java English-speaking jobs in Mainz

Senior Clinical Research Associate (CRA) to oversee and manage clinical trial activities ensuring protocol, regulatory, and industry standard adherence.

Create a memorable dining experience for guests by efficiently managing orders, providing menu recommendations, and ensuring a clean and inviting atmosphere. Prior experience in the catering industry is preferred, but a positive attitude and willingness to learn are essential.

Own the performance of the German branch network, including cost structure, operational efficiency, and output. Lead and develop cross-functional teams, drive network optimization, and ensure alignment between local execution and global strategy.

Senior Engineer responsible for designing stage separation mechanisms, fairing separation mechanisms, actuators, and umbilical systems for the Spectrum Launch Vehicle. Requires 8+ years of experience in full cycle design engineering, including CAD, analysis, assembly, and test.

Category Manager will own the end-to-end category management process for consumer electronics, developing strategies with suppliers and analyzing market data.

Deliver groceries to customers efficiently by e-scooter or e-bike. Maintain a high level of customer service and consistently meet delivery targets. Must be at least 18 years old with a valid driving license and work permit for Germany.

Develop business in the aerospace sector, focusing on head-up-displays, lighting, sensor technology, displays, and HMI solutions. Analyze market trends, identify business potential, and acquire new customers.

Freelance AI trainer needed to design computational chemistry problems requiring Python programming. Must have a chemistry degree, Python proficiency, and experience with numerical methods in chemistry.

Senior HR Operations Supervisor will own and drive operational HR processes in Germany, ensuring compliance with German labor law. Develop and standardize HR processes across Europe, collaborating with local HR teams. Support audits and drive consistency of HR standards.

Working student (f/m/d) in Electrical Engineering Support for at least 1 year. Support Application Engineering team on customer projects, including scheduling, technical interface clarification, and product documentation. Create and maintain technical documentation and assist with processing technical work packages.

SAP CO Functional Consultant needed for 6+ month remote project. Drive ERP transformation, ensure stable operations, and partner with global finance stakeholders. 10+ years ERP experience with strong SAP CO expertise required.

Category Leader will define and execute category strategy for industries such as Fashion, Beauty, and Consumer Electronics. Responsibilities include leading a team of Business Development Managers, onboarding major brands, and driving category P&L performance. Requires 5+ years of experience in Business Development, Category Management, or a similar role, with a proven track record of onboarding high-profile brands. Must be a C1 or native German speaker with strong English communication skills.

The Jena School for Microbial Communication (JSMC) and the Cluster of Excellence ‘Balance of the Microverse’ are seeking Doctoral and Postdoctoral Researchers to commence in 2026. Successful candidates will have a Master’s degree or PhD in Natural or Life Sciences and a strong interest in microbial communication research.

Senior Quantity Surveyor for international Main Contractors. Manages projects, prepares budgets and estimates, generates progress reports, and handles final account preparation. Requires 8+ years of experience, proven track record with subcontractors and clients, and proficiency in Quantity Surveying software.

Senior Jira Administrator to support and strengthen an existing Jira team. Design and implement workflows, administer Jira instances, analyze processes, and implement integrations.

Technical Customer Assurance Manager provides expert technical support to major enterprise customers in Germany. Resolves hardware, software, and network issues, partners with customers on deployments, and delivers technical training. Requires a technical degree, strong PC expertise, and fluency in German and English.

Senior Verification & Validation Engineer will own the end-to-end V&V strategy for autonomous interceptor systems. Responsibilities include translating requirements into testable criteria, designing and executing V&V activities across simulation, software, hardware, and system levels, and validating system behavior under real operational conditions.

Lead and develop a team of eight People Ops and Payroll partners across Germany, the UK, Ireland, the Netherlands, Denmark, and Belgium. Map, redesign, and scale core processes across the employee lifecycle, ensuring accuracy, compliance, and efficiency. Identify and implement automation opportunities using no-code and low-code tools. Partner with Finance, People Partners, Legal, and Compliance to ensure payroll accuracy and regulatory alignment.

This OB/GYN position involves managing obstetrics and gynecology care, including prenatal and postpartum care, diagnosing and treating conditions, performing surgeries, and providing patient counseling.

Shape the future of HR and contribute Generative AI to people topics in this 12-24 month trainee program. Gain experience in HR Business Partner tasks, strategic projects, and GenAI specialization. Develop strategies for integrating HR tech solutions, analyze trends, and optimize candidate and employee journeys.