Senior Mechanical Design Engineer

Alternative Heat Ltd; Banbridge; On-site; GBP 65,000 - 90,000; Full time

Job summary

Alternative Heat Ltd in Banbridge, Northern Ireland, seeks a Senior Mechanical Design Engineer to lead the mechanical building services design for modular plantrooms and plantroom skids on hyperscale datacentre projects. You will oversee design development, calculations, equipment selection and coordinated package delivery.

You will mentor engineers and coordinate with the Head of Engineering DFMA, DFMA leads, suppliers and clients to ensure quality, compliance with standards, and efficient

Qualifications

• Proven experience in mechanical building services design for large-scale modular assemblies.
• Strong knowledge of standards and design assurance processes.
• Ability to mentor engineers and drive design quality.

Responsibilities

• Lead the mechanical building services design for modular plantrooms and plantroom skids.
• Review client specifications and develop system schematics and calculations.
• Coordinate designs with clients, suppliers, manufacturing and DFMA teams; mentor junior engineers.

Skills

Mechanical design

DFMA coordination

Project leadership

Job description

Senior Mechanical Design Engineer

Department: Building Services

Employment Type: Permanent - Full Time

Location: Alternative Heat Head Office

Reporting To: Head of Engineering DFMA

Description

Team Overview

Within one of these Business Units, Alternative Heat deliver turnkey plantroom packages at scale, directly to hyperscale developers throughout Europe, under long-term framework agreements. This Business Unit is scaling at pace, and we have secured a 5‑year framework agreement to design, manufacture and deliver volume based, turnkey plantroom modules (mechanical, electrical and BMS) to projects throughout Europe, with demand set to increase annually.

Role Overview

Lead and deliver the mechanical building services design for modular plantrooms, plantroom skids and multi-service MEP modules on hyperscale datacentre projects, taking responsibility from initial design development through calculations, equipment selection and coordinated design package delivery. Provide technical leadership and mentorship to engineers, graduates and apprentices, ensuring quality through design checking and approval processes. Working closely with the Head of Engineering, Lead Design Coordinator and DFMA Lead, coordinate resources, priorities and project deliverables while taking ownership of assigned design packages. Resolve complex technical challenges, identify and manage design risks, and elevate any significant issues, scope gaps or incomplete client requirements to the Head of Engineering to ensure successful project delivery.

Job Title | Senior Mechanical Design Engineer

Location | Head Office, Banbridge

Hours | Monday-Thursday 8am-5pm and Friday 8am-3pm

Salary | Competitive Depending on Experience

Responsible to | Head of Engineering DFMA

What You'll be Doing

The role involves leading the delivery of mechanical building services designs, including reviewing client specifications, developing system schematics and operating sequences, completing system calculations, and selecting suitable equipment to meet performance and maintenance requirements. It requires ensuring technical accuracy, compliance with relevant standards and design assurance processes, while assessing risks, resolving technical issues and coordinating designs with clients, suppliers, manufacturing, assembly and DFMA teams. The role also includes supporting procurement, bids, testing and commissioning interfaces, managing design documentation and digital workflows, coordinating project deliverables and resources, and mentoring junior engineers. In addition, it involves maintaining design quality and control, managing design changes, and driving continuous improvement through standardisation, lessons learned and cost‑efficient design, while retaining ownership of mechanical design intent and coordinating with DFMA engineers responsible for detailed fabrication and assembly documentation.