Full-Time

Senior Planner

ASSYSTEM

ASSYSTEM

5,001-10,000 employees

Engineering services for design, construction, commissioning

No salary listed

London, UK

Hybrid

Three days on-site per week required.

Category
Business & Strategy (1)
Required Skills
Risk Management
Excel/Numbers/Sheets

Get referred to ASSYSTEM

See people who can refer or advise you

Requirements
  • Extensive experience as a Senior or Lead Project Planner using Primavera P6 on major infrastructure, engineering, or construction programmes.
  • Proven experience leading planning functions, teams, or programme-wide planning activities on complex projects.
  • Proven experience delivering projects within aviation environments (airports, terminal upgrades, airside/landside infrastructure, baggage systems, operational facilities), or complex live operational environments where continuity of operations is critical.
  • Strong understanding of project controls, scheduling methodologies, and programme governance.
  • Advanced capability in critical path analysis, schedule risk assessment, and recovery planning.
  • Experience interfacing directly with senior stakeholders, operational teams, contractors, and client organisations.
  • Strong commercial awareness including change management and delay analysis exposure.
  • Advanced proficiency in Primavera P6 and Microsoft Excel.
  • Excellent communication, leadership, and stakeholder management skills.
Responsibilities
  • Lead the development, management, and maintenance of fully integrated Primavera P6 project schedules across complex programmes and portfolios.
  • Act as Lead Planner across major projects or multi-project programmes, providing oversight, coordination, and assurance of all planning activities.
  • Manage and mentor project planners, ensuring consistency of planning standards, reporting, and programme controls methodologies.
  • Develop robust baseline programmes covering design, procurement, construction, testing, commissioning, and operational handover activities.
  • Provide critical path analysis, schedule assurance, and performance reporting to senior leadership teams.
  • Drive programme controls best practice and planning governance across multiple projects.
  • Lead planning workshops and collaborative schedule reviews with project teams, contractors, consultants, and operational stakeholders.
  • Identify schedule risks, constraints, and opportunities, implementing mitigation and recovery strategies where required.
  • Coordinate project delivery activities within live operational environments, including phased works, shutdowns, possessions, and restricted access windows.
  • Support commercial teams with change management, extension of time assessments, and delay analysis.
  • Challenge project assumptions, sequencing, logic, and resource planning to improve programme efficiency and delivery certainty.
  • Produce executive-level reporting, dashboards, and progress updates for clients and senior stakeholders.
  • Ensure alignment between programme schedules, operational requirements, and stakeholder expectations.
  • Support integration of cost, risk, and resource information into project controls reporting where applicable.
Desired Qualifications
  • Major airport or transport infrastructure project experience.
  • Experience working within highly regulated or safety-critical environments.
  • Knowledge of NEC contracts and programme/commercial reporting requirements.
  • Familiarity with integrated project controls including cost and risk management.
  • Experience managing or mentoring planning teams across multiple projects or programmes.
  • Membership of a recognised professional body (APM, PMI, CIOB, etc.).

Assystem provides engineering services for complex projects, covering design, construction, supervision, commissioning, and operation, with a strong focus on the nuclear and energy sectors. Its approach combines multidisciplinary engineering teams and project-management capabilities to move projects from initial concept through to operation. The company differentiates itself through a long track record, strategic acquisitions (including Alphatem in 1995 and Mactech Energy Group in 2025) and an early public offering in 2013, which have expanded its capabilities and market reach in the energy and nuclear fields. Its goal is to be a leading, reliable partner for clients by delivering end-to-end engineering services and helping them meet safety, performance, and regulatory requirements across the project lifecycle.

Company Size

5,001-10,000

Company Stage

IPO

Headquarters

Paris, France

Founded

1966

Get referred to ASSYSTEM

See people who can refer or advise you

Simplify Jobs

Simplify's Take

What believers are saying

  • H1 2026 nuclear revenue grew 8.0% organically and reached 81% of total revenue.
  • French revenue rose 4.2% organically to €201.1 million, driven by nuclear new-builds.
  • UK civil nuclear engineering, defence, and government frameworks expand its addressable pipeline.

What critics are saying

  • Heavy nuclear concentration exposes Assystem to French or UK project delays and cancellations.
  • International volumes fell in India and the Middle East from project endings and slower phasing.
  • Currency weakness in sterling, rupee, and riyal continues to pressure reported growth.

What makes ASSYSTEM unique

  • Founded in 1966, Assystem specializes in nuclear engineering and project lifecycle services.
  • Its France business supports EDF across commissioning, new-builds, fuel cycle, and operations.
  • The 2025 Mactech Energy Group acquisition deepens its nuclear delivery capabilities.

Help us improve and share your feedback! Did you find this helpful?

Benefits

Health Insurance

Dental Insurance

Vision Insurance

Unlimited Paid Time Off

Flexible Work Hours

Remote Work Options

Paid Vacation

Paid Holidays

Hybrid Work Options

401(k) Retirement Plan

Wellness Program

Mental Health Support

Gym Membership

Professional Development Budget

Conference Attendance Budget

Stock Options

Company Equity

Phone/Internet Stipend

Home Office Stipend

Relocation Assistance

Childcare Support

Meal Benefits

Parental Leave

Family Planning Benefits

Fertility Treatment Support

Company News

Bdaily
Jan 30th, 2025
Assystem expands UK footprint with takeover

A global nuclear engineering firm has strengthened its UK presence with the acquisition of a specialist construction company. Paris-headquartered Assystem has… | North East | Construction | Engineering | International | Energy | Mergers & Acquisitions | Commercial Partnerships | Manufacturing & Construction |

Assystem
Jan 17th, 2024
Assystem acquires KEOPS Automation, engineering specialist in automated systems and data enhancement

Assystem, an international engineering, digital services and project management company, has acquired 100% of the shares of KEOPS Automation, a French company specializing in the integration of industrial operating platforms and the enhancement of their data (industrial OT and IT, automated systems, supervision systems, BI applied to manufacturing).

Global Construction Review
Jan 5th, 2024
France’s Assystem acquires India’s L&T Infrastructure Engineering - Global Construction Review

France-headquartered engineer and project manager Assystem has acquired India’s L&T Infrastructure Engineering, a subsidiary of the Larsen & Toubro group.

Tech.eu
Feb 11th, 2022
Germany’s SQS acquired by Assystem Technologies for over £280 million

German company Software Quality Systems (SQS), a provider digital quality assurance services,…