Senior Geotechnical Engineer (Contract - Inside IR35) Location: London, UK (Hybrid - minimum 3 days per week in office, negotiable) Start Date: 23 February 2026 (or as soon as possible thereafter) Contract Type: Fixed-term contract with option to extend (approx. 2 months) IR35 Status: Inside IR35 Spencer Ogden is supporting a major offshore energy project and is seeking an experienced Senior Geotechnical Engineer to join an engineering team delivering offshore site characterisation and jack-up installation support. This is a high-impact contract role suited to a senior professional with strong offshore geotechnical expertise and the ability to work across multiple workstreams in a fast-paced project environment. Key Responsibilities The role will cover both traditional offshore site characterisation and support to jack-up activities, including: Reviewing leg penetration and spudcan-quay wall interaction analyses produced by consultants Reviewing leg penetration analyses and vessel suitability assessments Delivering high-level jack-up installation assessments using established in-house tools and methodologies Supporting the scoping, planning and execution of offshore geotechnical site investigations and laboratory testing Analysing and interpreting large geotechnical datasets to produce high-quality site characterisations Deriving engineering soil and rock parameters to support foundation, cable design and installation assessments Supporting engineering assessments related to jack-up installations Contributing to wider offshore wind farm site characterisation and related engineering activities Undertaking other tasks aligned with senior geotechnical competencies as required Key Skills & Experience To be successful in this role, you will have: Proven experience in offshore site characterisation and analysis of in situ and laboratory geotechnical data In-depth experience planning, scoping and executing offshore geotechnical site investigations Strong experience with Leg Penetration Analyses and engineering assessments for jack-up installations Proven capability in processing and validating geotechnical data, including AGS data handling Extensive experience producing Geotechnical Interpretation Reports (GIRs) A solid understanding of geotechnical inputs to foundation and cable design, installation constraints, and engineering interfaces Strong analytical, communication and stakeholder management skills The ability to manage multiple tasks in parallel with a high level of personal responsibility and accountability A results-oriented mindset Fluency in written and spoken English Additional Information Primary working location is London, with hybrid flexibility by agreement The role is offered on a contract basis with potential for extension You will work within established quality assurance procedures and digital engineering platforms We are currently seeking a highly skilled and experienced Geotechnical Engineer to join our team in London. As a Geotechnical Engineer, you will be responsible for providing technical expertise in the field of geotechnical engineering, with a focus on site investigation, analysis, and design. Key Responsibilities: Conducting site investigations and geotechnical assessments Preparing geotechnical reports and recommendations Designing foundations, retaining walls, and slope stabilization measures Providing technical support to project teams Ensuring compliance with health and safety regulations Required Skills and Experience: Minimum of 5 years of experience in geotechnical engineering Proficiency in geotechnical analysis software Strong knowledge of soil mechanics and foundation engineering Excellent communication and problem-solving skills Ability to work independently and as part of a team Chartered Engineer status preferred If you meet the above criteria and are looking for an exciting opportunity to further your career as a Geotechnical Engineer, please apply now.