Senior Planner
Confirmed on the employer's own hiring board on Sep 23, 2026. First seen by Alion on Sep 22, 2026. Assystem scores B on the Alion truth index.
Today, Assystem is among the top three independent nuclear engineering firms worldwide. With over 60 years of experience in highly regulated sectors, the group supports public and industrial stakeholders in the execution of complex and strategic infrastructure projects, subject to high safety and security requirements.
Assystem mobilizes 8,000 experts in 13 countries and intervenes across the entire project lifecycle, in engineering, project management and digital solutions.
Main Duties:
- Lead the planning, production and management of project schedules across complex programmes.
- Coordinate work packages, track progress against milestones and manage resource planning.
- Oversee and review sub-contractor programmes, ensuring accuracy and alignment with project objectives.
- Engage with stakeholders to report on progress, risks, opportunities and project changes.
- Support bid and proposal activities through manhour estimating and project planning input.
- Produce clear project reporting, including critical path analysis and performance metrics for senior leadership.
What We're Looking For:
- Intermediate-level Primavera P6 experience (essential).
- Strong knowledge of Microsoft Excel and Microsoft Project.
- Self-motivated with the ability to work independently and meet deadlines.
- Excellent communication skills, able to clearly present project progress and key risks.
- Strong attention to detail with the confidence to challenge and review contractor submissions.
Desirable Experience:
- Proven experience planning projects under NEC4 contracts (particularly Option A & Option C).
- Background in major infrastructure design and build projects.
- Experience within the Nuclear or Defence sectors is highly desirable.
Why join the community of Switchers?:
The Group is currently ranked Third in the world for nuclear engineering.
A dynamic career management policy to enable our employees to progress through our five business lines: operations, project, technical, sales and support functions
Provide opportunities to work on exciting, global projects
Access to an employee assistance programme with free mindfulness, health, wellbeing resources and a confidential support line available 24/7 via phone or text
Discount vouchers for days out and restaurants, eye test and glasses vouchers, cycle to work scheme, free flu jabs
Security clearance:
Due to the nature of work to be undertaken applicants will be required to meet certain residency criteria in order to attain a minimum level of UK security clearance if not already security cleared to a minimum SC level.
NOTICE TO CANDIDATES ON RECRUITMENT FRAUD - We are committed to safeguarding candidates from fraudulent activity associated with our recruitment process. Please note that we will never offer specialist CV writing services, request payment or ask for sensitive personal information during the recruitment process.
We are committed to equal treatment of candidates and promote, as well as foster all forms of diversity within our company. We believe that bringing together people with different backgrounds and perspectives is essential for creating innovative and impactful solutions. Skills, talent, and our people’s ability to dare are the only things that matter !. Bring your unique contributions and help us shape the future.