SIOP Manager

Ontic, a leading licensor and manufacturer of complex engineering parts for the global aerospace and defence industries, is now recruiting for a SIOP Manager to lead the end\-to\-end Sales, Inventory \& Operations Planning process within our MRO business.

This is a key role, responsible for aligning customer demand, operational capacity, inventory strategy, and financial objectives through a structured, data\-driven planning cycle.

Ontic is more than just a business, we’re a community of innovators who pride ourselves on fostering a culture where talent thrives, ideas flourish, and careers are built. We are committed to excellence, continuously improving and adapting to remain at the forefront of our industry.

Role Overview \& Purpose:

We are seeking an experienced, analytical and collaborative SIOP Manager to lead and continuously improve the SIOP process within our MRO environment.

This role is accountable for bringing together demand, supply, inventory, operational capacity, and financial planning to support clear, informed decision\-making. Working cross\-functionally with Sales, Operations, Planning, Supply Chain, Engineering, Programmes, and Finance, the SIOP Manager will improve forecast accuracy, strengthen planning discipline, and help balance service levels, cost, inventory investment, and operational efficiency.

The SIOP Manager will operate at both a strategic and operational level, translating business priorities into structured planning processes, clear governance, and actionable plans.

Key Responsibilities:

The core responsibility of this role is to lead and manage the SIOP cycle across monthly and quarterly planning cadences, ensuring consistent execution across demand planning, supply planning, reconciliation, and executive review.

The SIOP Manager will consolidate and validate demand inputs from customer contracts, forecasts, historical trends, and commercial opportunities, challenging assumptions to ensure plans are realistic, data\-driven, and aligned to business strategy.

The role will oversee alignment of supply plans with demand and operational capacity, ensuring visibility of constraints, risks, and opportunities, and driving corrective action where performance is off track.

The SIOP Manager will define and manage inventory strategies across key MRO categories, including rotable components, long\-lead components, and critical parts such as matched gears and rotors, balancing inventory investment with service levels, risk, and working capital objectives.

Performance management is central to the role. The SIOP Manager will track and report performance against plan, including forecast accuracy, service levels, inventory turns, and other key SIOP metrics, developing dashboards and reporting frameworks to support operational and executive decision\-making.

The role will also provide key planning inputs into budgeting and financial forecasting cycles, ensuring SIOP outputs are aligned with financial plans and supporting scenario planning and trade\-off decisions across cost, revenue, inventory, working capital, and service performance.

In addition, the SIOP Manager will facilitate cross\-functional decision\-making, lead executive SIOP reviews, and continuously improve SIOP processes, governance, tools, reporting standards, and ways of working.

About You

At Ontic, our culture is integral to how we deliver success. We’re looking for someone who not only brings the right experience, but who will thrive in a culture of recognition, empowerment, and accountability.

To be successful in this role, you will bring:

• Strong experience in SIOP, S\&OP, demand planning, or supply chain leadership within an MRO, aviation, aerospace, or complex manufacturing environment


• Deep understanding of integrated business planning, including demand, supply, inventory, and financial alignment


• Experience managing complex demand streams and long\-lead supply chains


• Strong analytical capability, with experience in forecasting, scenario modelling, and performance reporting


• Proven ability to influence and align senior stakeholders across multiple functions


• Experience driving process standardisation, governance, and continuous improvement


• Strong commercial awareness and the confidence to challenge assumptions constructively


• A structured, data\-driven approach to planning, decision\-making, and performance management

You will also have:

• Experience developing dashboards, reporting frameworks, and SIOP performance metrics


• Strong proficiency in Excel and planning/reporting tools


• The ability to translate complex data into clear insights, risks, and recommendations


• A continuous improvement mindset, with a focus on simplification, efficiency, and better business outcomes


• The confidence to operate at both strategic and operational levels

Best Place to Work

We are more than the sum of our parts — and we’ve been recognised for it:

• Ranked \#9 in Best Companies’ Q3 leaderboard for Best Manufacturing Company


• 72\.5% of employees in our 2023 survey said they are proud to work at Ontic


• We’ve experienced rapid growth, doubling in size in recent years

No day is the same at Ontic. Our success comes from empowering our colleagues to create opportunity, fostering an environment of autonomy where we ask for forgiveness, not permission.

Our Values

Our values are intrinsic to everything we do:

• We share a common sense – a global family of specialists with a shared passion for precision


• We have the freedom to choose – challengers and innovators who think differently


• We create the opportunity – change\-makers with a clear direction and can\-do spirit

We are a fast\-paced business with ambitious growth plans; so if you are dedicated, enthusiastic and always seeking ways to improve, you'll enjoy a career with us!

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