student English-speaking jobs in Castelló de la Plana

Photonics Packaging Engineer to design, develop, and qualify packaging processes for III-V photonic integrated circuits. Requires PhD or Master's degree in a related field and minimum five years experience in photonic packaging.

Develop and execute social media content, create corporate materials, and conduct trend analysis for employer branding. Collaborate with teams to support cross-functional initiatives. Must be pursuing studies in a related field, fluent in English and French, and have experience with AI/OpenAI tools.

Field Sales Representative to manage operations across Spain and Portugal, requiring 2-4 years of experience in FMCG, food distribution, or wholesale. Must be punctual, detail-oriented, and adaptable. Fluent Spanish is required, additional languages are a plus.

Manages the tactical execution of the global PR and communications strategy. Responsible for driving the lifecycle of PR tools, coordinating media requests, and supporting event planning. Acts as the primary liaison for regional PR offices and agencies.

Sales Director (Europe) to manage a multi-million euro sales book and drive customer strategy for a fast-growing specialist ingredients group.

Product Engineer to develop vehicle components and accessories for a major automotive OEM. Requires a degree in Mechanical, Automotive, or Industrial Engineering, 3-5 years of experience in product design and development, and proficiency in Catia V5.

Manages the tactical execution of the global PR and communications strategy. Responsible for driving the lifecycle of PR tools, coordinating media requests, and supporting event planning. Acts as the primary liaison for regional PR offices and agencies.

Senior Java developer to build and scale core platform services in a distributed, event-driven environment. Experience with iGaming, FinTech integrations, payments gateways, Kafka or RabbitMQ, and Redis required.

The Sales Support & Client Engagement Coordinator Intern supports the sales team by managing lead distribution, assisting with client onboarding, and driving engagement through outreach initiatives. This role works closely with the Director of Sales to support the growth and tracking of the Safety Stock Program.

Provides legal advice and support on corporate and commercial matters, including intragroup contracting and IP-related advisory. Supports the design, implementation, and operation of the company's AI governance framework, partnering with stakeholders across Legal, Compliance, Privacy, Security, Product, Technology, Finance, and Business teams.

Account Executive to manage the full sales cycle for the Dutch market. Requires fluency in Dutch (C2) and English (B2), 6-12 months of B2B/B2C sales experience, and strong negotiation and communication skills.

AI Engineer specializing in LLMs and agent workflows to architect, build, and refine AI agents for a corporate training platform. Requires experience building and deploying AI agents, deep LLM understanding, and strong agent architecture and prompt engineering skills.

Junior Researcher will conduct hands-on research and development focused on battery recycling activities, including Li recovery and direct recycling. Responsibilities include cell preparation, electrochemical testing, materials characterization, and data analysis.

Senior Fiduciary Accountant will manage accounting, reporting, and invoicing for multiple companies. Responsibilities include bank reconciliations, tax filings, annual accounts preparation, and cash flow analysis.

Lead and manage a Spanish subsidiary specializing in road signage equipment and urban infrastructure solutions. Develop and execute marketing and operational plans to achieve revenue, margin, and profitability targets. Build relationships with key accounts, including international and public-sector clients.

Manage end-to-end relationships with agency partners and high-value creators. Onboard new clients, provide ongoing support, and identify growth opportunities. Educate clients on platform functionality and best practices. Collaborate with internal teams to drive client success and product development.

Lead growth, operations, and strategy for Switzerland, Spain, and Portugal. Drive revenue expansion, manage P&L, and lead local teams. Proven experience in senior IT services or software leadership with multi-country management and P&L responsibility required. Fluent English, Spanish and/or Portuguese preferred.

A well-funded startup seeks a Senior Data Scientist to build and deploy ML models, AI agents, and predictive solutions. Responsibilities include developing agent workflows, applying statistical rigor to psychometric data, and translating findings into actionable insights. Strong Python, ML frameworks, and SQL skills are required.

Lead the design and implementation of scalable Palantir Foundry solutions for a major enterprise data transformation program in Spain.

Telecommunications Infrastructure Project Manager to lead ICT installations on Data Center projects, primarily structured cabling. Manages project schedule, costs, site operations, and team performance. Requires 3-5+ years' experience in similar roles and strong communication and interpersonal skills. Willingness to travel between European countries.