Diarmuid Casey
Cork
Summary
Technical and commercial professional with extensive experience in operations service delivery and B2B sales across renewable energy, HVAC, hydronic heating, and electrical sectors. Proven expertise in commissioning and troubleshooting complex systems, enhancing reliability and performance. Skilled in training technical teams and managing multi-vendor supply networks to achieve reliable commercial outcomes. Strong relationship builder with clients and stakeholders, driving brand loyalty and meeting commercial objectives.
Overview
25
25
years of professional experience
Work History
Area Sales Manager
NRG Awareness
03.2025 - 06.2025
- Facilitated regional sales growth through plumbing and heating merchant channels.
- Collaborated with counter staff and account managers to support sales initiatives.
- Assisted installers and contractors by providing design layout, application guidance, and product performance and reliability.
- Delivered technical support on-site and remotely to resolve mechanical and electrical issues effectively.
- Collaborated with marketing team to develop promotional materials and campaigns that align with sales objectives.
- Fostered strong relationships with key clients and stakeholders, enhancing brand loyalty and repeat business.
- Contacted current and potential clients to promote, upsell and cross-sell products and services.
- Conducted training sessions and live demonstrations for installers and technicians to foster product trust and industry alignment.
Technical Sales & Service Manager
NRG Awareness
01.2024 - 03.2025
- Assisted in integrating corporate technical service delivery with B2B sales across clean-energy product lines.
- Provided technical guidance to independent installers and internal sales teams.
- Facilitated training sessions covering standard heat pump applications, and custom system builds.
- Actioned customer feedback to improve product and service provisions.
- Negotiated contracts with suppliers and service providers to maximise profitability.
- Participated in trade shows and industry events to network and promote company products.
- Set prices based on market capacity and demand to achieve revenue targets.
- Utilised CRM software to track sales performance and identify areas for improvement.
- Collaborated with the human resources department to recruit, hire, and train new sales and service staff.
Service Manager / Engineer
NRG Awareness
03.2023 - 01.2024
- Facilitated field commissioning safety testing and fault isolation for new alternative energy installations, achieving high first-time-right rates.
- Assisted in providing field performance feedback to product development teams, contributing to improvements in build quality and installation layouts.
- Supported compliance with f-gas regulations while aiding in the optimisation of custom product assembly and sales processes.
- Resolved escalated customer complaints with tact and professionalism, restoring client confidence.
- Coordinated with other departments to ensure a unified approach to customer service.
- Coordinated and allocated resources to support service team.
- Oversaw inventory management, ensuring availability of necessary parts and equipment.
- Led daily operations to achieve key business objectives.
- Orchestrated the scheduling and deployment of staff to meet customer demand efficiently.
- Negotiated contracts with suppliers, securing cost-effective solutions for the business.
- Implemented robust health and safety processes for minimised workplace risk.
- Participated in industry events and workshops, staying informed of the latest trends and practices.
Owner / Operator
Onecall Electrical & Plumbing
01.2017 - 01.2023
- Established and expanded an electrical heating and plumbing services business, while supporting annual revenue growth.
- Managed finance, safety certifications, and staffing to ensure operational efficiency.
- Assisted in developing strong client relationships and provided technical consulting and emergency breakdown services.
- Served as a Safe Electric Registered Qualified Certifier, ensuring compliance with national electrical standards.
- Controlled expenses and allocated financial resources to reach budget goals.
- Cultivated strong industry relationships to promote services and improve business operations.
- Supervised employee activities and assessed responsibilities and tasks, recommending improvement actions to boost revenue and achieve sales goals.
- Maintained a safe workplace by complying with health and Safety regulations.
Electrician
KQH Construction
01.2015 - 01.2017
- Led site installations and safety verifications in compliance with ETCI wiring regulations.
- Oversaw the delivery of projects, ensuring adherence to safety standards.
- Completed electrical work, including maintenance, installation and repairs within budgets.
