Lesly Toalongo portrait
Administrative Assistant

🟢 Open to work

Cybersecurity Enthusiast Specializing in IoT

I build and defend IoT infrastructures, mastering cyberattacks and defenses to safeguard technology in real-world applications.

Work samples

I showcase my work in cybersecurity, particularly in IoT defense, highlighting practical experiences and impactful projects.

  • Hydroficient IoT Cyber Defense Externship
    Hydroficient IoT Cyber Defense Externship
    Hydroficient logo

    Hydroficient · Sep 2026 · ✅ Verified by Extern

    Hydroficient IoT Cyber Defense Externship

    Build, hack, and defend real IoT infrastructure, then hand your security playbook to an actual company. You’ll launch realistic cyberattacks, from spoofing and replay attacks to unauthorized shutoffs, and implement defenses like TLS and mTLS.

    Top performerPython ProgrammingData AnalysisThreat ModelingDashboard Development

About me

I build and defend IoT infrastructures, mastering cyberattacks and defenses to safeguard technology in real-world applications.

I am a cybersecurity enthusiast currently deepening my skills in IoT infrastructure through an externship at Hydroficient. I enjoy tackling real-world security challenges and creating effective defenses against cyber threats.

Externships

Hydroficient IoT Cyber Defense Externship

Completed · Sep 2026

Experience

Administrative Assistant - Mary Schindler (Director of Programming)

Streb, Brooklyn, NY · Jul 2025

Paid Intern - Sindee Savage (Director of Community/Partnerships Growth), Ben Turner (Director of Web

V School, Remote, Salt Lake City UT · July 2024 - August 2024

Paid Intern - Georgia Papagianis (GXO Logistics)

Thred Up (The Workplace Challenge), Remote, NY · April 2023 - May 2023

Education

CUNY John Jay College of Criminal Justice

B.A. Computer Science & Information Technology · Class of 2026

Skills

CybersecurityIoT SecurityPenetration TestingNetwork DefenseTLSmTLSCommunicationCustomer ServiceCollaboration

✅ Verified by Extern

Hydroficient IoT Cyber Defense Externship

Build, hack, and defend real IoT infrastructure, then hand your security playbook to an actual company. You’ll launch realistic cyberattacks, from spoofing and replay attacks to unauthorized shutoffs, and implement defenses like TLS and mTLS.

Python ProgrammingData AnalysisThreat ModelingDashboard Development

Overview

The work analyzed a cloud-connected water-management system, mapped its data flows, and applied STRIDE to enumerate risks. Deliverables included a prioritized threat model, runnable Colab notebooks and exported sensor logs, captures of plaintext MQTT traffic, a TLS performance report, provisioning and revocation procedures, replay-defense experiment results, a live security dashboard, and an

Hydroficient IoT Cyber Defense Externship

What I've accomplished

I delivered a prioritized STRIDE threat model for a cloud-connected hotel water system; runnable Colab notebooks and exported JSON/Pandas-ready sensor logs with simulated anomalies; a capture of 17 plaintext MQTT messages; a TLS assessment showing a 0.60% latency overhead; documented mTLS provisioning and revocation; a 12-experiment replay-defense report proving combined defenses blocked all

Top performer

Project breakdown

View all work