Leonel Alejandro García López

Backend Engineer with 6+ years of experience building robust, scalable systems using Python specialized in Python with a strong foundation in data engineering, API development, and system automation. Specialized in RESTful API design, data pipelines, and system automation with Django, FastAPI, and Flask. Proficient in DevOps tools (Docker, Kubernetes, CI/CD) and cloud integration. Adept at authentication workflows, microservices, and backend architecture.

Comfortable working cross-functionally with mobile or data teams to deliver secure, high-performance applications.

Software Developer

Katapulk LLC (Ecommerce) (Jan 2021 - Now)

-Collaborated with backend teams to integrate mobile services with REST APIs, Firebase, and RabbitMQ. 

-Automated CI/CD pipelines using GitLab for multi-platform deployment.

-Performed data analysis and feature tracking to inform backend optimization and improve UX.

-Built and integrated the .NET-based remittance service for secure in-app money transfers.

-Contributed to payment processing flows, including an exploratory integration with Stripe.

Python Backend Engineer

Technological University of Havana (Network Administration Center) (Jan 2021 - Apr 2025)

-Developed and maintained backend systems for the university portal using Django and FastAPI.

-Automated user identity synchronization from multiple registries into local LDAP.

-Designed and maintained CI/CD pipelines and monitoring dashboards with Docker, Kubernetes, Prometheus, and Grafana.

-Built API-based authentication workflows for guest researchers and temporary users.

Python Engineer

GoDjango LLC (Jan 2022 - Oct 2022)

-Developed secure backend services using Flask and GitHub Actions focused on secure data transfer.

-Created and published tfproto_client, a secure low level data transmission Python library (PyPI).

-Supported microservice communication and robust API infrastructure across projects.

Software Test Engineer

Skycoin (Jun 2019 - Sep 2019)

-Tested and improved cryptocurrency client libraries in Python and C++.

-Contributed to cross-platform blockchain wallet development in Go.

Projects

EgresoCOVID19 – COVID Recovery Monitoring Tool (Flutter frontend with Python-based backend integration)

-Developed a structured data capture tool used by medical staff to track recovery metrics.

-Designed secure local storage, form handling, and data export features for analysis.

-Project featured in a peer-reviewed public health journal:

"Aplicación EGRESO/COVID-19: una forma amigable de recopilar, almacenar y analizar datos de los pacientes", Revista Cubana de Higiene y Epidemiología, Vol. 59, 2022.

tfproto_client – Secure & Efficient RPC-style Socket Communication Library (Python, Cryptography, API Security)

-Published on PyPI a Python library enabling secure, low-level RPC-style communication via sockets.

-Designed for high-performance data transmission using custom serialization and encryption.

Bachelor in Computer Science - University of Havana (Sep 2016 - Dec 2021)

Member of the Software Engineering Department. Winner of the Innovation Week with the project "jamAR". Assistant professor in Mobile Development with Flutter and Programming.