Senior Fire Engineer (London/M25 Corridor)

Harmony is on a mission to be the best life safety partner to work with and for. Rated an ‘Outstanding Employer’ by Best Companies in 2025, we are only getting bigger and stronger — and we’re looking for A-players to help us get there.

We are passionate about making a difference and obsessed with quality. Our goal is to build a world where every resident can sleep safely at night, knowing their home is 100% safe.

We are looking for a Senior Fire Engineer to join our Service Delivery team, covering London and the M25 corridor. You will carry out planned and reactive maintenance, inspection, and commissioning of fire safety systems across a diverse portfolio of residential, commercial, and public sector clients — working to the highest technical and quality standards on every visit. This is a field-based role. You will be the technical lead on your sites — responsible for the quality of your work, the accuracy of your certification, and the confidence our clients place in Harmony. If you take pride in your craft, hold yourself to a high standard, and want to be part of a business genuinely committed to saving lives — read on.

Key Responsibilities

• Carry out planned preventative maintenance (PPM), reactive call-outs, and commissioning of fire alarm systems, emergency lighting, and associated fire safety systems across London and the M25 corridor.
• Produce accurate, fully compliant certification and service documentation following every visit, ensuring records are completed in line with BS 5839, BS 5266, and client requirements.
• Diagnose and resolve faults efficiently and accurately, minimising system downtime and keeping clients informed throughout.
• Carry out system commissioning and handover for new installations, ensuring all documentation, test records, and certifications are completed to the required standard.
• Act as the senior technical point of contact on site — providing guidance to junior engineers where required and representing Harmony’s standards at all times.
• Maintain your van stock, test equipment, and tools to the required standard, ensuring you are always equipped to carry out your work.
• Liaise with clients and site contacts professionally, communicating findings, recommendations, and next steps clearly.
• Complete all job management system entries accurately and on time, including time logging, parts usage, and site notes.
• Participate in the out-of-hours emergency callout rota as required.

Skills, Knowledge & Expertise

• An A-player mindset — high standards, extreme ownership and the drive to do things properly, the first time.
• Proven hands-on experience maintaining, servicing, and commissioning fire alarm systems and emergency lighting to BS 5839 and BS 5266.
• Strong fault-finding and diagnostic skills — able to resolve complex system issues efficiently and accurately.
• Solid working knowledge of fire alarm panel types and manufacturers — comfortable working across a range of systems.
• Experience producing compliant service records, commissioning documentation, and certification.
• Confident acting as a senior engineer on site, providing technical guidance and setting the standard for quality.
• Strong communication skills — professional and clear when dealing with clients and site contacts.
• Able to manage your own workload and travel schedule across London and the M25 corridor.
• Full UK driving licence.
• FIA, ECS, or equivalent industry qualification (preferable).

Job Benefits

This is a chance to take a senior field engineering role at one of the UK’s fastest-growing fire safety specialists — working across a varied and growing London and M25 portfolio, with a company vehicle, strong technical support, and real opportunities to develop. At Harmony, we ask a lot — and we give a lot back. The hours are real, the standards are high and the work is demanding, but for those who show up, deliver and go the extra mile, the rewards follow. A players here enjoy a competitive salary, a company vehicle, a Personal Development Plan with ongoing training and mentoring, unlimited holiday, a bonus scheme paying up to 50% of annual salary, enhanced maternity and paternity, lunch, snacks and refreshments on us every day at the office (fresh fruit and Takeaway Friday included), a team social budget, cycle to work, an auto-enrolment pension, two major company events a year and our Reward and Recognition scheme — including European mini-breaks for those who go above and beyond. It is a collaborative, high-energy environment focused on doing things the right way — and none of it is a perk for showing up; it’s what we share with the people pulling the business forward.

Harmony is an equal opportunity employer. We consider all applicants for employment regardless of age, disability, sexual orientation, gender identity, family or parental status, race, colour, nationality, ethnic or national origin, religion or belief. We want everyone who works with us to feel valued and to make a difference.