alex@portfolio: ~

➜ whoami

Senior Rails Developer · Security Expert · AI Engineer

➜ ssh root@10.10.10.██ -i ~/.ssh/alex

root@pwned:~# cat proof.txt

Two decades of professional software development, with deep roots in Ruby on Rails and a persistent thread of security

through everything — full-stack builds, distributed team lead, zero-downtime migrations, payment-critical infra at PayPal.

Five years at Offensive Security — built the vulnerable machines tens of thousands of security students hacked through.

8,000+ hrs mentoring toward OSCP, OSCE, OSWE, and OSWP.

root@pwned:~# ls /opt/

ollama/

root@pwned:~# ollama run alex:latest "who built you?"

pulling manifest ████████████ 100%

Work Experience

  1. Senior Ruby On Rails Backend Developer / Ruby Team Lead-Manager

    Current

    BallastLane Applications

    Remote · April 2022 – Present

    • Led and mentored a Ruby development team, guiding architecture, enforcing coding standards, and supporting developer growth.
    • Improved team processes and collaboration, coordinated with stakeholders for continuous delivery, and drove innovation.
    • Actively contribute to the company's AI initiatives as a mentor, guiding developers in the effective and secure integration of AI and Large Language Models (LLMs), including practical application of the OWASP LLM Top 10 principles.
    • Upgraded applications and managed production deployments with minimal downtime, optimizing database indexing and query performance.
    • Migrated monolithic Paperclip file storage to ActiveStorage, added integration tests, streamlined storage, and reduced maintenance.
    • Executed complex Ruby (2.7.5 to 3.3.8) and Rails (5 to 7.2) migrations with minimal disruption.
    • Developed AWS Ruby Lambdas, integrated S3 with ActiveStorage, and deployed custom API endpoints on EC2 for scalable cloud operations.

  2. Entrepreneurship (Personal Project)

    Greyhat Chile

    Santiago, Chile / Worldwide · August 2018 – Present

    • Lead research and develop insightful content focusing on life, web technologies, work-life balance, and significantly, the integration and impact of Artificial Intelligence in modern applications.
    • Delivered Ruby on Rails solutions for client projects, including e-commerce and RESTful API integrations.
    • Increased RSpec test coverage from 65% to 90%, improving application reliability.
    • Mentored developers as a Ruby on Rails instructor and online tutor on coding best practices.

  3. Ruby on Rails Developer

    Taller Technologies / Braintree Venmo at PayPal

    Remote / US · July 2021 – December 2021

    • Developed new features for Braintree / Venmo payment applications using Ruby on Rails.
    • Utilized VIM/TMux, Pair Programming, and Python for automation in development workflows.

  4. Vulnerable Machine Engineer / Senior Student Administrator

    Offensive Security LTD

    Remote / Worldwide · February 2016 – June 2021

    Vulnerable Machine Engineer

    • Developed training applications in Ruby on Rails, ReactJS, Laravel, Java Spring, Django, and Node.js with PostgreSQL, MySQL, and MongoDB.
    • Managed AWS servers and provided remote lab administration for Linux, Unix, and Windows.
    • Researched and developed exploit/attack vectors in Python for cybersecurity training.

    Senior Student Administrator

    • Mentored over 8,000 hours, training students for OSCP, OSCE, OSWP, and OSWE certifications, focusing on hands-on techniques.
    • Offered guidance on offensive security methods, best practices, and problem-solving.

  5. Senior Software Engineer

    Bithaus Chile

    Santiago, Chile · July 2015 – January 2016

    • Maintained J2EE applications with PostgreSQL databases as a Senior Java Developer.
    • Administered Amazon EC2 servers and assisted with Datadog monitoring implementation.

  6. Founder / Entrepreneurship

    Alexertech of Alex B.

    Mérida, Venezuela · March 2008 – April 2015

    • Provided Full Stack Development and Training in Java, JSP, PHP, JavaScript, CSS, XML & XSLT, PostgreSQL, MySQL.
    • Developed a virtual classroom for IT Security and Software development courses for over 700 students, with automated student administration.