java English-speaking jobs in Mainz

Senior Investment Controller needed to design and implement a comprehensive investment controlling framework for a dynamic venture portfolio.

Develop utility-scale PV and BESS projects from site identification to construction readiness. Manage permitting, grid connection, and stakeholder coordination.

Network Design Engineer to support and evolve a global LAN/WAN and wireless network environment. Design, implement, and optimize network solutions, including wireless design, office moves, and upgrades. Collaborate with vendors and MSPs.

Manages and promotes Vaporesso and Dojo products in the German market, focusing on Berlin and Southern Germany. Develops client relationships, plans promotions, and analyzes market data. Requires 3+ years of experience in the vaping industry or a related field.

The Technical University of Munich seeks a Professor in "Carbon Composites" to begin in winter semester 2026/27. The professorship will be assigned to the TUM Department of Aerospace and Geodesy. The successful candidate will conduct research and teaching in carbon composite technology, with a focus on manufacturing processes and applications in aerospace, ground transportation, and energy systems.

HR Generalist will translate HR business plans into operational plans and lead HR planning for the Europe region. Responsibilities include developing and implementing HR programs, managing labor relations, advising management on labor law, ensuring compliance with legislation, and overseeing HR reporting and payroll services.

Senior Director of Sales & Marketing for EME, PTx will develop and implement commercial plans, drive market penetration and revenue growth, and analyze market trends. Requires 7+ years of experience in commercial, sales, or business development, ideally in ag tech or related industries.

Develops software for automated X-ray inspection systems, including hardware-software interfaces and electrical control panels. Designs, implements, and optimizes machine hardware, imaging, and controls. Supports service, marketing, and sales teams. Requires experience with Codesys-based PLCs and automation systems. Fluency in English and German preferred.

Intern Graphic and Motion Design (Identity, Brand Experience) will contribute to a creative team developing brand design and experience touchpoints. The intern will gain experience working with an international team and applying design concepts across physical and digital platforms.

Drive the continuous improvement of M365 and SharePoint environments, focusing on cloud governance, archiving, storage, and data quality. Design and implement concepts for archiving, retention, data classification, and permission management. Advise internal customers on governance and compliance topics related to SharePoint Online.

Produce AI-generated fashion video content for e-commerce using existing tools. Define motion direction, build reusable templates, and ensure brand alignment. Experience in video editing, motion design, and working with multiple clients is required.

Computational Scientist needed for Biomarker Development team. PhD in Life Sciences, Biology, or related field required. Strong experience analyzing biomarker and biological datasets in a scientific or clinical context. Proficiency in R and Python for data analysis and visualization.

Freelance Project Developer to support early-stage development of renewable energy projects in Germany. Focus on project origination, site acquisition, and grid connection activities.

Solar Project Manager to lead and optimize multifamily and C&I solar PV projects in Germany. Manage project delivery, coordinate teams, and ensure compliance with regulations and safety standards.

Develops marketing strategies, creates content, and manages KOL relationships to achieve monthly goals. Executes SEM campaigns, optimizes content for SEO, and collaborates with design and development teams.

Lead the full-funnel 360 degree digital strategy across paid media, creative, analytics, organic social, owned media, earned media, influencer, affiliate, CRO, and SEO for EMEA. Drive customer acquisition, retention, and lifetime value. Hire, lead, and mentor a regional Growth Marketing team. Develop and execute growth strategies and KPIs across all channels. Partner with global and EMEA teams to align campaign timelines, priorities, and messaging. Build and maintain robust performance dashboards to track KPIs. Lead full-funnel performance marketing across Meta, Google, YouTube, TikTok, and region-specific platforms. Oversee the development and lead the EMEA social strategy. Manage a seven-figure budget with measurable impact on revenue and profitability.

This Operations Manager role supports the day-to-day electricity business, coordinating tasks, tracking progress, and resolving issues. The ideal candidate has 3+ years of operations experience, strong execution skills, and fluency in German and English.

Supply Chain Quality Engineer for Printed Circuit Assembly (PCA) ensures manufacturing quality and reliability of PCBAs throughout the outsourced supply chain. Audits and develops PCBA suppliers, implements process monitoring strategies, and resolves technical issues.

This is a founding role for a new market launch, so the focus is on setting the standard for customer care in Germany. First, I'd acknowledge the issue publicly, perhaps through a brief statement on our website or social media, expressing our commitment to resolving the problem and ensuring customer satisfaction. Next, I'd prioritize a deep dive into the root cause of the damaged product issue. This involves analyzing the data: * **Frequency:** How often is this happening? * **Product:** Which products are most affected? * **Shipping:** Are there patterns in the shipping process or carrier involved? Once I have a clearer picture, I'd take immediate action to mitigate the problem: * **Temporary solution:** Offer expedited replacements or refunds to affected customers. * **Long-term solution:** Work with our logistics team to identify and address the root cause, whether it's packaging issues, carrier negligence, or a flaw in the fulfillment process. Simultaneously, I'd start building a knowledge base and training materials for the future team, ensuring they are equipped to handle similar situations effectively. Finally, I'd use this experience to refine our customer communication strategy, ensuring it's clear, empathetic, and proactive

Live studio presenters are needed for international digital entertainment platforms. Roles require fluency in a specified language (English, Dutch, Russian, Thai, or Korean), strong communication skills, and comfort on camera. Full training provided.