Open to opportunities

Efraín Sebastian Rojas Artaviabuilding software.

Software Engineering student passionate about networking, automation, web development, data analysis, and cybersecurity. Based in Atenas, Costa Rica.

11+
projects
4
spoken langs
2
years exp.
What I work with
Technical Skills
Built from scratch
Projects
🌐
IT Service Portal
Full-stack web app built with Next.js and SQL to manage internal IT tickets, with role-based access and status tracking.
Next.js React SQL
🗄️
Inventory DB System
Relational database system for warehouse management with stored procedures, triggers and a React web interface.
SQL React DB Design
📈
Data Science Fundamentals
Repository with all the modules of the Data Science Fundamentals course.
Data Science Python Data Analysis
📚
APA7 Reference Generator
Generates APA 7 references from URLs and PDFs, reading page and document metadata directly in the browser. Also ships as a Python package with a CLI.
Python JavaScript pdf.js
🌦️
Rumbo — Weather & Currency
Travel companion web app showing real-time weather for any destination and converting your money to the local currency, with a map view and saved trips.
Weather API Currency Exchange JavaScript
🧹
Table Cleaner
Python tool that detects and fixes data quality issues (missing values, duplicates, invalid types, outliers) in CSV/Excel/SQL data, with automatic quality reports. Ships with 6 interfaces: interactive CLI, CLI flags, Streamlit web app, desktop (Tkinter), FastAPI and Jupyter notebook.
Python Streamlit Data Quality
🗡️
Dungeon Explorer
Text-based dungeon crawler in C# with turn-based combat, inventory, level system and multiple enemy types.
C# .NET OOP
🏦
Banking System
Console banking system in Java with account management, deposits, withdrawals, transfers and full transaction history.
Java OOP Collections
⚡
System Monitor
Lightweight real-time system monitor in C showing CPU, memory and disk usage with color-coded bars and threshold alerts.
C Linux/Windows Systems
📊
Inventory Automator
Python application that automates data processing and report generation, with interactive dashboards for monitoring and analysis.
Python Streamlit Dashboards
🔍
Log Analyzer Script
Python CLI tool that parses network device logs, detects anomalies and sends alerts via email when thresholds are exceeded.
Python Networking Automation
🤖
Invoice Automation Bot
Python bot that extracts invoice data from PDFs, validates it and uploads it to a management system, reducing manual processing by ~80%.
Python PDF Processing Automation
🍲
Recetario — Recipe Finder
Web app to search recipes by name, category or region, follow the step-by-step instructions and save your favorites, powered by TheMealDB.
JavaScript TheMealDB API Web App
📑
DocuChat
Chatbot that answers questions about your own documents, using retrieval-augmented techniques to ground its responses in the uploaded content.
JavaScript RAG AI Chatbot
Where I've worked
Experience
🌐
NOC Technician
Vocex
Oct 2025 – Jan 2026 · San José, CR
  • Network infrastructure monitoring with Zabbix, OLT and routers
  • Incident detection, analysis and escalation to L2/L3 support
  • Ticket management and performance report generation
🏭
Production Operator I
Confluent Medical
Jan 2025 – Sep 2025 · Alajuela, CR
  • Operated equipment in cleanroom under ISO standards
  • Maintained detailed reports on production deviations
  • Collaborated in continuous improvement projects
Communication
Languages
🇨🇷
Spanish
Native
🇺🇸
English
B2 — Upper-Intermediate
🇧🇷
Portuguese
Basic
🇯🇵
Japanese
Basic
Background
Education & Certifications
⭐ Full Credly profile 🪟 Full Microsoft Learn profile
🎓
Software Engineering
Universidad Estatal a Distancia — UNED
2025 – Present · Atenas, Alajuela, CR
📋
Technical Diploma in Information Technology
Universidad Estatal a Distancia — UNED
2023 – 2025
📄 View Diploma
🏫
High School Diploma
Liceo de Atenas
2014 – 2018
📄 View Diploma
