Author Image

Hello! I am David

David Chandler

Offensive Security Engineer at Emerson

I am an enthusiastic Offensive Security Engineer with 3 years of working experience in the technology industry. I spend most of my free time working on developing my cyber security and software skills. Currently I am on a offensive security certification learning journey. Sometimes I create fun projects with friends!

Certified CompTIA Security+ CE
Dependability
Team Collaboration
Critical Thinking
Leadership

Skills

Python 3 Development
Python 3 Development

Utilized as the main language for development in both personal and professional projects. Capable of writing testable and maintainable projects, alongside quick automation scripts to make life easier.

Structured Query Language
Structured Query Language

Quite familiar with SQL, used in personal projects alongside supporting company applications for development and end user issues/reporting. Majority of my experience is in T-SQL specifically.

Git Version Control
Git Version Control

Most comfortable with git-based development. Experienced in working in GitHub utilizing the GitHub supercharged workflow (CI/CD with GitHub Actions).

Application Security Testing
Application Security Testing

Personal and professional experience testing the security of applications. Finding bugs and vulnerabilities via site walking, scanning, and fuzzing, utilizing tools such as BurpSuite to make this process easier.

Cyber Security
Cyber Security

CompTIA Sec+ Certified giving me core knowledge in Cryptography, Data Security, Threat Analysis, and more. I also spend free time learning or playing CTFs via TryHackMe or HackTheBox.

Virtualization Technology
Virtualization Technology

Experienced in working with virtualization. VMs, containers, networks, etc. Proficient using docker and docker-compose to orchestrate applications together as micro services.

Linux Operating System
Linux Operating System

Using as my daily driver operating system. Knowledgeable on writing bash/shell scripts for automation and configuration. Most experience in debian based distros.

Windows Operating System
Windows Operating System

Used professionally, versed in enterprise functionality such as Active Directory. Capable of writing PowerShell scripts for automation and configuration.

Mac Operating System
Mac Operating System

Utilized professionally when automating iOS mobile applications. A preferable option if cross platform development is in order, familiar with tools like XCode and coca-pods building mobile applications.

JavaScript Development
JavaScript Development

Comfortable reading and writing code, used in personal projects on the frontend with Vue and on the backend using express and websockets.

C Development
C Development

The first language I dabbled and experimented in. Most conversant in reading and reviewing code. A lot of C applications come up in security training.

C# Development
C# Development

Used in professional applications I have supported. Comfortable reading and reviewing code. Some usage in personal projects around security exploration.

Experiences

1
Emerson

September 2022 - Present, St. Louis, MO

Emerson has two focused business platforms, Automation Solutions and Commercial & Residential Solutions, which combines advanced technologies, industry-leading expertise and an insatiable curiosity about the world to create sustainable solutions for our customers.

Offensive Security Engineer

April 2023 - Present

  • Red Teaming
  • Purple Teaming
  • Penetration Testing
  • Hardware Security Assessments
  • Mobile Application Security Assessments
  • Threat Modeling
  • Consultation regarding vulnerabilities and exploit analysis.
Attack Surface and Vulnerability Management Security Analyst

September 2022 - April 2023

  • Managing perimeter security through continuous discovery, analysis, remediation and monitoring of the organization’s attack surface.
  • Writing Python scripts to pull data from 3rd party APIs for easier data analysis and reporting.
  • Creating visual reports based on attack surface findings.
IT Quality Assurance Analyst
QUES

October 2020 - September 2022, St. Louis, MO

QUES provides electric distribution, transmission and substation engineering, utility asset management, electric power project management and other ancillary utility infrastructure support services.

Responsibilities:
  • Developing T-SQL stored procedures and writing various scripts for supporting applications.
  • Writing and maintaining functional and UI automation tests.
  • Writing and maintaining an API load testing suite.
  • Lead QA tester on new applications, performing regression testing and feature testing.
  • Minor development work using Unity and Blender working with 3D modeling.
  • Collaborating with end users and internal team to identify and resolve data issues.
  • Working with developers by reviewing code and working through writing tests together.
  • Auditing application security in down time and reporting and remediating vulnerabilities.
2
3
Panera Bread

November 2017 - May 2020, St. Louis, MO

Panera Bread Company is an American chain store of bakery-café fast casual restaurants with over 2,000 locations, all of which are in the United States and Canada. I worked in the Fresh Dough Facility producing the bread for the cafés.

Production Lead

July 2019 - May 2020

  • Trained 10 new employees.
  • Trained to do the administration for the facility late 2019.
  • Oversaw 20 employees every day and was responsible for all bread produced.
Mixer

November 2017 - July 2019

  • Scaling ingredients to standard as per formulas.
  • Mixing the dough and making adjustments on the fly for any batches out of desired end product.
  • Follow safety protocols and FDA standards when working with machinery and cleaning equipment with allergens.
Lead Cook
Cusanelli's Restaurant

October 2015 - November 2017, St. Louis, MO

Cusanelli’s was an italian restaurant serving foods like pizza, steak, and pasta.

Responsibilities:
  • Preparing food and cooking it to customer satisfaction.
  • Training new employees on cooking.
  • Ensure station stayed cleaned and maintained during shift.
  • In late 2017 started training as a Kitchen Manager.
4

Projects

Game Role Attendant
Game Role Attendant
Contributor June 2022 - February 2023

A progressive web application to assist with role-based and hidden identity games. Created utilizing Quasar for the frontend, Node.js for the backend, and Redis for the database.

personal hobby
Star
Python API
Python API
Owner April 2022 - Present

An example API created with Python utilizing FastAPI. Working with new technologies such as docker and alembic for database migrations. The end goal is a containerized application with tests and CI/CD.

personal Stale WIP
Star
HTB Academy to Markdown
HTB Academy to Markdown
Owner April 2023 - April 2023

Simple CLI program that will fetch and convert a HackTheBox Academy module into a local file in Markdown format. This is my first application written in Go, and is pretty helpful if you are studying for the CPTS!

personal new
Star
Python Offensive Scripts
Python Offensive Scripts
Owner September 2021 - Present

A collection of offensive scripts written in Python. The collection features scripts for ARP spoofing, DNS spoofing, injecting code, and more! All uses for this repo are for ethical learning purposes only.

personal Stale WIP
Star
Hackerman in C
Hackerman in C
Owner September 2022 - Present

This program is sort of a joke between friends, and was originally written in Python by a buddy and turned into a “lets write this in more programming languages” type of challenge.

personal hobby
Star
Network Lab
Network Lab
Owner August 2022 - Present

Probably my most ambitious project yet, this project is for setting up a customizable VM lab to practice sys admin or offensive security activities. End goal is to also have a Terraform script for cloud formation.

personal hobby WIP
Star