PlantSea is a materials science company developing a seaweed-based biopolymer as a plastic-free, biodegradable alternative to PVOH, the film used in laundry capsules and dishwasher tablets. The company operates from Liverpool Science Park and the OpTIC Technology Centre in St Asaph, with a team of around 15, and is supported by impact investors.The role

PlantSea has an established network of commercial partners, and the scale of these relationships now requires a dedicated, full-time owner.

The Business Development Manager will take ownership of this portfolio, develop existing partnerships towards commercial agreements, and identify new opportunities. This is a technical, relationship-led role with long sales cycles, reporting to Rhiannon Rees, CEO and working closely with the R&D and operations teams.

Key responsibilities•      Own and manage PlantSea's existing commercial relationships, providing a professional and responsive point of contact for partners•      Progress partners through technical evaluation to commercial agreements•      Generate and qualify new leads, and manage follow-up to convert opportunities•      Conduct market research to track industry trends, map the competitive landscape and identify target segments•      Prepare proposals, presentations and sales materials in collaboration with R&D•      Maintain accurate records in the CRM, manage the pipeline and provide regular reporting to the leadership team•      Represent PlantSea at industry events, customer meetings and virtual meetings, including international travel

Essential experience and skills

•      Experience in business development or B2B sales, working with FMCG companies, brands or other B2B customers such as film manufacturers•      A track record of managing complex, long-term commercial relationships•      Proven lead generation and pipeline management skills•      Proficiency with CRM systems and productivity tools, and confidence with spreadsheets, reporting and basic data analysis•      Strong analytical skills to interpret market data and business metrics and support strategic decisions•      The ability to engage confidently with technical stakeholders and coordinate input from scientific colleagues•      Excellent written communication and presentation skills•      A demonstrable interest in sustainability, the circular economy and the reduction of plastic in consumer products

Desirable

•      A degree in Business, Marketing, Environmental Studies or a related field, or equivalent practical experience•      Experience of working in international markets•      A scientific or technical background

Benefits

Company pension, 31 days holiday entitlement including bank holidays, EMI options, How to apply

• Please send a CV and covering letter to recruitment@plantsea.co.uk by 31^st October 2026.