Senior Sales Engineer

• Jul 2022 - Present

Staff Solutions Architect

• Apr 2020 - Jul 2022

Senior Solutions Architect

• Jan 2018 - Apr 2020

Senior DevOps Engineer

• Feb 2016 - Dec 2017

• DevOps lead for Authentication and Partner development teams. • Developed Kubernetes proof-of-concept clusters in AWS and Google Container Engine. • Developed internal micro-services. • Developed custom Ansible modules in Python to orchestrate our container scheduler stack. • Wrote monitoring plugins (Ruby) for various providers – Logmatic, DataDog, etc. • Developed serverless orchestration for Lambda / SAM deployments in Ansible and CloudFormation. • Created AWS staging environment and provisioning tool in Jenkins/Ansible/Cloudformation • Built out QA environment provisioning in Cloudformation, Ruby and Ansible providing a fully populated AWS QA environment with a dedicated Mesos cluster to developers in minutes. • Cloudflare CDN and AWS Cloudfront WAF integration. Show less

Senior DevOps Engineer

• Mar 2014 - Feb 2016

• Built and managed hundreds of Centos and Ubuntu VMs running Docker containers on a production VMWare ESXi cluster. • Built and managed instances running in an additional OpenStack cloud environment for QA / CI pipeline tasks. • Wrote the open source Tiller (http://github.com/markround/tiller) Docker configuration management tool. • Migrated a Puppet environment to Ansible and Jenkins for orchestration and automation, set up production monitoring and alerting platforms (Sensu; Nagios/Check_MK ; Redis, ELK & rsyslog for log aggregation across Docker containers and web endpoints). • Designed and deployed Docker platform providing services to 6 million set top boxes in the UK. • Managed MongoDB, Zookeeper and SolrCloud clusters across 3 datacentres. • Community lead for the “Build & Automation Guild” for teams across Sky Operations Engineering. Show less

Senior Systems Administrator

• Jun 2012 - Feb 2014

• Managed over 600 CentOS Linux servers and related infrastructure across multiple sites world-wide, providing 24/7 monitoring, load testing and performance analysis services. • Supported products based on Amazon AWS/VPC/EC2/RDS platforms. Developed Cloudformation templates to re-create stacks. • Supported systems as part of a regular on-call and escalation team. • Database administration across clustered and replicated Percona MySQL shards; MongoDB scale-out. • Developed Nagios/Cacti plugins, Cobbler and Kickstart profiles for all services and platforms. Set up ElasticSearch, Logstash and Kibana (ELK) stack for reporting. • Developed Puppet modules, manifests, ENC and related scripts in Ruby / Bash. • Lead DevOps for high performance “NoSQL” MongoDB/NginX/PHP product. • Designed and implemented multi-site, multi-carrier 10Gb/s high availability network design on Force10 and Cisco L3 switches and ASA firewalls, including inter-vendor OSPF, VLT, VLAN and LACP implementations. • Designed and built high-availability cross-site Percona MySQL cluster using NginX, HAproxy, Corosync/Pacemaker and PRM. • Managed Red Hat KVM and VMware ESXi virtualization platforms. Show less

Senior Systems Engineer

• 2011 - 2012

• Managed infrastructure for Location Based Services installed at mobile telecoms operators’ sites; typically around 40 Unix/Linux servers per installation, plus telecoms equipment (USSD gateways, GMLC/SMLC etc.) and supporting infrastructure (SAN storage, switches, load balancers and firewalls). • Installed and drove adoption of provisioning and configuration management system (Red Hat Spacewalk) in use across multiple sites and started virtualization project. • Responsible for the staging, performance testing lab and development systems running on ESXi. • Installed, configured and tuned Red Hat systems for use with a high availability system, using shared storage and cluster technologies. • 3rd-line support for infrastructure and LBS products/middleware running on a variety of Linux/Unix technology stacks including Apache, PHP, MySQL, Java, Jboss, Oracle and PostgreSQL. • Designed and planned infrastructure for new clients and LBS projects. • Provided technical support and training/mentoring to other systems engineers and developers, producing documentation, scripts and policies for the rest of the team. Show less

Systems Administrator

• 2008 - 2011

• Managed systems running a mixture of Solaris, Linux and FreeBSD providing web, database and infrastructure services. • Managed custom projects for clients, including creating highly available clustered physical hosts, and a global CDN system using Apache mod_proxy/mod_cache, running on top of Amazon AWS. • Implemented configuration management and software deployment systems (Capistrano, Puppet, Spacewalk), fault monitoring, reporting and metrics. • Supported web development team and assisted with scripting and development of integration projects. • Designed and implemented virtualisation platform for Linux and Solaris systems, incorporating an iSCSI SAN and a mix of Vmware ESXi and Citrix XenServer for the hypervisors. • Worked on backend Java integration projects. Created a web crawler/search system using Nutch, and worked with a top UK supermarket to create a single-sign on solution using JASIG CAS. Show less

Infrastructure Manager

• 2007 - 2008

• Managed a team of system administrators, software testers and documentation writers.• Designed and built web farm to host all IPC websites, with Linux and Solaris systems in a n-tier, redundant architecture. • Handled migration of Apache/PHP5 web tier from Solaris 10 to Red Hat Enterprise Linux, including server builds and policy. Integrated new build stack and version controlled RPM packaging for all software packages.• Implemented MySQL tuning and scale-out project (multi-master, multi-slave) on Solaris/Linux, and managed migration to the InnoDB storage engine, involving dedicated SAN infrastructure. Managed the Apache and web tier performance tuning and benchmarking projects, produced set of guidelines to be applied across all systems to support extreme load at peak times. Show less

Senior Systems Administrator

• 2005 - 2007

• Responsible for performance management and tuning across all tiers of the infrastructure.• Managed production and development infrastructure for all IPC’s online portfolio; responsible for all Solaris and Linux systems, standards and procedures. Developed automated build scripts and Jumpstart procedures to automatically install, patch and configure “bare metal” servers.• Managed legacy migration projects : Solaris 8 and 9 systems on SPARC to Solaris 10 Zones on AMD and CoolThreads SPARC T1 systems. Migrated from MySQL 3.x and 4.x to MySQL 4.1, PHP 4 to PHP 5, and Apache 1.3 to Apache 2.2.• Designed high-performance, scalable static content serving and content caching network (deployed on NME.com and other high-profile, heavy content sites such as Nuts.co.uk).• Managed two other sysadmins in my team. Show less

Systems Administrator

• 2003 - 2005

• Managed web and database platforms for IPC CALM (Country and Leisure Media) division of IPC, including Apache, PHP, MySQL and mod_perl systems running on Solaris, Debian Linux and FreeBSD.• Supported developers, created web-based internal tools, assisted with debugging and release management.• Managed datacenter migration project.

Systems Administrator

• 2001 - 2003

• Administered Solaris, AIX, FreeBSD and Debian servers. • Authored and maintained our corporate web site and related sub-sites using PHP, Flash and HTML/CSS. • Assisted in the writing of a B2B e-commerce system, written in Java utilising the Jakarta Struts framework and Hibernate ORM on Solaris/Tomcat. Designed, built and maintained the server infrastructure stack to support this application. • Maintained and administered network hardware, laptop, desktop, and servers running Windows NT and Unix. • Provided technical support and trouble-shooting support to users of our IT and phone systems. Assisted in network planning and construction across sites. • Developed and maintained database solutions. Show less