{"id":4159750,"url":"https://alion.io/job/assystem-nuclear-defence-senior-planner","title":"Nuclear Defence - Senior Planner","company":{"id":5278,"name":"Assystem","domain":"assystem.com","url":"https://alion.io/company/assystem","size_band":"5000+","is_staffing_agency":false,"employer_type":"services","is_intermediary":false,"listed_via":null,"ats_vendor":"SmartRecruiters","truth_index":{"grade":"B","score":76,"open_postings":251,"ghost_share":0.004,"stale_share":0.964,"repost_share":0.004,"time_to_fill_p50_days":30,"computed_at":"2026-11-12T10:38:37Z"}},"role":"Operations","role_family":"Operations","seniority":"senior","employment_type":"contractor","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Aldermaston, United Kingdom"],"countries":["GB"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[],"status":"live","first_seen_at":"2026-11-12T10:01:26Z","employer_posted_date":"2026-11-12","last_verified_at":"2026-11-12T11:58:49Z","board_verified":true,"closed_at":null,"days_open":0,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":0},"description":"Finding solutions to climate change is the priority of the 21st century, and means switching to low-carbon energy. At Assystem, our mission is to accelerate the energy transition worldwide. To achieve this, our 7,500 Switchers combine their historical engineering expertise and project management with digital technologies.\nIn our 12 countries (Europe, Middle East, Asia) of operation, we are working on the production and distribution of low-carbon electricity, through the development of nuclear and renewable energies. We are also supporting the modernisation and development of energy grids, managing the setup and siting for new transmission and distribution networks, and using hydrogen to decarbonise the transport and industry sectors.\n Overview\nWe are seeking an experienced Senior Planner to support the successful delivery of a major nuclear defence programme in Aldermaston. The role is responsible for developing, maintaining, and controlling integrated project schedules across complex engineering, infrastructure, and construction activities within a highly regulated environment.\nKey Responsibilities\nDevelop and maintain detailed integrated project schedules using Primavera P6.\nMonitor progress, analyse performance, and identify schedule risks and opportunities.\nSupport the implementation of planning, scheduling, and reporting processes in line with programme controls requirements.\nConduct critical path analysis and provide schedule impact assessments to support decision-making.\nPrepare regular progress reports, dashboards, and forecasting information for project and programme leadership.\nWork collaboratively with project managers, engineers, commercial teams, and other stakeholders to ensure accurate planning data and programme alignment.\nSupport change control, baseline management, and recovery planning activities.\n 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.\nWe 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 !. 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