Hello, I'm

Nicolas Guevara (Tostti)

Software Engineer

React, Node.js, Python • Systems-Oriented Problem Solver.

Nicolas Guevara (Tostti)

About

I'm a software engineer with 5+ years of professional experience building web applications, internal tools, and automation solutions.

My primary expertise is in React, Node.js, and Python, but I'm equally comfortable working across application, infrastructure, and developer tooling layers. I enjoy understanding how systems work beneath their abstractions and using that knowledge to build reliable, maintainable software.

Throughout my career I've worked in web development, cybersecurity, enterprise software, and banking environments, progressing from technical support roles to engineering leadership positions. I'm driven by curiosity, learn quickly, and take ownership of problems from investigation through delivery.

Experience

  1. Avenga

    Córdoba, AR

    1. Senior Software Engineer

      Now

      Oct 2025 – Present

      Working with a banking customer to develop a modern enterprise banking platform. Responsible for building and maintaining the frontend design system, creating reusable UI components, and implementing AI-powered workflows and agent capabilities to improve development processes and team productivity.

      • JavaScript
      • TypeScript
      • React
      • Jest
      • Git
      • n8n
      • Claude
  2. Wazuh Inc.

    Remote

    1. Staff Software Engineer

      Jan 2024 – Oct 2025

      Led a team responsible for the development and maintenance of the Wazuh Dashboard, the web interface of the Wazuh platform. Provided technical leadership, reviewed code, coordinated delivery efforts, and contributed to architecture, testing, automation, and feature development while supporting a large open-source user community.

      • TypeScript
      • JavaScript
      • Python
      • React
      • Node.js
      • Jest
      • Git
      • GitHub Actions
      • Bash
      • Linux
      • Docker

    2. Software Engineer

      Sep 2022 – Jan 2024

      Contributed to the development of the Wazuh Dashboard, designing and implementing new features, improving software quality through automated testing, and collaborating across multiple repositories and services within the Wazuh ecosystem.

      • TypeScript
      • JavaScript
      • Python
      • React
      • Node.js
      • Jest
      • Git
      • Bash
      • Linux
      • Docker

    3. IT Security Engineer

      Apr 2022 – Sep 2022

      Helped customers deploy, configure, and troubleshoot Wazuh installations across diverse environments. Investigated complex technical issues, performed root cause analysis, and worked directly with users through support tickets, remote sessions, and community channels.

      • Python
      • Bash
      • Linux
      • Docker
      • Jira
  3. DXC Technology

    Remote

    1. Wintel Support Engineer

      Apr 2021 – Apr 2022

      Provided technical support and administration for Windows-based enterprise environments. Investigated and resolved infrastructure, system and user-related issues while working within established operational processes and service-level agreements.

      • Windows Server
      • Active Directory
      • PowerShell
      • Python
  4. Córdoba Hosting

    Córdoba, AR

    1. Full-Stack Engineer

      Jun 2018 – Apr 2021

      Developed custom web solutions for clients across multiple industries, working directly with stakeholders to translate business requirements into technical implementations. Built and maintained websites, business applications, integrations, and internal tools using a variety of frontend and backend technologies.

      • WordPress
      • PHP
      • HTML
      • CSS
      • jQuery
      • JavaScript
      • React
  5. Legislatura de la Provincia de Córdoba

    Córdoba, AR

    1. IT Support Technician

      Apr 2016 – May 2018

      Provided technical support for end users, workstations, printers, and network infrastructure across multiple government offices. Diagnosed and resolved hardware, software, and connectivity issues while assisting with equipment deployment and system maintenance.

      • Bash
      • Windows
      • Active Directory

Technologies

Frontend

  • React
  • TypeScript
  • JavaScript
  • HTML
  • CSS

Backend

  • Node.js
  • Python
  • Express.js

Databases

  • PostgreSQL
  • MongoDB
  • Redis
  • Prisma

DevOps & Infrastructure

  • Docker
  • Linux
  • Bash
  • GitHub Actions

Testing

  • Jest

Version Control

  • Git

AI & Automation

  • Claude
  • OpenAI
  • LangChain
  • Ollama
  • n8n

Get in Touch

Have a project in mind, want to collaborate, or just want to say hello? Fill out the form and I'll get back to you as soon as possible.