frontend developer English-speaking jobs in León

AYES seeks an Engineer with experience in energy (Oil & Gas, industrial processes, infrastructures) for projects in process, piping, civil, or mechanical engineering. Requires a university degree in a relevant field, previous energy sector experience, native-level Chinese, and good English.

The International Association for Hydro-Environment Engineering and Research seeks a Communications and Marketing Manager to develop and implement communication strategies, lead marketing campaigns, and collaborate with internal teams.

Senior Project Manager to lead medium to large-scale investment accounting & administration projects. Requires 10-15 years of experience managing multi-functional, multi-geography projects in financial institutions, 3+ years with scrum/agile methodology, and fluency in English.

This role focuses on extracting insights from trading performance data and translating them into actionable recommendations for management. Responsibilities include analyzing performance against benchmarks, developing deeper analyses of underperforming regions, and supporting commercial teams with trading information.

Senior Business Analyst will support financial integrity of retail operations within the luxury goods sector. Responsibilities include ALM Lifecycle Support, Payment Reconciliation, Functional Configuration, Multi-System Troubleshooting, and Documentation & Quality. Requires SAP FICO knowledge, payment reconciliation tool familiarity, and experience in Agile environments.

IDECO Mosquiteras S.L. seeks an Export Sales Manager to develop and expand sales in France and Western Europe. The role involves identifying new business opportunities, managing key accounts, and analyzing markets. Fluency in English, French, and German is required.

As a full-time Account Manager B2B Sales, you will drive sales and close deals in the Balkan Region, building relationships with buyers and growers. You will source flower offers, manage orders, and represent Florazu at client meetings and trade events.

Velites seeks a Partner Network Sales Manager to build and scale its partner network in Germany. Responsibilities include developing and managing relationships, negotiating agreements, analyzing market trends, and representing Velites at events. Requires 3+ years of experience in sales, strong partner relationship management skills, and fluency in German and English.

Accountant will assist with all Finance-related duties and administration of assigned country suppliers. Responsibilities include A-Z accounting, invoicing, payments, bank reconciliations, KPI analysis, expense reports, and other duties as assigned.

The Communications Director will shape and lead Bioiberica's corporate communications strategy, overseeing both internal and external communications across three Business Units: Human Health, Animal Health, and Plant Health.

Wittur is seeking an Application Engineering Technician to adapt standard elevator drawings to customer specifications. The role involves using SolidWorks and PDM/PLM systems to create technical documentation, collaborating with internal and external customers, and ensuring technical feasibility.

Junior Legal Counsel to support various legal functions within the Ibero American Legal division. Responsibilities include document drafting, review, and research, administrative support, and collaborating with stakeholders. Requires a law degree, 1-3 years of legal experience, fluency in Spanish and English, and proficiency in Microsoft Office Suite.

Clinical Research Coordinator to support a clinical research site in Toledo. Part-time (20-24 hours/week) until September 30, 2026. Responsibilities include study documentation, patient support, data management, and communication. Bachelor's degree in life sciences or equivalent experience required.

As a Sales Operations Analyst, you will develop and deliver reports, analyze sales data, and collaborate with stakeholders to provide insights and recommendations.

The Commercial Operations & Business Partner will analyze inventory, margins, and sales data. They will develop sales proposals, calculate minimum order quantities, and monitor the sales cycle. The role also involves supporting the commercial team, analyzing sell-out data, and collaborating on strategic initiatives.

Manage renn's content strategy and act as the company spokesperson across social and public platforms. Define brand messaging, build content plans, and oversee social posting. Review and edit written content.

Launch Specialist will manage and maintain launch plans for new products, coordinating cross-functional teams to ensure successful launches.

Leads technical and analytical work on power system modeling, grid connection assessments, and strategic grid planning for renewable energy projects across Europe. Evaluates grid hosting capacity, connection feasibility, and system flexibility to support investment decisions. Monitors regulatory and technological developments and engages with industry stakeholders.

Experienced OT Security Engineer needed for global shopfloor security program. Implement and operate OT security controls, deploy security platforms, monitor alerts, and support incident response. Collaborate with SOC, OT, and engineering teams. Travel to manufacturing sites required.

Provides technical support for the installation, commissioning, operation, and maintenance of lithium-ion energy storage systems. Analyzes customer applications, ensures product adaptation, and resolves field issues. Trains third-party providers and supports the bidding process. Requires engineering, technical, and electrical skills, field experience, and knowledge of batteries and applications. Must have REA certification.