Assistant Process Design Engineer - Water/Wastewater

Trant Engineering Ltd; Southampton; On-site; GBP 32,000 - 42,000; Full time

Benefits offered by this job

Company car/allowance

Hybrid working

Career development mentoring

Pension scheme

25 days holiday + 8 BH

Employee assistance program

Job summary

Trant Engineering Ltd. invites an enthusiastic Assistant Process Design Engineer to support the IDS team in delivering water and wastewater projects across the UK.

You will work on feasibility through detailed design and construction support, collaborating with civil, mechanical, electrical and ICA engineers to meet client requirements. The role involves developing process design calculations, creating PFDs and P&IDs, and contributing to technical reports while aligning with Trant’s values of

Qualifications

• Degree in Chemical/Process or related engineering with IChemE accreditation.
• Strong technical aptitude and enthusiasm for process engineering.
• Proficient in Microsoft Office applications.
• Excellent communication and teamwork skills.
• Commitment to continuous professional development.

Responsibilities

• Support the Engineering Manager and Process Design Manager in delivering process engineering solutions across Trant's UK Water Industry Frameworks.
• Assist with coordination and integration of process design activities within multi-disciplinary teams.
• Develop understanding of client requirements and project specifications, producing fit-for-purpose engineering solutions.
• Undertake process design calculations, including mass balances and related assessments.
• Assist in producing PFDs, P&IDs and supporting design documentation.
• Contribute to development of technical reports and process control philosophies.
• Support installation and commissioning activities through technical guidance.

Skills

Process engineering

Water sector knowledge

MS Office

Communication

CPD commitment

Education

IChemE accredited MEng/BEng(Hons)/BSc in Chemical/Process or related engineering

Tools

CAD software

Process modelling

Job description

Assistant Process Design Engineer - Water/Wastewater

Application Deadline: 27 November 2026

Department: Process

Employment Type: Permanent - Full Time

Location: Southampton

Reporting To: Robert Reeves

Description

Join Trant Engineering and help shape the delivery of complex, high-impact projects.

Trant Engineering is a leading EPC contractor with a strong reputation for delivering innovative engineering solutions across the UK and internationally. With over 1,000 employees and a £150m turnover, we're growing and looking to strengthen our Engineering Team with the appointment of an Assistant Process Design Engineer.

The Role

As an Assistant Process Design Engineer, you will join our multidisciplinary Innovation, Design & Solutions (IDS) team, supporting the design and delivery of projects across the UK water sector. Working alongside experienced engineers, you will develop your technical knowledge and contribute to the successful delivery of water and wastewater treatment projects from feasibility through to detailed design and construction support.

The role will involve working on projects including:

• Water treatment
• Water distribution and storage
• Wastewater treatment and recycling

IDS, Trant's in-house design team, plays a key role throughout the project lifecycle and provides technical expertise across the wider business.

Key Responsibilities

• Support the Engineering Manager and Process Design Manager in delivering process engineering solutions across Trant's UK Water Industry Frameworks.
• Assist with the coordination and integration of process design activities within multi-disciplinary engineering teams.
• Develop an understanding of client requirements and project specifications, producing fit-for-purpose engineering solutions.
• Undertake process design calculations, including mass balances and related engineering assessments.
• Assist in producing process flow diagrams (PFDs), P&IDs and supporting design documentation.
• Contribute to the development of technical reports and process control philosophies.
• Support installation and commissioning activities through the provision of technical guidance where required.

• Build and maintain knowledge of water and wastewater treatment processes and associated technologies.
• Keep up to date with industry developments, standards and emerging engineering solutions.
• Work towards taking ownership of specific process design tasks and project deliverables.
• Participate in continuous professional development activities and professional institution progression.

• Work collaboratively with civil, mechanical, electrical and ICA engineers to deliver integrated design solutions.
• Communicate technical information clearly to colleagues, clients and project stakeholders.
• Support the resolution of technical challenges through analytical problem solving and teamwork.
• Assist with design reviews and interdisciplinary coordination activities.

Uphold and promote the Company's Core Values – Care, Trust, Respect and Sustainability.

Skills, Knowledge & Expertise

• IChemE accredited MEng, BEng (Hons) or BSc degree in Chemical, Process or a related Engineering discipline.
• Strong technical aptitude and enthusiasm for process engineering.
• Proficient in Microsoft Office applications.
• Excellent communication and teamwork skills.
• Commitment to continuous professional development.

• Previous experience within the water and/or wastewater sector through placements, projects or employment.
• Working towards membership of a relevant professional institution.
• Experience of process calculations and process design documentation.
• Familiarity with process modelling and CAD software.
• Knowledge of UK water industry standards and practices.

Job Benefits

At Trant Engineering, we deliver complex, high-value engineering and construction projects across the UK. From process and water treatment to energy infrastructure upgrades, we play a key role in delivering and protecting critical national infrastructure – shaping the systems that communities and industries rely on every day.

Our teams design and deliver full EPC solutions, combining technical excellence with practical, hands-on delivery. We offer end-to-end capabilities – from concept and design through to manufacturing, construction and commissioning utilising a continually evolving in-house expertise. This means you'll work on projects that are varied, challenging and genuinely impactful.

Our multi-disciplinary teams bring together specialists in civil, mechanical, electrical, process, instrumentation, and control & automation engineering, alongside our in-house manufacturing of control panels, MCCs, PLCs and SCADA systems. With over 1,000 people and a strong, growing pipeline of work, it's an exciting time to join Trant. We are committed to helping our people succeed through our Career Development Association, providing structured support, mentoring and clear pathways to help you reach your full potential.

Whether you're starting out or looking to take your next career step, Trant offers the chance to develop, progress and make a real difference.

Our company benefits package includes.

• Competitive salary.
• Company car or car allowance (some levels).
• Mentored support within our ‘Career Development Association’, to work towards chartership.
• 24 days holiday (increasing with service) + 8 bank holidays.
• Options to buy additional holiday via salary sacrifice.
• Company Pension Scheme.
• Flexible working based on a ‘core hours’ system.
• 1 x Professional Membership paid annually.
• Hybrid working.
• Employee Assistance Program.
• Free onsite parking.
• Bike to Work Scheme.
• Discretionary annual bonus.