Freelancer profile translated to English.
Back to original languageAbout David Alfonso
Looking to scale your backend infrastructure, securely integrate global payment gateways, or accelerate your development workflows with efficient automations? I help you transform complex business requirements into robust, maintainable, and high-performance software.
English
Native or bilingual
Spanish
Native or bilingual
Remote only
Primarily works remotely
Experience
- Stefanini Group (Cliente:Java Development Lead / Tech LeadSOFTWARE PUBLISHINGJanuary 2016 - February 2025 (9 years and 1 month)Technical leadership of high-complexity and criticality projects in the banking sector, coordinating multidisciplinary development and testing teams.Architecture and development of tokenized payment solutions integrated with VISA, Mastercard, Apple Pay, and Google Pay for mobile wallets, ensuring the highest standards of performance and transactional security. Complete leadership of the development cycle: requirements analysis with the business, architectural design, effort estimation, backend coding support, and coordination of testing teams. Key technical support and preparation for thorough audits by the bank and corporate clients, ensuring compliance with security policies and enterprise architecture. Technology Stack: Java (8/11/17), Spring (Core, Boot, Data, Security), Hibernate, JPA, REST APIs, Microservices, Docker, Kubernetes, Jenkins, Oracle DB, SQL Server, WebLogic, Tomcat, uDeploy.
- IBMJava Web LeadJanuary 2015 - January 2016 (1 year)• •• •• •• • Complete UML modeling of complex enterprise systems and integrations. Systematic management of software requirements and traceability using Rational. Stack: Java, Spring, SOA, WebSphere, Rational, Complete UML modeling.
- Cassette DigitalTech LeadJanuary 2015 - January 2015• • MVC. Direct technical integration of the backend web system with Obolous ATMs, ensuring operational stability.
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Education
- Scrum (Scrum Master), Six Sigma, Information Security, Software Audits, Quality Assurance (QA) Control.Scrum (Scrum Master), Six Sigma, Seguridad Informática, Auditorías de Software, Control de Aseguramiento de Calidad (QA).
- Software Development EngineeringTecMilenio University2012Ingeniería en Desarrollo de Software
Certifications
- AWS Certified Solutions Architect - AssociateAmazon Web Services (AWS)2025
- Administration and Optimization of Relational Databases (SQL Server / Oracle)Microsoft Certified: Azure Database Administrator2026