Senior Project Manager

Work on Technology That Protects What Matters

At Si Xworks , we build secure digital solutions that support Defence and National Security missions
. Our teams work on complex problems where reliability, security, and speed of innovation matter.

We’re looking for a Senior Project Manager who enjoys solving difficult technical challenges and wants their work to have real operational impact.

As a Senior Project Manager
, you’ll lead complex, high-value and strategically important projects that are critical to customer and business outcomes. They provide delivery leadership across challenging stakeholder environments, balancing commercial performance, delivery excellence, risk management and customer satisfaction.

Your work may include:

• Lead complex programmes or projects with significant technical, commercial or organisational complexity.
• Establish delivery strategies that enable successful customer outcomes.
• Align project execution with programme, portfolio and business objectives.
• Provide leadership across ambiguous or rapidly evolving environments.
• Align project delivery strategies with account growth objectives and wider business strategy.

• Lead large multidisciplinary teams delivering secure digital, software and technology solutions.
• Manage complex dependencies across suppliers, customers and internal teams.
• Balance pace of delivery with governance, security and assurance requirements.
• Drive recovery plans where project performance is at risk.

• Lead complex transition activities from project delivery into managed service operation.
• Ensure operational support arrangements, service acceptance criteria and service governance are established.
• Work closely with Technical Leads to achieve successful adoption and long-term service performance.
• Drive delivery readiness for Service Acceptance Gate approvals.

• Build trusted relationships with senior customer stakeholders.
• Manage executive-level communications and governance forums.
• Influence decisions across project, programme and organisational boundaries.
• Handle sensitive delivery, commercial and operational challenges.
• Partner with Account Directors to strengthen strategic customer relationships.
• Contribute to account planning and growth discussions.
• Identify opportunities for follow-on work, service expansion or new capability development.

• Own significant project budgets and forecasts.
• Manage financial performance, margin and commercial risks.
• Support bid activities, project mobilisation and transition planning.
• Balance customer outcomes and delivery commitments against margin, resource utilisation and organisational priorities.

• Coach and mentor Junior Project Managers and Project Managers.
• Support development of delivery frameworks, governance approaches and lessons learned.
• Contribute to the wider capability development of the delivery function.

• Lead management of complex delivery risks.
• Direct project assurance activities.
• Support audits, reviews and customer assurance processes.
• Ensure effective decision-making and escalation management.

We value people who take ownership, think critically, and enjoy working as part of a collaborative team tackling complex challenges. You don’t need to tick every box, but we’re particularly interested in people with skills/experience in:

• Extensive project management experience delivering complex technology or digital projects.
• Demonstrated success managing large multidisciplinary teams.
• Experience operating within secure, regulated or mission‑critical environments.
• Strong commercial, financial and contractual management capability.