Diarmuid Wrenne

• Managed all technical leaders including those running the SAAS, SRE, Audio Delivery, Database and Corp IT teams
• Coordinated the migration of many legacy windows systems out of data centers and into Azure and AWS
• Responsible for managing and significantly reducing the AWS and datacenter spend while maintaining service
• Coordinated costs saving with the other members of the executive team
• Developed POC and coordinated the implementation of a PBX, new ELK based logging and new ticket management systems to save costs
• Helped architect and write python and C# based resource identification scripts for managing cloud spend in AWS and Azure
• Consolidated carrier vendors to simplify billing and outsourced management of resources to them
• Migrated off datacenter based Sonus SBCs to AWS based Cataleya Orchid allowing datacenters to be closed down

• Operations director of the 25 person International team
• Responsible for day to day running of the AWS based infrastructure in most efficient way
• Worked with development to ensure operational support was a key part of the development work
• Developed the cloudformation scripts to deploy an Active MQ based messaging backbone globally
• Member of crisis management team
• Expanded the SAAS outsourcing team in India
• Worked with teams to ensure CPD plans were developed
• Providing analysis of cost/revenue breakdown of products and customers
• Identifying key areas that needs work and developing plans to address
• Expansion of automated alerting and exception management processes

• Manager of a 15 person international team
• Responsible for the 24-7 running of the audio applications and bridging infrastructure
• Cost management of AWS environments
• Management of NOC calls
• Rapidly scaled out service in response to Covid-19 related usage increase
• Liasing with the care teams and management on key clients and risks
• Expanded use of automated monitoring, checklists and pair programming concepts

• Brought in to develop a carrier facing SBC using open source technologies
• Built the team, hiring from outside PGi
• Assessed technology options including Sipwise, kamilio, Freeswitch, RTPEngine and Drachtio
• Decided on AWS hosting, Freeswitch as the B2BUA and javascript driven Drachtio as the SIP proxy
• Developed working prototype for inbound and outbound calls
• Used Ansible, and Fabric for server automation
• Used Cloud formation and docker compose for application deployment
• Javascript and Drachtio for multi server implementation

• Brought in to fix the reconciliation process between operations and finance
• Developed an extensive set of tools to audit the audio system to ensure that all calls were sent to billing correctly
• Integrated SQL, AWS S3 and Billing rest interfaces to generate command line tools to automate data extraction in the event of data processing failures
• Identified, extracted and processed millions of minutes of “lost” CDRs

• International Tier 3 Audio Operations (EMEA),
• Extended the DevOps role to use Amazon Web Services, C#, Python and SQL Server to automate monitoring and data collection
• Automated production of SQL based critical financial reports and introduced version control of these
• Worked with senior management to troubleshoot “at-risk” clients
• Managed emergency calls related to outages and incidents
• Awarded the monthly “Medallion award” 4 times and winner of the Global Operations Annual Medallion 2017
• Worked with partners and clients to integrate new services and products
• Developed scriptable versions of C# libraries in Python for test automation
• Extensively modified the alerting and monitoring process to be more automated and intelligent
• Introduced time-series anomaly detection that reduced the number of extraneous alerts
• Integrated multiple data streams from Sumo Logic, MS SQL server, MySQL and various monitoring platforms into alerts
• Built Kibana servers with elasticsearch for real time data monitoring
• Built Bosun servers for real time graphing of time series data
• Developed an inhouse continuous audio quality monitoring system based in AWS
• Extensive use of Pandas data analysis library and Python to manage data.

• Supported VoIP and UC technologies including Globalmeet, imeet and Lync
• Identified key performance problems in Lync and imeet
• Developed strong AWS and SumoLogic analysis skills
• Extensive use of Chef to automate infrastructure deployments to AWS and OpenStack
• Development of java based components

• Custom software development in Python, Java and C#
• Server configuration and deployment
• Amazon AWS based systems using EC2, SimpleDB, RDS and S3
• Operations engineer for various companies
• Developed CRM system with accounting integration
• Worked with telecoms regulator on Rural Broadband Scheme
• Developed a bluetooth based marketing system based on mini 386 linux based clients and an AWS based management system
• Extensive c and python based coding

Development of Front Desk software for Traders in c#

Development of code using quant libraries

On site liaison for third parties including Reuters, Bloomberg and Telecoms

Migration manager for interstate move of trading, brokering and back office personnel and systems

Managed implementation of Oracle Financials

Supported the implementation of Business Objects reporting system.

• Developer of a GIS and mapping application for use in geophysical studies
• Converted the system from a single threaded POC into a business grade multithreaded web based mapping system
• Core code was developed in C# and asp.net

• Performance assessment of Quantum and QRisk
• Escalation of performance issues to Sungard
• Development of database management scripts
• Worked with the business to create a Report Manifest
• Primary contact for SQL Server related bugs and defects
• Writing of extracts for exporting to external systems
• Developed migration strategies for the retiring of legacy systems
• Developed online banking to AS400 messaging system to enable realtime transactions
• Developed monitoring and visualization systems for online banking solution
• Reverse engineered 4th Gen development language to generate Visual basic code
• Developed a secure, encrypted system for migration of accounts and credentials between legacy and new banking systems.

• Manager of a 6 man Visual Basic development and support team
• Developed and supported a 200+ seat Imaging and Workflow system using Staffware and FileNet that enabled the transfer of USD $7 Billion daily
• Identified and developed a solution that automated a process previously requiring a 10 FTE team
• Extensive liaising (both verbal and written) with senior management, International support, local support and operators
• Generally streamlined data exchange between systems
• Developed several innovative solutions to problems including the writing of addins for Visio for the graphical display of server logs
• Rolled out the desktop clients locally for a new banking system
• Was the primary technical contact for all SWIFT, IBAN and Messaging changes

• Web and Desktop Developer of Accounting and ERP software In Visual Basic
• Was quickly promoted to a rapid development team in Birmingham, UK