java English-speaking jobs in Mainz

This 18-month Young Graduate Program accelerates development in aseptic fill & finish manufacturing and sterility assurance. You will gain hands-on experience in aseptic filling operations, learn about sterile manufacturing environments, and contribute to data-driven improvements in process robustness and compliance.

Responsible for administrative service support for local, expatriate, and business travel employees in Germany. Optimizes and implements administrative service processes and standards based on company policies and local business needs. Coordinates daily office operations, including meeting organization, client reception, and EHS safety management. Collects service requests, identifies service shortcomings, and drives continuous improvement. Manages administrative suppliers, expense review, and payment. Requires a bachelor's degree or above, at least 3 years of administrative experience, and proficiency in English and German.

Internship at DHL's IoT Center of Excellence focused on IoT prototype development (embedded design). Assist in creating an IoT sensor prototype, software development, and testing. Learn about agile ways of working and project processes. Bachelor's or Master's degree in Electrical Engineering, Computer Engineering, or a related field required. Basic knowledge of embedded systems, sensor technology, microcontroller programming, and Linux, C/C++ or similar languages.

Logistica OS seeks a Sales Intern or Working Student to build its sales engine. Responsibilities include identifying prospects, generating qualified leads, and refining sales materials. The ideal candidate has excellent communication skills in German and English, sales experience, and is comfortable with outbound outreach.

Lead the technical direction for core systems, including subscription infrastructure, cloud foundations, and data pipelines. Modernize legacy systems and drive a pragmatic target architecture.

System Integration & Vehicle Test Engineer needed for integration, calibration, and functional testing of ECUs in test vehicles. Requires experience with test vehicles, test drives, and analysis of system behavior. Must have knowledge of vehicle dynamics, drivability parameters, and in-vehicle system integration. Familiarity with diagnostic, flashing, measurement, and test management tools is essential. Experience in one of the following domains is required: Charging & Energy, High-voltage, Battery Management, Vehicle Dynamics, Chassis, Comfort & Body functions.

The Assistant Exhibition Manager supports the Exhibition Manager in planning, executing, and managing exhibitions and events. This role involves team leadership, client communication, marketing collaboration, and on-site event oversight.

Support a UK-based company remotely in a varied role encompassing administration, operations, and internal systems. Assist with scheduling, correspondence, CRM updates, and onboarding. Provide first-line support and maintain accurate records.

The Inside Sales/Service Representative retains, supports, and grows the commercial service business in their territory. This role drives process improvements in service contract business and sells contracts, including pricing and proposals.

Prepare and cook food according to recipes, quality standards, and food prep checklists. Use baking and measuring tools to prepare baked foods. Follow food safety handling policies and procedures. Maintain a clean and sanitary work area. Comply with company policies and procedures.

Transport Specialist needed to plan and manage oversized cargo transports, ensuring safe and efficient execution. Requires 5+ years experience in oversized cargo transport operations, native German and business English skills, and proficiency in Microsoft Office.

Experienced Freelance Site Manager needed for a 550MW solar project in Brandenburg, Germany. Manage on-site construction, contractors, and ensure HSE standards are met.

Account Manager for Transcatheter Mitral & Tricuspid Therapies will develop and execute account strategies to drive growth within a defined geography. The role requires proven sales experience in Medical Devices, knowledge of Cardiology and Structural Heart Disease, and the ability to travel extensively.

Lead and develop a team of reverse logistics specialists, managing daily operations including receiving, inspection, and processing returned products. Optimize workflows, ensure quality control, and collaborate with other departments to streamline return processes.

Walt's Comic Shop seeks a Graphic Designer to create print and digital assets, including layouts, social media graphics, website visuals, and marketing materials. Must have strong Adobe InDesign, Illustrator, and Photoshop skills, experience with print-ready artwork, and a solid understanding of typography, layout, and color.

Supports the accurate and timely accounting and reporting activities of European entities. Assists with monthly, quarterly, and annual financial statement preparation, period-end closing activities, and tax reporting. Collaborates with international finance teams, external advisors, and the Shared Service Center.

Leads the German tax compliance function for direct and indirect taxes, including preparation, review, and submission of tax filings. Oversees tax payments, accounts, reconciliations, and reporting. Establishes and maintains a German tax control framework, manages audits, and handles tax controversy matters.

This dual role combines work as a Junior Learning Manager with a fully funded Master's degree at Steinbeis University. You will contribute to global learning projects in AI and digital skills, co-create e-learnings, and manage learning logistics. The role requires a Bachelor's degree in a related field, at least 2 years of experience in Learning & Development, and strong proficiency in GenAI tools.

Junior Compliance Analyst will manage customer onboarding and KYC regulatory requirements. Responsibilities include reviewing documentation, performing compliance checks, and supporting compliance process development.

Sales Engineer Europe will develop and expand customer relationships across Europe for motion control solutions used in laser, semiconductor, and industrial automation sectors.