A leading provider within the environmental engineering and water treatment sector is seeking an experienced Commissioning Engineer to join their growing team. This is a fantastic opportunity to work on cutting-edge water treatment projects that contribute directly to sustainability and ecological transformation. The successful candidate will play a key role in bringing complex systems from mechanical completion through to full operational readiness, ensuring all technical, safety and contractual standards are met. This multifaceted, field-based role offers autonomy, progression and the chance to work within a large, established company. Key Responsibilities: * Work alongside the Commissioning Manager to deliver the full commissioning process safely, efficiently, and in line with project requirements. * Coordinate and manage commissioning activities, ensuring equipment, resources and personnel are effectively allocated to meet project deadlines. * Participate in design reviews and contribute to control philosophies, risk assessments, commissioning plans and technical documentation. * Conduct system tests, troubleshoot issues and analyse performance data to ensure operational excellence. * Maintain strong communication with clients, stakeholders and internal teams to support smooth project delivery and high levels of customer satisfaction. The ideal candidate will have: * Proven experience as a Commissioning Eng...