Hello, I'm David. I'm a
Linux Systems Engineer
who loves building awesomeness
Hire Me

15

high-tech companies

65

successful projects

100%

linux servers

20

software languages

17

automation tools

Development Expertise

Automated Networks

I promote company objectives through security policies. I deliver efficiency and cost-effectiveness. I automate so you're always up and responsive.

Systems Integration

I have a rich history of interoperability, migrations, low-level programming, reverse engineering, and technical documentation.

Software Development

I'm an expert Linux systems programmer with 15+ years of experience. I deliver excellence. I engineer high performance and high availability.

Project Consulting Services

Free Consultations

I work with you to determine the technology of your project by helping you come up with a list of your project's capabilities and a list of your project's requirements. I give you a detailed breakdown, step-by-step of what's involved to complete your project. I work with you to draft a guaranteed plan that delivers your project in time and on budget. I guarantee to complete your project by a fixed hourly rate per a maximum number of hours.

Prototypes

I use your list of your project's capabilities and your list of your project's requirements to build a system of separated network services in a isolated local network within a testing environment. I ensure this system satisfies your project's basic requirements via QA testing. In this special environment components of your project are glued together using shell scripts, process scheduling, and common tooling.

Minimum Viable Product

I use your project's prototypes to build a system of integrated network services in a production-like network within a development environment. I prove this system represents proof of concept with the minimum features to satisfy your project's capabilities and your project's requirements via QA testing. I ensure your system is operational, but it may need further customization to be ready for your production environment.

Final Product

I use your project's minimum viable product to build a system of integrated network services that's operational and ready for your end-users. I ensure this system has been customized for the needs of your production environment. I prove the features of this system satisfies your project's capabilities and your project's requirements via QA testing and independent verification.

History of Project Delivery

  • Be Part
    Of My
    Story!

  • Jan 2016 – Present

    DeepSentry.com

    Engineered a HTTPS/TLS REST-API of microservices in Golang with PostgreSQL for intelligent managed security that remotely enforces right behaviors to prevent 0-day attacks.
    Read more

  • May 2016 – Nov 2017

    DevOpsBuilder.com

    Engineered custom CI/CD pipelines, automated virtual appliances, and test-automation platforms, via independent consulting services.
    Read more

  • Sep 2015 – Dec 2015

    Time Warner Cable

    Led black-box testing of OpenStack Swift in data centers nationwide for migration of OpenStack Kilo to OpenStack Liberty.
    Read more

  • Mar 2015 – Sep 2015

    CenturyLink

    Engineered bare-metal cloud platforms for on-demand, high performance telco microservices based on SDN and NFV using an OpenStack ecosystem of Open Source software.
    Read more

  • Jun 2013 – Dec 2014

    Ramsey Grant Brenner & Co, Inc. dba OSDisc.com, NuevoCloud.com, and others

    Engineered network operations for five e-commerce companies, OSDisc.com and NuevoCloud.com and three upcoming companies, compliant with PCI DSS 2-3.
    Read more

  • Aug 2012 – Aug 2012

    Ramsey Grant Brenner & Co, Inc. dba OSDisc.com and others

    Engineered a fully automated virtual security appliance based on FreeBSD and Open Source software, critical to PCI DSS 2 compliance.
    Read more

  • Apr 2011 – Nov 2012

    ResolveBug.com

    Engineered a small international business that provided on-demand engineering of Linux servers with Open Source software via both same-day emails and remote administration.
    Read more

  • Mar 2010 – Feb 2013

    University of Colorado at Denver

    Engineered network operations for cloud of virtual servers and multimedia desktops based on Linux and Open Source software; compliant with UCD IT Policies, Modern Languages Lab Policies.
    Read more

  • Jan 2010 – Dec 2010

    Ramsey Grant Brenner & Co, Inc. dba OSDisc.com

    Engineered another first to market product that involved reverse-engineering similar technology found in Open Source software: Live Linux with Integrated Read-Write Storage.
    Read more

  • Jan 2009 – Dec 2009

    Ramsey Grant Brenner & Co, Inc. dba OSDisc.com

    Engineered a first to market product that involved reverse-engineering similar technology found in Open Source software: Software Repositories on CD/DVD Media.
    Read more

  • Aug 2005 – Jan 2008

    Ramsey Grant Brenner & Co, Inc. dba OSDisc.com

    Engineered resolution of systems integration issues of bleeding-edge and cutting-edge Open Source technologies in Linux, BSD, Solaris.
    Read more

100% Code Ownership

2009

Search-Strings
Combinatorics Engine

Returns every possible combination of list of subjects and their components according to list of requirements, as search-strings for Google, Yahoo, AOL, MSN.