- Directed electricians on installation, maintenance and repair of electrical wiring and equipment.
- Acted as a registered qualified certifier, guaranteeing compliance with national electrical standards.
- Troubleshot electrical issues using specialist testing devices.
Maintenance Technician
Kepak
01.2014 - 01.2015
- 24/7 reactive plant diagnostics, contractor oversight, and GMP documentation.
- Kept machines in good working order by performing preventative maintenance.
- Updated maintenance logs and reports with detailed records of repairs and servicing activities for future reference.
- Dismantled machinery and equipment to replace parts and make repairs.
- Maintained secure and controlled work environment, identifying and mitigating hazards.
- Conducted routine inspections and maintenance of electrical, plumbing, and HVAC systems to uphold safety standards.
Service Engineer
Firecrest Safety Systems
01.2012 - 01.2014
- Commissioned and diagnosed fire alarm and gas suppression systems.
- Installed and maintained fire alarm systems across various commercial and residential properties, adhering to strict safety standards.
- Provided detailed training to clients on the operation and maintenance of their fire alarm systems, enhancing safety awareness.
- Performed preventive and corrective maintenance to reduce faults.
- Documented service interventions in detail, ensuring accurate records for future reference and compliance.
- Delivered emergency repair services promptly, minimising operational disruptions for clients.
- Managed inventory of fire alarm components and tools, ensuring availability of necessary materials for all projects and repairs.
Technical Support Specialist
Kedco Energy
01.2008 - 01.2012
- Demonstrated outstanding technical troubleshooting skills, identifying problems promptly and precisely.
- Used exceptional planning and prioritisation skills to manage and resolve high volumes of incident tickets.
- Maintained detailed records of customer interactions, technical issues, and resolutions in the support database for future reference.
- Performed onsite installation, modification and maintenance of systems and equipment to examine functionality and performance.
- Provided follow-up support for excellent customer service.
- Worked well under pressure to complete time-sensitive repair work and restore key equipment to operational status.
- Provided comprehensive training to client staff on equipment operation and safety protocols.
- Fostered strong relationships with clients, becoming a trusted advisor on equipment management strategies.
- Managed inventory of spare parts and tools, optimising resource availability for field tasks.
Apprentice Electrician & Plumber
01.2000 - 01.2008
- Gained a foundation in electrical and plumbing systems.
- Assisted with electrical and plumbing installation tasks, gathering tools and components to support job preparations.
- Adhered to company standards and HSE regulations for work site safety.
- Maintained a clean and organised work environment, adhering to health and safety regulations to prevent accidents.
Skills
- Proactive self-starter
- Merchant-led sales
- Technical sales
- Account management
- CRM software utilization
- Business development
- Deal negotiation
- Profit and loss understanding
- Product demand generation
- Contractor networking
- Air-to-Water Heat Pumps
- Solar PV and Thermal
Qualifications & Certifications
- QQI Level 6 – Electrical Craft
- QQI Level 6 – Micro Solar PV Systems Implementation
- QQI Level 6 – Solar Domestic Hot Water Systems
- QQI Level 5 – F-Gas Handling (RACHP Category 2), 2023
- Safe Pass
- Full Clean Driving Licence
References
Available upon request.
Timeline
Area Sales Manager - NRG Awareness
03.2025 - 06.2025
Technical Sales & Service Manager - NRG Awareness
01.2024 - 03.2025
Service Manager / Engineer - NRG Awareness
03.2023 - 01.2024
Owner / Operator - Onecall Electrical & Plumbing
01.2017 - 01.2023
Electrician - KQH Construction
01.2015 - 01.2017
Maintenance Technician - Kepak
01.2014 - 01.2015
Service Engineer - Firecrest Safety Systems
01.2012 - 01.2014
Technical Support Specialist - Kedco Energy
01.2008 - 01.2012
Apprentice Electrician & Plumber -
01.2000 - 01.2008