{"id":3006702,"url":"https://alion.io/job/positiv-cohort-systems-engineer-defence","title":"Systems Engineer- Defence","company":{"id":687925,"name":"Positiv+ Cohort","domain":"positivcohort.com","url":"https://alion.io/company/positivcohort","size_band":"1-10","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Workable","truth_index":{"grade":"B","score":75,"open_postings":8,"ghost_share":0,"stale_share":1,"repost_share":0,"time_to_fill_p50_days":null,"computed_at":"2026-10-30T05:48:23Z"}},"role":"Aerospace","role_family":"Aerospace","seniority":null,"employment_type":"contractor","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Stevenage, United Kingdom"],"countries":["GB"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":67000,"max_usd":138000,"period":"year","method":"role_country_seniority_unknown","sample_n":15},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Verification & Validation","optional":false}],"status":"live","first_seen_at":"2026-04-20T00:00:00Z","employer_posted_date":"2026-04-20","last_verified_at":"2026-10-30T04:37:58Z","board_verified":true,"closed_at":null,"days_open":193,"trust":{"level":"stale","repost_count":0,"flags":["stale"],"days_open":192},"description":"Role Purpose\n*RATES OUTSIDE IR-35*\nThe Systems Engineer (Mechanical Bias) is responsible for the definition, management, and delivery of the missile’s mechanical requirements package. The role ensures that mechanical and thermal requirements are clearly derived, structured, flowed down, and validated from system level through to sub-systems across all missile variants.\nPositioned at the centre of the systems engineering function, the role acts as the focal point for mechanical requirements, interface definition, and compliance evidence, ensuring coherence, traceability, and alignment throughout the full product lifecycle.\nKey Responsibilities\nMechanical Requirements Management\nLead the creation, ownership, and maintenance of the Missile Airframe Task Requirements Specification (TRS), ensuring a clear, structured, and traceable response to the overarching Missile TRS.\nEnsure mechanical and thermal requirements are unambiguous, verifiable, and consistently interpreted across all missile variants and development teams.\nManage requirements flow-down, allocation, and change control, maintaining alignment between system intent and lower-level requirements.\nAct as the authority for mechanical requirements interpretation and compliance status.\nInterface Definition & Control\nDefine, manage, and control mechanical and thermal interface requirements, ensuring consistency across system, sub-system, and equipment boundaries.\nOwn the mechanical interface requirements with the launcher, ensuring compatibility with system constraints and customer expectations.\nCoordinate interface inputs across multiple disciplines, maintaining clear ownership, documentation, and change governance.\nServe as the mechanical requirements and interface focal point between systems engineering, detailed design teams, suppliers, and external stakeholders.\nModularity, Reuse & Requirements Governance\nApply and enforce Generic Missile Architecture (GMA) policies through robust requirements definition, supporting modularity, reuse, and commonality across product variants.\nEnsure requirements packages enable common solutions while clearly identifying variant-specific constraints.\nPromote disciplined requirements governance to support lifecycle cost reduction, configurability, and long-term product evolution.\nVerification, Validation & Compliance\nDefine and own the mechanical verification and validation strategy, clearly linking each requirement to an appropriate means of compliance.\nDevelop and maintain airframe proving logic, ensuring mechanical and thermal requirements can be objectively verified.\nTrack and report mechanical compliance status against the Airframe TRS, supporting design reviews, audits, and certification milestones.\nContribute to the evidence base required to achieve Certificate of Design and other regulatory approvals.\nCustomer & Stakeholder Engagement\nSupport customer engagement by providing clear, defensible rationale for mechanical requirements, interfaces, and compliance approaches.\nParticipate in technical discussions with customers, partners, and suppliers, representing the mechanical requirements package with confidence and clarity.\nSupport the management of customer expectations by providing transparent status and impact assessments related to mechanical requirements.\nPlanning & Delivery\nProduce Statements of Work (SOWs), work packages, and plans related to mechanical systems engineering and requirements activities.\nSupport programme planning, scheduling, and risk management, ensuring requirements activities are realistic, resourced, and aligned with programme milestones.\nIdentify and manage risks related to requirements definition, interfaces, and verification maturity.\nSkills & Experience\nEssential\nDegree in Mechanical Engineering, Systems Engineering, or a related discipline.\nProven experience in systems engineering within complex, safety-critical environments (e.g. aerospace, defence, missile systems).\nStrong experience in requirements engineering, including specification writing, traceability, change management, and compliance tracking.\nExperience producing and managing requirements specifications, interface control documents, and verification plans.\nAbility to operate effectively at both system and sub-system level, balancing technical rigor with programme needs.\nDesirable\nExperience working with missile, airframe, or launcher systems.\nUnderstanding of thermal management and environmental qualification requirements.\nFamiliarity with modular product architectures and product line approaches.\nExperience supporting certification, qualification, or regulatory approval activities.\nRATES OUTSIDE 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