Jr, with increasing autonomy and responsibility.

   • Java 11
   • Spring Boot
   • Spring Data JPA
   • Hibernate / JPA
   • REST APIs
   • Microservices
   • SQL
   • PostgreSQL
   • Sybase
   • Redis
   • JUnit
   • Mockito
   • SonarQube
   • Checkmarx
   • OpenShift
   • GitHub Actions
   • YAML
   • TypeScript
   • Angular
   • Claude

   Key contributions

   Microservices development

   Contributed to the development, maintenance and evolution of more than 10 microservices, REST APIs and backend components behind Toolbox, an internal platform of approximately 30 process-automation tools used by the bank's development teams. The work covered business logic, persistence, validation, exception handling and scheduled processes, using PostgreSQL, Sybase and Redis.

   Customer login modernization

   Removed a legacy user type from the bank's customer login, which serves both individual and business customers, after users were unified under a single access credential. The code that was no longer needed was also cleaned up across the remaining microservices, covering business logic, REST endpoints, persistence, database interactions and error handling. The change was validated with the full test matrix on the Android and iOS apps, checked for no impact on other bank services, and coordinated with the login team and other teams so it could be rolled out across all of the bank's environments.

   Testing and software quality

   Wrote unit tests with JUnit and Mockito, ran integration and regression testing with testing matrices, debugged issues across microservice and database layers, and resolved quality and security findings from SonarQube and Checkmarx.

   Production support and collaboration

   Debugging, troubleshooting and production support were part of the day-to-day work, including occasionally handling production incidents when the senior developer was unavailable and providing on-call support during application deployments. Participation also covered code reviews, estimation, refinement, planning, daily meetings, retrospectives, demos and releases while the team grew from approximately 10 to 15 people.

   Case Study 01

   Process Automation & Toolbox Reporting

   Toolbox is an internal platform of approximately 30 process-automation tools, backed by more than 10 microservices and used by the bank's development teams. The work focused on automating processes that previously required manual database changes and queries.

   Contribution

   • Created 1 new tool and optimized more than 8 existing tools and solutions, working mainly with Java, Spring Boot, SQL, PostgreSQL and Sybase.
   • Worked on Toolbox front-end projects with TypeScript, using an internal framework based on Angular.
   • Automated the generation of the Toolbox usage report, with daily, weekly and monthly metrics plus charts, using Java, Spring Boot, Java Swing and JasperReports.

   Outcome

   Report generation time

   ~30 min→to~4 min

   ~87% less time

   • Java
   • Spring Boot
   • Java Swing
   • JasperReports
   • PostgreSQL
   • Sybase
   • TypeScript
   • Angular

   Case Study 02

   AI-Assisted Documentation Pipeline

   A proof of concept for centralizing technical and business documentation from approximately 3 internal services across multiple repositories, using an AI agent.

   Contribution

   • Started from an initial prompt that was not producing the expected results and designed a new one, written in English with more precise and restrictive instructions.
   • Tested instruction variants to find which ones used fewer tokens and processed faster.
   • Pre-installed skills before each agent run to speed up execution.
   • Configured YAML service definitions and multi-repository workflows with Claude, GitHub and GitHub Actions to generate centralized documentation such as READMEs.

   Outcome

   Average agent execution time

   ~15 min→to~5–7 min

   ~53–67% less time

   • Claude
   • Prompt design
   • GitHub Actions
   • YAML
   • Multi-repository workflows

   Case Study 03

   High Availability Initiative

   A production High Availability initiative across Banregio and Hey Banco to standardize microservice configurations across many teams and repositories.

   Contribution

   • Coordinated and followed up with multiple development teams on the tasks needed to standardize their microservice configurations.
   • Validated YAML configurations for OpenShift and troubleshot deployment-related issues.

   • OpenShift
   • YAML
   • Cross-team coordination
   • Troubleshooting

   Professional growth

   Moving from intern to Backend Developer Jr meant gradually taking on more autonomy and responsibility: from guided tasks to removing a legacy user type from the customer login, coordinating configuration work with other teams, redesigning an AI documentation workflow, and covering production incidents when needed.

2. OneCard

   Montemorelos, Nuevo León, Mexico

   Hybrid

   Financial Technology / Prepaid Cards

   • Front-End Developer Intern (Part-Time)Jan 2022 – Jul 2023

   A part-time internship of approximately 1 year and 7 months, done alongside university studies. It spanned approximately 5 internal projects and functionalities, with hands-on work in REST API integration, SQL Server and Front-End development in a financial technology environment.

   • REST APIs
   • JSON
   • HTTP
   • SQL
   • SQL Server
   • JavaScript
   • AJAX
   • jQuery
   • HTML
   • CSS
   • Bootstrap
   • Chart.js
   • Git

   Key contributions

   REST API integration

   Consumed and integrated REST APIs, working with endpoints, parameters, payloads, JSON, HTTP status codes, and response and error handling, coordinating each integration directly with a backend developer.

   Database work

   Wrote SQL Server queries using SELECT, JOIN, INSERT, UPDATE and DELETE statements, including validation queries.

   Administrative functionality

   Worked on administrative forms, validations and PDF reports, and took part in debugging, demos, code reviews and presentations.

   Case Study 04

   Transaction Monitoring Application

   An internal production application used for near-real-time monitoring of OneCard product transactions. The work centered on its Front-End.

   Contribution

   • Built 4 Chart.js visualizations showing successful transactions, failed transactions, transaction volume and recent activity, with approximately 3 hours of transaction history.
   • Consumed REST APIs to display transaction data in near real time.
   • Implemented visual and sound alerts that trigger after more than 5 consecutive failed transactions.

   • Chart.js
   • JavaScript
   • REST APIs

   Professional growth

   Practical exposure to financial systems, REST API integration, SQL, transaction monitoring and the collaboration between Front-End and Backend teams.

3. Universidad de Montemorelos

   Montemorelos, Nuevo León, Mexico

   On-site

   Enterprise / Academic Systems

   • Software Developer Intern (Part-Time)Aug 2019 – Dec 2021

   The first professional software development experience: a part-time internship of approximately 2 years and 5 months, spanning approximately 3 internal systems and 20+ features and tasks.

   • Java 11
   • Spring Boot
   • Spring MVC
   • JPA / Hibernate
   • Maven
   • SQL
   • Oracle
   • JavaScript
   • HTML
   • CSS
   • jQuery
   • Bootstrap
   • Thymeleaf
   • AJAX

   Key contributions

   Systems

   Most of the work went into the university's Academic System, used daily by students, professors, employees and administrative departments, with additional work on the Asset Management System and one more institutional system.

   Backend and frontend development

   Worked in a monolithic MVC architecture on business logic, validation, repositories, entities, exception handling, document generation and maintenance of existing applications, and developed and redesigned administrative screens, forms, UI components and asynchronous interactions.

   Requirements and collaboration

   Met with Finance and other areas to understand business needs, then worked with the development team to translate them into functional and technical changes, in a team of approximately 6 people that included developers, interns and a team lead.

   Professional growth

   The work moved from highly guided tasks toward more complex requirements and greater participation in evaluating solutions. This stage set the foundations in Java, Spring, databases, persistence and Full Stack development, and it is where the interest in Backend Engineering began.

03

Skills

04

Contact Me

• Emaileryjazer@gmail.com↗
• LinkedInlinkedin.com/in/eryjazer↗
• GitHubgithub.com/elMushu↗
• ResumeDownload PDF↗