I'm a backend web developer with strong proficiency in Go and about five years of experience, both professional and academic. I work as an intermediate software engineer at PersonalSoft, building Go microservices, and I'm finishing a degree in Software Development and Digital Business Engineering at ESEN.
I have deployed applications on several cloud providers, and I use Git, GitHub and CI/CD pipelines to ship them. I write down what I learn along the way on this site.
Experience
PersonalSoft: Intermediate Software Engineer
2026-08 – present
I work as a mid-level backend software engineer specialized in Go.
- Developed high-performance microservices for the credit integrations team at Grupo Unicomer.
- Refactored Go components to reduce technical debt and improve system efficiency.
- Implemented GitOps and CI/CD practices to deliver high-quality products on time.
- Worked with high-performing teams, putting customer value first in every decision.
Bancoagrícola: Observability Engineering Intern
2026-01 – 2026-04
- Automated observability ingestion with Microsoft Power Apps and Power Automate, reducing operational response times by 30%.
- Designed data reports that filtered out unused alerts in the IT department, cutting total alert volume by 20% and improving threshold accuracy.
- Designed and implemented observability solutions with Dynatrace, Zabbix and Grafana to monitor complex banking architectures in an Agile environment.
Altempo: Full-stack Engineer
2025-08 – 2025-12
- Led the development and deployment of the musician's dashboard and the administrative system of the Altempo platform.
- Designed scalable solutions for a web platform used by hundreds of users during its initial validation stage.
- Mapped and built features for different stakeholders, from musician and client needs to administrative needs and non-functional requirements.
- Proposed and led an agile team focused on shipping fast and on continuous product improvement and validation, with a strong emphasis on communication and requirements validation.
Education
ESEN: Software Development and Digital Business Engineering
2023-01 – 2027-01 (expected), La Libertad, El Salvador
- Ricardo Poma Scholarship: highest GPA in the program (9.6/10), 2026-01.
- Rector's Scholarship for Academic Excellence: highest GPA in the program (9.5/10), 2025-01.
- Admission Exam Scholarship: highest score of the year, 2023-01.
Certifications and courses
- AWS Educate Introduction to Cloud 101, 2024-09. Core cloud infrastructure concepts, cost optimization and service deployment on AWS. Certificate.
- Build Go Apps That Scale on AWS (Frontend Masters), 2024-09. Application development with AWS CDK, the full workflow of a Go application, and a working JWT login system on AWS Lambda.
- TOEFL, 2023-03. Score: 115/120.
Contact
The best way to reach me is email: fernandocastillo.8@hotmail.com.