Click here

2011–2012

Dynamic Knowledge Base
Web Portal

Determines statistical relevancy of keywords related to problems within collection; both keyword order and keyword position return results as links.

Click here

2011–2012

Authorize.net
Encrypted Checkout

Java servlet encrypts HTTP 1.1 session data over HTTPS-TLS as AES 256-bit file then responds with credit card payment form hosted on Authorize.net.

Click here

2012–2016

DeepSentry Security
Application Software

Cyber security intelligent agent developed in C as application software that uses machine learning to remotely enforce the right behaviors of users and services.

Click here

Awesome Technical Skills

Code Development

AngularJS, Bash, Bootstrap 3-4, C, C++, CLISP, CSS3, D3.js, Expect, Flot.js, Git, Golang, Gorilla, HTML5, Java, JavaScript, Jenkins, Jinja2, jQuery, JUnit, LESS, Lua, Node.js, Perl, PHP5, Prolog, PyTest, Python3, R, Ruby, Rust, Scheme, Selenium 2.0, PLPGSQL, SVN, TestNG, Valgrind

Automation Tools

Ansible, Bash, Cobbler, Expect, Icinga, Nagios, Perl5, Puppet, PXE Booting, Python3, Ruby, SuperMicro Server Manager, Vagrant

Big Data Platforms

Amazon Cloud (AWSCLI, AWSConfig, CloudFormation, Cognito Identity, DynamoDB, EC2, ElasticCache, Elastic Beanstalk, ELB, Glacier, Kinesis Streams, IAM, OpsWorks, RDS, Route53, S3, SMQ, VPC, WAF), OpenStack (Cinder, Glance, Heat, Ironic, Neutron, Keystone, Nova Compute, Swift)

Server Platforms

Apache HTTP Server, Apache Mesos, CentOS/RHEL, Cisco C-Series Rack Servers, Citrix XenServer, Debian, Docker, FreeBSD, Libvirt API, LXC, SuperMicro Blades, Ubuntu Server, VMware (ESXi, vCloud Director, vCenter Server Appliance)

System Messaging

Dovecot, Elasticsearch, Galera Cluster, Graphite, Kafka, Kibana, Memcached, MySQL, PostgreSQL, RabbitMQ, Redis, Rsyslog, Sendmail, SQLite3, Syslog-ng

SAN & NAS

Ceph, DRBD, FreeBSD-ZFS, GlusterFS GeoRep, iSCSI (IET, istgt), LVM, Multipath, NFS, Open-iSCSI, Proftpd, RAID, Rsync, SMB/CIFS, VMware (vSphere, vSAN), WebDAV

Network Security

GnuTLS, IPSec, IPtables/6, Nmap, OpenLDAP, OpenSSH, OpenSSL, OpenSwan, OpenVPN, OWASP, PCI DSS, Sagan, Samhain, SELinux, SNORT, StrongSwan

Network Routing

Arptables, BIND9, CAT2-6 Cabling, DHCPd, Ebtables, HAProxy, IPMIv1-2, IPRoute2 Policies, IPtables/6, Juniper SRX Services Gateways, Nginx, Open vSwitch, PGBouncer, SM/MM FC, SNMPd, TCPwrappers, Traffic Control (tc), Vconfig

Relevant Higher Education

Jan 2010 - Dec 2014

University of Colorado at Denver

Bachelor of Science, Business Administration & Information Technology, GPA 3.2/4.0, Academic Awards: 2Read more

Completed 8 courses in information technology

Completed 9 courses in business administration

Completed 7 courses in math and other

Jan 2008 - Jan 2010

Community College of Denver

Associate of Science, Business Administration & Information Technology, CCD's Phi Theta Kappa Honor Society, GPA 3.9/4.0, Academic Awards: 4Read more

Completed 10 courses in information technology

Completed 3 courses in business administration

Completed 8 courses in math and other

Read my blog

Sample my engineering techniques and engineering guides. Read about current trends in high performance. Learn how to engineer a VMware vSAN. Learn about continuous integration best practices. Learn the how to of secure Linux programming. Understand the uses of Big-O notation. And more!

Contact Me