Senior Geotechnical​/Environmental Consultant

Posting Date - 20 Mar, 2026

STM Environmental Consultants is growing, and we’re looking for an experienced Senior Geotechnical / Environmental Consultant to join our team.

Based in Twickenham, we are a well-established geo-environmental consultancy delivering high-quality environmental and geotechnical solutions to a wide range of clients.

While STM operates independently with its own strong reputation and client base, we are also part of a wider group of geo-environmental companies. This means you benefit from the best of both worlds — the close-knit, supportive environment of a specialist consultancy, alongside the backing, collaboration opportunities, shared expertise, and increased project exposure that come from being part of a larger group.

At STM, you’ll take real ownership of projects from day one, working within a collaborative team that genuinely values professional growth and technical excellence.

You will lead and manage geo-environmental site investigations while playing a key role in client liaison, regulatory engagement, and business development.

This is an ideal opportunity for someone ready to step into (or further develop in) a senior position with project leadership and people management responsibility.

• Project managing geo-environmental site investigations
• Producing and reviewing factual and interpretative reports
• Peer reviewing technical reports
• Liaising with Local Authority regulators
• Preparing quotations and supporting business development
• Managing and mentoring junior staff

• Extensive experience in:
• Geotechnical ground investigations
• Contaminated land risk assessments
• Excellent technical report writing skills
• Experience managing projects and people
• Strong communication and client-facing skills
• Minimum 5 years’ relevant experience

• Degree (BSc or MSc) in Geo-Environmental Science, Engineering, or related discipline