Randall Hogan, Full-stack Developer in Fort Worth, TX, United States
Randall Hogan

Full-stack Developer in Fort Worth, TX, United States

Member since February 9, 2022
Randall has 20+ years of software engineering experience with two of the top Fortune 100 companies in the world. His expertise ranges from sophisticated network and process automation to real-time data collection and wrangling to rapid data access with complex filtering schemes to top-performing interactive web interfaces. He has been an innovative full-stack solutions provider solving some of the networking industry's most difficult challenges with automation and performant user interfaces.
Randall is now available for hire

Portfolio

  • Citigroup
    React, React Redux, Node.js, Jira, Git, SQL, JavaScript, Java, REST, CSS...
  • Freelance for Jerky
    React Redux, React, Redux Form, JavaScript, HTML, CSS, Bootstrap...
  • ExxonMobil
    JavaScript, HTML, CSS, Perl, Angular, SQL, DevOps, Networking, Web UI Design...

Experience

Location

Fort Worth, TX, United States

Availability

Part-time

Preferred Environment

Jira, React, Git, SQL, Node.js, VS Code, MacOS, Windows, Linux, Agile DevOps

The most amazing...

...project I've developed is a top-performing automated network device upgrade process from execution to real-time data collection to interactive web dashboard.

Employment

  • Senior Lead Full-stack Developer

    2017 - PRESENT
    Citigroup
    • Led a team of 11 developers comprising of junior, mid-level and senior developers. Ran the daily standups, assigned work, provided design guidelines, code reviews, and training, and assisted pair programming as needed.
    • Developed a centralized web portal with a React front end and Node.js back end, pulling all the disparate network data from diverse applications into a centralized web portal for rapid access to critical data.
    • Built a fully automated end-to-end network device upgrade process from execution to data collection and wrangling to rapid data access via a Node.js REST API to an interactive and performant React front-end dashboard and management pages.
    • Created a rapid configuration Regex search ending using Node.js to develop the search engines, Node.js REST APIs for data access, and a React web front end for managing searches and search results.
    Technologies: React, React Redux, Node.js, Jira, Git, SQL, JavaScript, Java, REST, CSS, HTML, Bootstrap, Regex, DevOps, Networking, Web UI Design, GitHub, Agile, MongoDB, Full-stack, Web Development, Redux, REST APIs, RESTful APIs, MUI (Material UI), Firebase, HTML5, HTML UI, HTML DOM, APIs, Leads, Express.js, Remote Team Leadership, Team Leadership, Back-end, Front-end Development, Back-end Development, API Integration, TypeScript
  • React Web Developer

    2017 - 2019
    Freelance for Jerky
    • Delivered a dynamic web report dashboard to show month-over-month progress in sales over the last five years.
    • Developed the pages for managing the automated distribution of monthly Jerky subscription orders.
    • Created management pages for managing user profiles and management roles.
    • Developed a page for users to maintain their accounts and preferences.
    Technologies: React Redux, React, Redux Form, JavaScript, HTML, CSS, Bootstrap, Web UI Design, GitHub, Agile, MongoDB, Web Development, Redux, REST APIs, RESTful APIs, HTML UI, HTML DOM, APIs, Front-end, Express.js, Front-end Development, API Integration
  • Network Software Engineer

    2011 - 2017
    ExxonMobil
    • Automated most level 1 network operations such as circuit and power outages, opening tickets with vendors, and managing outage status communication and escalations.
    • Developed a web portal view into all our disparate network data dispersed over multiple applications with rapid access to data and the ability to interact with various applications without having to leave the centralized web portal.
    • Automated lockdown of new network devices and remediation of device configurations when they would fail policy compliance checks.
    • Created an automated config generator that would take minimal user input via a web interface and generate all configurations needed to fully deploy a new site.
    Technologies: JavaScript, HTML, CSS, Perl, Angular, SQL, DevOps, Networking, Web UI Design, Agile, Web Development, HTML UI, HTML DOM, Leads, Front-end, Back-end, Front-end Development, Back-end Development
  • Senior Network Automation Engineer