🖥️
Designing Cisco UCS X-Series for AI (DCUCSX)
Cisco U.
August 2026 · AI-ready data center infrastructure design on the Cisco UCS X-Series platform
⭐ View Certificate
🧠
Cisco Splunk for AI Operations (CAIOP)
Cisco U.
August 2026 · Using Splunk to monitor, analyze and operate AI workloads and infrastructure
⭐ View Certificate
🤖
UiPath RPA Automation Semester — Certificate of Achievement
UiPath Community · Dream to Succeed Foundation
2025 · 80 hours · AI Agentic Automation RPA Program
⭐ View Certificate
☁️
Google Cloud Cybersecurity Certificate
Google Cloud
2026 · Cloud security, IAM, threat detection, incident response
⭐ View Badge
☁️
Google Cloud Computing Foundations Certificate
Google Cloud
June 2026 · Cloud infrastructure, BigQuery, Compute Engine, IAM
⭐ View Badge
🛡️
Junior Cybersecurity Analyst Career Path
Cisco
July 2026 · Application security, cloud security, firewalls, access control, network hardening, defense in depth, endpoint protection, threat mitigation, Windows/Linux security, WLAN security and IP/TCP/UDP vulnerabilities
⭐ View Badge
⚠️
Cyber Threat Management
Cisco
July 2026 · Threat modeling, risk management, incident response planning, vulnerability assessment and cybersecurity governance frameworks
⭐ View Badge
🔥
Network Defense
Cisco
July 2026 · Network defense strategies, IDS/IPS, access control, firewall administration, traffic analysis and network security monitoring
⭐ View Badge
🔧
Network Technician Career Path
Cisco
July 2026 · Installation, configuration, troubleshooting and support of LAN/WAN networks; formally validates hands-on NOC and infrastructure experience
⭐ View Badge
🔐
Introduction to Cybersecurity
Cisco
July 2026 · Cybersecurity fundamentals: attack types, defense strategies, personal and organizational data protection, and security career paths
⭐ View Badge
📡
Networking Basics
Cisco
July 2026 · TCP/IP networking fundamentals, IP addressing, network protocols, media types and basic network device configuration
⭐ View Badge
📈
Data Analytics Essentials
Cisco
July 2026 · Data analysis, visualization, data storytelling and dashboard design. Tools: Tableau, Excel and SQL for end-to-end analytics workflows
⭐ View Badge
🛡️
Cybersecurity Defense Analyst Career Path
Cisco · Splunk
2026 · Cybersecurity threat landscape, SOC operations, SIEM with Splunk, investigation, hunting, and incident response workflows. 30 hours of learning
⭐ View Badge
🕵️
Ethical Hacker
Cisco
2026 · Legal and compliance requirements, scoping and executing vulnerability assessments, reporting and mitigation strategies. 34 hands-on activities using Kali Linux, WebSploit and other tools
⭐ View Badge
🐧
Linux Essentials
Cisco · NDG
2026 · Open vs closed source, Linux OS components, command line usage, file management, backups, system security, user/group permissions and simple scripting. 24 hands-on labs on a real Linux VM
⭐ View Badge
📊
Microsoft Power BI — Data Analyst Path
Microsoft Learn
2026 · Data preparation, data modeling, DAX, report design and administration/security in Power BI · 5 courses
🔷
Microsoft Azure — Cloud & DevOps Path
Microsoft Learn
2026 · Cloud concepts, Azure architecture, governance, storage security, Enterprise DevOps and architect design fundamentals · 6 courses
💻
Web & Programming Essentials
Cisco · OpenEDG
2026 · Core syntax, OOP and problem-solving across HTML, CSS, JavaScript, Python and C++ · 8 courses
🔬
Semiconductor Packaging — Beginner Specialization
Arizona State University · Coursera
2026 · Materials science, electrical properties of semiconductors, cleanroom fundamentals and semiconductor package anatomy, types and reliability · 4 courses
🎙️
Certificate of Achievement — Podcast Production Workshop
Educación a Distancia CR · June 2026
🎧 Listen to published episode
⭐ View Certificate
Let's talk
Get in touch
✉️ efrabuild@outlook.com 📱 +506 8890-2804 🐙 github.com/efrabuilder 💬 Contact form 📄 CV English 📄 CV Español