java English-speaking jobs in Mainz

Novastone Capital Advisors seeks motivated professionals to acquire and lead a small to mid-sized German company as CEO. Successful candidates will manage the acquisition process, develop business strategy, and drive growth. Must have 15+ years of experience, 5+ years in leadership with P&L responsibility, and a proven track record of running businesses in Germany. Fluency in English and German is required.

The DZNE seeks an infrastructure engineer to design, operate, and develop central HPC and scientific computing systems. Responsibilities include installing, configuring, and troubleshooting HPC hardware, participating in cluster planning, and operating scientific computing infrastructure across data centers.

Expat Dispatcher (m/f/d) for Purchasing & Logistic control in Craiova, Romania. After training in Germany, you will set up inventory control and storage management. Responsibilities include controlling goods receipts, managing inventory, coordinating deliveries, and handling urgent buy part recovery. Requires vocational training in freight forwarding or industrial clerk with logistics experience and SAP skills.

As a Principal, you will leverage deep industry expertise to lead complex client projects, develop strategic frameworks, and cultivate client relationships. You will supervise cross-disciplinary teams, mentor talent, and drive project management.

Internship in Data Engineering/Data Science supporting innovation and strategy. Develop data pipelines, BI products, and automation solutions. Analyze data, build predictive models, and collaborate across functions.

HR & Administration Specialist to support HR operations and office administration. Responsibilities include full employee lifecycle support, contract management, recruitment assistance, and office coordination. Requires fluency in German and English, 1-3 years of relevant experience, and strong organizational skills.

Lead and scale the Mid-Market sales organization across EMEA for a fast-growing AI-powered B2B SaaS company. Build, hire, and manage a team of sales professionals, design sales processes, and drive both new business and customer expansion.

Research Associate for a project focused on quantum simulation of frustrated spin models in 3D using Rydberg atoms in optical tweezers. Duties include research, characterization of Rydberg excitation, and implementation of Rydberg blockade fidelity. Requires a Master of Science in experimental physics with experience in neutral atoms, optical tweezer arrays, and Python programming.

Fatigue & Damage Tolerance Stress Engineer will participate in F&DT stress activities for major structural components across all serial programs. Responsibilities include contributing to certification activities, supporting damage correlation for fatigue tests, and participating in airworthiness subjects.

Establish computational pipelines for single-cell multi-omics data analysis and integration to reconstruct gene regulatory networks in 3D forebrain organoids. Design a web platform for visualization and usage of multi-omics datasets. Integrate data with in-house and public datasets for biological interpretation.

Plans, develops, and executes fire protection, certification, EMS, and physical fitness training programs. Conducts structural and live-fire exercises, manages training facilities, and coordinates with USAG, military, and Host Nation partners. Delivers instruction, monitors instructors, conducts post-exercise critiques, and maintains training records. Provides technical guidance on fire laws and codes to senior garrison leadership and supports the Fire Chief in personnel and administrative management. Responds to emergency incidents and manages the Fire Alarm Control Center in the absence of the Assistant Chief of Operations.

Team Lead (Wind turbine Installation & Dismantling) Your responsibilities Lead and supervise teams on site Plan, coordinate, and delegate daily activities Ensure compliance with safety and quality standards Support project coordination and client communication Provide technical guidance and resolve on-site issues Monitor project progress and quality Complete project reporting and documentation Men

Electrician responsible for maintenance, repair, installation, and documentation of electrical systems. Requires vocational training, practical experience, and proficiency in German and English.

Experienced General Counsel to advise CEO, executive team, and Board on legal, commercial, and strategic matters. Lead commercial growth through negotiation and management of key agreements. Manage legal function, external counsel, and support strategic projects. German-qualified lawyer required.

Support compliant technology and product development with a focus on biological safety. Lead biological safety evaluations, serve as a technical contact for biocompatibility topics, and collaborate with cross-functional teams.

Leads a sales team in the Germany North region, achieving customer satisfaction, business development, and order intake targets. Implements Vestas' sales strategy for the region, guides and develops sales managers, and builds relationships with key customers. Requires 10+ years of professional experience, 5+ years in commercial and leadership roles, and fluency in German and English.

Evaluate search results and AI-generated content for quality, relevance, accuracy, and usefulness. Conduct online research to verify information and apply rating guidelines consistently. Document edge cases and provide clear written feedback.

Financial Crime Monitoring & Analytics Specialist to develop and optimize AML and Fraud Prevention framework. Focus on transaction monitoring, risk analysis, system optimization, and regulatory compliance. Requires experience with transaction monitoring platforms, data analysis, and financial crime regulations.

Medical Scientific Liaison for Rare Diseases will build relationships with KOLs, provide scientific exchange, and support clinical development. Requires advanced scientific degree, MSL experience, and expertise in Rare Diseases. Must be fluent in German and English.

Senior Machine Learning Expert to design, build, and optimize large-scale machine learning systems for identity verification products. Collaborate with ML scientists, engineers, and product stakeholders to productionize AI models. Develop scalable Python-based backend services and microservices architectures.