    2001 - 2011
    Citigroup
    • Developed and maintained the automated load balancer configuration generators for managing all user VIP/WIP requests.
    • Developed and maintained an automated interactive network configuration change routine. Live script interacted with the engineer to manage full pre-change routine, change routine, and post-change routine with diffs logging and alerts.
    • Developed and maintained various device automation scripts for deploying configuration changes and investigating issues across the entire global enterprise network population.
    Technologies: Perl, VBScript, PHP, Cisco, F5 Networks, Citrix, SQL, Riverbed, Networking, Front-end

Experience

  • React Web Portal for Network Device Information

    Developed a React front-end web portal with a Node.js back end to provide rapid centralized access to disparate network data sources. Each page on the front end loads in under a second and provides the user the capability to real-time search all fields as they type, combined with sorting and complex regex multi-column filtering, all with two seconds or less response time. The result sets can then be actioned for automated change creation, incident creation, and project creation.

  • Automated Network Upgrade Process

    The project was to develop a fully automated network device upgrade process capable of upgrading up to 15,000 devices in a 24-hour window without causing outages. This was a team project where I was both team lead and key contributor. My key contributions were developing the auto-execution engine, the REST APIs for access, and the front-end dashboard and management pages.

    The execution engine starts the upgrades according to a predefined schedule and then monitors the task status and determines when to start new devices optimally, restart the devices that have issues, or remove the devices from maintenance mode when they are completed. The execution engine interfaces with the network automation tool to start and stop upgrade scripts as needed.

    The Node.js REST APIs allowed performant access to the data collected near real-time upgrade process. This allowed users to update and action the data as needed, with updates taking effect immediately for other users to see and action accordingly.

    Finally, I developed an interactive React dashboard to provide monitoring and near-realtime actionable data with drill-down management pages for more information and to trigger automated actions as needed.

  • Rapid Network Configuration Search Engine

    One critical challenge for large networks is performing a complex Regex search of all network configurations quickly. Tools are even considered performant if they complete a config search in less than an hour. In operations, this can cause costly delays in accessing critical data.

    I developed a solution for a full Regex search with multiple and/or conditions against 50,000+ network configurations to be completed in ten seconds or less on average. Leveraging Node.js on the back end. The service distributes the search load over several processors, so each worker searches less than 10,000 configurations at a time. Each worker retrieves and optimizes their own configs for rapid searching, and the service manager then maintains a compiled cache of all the search results.

    The service leverages two load-balanced servers which keep their cache in sync. The REST APIs serving the front end also maintain a cache, keeping the load off the search engine while keeping their cache current and in sync. Finally, the intuitive and responsive React Web UI provides the users an interface to perform searches and leverage results into various automated actions such as creating projects, changes, or incidents.

Skills

  • Languages

    SQL, Perl, CSS, VBScript, JavaScript, HTML, Regex, HTML5, Java, PHP, TypeScript
  • Frameworks

    Bootstrap, Redux, Express.js, Angular, MUI (Material UI)
  • Libraries/APIs

    React, Node.js, React Redux, REST APIs, Redux Form
  • Paradigms

    Agile, Web UI Design, DevOps, REST, HTML DOM, Management
  • Other

    Cisco, Networking, Agile DevOps, Full-stack, Web Development, HTML UI, Front-end, Back-end, Front-end Development, Back-end Development, F5 Networks, RESTful APIs, APIs, Leads, Remote Team Leadership, Team Leadership, API Integration, Riverbed, Web UI, Data Wrangling, Agile Sprints
  • Tools

    Jira, GitHub, Git, VS Code
  • Platforms

    Windows, Linux, Citrix, Firebase, MacOS, Web
  • Storage

    MongoDB

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