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William VelizWV

William Veliz

Software Engineer

€200/day
Cuenca, EC
3-7 years
Java
Microservices
PostgreSQL
CI/CD
React.js

Average response time: 1 hour

Freelancer profile translated to English.
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About William

I am a Software Engineer specialized in Java, Quarkus, and Spring Boot, with over 3 years of experience building scalable, secure, and high-performance microservices. I help banking, fintech, and startup companies transform their processes through modern architectures, robust APIs, and cloud-ready solutions.

My value proposition focuses on optimizing performance, ensuring quality with CI/CD, and designing modular services that reduce maintenance costs. I am proficient in integrating with databases such as PostgreSQL, MS SQL Server, and Oracle Database, as well as deploying in containers and Kubernetes/OpenShift.

Additionally, I bring a full-stack vision, developing interfaces with React.js to create fluid and efficient user experiences. I am accustomed to working in agile environments, collaborating with multidisciplinary teams, and ensuring quality deliverables within demanding deadlines.

I have participated in projects involving banking integration, payment gateways, REST APIs, notifications, and service orchestration, always prioritizing scalability and security.
E-commerce
Consulting and Audits
Banking and Financial Services
Digital and IT Services
Sports

  • Spanish

    Native or bilingual

  • English

    Conversational

Remote only
Primarily works remotely

Experience

  • Banco del Austro
    Developer Engineer
    BANKING AND INSURANCE
    July 2024 - Today (2 years and 1 month)
    Cuenca, AZ, Ecuador
    • Architected and developed high-performance Java microservices (versions 8-21) with Spring Boot and Quarkus, utilizing virtual threads and native compilation to significantly improve system efficiency and reduce response times.
    • Implemented and managed event-driven and microservice architecture patterns, including SAGA, to ensure resilient distributed transactions for international bank transfers and Mastercard integrations.
    • Automated CI/CD pipelines using GitLab CI/CD, YAML, and Git for reliable, version-controlled builds and deployments to OpenShift container platforms.
    • Spearheaded a comprehensive testing strategy that increased unit and integration test coverage from 60% to 85%, significantly enhancing code reliability and reducing production errors.
    • Led the integration of Oracle Banking Digital Experience (OBDX) to streamline core services and administered banking modules on JBoss and WildFly servers, improving transactional efficiency.
    • Managed and optimized relational databases (Microsoft SQL Server, Oracle) and refactored legacy C# web applications to improve performance, readability, and maintainability.
    • Architected and developed modern, responsive front-end applications using React and Tailwind CSS, leveraging Vite for an optimized build process and TypeScript to ensure scalable, type-safe, and maintainable code.
    Java CI/CD Microservices React.js Quarkus
  • AustroRed
    Developer Engineer
    BANKING AND INSURANCE
    July 2023 - July 2024 (1 year)
    Cuenca, AZ, Ecuador
    • Developed and documented Java microservices using Spring Boot, Quarkus, and Swagger, incorporating JUnit 5 and Mockito to automate unit testing and ensure code quality.
    • Executed performance tests with JMeter, identifying and resolving bottlenecks to achieve a 30% improvement in service response times.

    • Refactored legacy Java microservices and C# projects to optimize REST communications and enhance performance, maintainability, and business logic for key banking applications.
    • Automated CI/CD pipelines using GitLab for version control, building, and deploying applications to OpenShift, while enforcing code quality standards with SonarQube.
    • Managed and optimized SQL Server databases, implementing event-driven triggers to improve data integrity and process automation.
    Quarkus Spring boot Microsoft SQL Server Oracle Database OpenShift
  • Freelancer
    Developer
    PUBLIC SECTOR
    November 2022 - July 2023 (8 months)
    Cuenca, AZ, Ecuador
    • Developed dynamic and responsive web applications using React to build modern front-end interfaces.
    • Built and maintained Java-based services with Spring Boot, ensuring reliable interaction with SQL Server and PostgreSQL databases.
    • Optimized legacy monolithic applications by refactoring C# and Python code, resulting in improved efficiency for data processing and management.
    Python .NET C# PostgreSQL React.js JavaScript

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Education

  • Bachelor of Science
    University of Cuenca
    2023
    Bachelor of Science

Skill set

Backend Service Development
External API integration
Performance Optimization
Software Architecture
Testing and Quality Assurance
Microservices Architecture
Cloud Integration
Least Privilege Principles
Algorithms and Data Structures
Data integration (ETL, ELT and data warehousing)
Data Cleaning and Preprocessing
ETL (Extract, Transform, Load) Processes
Quarkus
Spring boot
Microsoft SQL Server
Oracle Database
Python
.NET C#
OpenShift
JavaScript

Categories