Freelance Senior Process Design Engineer (Outside IR35) Location: Southampton (with flexibility for hybrid working) Limited Rate - £400/500 Per day - Depending on references We are seeking an experienced Senior Process Design Engineer to support on a freelance, outside IR35 basis. This role will suit a technically strong professional with a background in process engineering for the water and wastewater sector, covering water treatment, water distribution and storage, and wastewater recycling. You will play a key role in delivering innovative design solutions and providing technical support across a range of projects. Key Responsibilities: Work as part of a multi-disciplinary design team on UK Water Industry frameworks Manage multi-discipline design interfaces and integrate process design elements into fit-for-purpose engineering solutions Lead tasks on major projects or manage several medium-sized projects with complex features Interpret and challenge project requirements from client specifications, drawings and documentation Undertake condition surveys of existing processes and assets Develop and check key process design deliverables, including: Design calculations (e.g. mass balance) CAD-based drawings (e.g. PFDs, P&IDs) Technical reports and process control philosophies Participate in and lead HAZOP meetings as Lead Engineer or Facilitator Apply expertise in hydraulics, surge analysis, sludge rheo...