31st March, 2026 JOB SPEC TEMPLATE LEAD INFORMATION Job Title Senior / Principal Drainage Infrastructure Engineer Site location Cardiff Responsible to Senior Leadership Team / Associate Director Purpose of the role To support and help lead the delivery of civil engineering drainage design across a diverse portfolio of infrastructure projects, with a focus on SuDS and surface water management. Client brief Our client is a well-established, multi-disciplinary engineering consultancy seeking to grow their Cardiff team with a technically strong and forward-thinking drainage engineer who can contribute to both project delivery and team development. KEY INFORMATION Reason for vacancy Business growth and expansion of the drainage infrastructure team Contract Permanent Salary £50,000-£57,000 per annum depending on experience Shifts Monday - Friday (Agile / flexible working available) Holidays 24 days bank holidays (including Christmas closure) 1 additional day per 5 years' service Facilities Modern office environment with flexible / hybrid working options RESPONSIBILITIES Assist in leading the delivery of civil engineering design across infrastructure projects Lead surface water and foul water drainage strategies and detailed designs Deliver SuDS and conventional drainage solutions Manage multiple concurrent projects and prioritise deliverables Provide technical support and assist with resource planning Support, mentor and develop junior engineers Liaise with statutory bodies including Natural Resources Wales and the Environment Agency Manage Water Authority approval processes (S104, S106, etc.) Build and maintain strong client and stakeholder relationships REQUIREMENTS / EXPERIENCE 7 years' experience in surface and foul water design and/or construction Strong knowledge of Sewers for Adoption and Design Manual for Roads and Bridges Degree in Civil Engineering (Masters preferred) Chartered status with ICE or CIWEM (or close to completion) Proficient in: MicroDrainage InfoDrainage AutoCAD Civils 3D Autodesk ICM Experience with: S104 and S106 approval processes SuDS Approval Body (SAB) approvals National Planning Policy and flood risk management Demonstrable leadership and team management capability Strong written and verbal communication skills Ability to work independently and collaboratively Proactive and methodical problem-solving approach BENEFITS Competitive salary Agile and flexible working arrangements 24 days holiday bank holidays Christmas closure Additional leave for long service Life insurance and life assurance Health care cash plan Contributory pension (5% employee / 7% employer) Professional membership fees paid (ICE, CIWEM, etc.) Structured pathway to chartership External training and regular CPD Social and wellbeing initiatives Paid volunteer time Serply Recruitment Ltd acts as an employment business for temporary positions and an employment agency for permanent positions. We are committed to equal opportunity and diversity.