Alejandro Carvajal
Coral Springs,FL
Summary
Full-Stack Software Engineer with 7+ years of experience building enterprise web platforms across financial, tax, pharma, energy, and gastronomical domains. Strong in Angular (JS & 2+), Java / Spring Boot, and .NET 6/C#, designing and implementing REST APIs, authentication flows, and modular SPAs in n-tier and microservice architectures. Hands-on with SQL Server, Entity Framework, C# endpoints, and Java microservices, plus cloud-oriented practices, CI/CD, and observability with Splunk. Comfortable owning features end-to-end: from UI and API contracts to persistence, performance, and production debugging.
Overview
4
4
years of professional experience
4
4
Certifications
Work History
Software Engineer – Full-Stack (Angular / .NET)
Electronic Tax Systems (ETSI)
Remote
02.2025 - 09.2025
- Developed and maintained full-stack enterprise tax and exemption applications using AngularJS, Angular 17+, C#, .NET 6, and SQL Server for large telecom clients such as T-Mobile.
- Designed and implemented reusable REST APIs with JWT-based authentication and role-based access control, improving security and simplifying frontend integration across multiple apps.
- Built backend features in C# / Entity Framework Core for dynamic configuration management, user permissions, and secure token handling, integrating with existing n-tier services.
- Led front-end modernization by refactoring legacy AngularJS modules into modular Angular components, abstracting modal logic and improving testability and maintainability.
- Collaborated in Agile sprints, resolving 100+ tickets, and supported CI/CD pipelines with Git and Azure DevOps for frequent, reliable deployments.
Software Engineer III – Full-Stack Angular / Java
Fiserv
Coral Springs, Florida
04.2023 - 01.2024
- Led design and development of a multi-modular Angular 16/17 SPA acting as a configuration and management console for a fraud-prevention engine consuming a monolithic Java 8 application.
- Provided ongoing support for a Java microservice using Spring Boot, creating and debugging DTOs, mappers, controllers, and services to ensure correct data flows to the UI.
- Implemented extensive unit tests (Jasmine, Karma) under a test-driven mandate, improving security posture and supporting clean vulnerability scans.
- Used RxJS and NgRx for state management, making data flow more predictable and simplifying complex UI behavior.
- Performed security audits and single-handedly upgraded the app from Angular 12 to 16 progressively to address deployment vulnerabilities and improve performance.
- Integrated PrimeNG & Angular Material and optimized lazy loading to ensure responsive UX under heavy data workloads.
Lead Frontend Engineer (Angular / Auth / Docker)
Frontera Ingenieria
Remote
11.2022 - 04.2023
- Led the UI platform for the National Energy Commission of Chile, enabling real-time national energy balance calculations with live data from smart meters.
- Designed and implemented a robust authentication ecosystem with Angular 14 + JWT, integrating with a NiFi Jetty backend and adding Auth0 SSO as a modern alternative.
- Implemented CORS mitigation via NGINX and environment-based configuration to support multiple deployment environments securely.
- Architected two multi-modular Angular applications with route guards, interceptors, and clean separation of static vs. reusable components, deployed via Docker and integrated with Jenkins pipelines.
Web Developer – Full-Stack (Angular / C# / SQL Ser
Yuxi Global
Remote
02.2022 - 04.2023
- Contributed to “Grant Plan”, a global platform for pharma giant IQVIA to estimate lab study costs.
- Implemented Keycloak SSO in an Angular 8 ecosystem spanning 5 micro-frontend apps, handling token validation and secure session flows.
- Designed and maintained C# / ASP.NET Core endpoints with Entity Framework, handling RESTful JSON/XML requests and responses and supporting a long-running server for Angular clients.
- Developed and optimized SQL Server stored procedures to encapsulate heavy queries and improve performance.
- Built complex reactive forms, custom validators, and error-handling patterns in Angular to ensure data integrity and robust UX.
- Delivered features over 20+ sprints within a strict Scrum process.
Frontend Developer (React / Angular)
Valid
Remote
09.2021 - 02.2022
- Built an administrative console for gastronomic client Takami, enabling subsidiaries to manage pricing, inventory, deliveries, orders, reservations, and online purchases.
- Developed a React 17 admin experience with dynamic shopping cart logic, price calculations, and form workflows.
- Consumed REST APIs via JSON with Swagger-guided contracts and implemented reactive & template-driven Angular forms in related interfaces.
- Collaborated daily with QA, Backend, Cloud, and Design under Kanban to deliver iterative improvements.
Education
Bachelor of Science - Software Engineering
Instituto Universitario ITSA
Barranquilla, Colombia07-2022
Skills
Languages – JavaScript/TypeScript, Java 17, C#, HTML5, CSS3
Frontend – Angular 17, AngularJS, React, NgRx, RxJS, PrimeNG, Angular Material, Bootstrap, Jasmine, Karma
Backend – Java 17, Spring Boot, NET 6 / ASPNET Core, Nodejs, REST API design, DTOs, Controllers, Services, Entity Framework Core
Databases – SQL Server, MySQL, MongoDB, Mongoose
Auth & Security – JWT, Auth0, Keycloak, SAML 20, RBAC, HTTP interceptors, secure token handling, security audits, SSO patterns
DevOps & Tools – Git, Azure DevOps, Jenkins, Docker, Splunk, Jira, Swagger / OpenAPI, Postman, Linux CLI
Practices – TDD, BDD, Agile (Scrum, Kanban), modular architecture, refactoring, performance optimization
Certification
AWS Certified Cloud Practitioner (CCP) – 2024
Timeline
Software Engineer – Full-Stack (Angular / .NET)
Electronic Tax Systems (ETSI)
02.2025 - 09.2025
Software Engineer III – Full-Stack Angular / Java
Fiserv
04.2023 - 01.2024
Lead Frontend Engineer (Angular / Auth / Docker)
Frontera Ingenieria
11.2022 - 04.2023
Web Developer – Full-Stack (Angular / C# / SQL Ser
Yuxi Global
02.2022 - 04.2023
Frontend Developer (React / Angular)
Valid
09.2021 - 02.2022
Bachelor of Science - Software Engineering
Instituto Universitario ITSA