Job Description
About The ON Services Group
The ON Services Group is a growing and ambitious business delivering specialist IT support,
infrastructure, and managed technology solutions to clients across multiple sectors. We pride
ourselves on building long-term relationships through reliability, responsiveness, and high-quality
service delivery.
As the business continues to grow, we are investing in the internal structure, systems, and people
needed to scale effectively. This role is central to that journey.
We are seeking a highly capable Senior Office Manager with strong operational and people
management experience to oversee the day-to-day running of the business, support strategic
growth, and ensure operational excellence across administrative, commercial, and internal business
functions.
The Role
This is a senior, hands-on role with broad operational responsibility and real influence across the
business. Reporting directly to senior leadership, you will act as the operational backbone of the
company — ensuring that internal processes, administration, people management, and business
operations run efficiently and professionally.
You will lead office operations, support commercial activities, manage key internal processes, and
take ownership of operational decision-making to help the business scale effectively while
maintaining excellent service standards.
This role would suit an experienced Office Manager, Operations Coordinator, or Business Support
Manager looking to take the next step into a more commercially and operationally focused
leadership position.
Key Responsibilities
Office & Business Operations
Oversee the day-to-day running of office and administrative operations across the business
Ensure internal systems, processes, and workflows operate efficiently and consistently
Identify and implement operational improvements to support business growth and scalability
Maintain office facilities, equipment, suppliers, and service contracts
Ensure accurate document management, filing systems, and business records are maintained
Support senior leadership with operational planning and business coordination
Operational & Commercial Support
Support the delivery and coordination of projects, resources, and operational schedules
Manage client communications and ensure high levels of customer service
Support commercial activities including quotations, proposals, reporting, and contract
administration
Work closely with leadership to monitor operational performance and business priorities
Assist with supplier management and external stakeholder relationships
Coordinate internal meetings, reporting, and action tracking
Finance & Administration
Oversee invoicing, purchase ledger administration, expense management, and financial
record keeping
Support budgeting, forecasting, and financial reporting processes
Liaise with external accountants and finance providers
Monitor operational costs and support commercial decision-making through accurate
administration and reporting
Ensure payroll administration inputs are accurate and submitted on time
HR & People Management
Lead and oversee HR administration processes including recruitment coordination,
on-boarding, absence tracking, training records, and employee documentation
Support managers with employee relations, performance management, and people
processes
Help foster a positive, professional, and high-performing workplace culture
Ensure company policies and procedures remain compliant and up to date
Support staff development and training initiatives
Leadership & Decision-Making Responsibilities
Take ownership of operational decision-making within the office and administrative
functions
Manage priorities across multiple departments and ensure accountability for delivery
Act as a trusted point of escalation for operational and administrative matters
Support strategic business initiatives and continuous improvement projects
Provide regular operational updates and management reporting to leadership
Contribute to planning discussions and business improvement initiatives
About You
We are looking for an experienced, proactive, and commercially aware professional who thrives in a
fast-paced SME environment and enjoys taking ownership.
You will be highly organised, solutions-focused, and confident managing both operational
responsibilities and people-related matters.
Essential Skills & Experience
Proven experience in a senior office management, operations, or business support role
Previous experience with managerial responsibility and operational decision-making
Strong organisational and multitasking abilities
Excellent communication and stakeholder management skills
Strong administration and operational coordination experience
Experience overseeing finance administration processes including invoicing, budgeting
support, and reporting
Strong IT skills including Microsoft Office (Word, Excel, Outlook, Teams)
Ability to manage competing priorities and work autonomously
Proactive and solutions-oriented mindset
Desirable
Experience within IT services, technology, engineering, construction, or technical service
environments
Experience with CRM, ERP, or project management systems
HR or people management experience
Familiarity with operational KPI reporting and process improvement initiatives
Experience supporting senior leadership teams
What We Offer
Competitive salary (£40,000 – £48,000 depending on experience)
Company pension scheme
20 days annual leave plus bank holidays
Ongoing training and professional development
Opportunity to play a key role within a growing and ambitious business
Supportive and collaborative working environment
Genuine opportunity to influence business operations and growth
Additional Information
Applicants must have the right to work in the UK.
This is an excellent opportunity for an experienced operational professional seeking a pivotal role
within a growing business where their contribution will have genuine impact and visibility.
