Senior Mechanical Stress Engineer

Senior Mechanical Stress Engineer - Part 21J, Aircraft Modifications £60,000 - £80,000 base + benefits Dublin OR Frimley (Farnborough Area) - Hybrid About the Opportunity We are hiring for a Senior Mechanical Stress Engineer to lead the structural substantiation and certification of large commercial aircraft modifications within an EASA Part 21J Design Organisation environment. This is a senior-level technical role offering the opportunity to act as a stress and certification focal point, lead complex engineering activities, and mentor other engineers across multiple high-profile modification programmes. Key Responsibilities - Lead structural analysis and certification activities for commercial aircraft modification programmes - Act as the technical authority and focal point for stress and structures-related queries - Perform and review hand calculations, classic stress analysis and FEA - Prepare and approve structural substantiation reports and certification documentation - Ensure compliance with EASA/FAA airworthiness regulations and DOA processes - Support design reviews, risk assessments and technical decision-making - Mentor and coach junior and mid-level engineers - Represent engineering at customer and programme milestone meetings (PDR, CDR, FAI, etc.) - Collaborate with global, cross-functional engineering teams across multiple time zones Typical Project Scope You may support certification and integration of: - Seating installations - Galleys, lavatories, monuments and VVIP interiors - Cabin layout and LOPA changes - LRU installations and PSU reconfigurations - Antenna and equipment installations - Fuselage and primary structure modifications Skills & Experience Required - Degree in Aerospace, Aeronautical or Mechanical Engineering - Current or recent experience within an EASA Part 21J Design Organisation (or equivalent) - Strong background in aircraft stress analysis and structural substantiation - Proficient with hand calculations, classical methods and FEA tools - Experience compiling technical reports and certification artefacts - Working knowledge of EASA airworthiness regulations (CS-25 / FAR 25 / ETSO) - Experience supporting certification of aircraft interior and/or primary structure modifications - Ability to manage multiple projects and prioritise effectively - Excellent communication and stakeholder engagement skills Highly desirable: - Previous experience acting as a Compliance Verification Engineer (CVE) - Experience leading technical reviews or acting as a subject matter expert - Mentoring or team leadership experience About You - A confident technical specialist and problem solver - Comfortable leading complex engineering decisions - Detail-oriented with strong professional integrity - Able to influence stakeholders and customers - Passionate about mentoring and raising engineering standards What's on Offer - Work on large-scale, real-world commercial aircraft modifications - Senior technical ownership and influence - Exposure to global airline customers - Structured career progression within a Part 21 environment - Collaborative engineering culture - Competitive salary and benefits