Senior Process Engineer - Waste Thermal Treatment

SLR’s mission is to make sustainability happen. This requires technical solutions covering a wide range of areas – energy from waste, thermal process, carbon capture and hydrogen, to mention just a few. Interest in these and other technical solutions is growing, and our Process Engineering team is expanding. We are seeking an experienced engineer and project manager to support the origination, development and due diligence of Energy from Waste, thermal processing and carbon capture projects.

You’ll join an established, high‑performing team with deep expertise in the Energy from Waste (EfW) and thermal processing industries, contributing to a wide range of innovative, technically challenging and commercially impactful projects. You’ll work both independently and collaboratively, managing projects, supporting business development, mentoring colleagues and helping grow our team’s capability.

Based in the UK (location flexible), the role will focus primarily on EfW, thermal processing and carbon capture project origination, development, due diligence and technical delivery, with additional exposure to biomethane, AD, sustainable fuels, wastewater, recycling and circular economy projects across the UK and internationally.

The Role

You’ll lead and support the delivery of EfW, thermal processing and carbon capture projects from concept through to commissioning, working closely with clients, contractors and multidisciplinary teams. The role includes:

• Originating and managing energy from waste, thermal processing and carbon capture projects across the full project lifecycle
• Preparing concept designs, feasibility studies and technical assessments
• Reviewing third‑party designs, proposals and operational models, and preparing technical due diligence reports for funders
• Preparing technical and procurement documentation, schematics and drawings, and supporting contract management during construction
• Assisting with modelling to determine plant energy and mass balances, emissions, thermodynamic calculations and basic financial metrics
• Conducting site inspections, witnessing, verification and supervision during construction, commissioning and testing
• Troubleshooting operational plant, including thermal, mechanical and biological waste and recycling operations
• Developing client relationships, attending conferences, preparing proposals and winning new work
• Supporting other SLR teams with technical and process engineering expertise across diverse sustainability‑focused projects

You’ll collaborate with colleagues across Process Engineering, Advisory, Environmental Management & Compliance, Land & Water, and Environmental Specialist Services, with opportunities to work on complex, high‑impact projects in the UK and overseas, and the role will involve travel to client sites across these regions as required.

Rewards & Benefits

SLR’s ‘One Team’ culture is at the heart of our business, providing a collaborative and supportive environment for professional development. Through a structured career framework, regular performance reviews, and full support toward chartership, professional qualifications and licences, we offer outstanding opportunities for long‑term career progression.

Our flexible benefits & rewards package includes:

• Competitive salary with discretionary bonus
• Company pension
• Private medical insurance
• Life, income and travel insurance
• Critical illness cover
• Salary sacrifice car lease and cycle‑to‑work schemes
• Volunteering and Community Giving

We believe sustainable careers need balance, that’s why we offer:

• Flexible, hybrid and agile working
• 25 days’ annual leave plus flexible public holidays
• Buy or sell leave options
• Core working hours
• Cross‑border remote working and sabbatical opportunities

Family life and wellbeing matter at SLR:

We provide enhanced maternity, paternity and adoption leave, access to an Employee Assistance Programme, and specialist support for mental health, stress and menopause — supporting our people both professionally and personally.

About You

You’ll bring:

• A degree in Engineering, or a related discipline
• Experience in Energy from Waste, thermal processing and carbon capture sectors
• Experience managing technical projects, ideally including construction, operations or consultancy roles
• Strong numeracy and confidence with data, modelling and analysis
• Excellent report writing skills and proficiency with Excel, Word and PowerPoint
• The ability to work independently and collaboratively within a multidisciplinary team
• Strong communication skills, with a friendly, logical and organised approach
• A full, driving licence valid in the UK

Desirable:

• A relevant Master’s degree
• Chartered Engineer status (or working toward it)
• Experience with due diligence, operations, contract management or procurement
• Experience working on site, including H&S and CDM Regulations
• A commitment to advancing sustainability and environmental performance

Culture & Inclusion

Inclusion is fundamental to who we are. We are committed to equal opportunities and foster a workplace where everyone can thrive, supported by active Culture & Inclusion Committees and Employee Networks. We welcome applications from candidates of all backgrounds and are a Disability Confident Committed employer. If you require any adjustments during the recruitment process, please let us know and we will be happy to support you.

If this Senior Process Engineer - Waste Treatment role feels like a great fit for your experience and ambitions, we’d love to hear from you.