frontend developer English-speaking jobs in Castile and León

Plans, designs, organizes, supervises, and reports on clinical trials contracted to CROs. Focus on pharmacokinetic (PK) and bioequivalence (BE) trials. Supports study design, day-to-day management, and documentation. Coordinates with CROs, internal teams, and Health Authorities.

Develop, launch, and optimize paid social ads for Facebook and Instagram. Responsibilities include creative strategy, ad performance analysis, and Meta Ads Manager execution. Requires hands-on experience with Meta Ads Manager, Triple Whale, and strong analytical and writing skills.

Shape the intelligence of a chatbot by defining how GenAI and linguistic techniques are used to understand user intent. Lead dialogue quality assurance, refine the customer experience, and train and refine language models. Troubleshoot conversational issues and design fallback strategies. Analyze voice and omnichannel behavior and handle sensitive situations with empathy. Bridge the gap between technical development teams and linguistic data.

Embedded Software Tester will design, develop, and execute test strategies for embedded software systems. Responsibilities include creating test cases, developing automated test frameworks, and analyzing test results. The role requires experience in embedded software testing, scripting and programming languages, and version control tools.

Candidate Support Advisor needed for a software company in Barcelona. Provides recruitment support, manages job postings, coordinates interviews, and handles offer and hire processes. Requires 2+ years of recruitment experience, fluency in English, and proficiency in Workday Recruiting (WDR).

Leads the design and execution of strategic initiatives ("Big Bets") across the organization's ecosystem, blending strategic vision, cross-functional leadership, and operational excellence. Collaborates with business unit leaders and centers of excellence to co-create strategies, launch growth initiatives, and ensure alignment with HBX's priorities.

Experienced Plant Manager needed to lead operations of a 150,000 tonne per year biomethane facility. Responsibilities include production optimization, financial management, safety compliance, and team leadership. Requires engineering degree and 3-5 years of industrial plant experience.

As a Store E-Merchandiser, you will manage promotional roadmaps, ensure optimal site performance, and collaborate with teams to drive sales. You will analyze data, create content, and implement campaigns while adhering to brand guidelines.

Consolidation & Reporting Specialist will prepare and execute financial consolidation for group entities in Colombia, Peru, and Spain. The role involves coordinating, reviewing, and validating financial information, performing intercompany eliminations and variance analysis, and preparing reports for the UK Head Office.

Senior Embedded Software Engineer to design, develop, and maintain real-time embedded software for space and aerospace applications. Lead software development activities, ensuring compliance with industry standards. Minimum 10 years' experience developing embedded software in safety-critical industries. Strong C programming skills and experience with tools like Git and SVN.

Leads business development and strategic sourcing activities in China, driving market growth, client acquisition, and supplier negotiations. Manages budgets, analyzes market trends, and ensures compliance with regulatory standards. Requires 3+ years of B2B pharmaceutical sales or business development experience and fluency in Mandarin and English.

Customer Support Representative providing phone, email, and chat support to customers in Dutch and French. Must have native fluency in both languages, proficiency in English (B2 minimum), and 1+ year of customer service experience. Automotive industry experience and familiarity with electric vehicles are a plus.

Manages internal audit processes, including conducting reviews to evaluate business process and application systems controls. Prepares audit reports, maintains stakeholders informed on progress, and participates in a global Internal Audit Competency Center.

Ensures products, packaging, and operations comply with global food laws and sustainability standards. Validates multilingual labels, ingredients, and marketing claims to minimize compliance risks. Monitors changes in international legislation and partners with R&D, Sourcing, and Marketing on product launches and market expansions.

Lead Systems Engineer needed for a fast-growing space technology company. Responsible for technical definition and execution of a next-generation satellite platform, including system architecture, requirements management, and cross-functional technical leadership. Must have over 7 years of experience in space systems engineering with a proven track record of leading satellite platform development.

Leads and coordinates a team of AI engineers and data scientists, defining and owning the AI product roadmap. Translates business requirements into technical direction and priorities, ensuring delivery of high-quality AI solutions. Responsible for defining target segments and use cases for AI solutions, supporting sales and pre-sales activities, and contributing to proposal development.

Junior Copywriter to create B2B content (email, LinkedIn, landing pages) in Spanish and English. Part-time (20 hours/week) role with growth potential. Must have native Spanish, high-level English, and basic B2B marketing knowledge.

Molin AI seeks a Social Media Content Creator to develop and execute video and image content for various platforms. This role involves generating original ideas, collaborating with founders in Barcelona, and capturing content at events. The ideal candidate is a creative individual with experience in video and image production, a strong understanding of the startup and AI ecosystem, and the ability to work quickly under pressure.

Experienced Onsite Support Engineer needed to provide technical support, troubleshooting, and IT assistance to end users. Must have 2+ years of experience in Desktop Support, strong Windows, Mac OS, and Linux experience, and proficiency with Active Directory, remote desktop tools, and networking protocols. Fluency in English and Spanish required.

Clinical Scientist will develop clinical development plans, design protocols, analyze study data, and contribute to scientific communication. Requires a scientific degree and 5-10 years of experience in clinical development.