Career Profile

25+ years experience on Linux/Unix server systems, inc RedHat & CentOS, especially high-speed / high-availability database & server applications rising to spend the ten years as CTO & Complex Systems Architect for the dot-IO domain registry.

Designing and developing complex wide-area network server systems incorporating public & private clouds, fixed and dial-up VPNs, multiple v4 & v6 Anycast networks, with GSLB load balancing and failover, on a hardened Linux operating system.

Extensive full-stack development experience "C", Python, shells script & Javascript. Developing secure full-stack webapps, XML & Rest api services from the ground up. Designing & implementing secure Linux based operating systems, from the kernel up. Extensive experience in the use of a wide range of open source packages, including building from source.

Contributed & credited in a range of open source packages, including various utilities as well as the Linux Kernel and Kernel Support (Kernel Bugzilla).

Write high quality documentation, blog posts and general reporting. Give clear & well structured online and public presentations supported by network & service architecture diagrams, suitable for both a technical audience and those less familiar with the subject matter.

A wide ranging understanding of IT and its uses with a talent for being able to explain complex concepts & architectures to C-suite / non-IT executives, so they can understand the decisions that need to be made.

Example Code

  • Javascript Rest/API WebApp
  • Python Operating System Management Scripts
  • Python Object Class Example
  • DNS over HTTPS, Python Flask Example
  • CentOS v8, Base Container
  • Experience

    Open Source Dev (Contract)

    Nov 2019 - Present (part-time / side-hustle)

    Lead Developer

  • Javascript single-page application for management of PowerDNS using its Rest/API
  • "DNS over HTTPS", Python / Flask app, containerised.
  • CentOS v8 base container for running Flask applications in production
  • Install & configure prometheus / graphana
  • Senior Linux Systems Engineer

    Jul 2018 - Nov 2019
    Large multinational B2B SaaS/PaaS Provider ServiceNow, London (UK)

    With a global private cloud of 1000s of servers, ServiceNow provides a PaaS for enterprise level ITIL compliant IT management used largely in the corporate and government markets.

    The Systems Engineering Team architect, maintain and run all the infrastructure services that support the ServiceNow application - e.g. email, DNS, authentication and server / VM infrastructure

    Role – Engineering Automation Developer / Subject Matter Expert for DNS

    Architect a complete refactor of the internal DNS, using python & rest/APIs to automate common tasks, and add malware filtering. Present proposals for approval to upper management and fully implement without any service interruption.

    Using Python and Rest/APIs, automate the teams ITIL change management submission and implement a full server / service validation / QA package, integrated with the ITIL system.

    Help build an IL4 (high security) data centre for use by US government agencies, ensuring FIPS-140 compliance for DNS services.

    Tech Skills: Linux (Centos / Redhat), networking, puppet, agile, ITIL, python, rest api, github / gerrit, DNS, DNSSEC, PowerDNS, "bind", vcenter / vmware, LDAP.

    Soft Skills: Documenting & presenting proposals, documentation for 24/7 teams, co-ordinating projects across multiple teams & time-zones, technical presentations (live & on-line)

    CTO, Lead Architect / Developer, Project Manager

    Oct 2006 - Jan 2018
    AC/SH/IO/TM ccTLD Domain Registry & CommunityDNS, London UK

    Dot-IO Domain registry was responsible for running and maintaining all domain names ending dot-IO, as well as those ending dot-AC, dot-SH and dot-TM. This involves running a full-stack registration / membership & renewal application, with an XML API, and all the necessary DNS infrastructure to ensure the domain names work 24/7/365

    The spin-off business “CommunityDNS” runs 6 anycast global DNS networks with h/a clusters in over 50 locations, to provide an attack resistant DNS publishing platform for ccTLDs.

    Lead Architect / Lead Developer / Project Manager - Domain Name Registry
    Design, write, implement and run (24/7) a full-stack domain name registration & DNS publishing service. Includes designing the hardened operating system platform, server infrastructure and all necessary backup & failover strategies at multiple data centres - London (x4), New York (x2) and Chicago (x2) linked by VPN.
    Backend: MySql, “C”, python, shell script
    Frontend: XML API written in “C” and three full-stack WebUIs for end-users, resellers and customer services (internal) - “C”, Javascript, python, HTML, CSS
    Skills: Linux, KVM, networking & VPN, MySQL, Open Source, “C”, shell script, python, HTML, CSS

    Lead Architect / Lead Developer / Project Manager – DNS Anycast Service
    Design, write, implement and run (24/7) an attack (esp D/DoS) resistant DNS publishing & reporting service using a hardened Linux O/S and hardened DNS Server.
    Skills: Linux, DNS, “C”, VPN, IPv4 / IPv6,

    Operating System Architect

    1996 - 2006
    Independent Linux Consultancy, London

    Designing secure, hardened, ultra-reliable custom Linux based operating systems for embedded applications, e.g routers, network storage, firewalls, web proxy cache & filter, content distribution for education.

    Sold and licensed Operating System designs and code to external vendors including 3-Com and ApplianSys

    Freelance Contractor

    1992 - 1996
    Various, London

    Mostly working with Sybase on Unix based system, especially Solaris, specialising in front-office trading systems for merchant banks. Clients included BNP Paribas (French Bank), Goldman Sachs, Sun Microsystems as well as various software vendors.

    Systems Developer - Database Vendor

    1990 - 1992
    InterSystems Corp, UK / Boston

    Covering in the EMEA territory from the office in the UK, but with frequent time spent working on technical issues at the head office in Cambridge MA. Providing technical backup for the front-line customer support staff.

    This includes analysing technical issues, fixing bugs and porting the product to new platforms. Accompanying sales and/or support staff on customer visits throughout the EMEA territory.

    Systems Developer - Accounting & Time-Costing Systems

    1988 - 1990
    Radius-CBSL, Cardiff

    Providing technical support and technical development services to teams of developers and customer support staff for SCO/Unix based Ingress accounting and time-costing system for SMEs.


    PowerDNS Managment - Architect, Project Lead & Lead Developer, 100% Javascript webapp talking to PowerDNS RestAPI for complete data managment, inc DNSSEC.
    TM Domain Registry - Architect, Project Lead & Lead Developer, Full-Stack Development. MySQL, C, python & shell-script backend to HTML/CSS/JavaScript frontend & XML/API
    CommunityDNS - Architect, Project Lead & Lead Developer, IPv4 & IPv6 Anycast DNS publishing & reporting system
    Technical Blog - A technical blog relating to the New Top Level Domains and Domain Name industry, but also including security issues and product specific information.
    SlimLinux - Cut down hardened Linux distribution, demo'ed as a DNS server - full operating system and application package is about 36Mb
    ApplianSys - Hardware vendor selling network appliance solutions based on my operating system design

    Skills & Proficiency

    Linux, Operating System design & security, scripting

    SQL Databases
    (MySQL, Sybase)

    Back-end Web, Apps & Security

    "C" Developer

    "Python" Developer

    Domain Names, DNS, DNSSEC, PowerDNS & Bind

    Firewalls, WANs, IPv4, IPv6, BGP, Load Balancing, Anycast

    Javascript, JSON, AJAX


    Social Media Marketing esp Twitter, SEO