java English-speaking jobs in Mainz

Lead hands-on implementation of AI-driven solutions using NLP, LLMs, and speech technologies. Build robust, production-ready systems by translating business needs into technical AI applications on Azure. Requires strong Python skills and a delivery-focused mindset.

Electrical Engineer for Seat Integration develops and documents complex electronic and electrical system requirements for commercial aircraft passenger seats. Responsibilities include reviewing supplier data and drafting design documentation.

Machine Operator sets up, operates, and monitors production equipment, including contour and waterjet cutting machines. Responsibilities include data recording, issue resolution, and maintaining safety standards. Technical training is required.

Build and own the credit function in Germany for a fast-growing fintech. Design credit policy, manage underwriting, monitor portfolio performance, and ensure regulatory compliance in the German market.

Deliver groceries to customers efficiently by e-bike or e-scooter. Meet and exceed delivery targets while providing exceptional customer service. Earn at least €13.90 per hour plus tips.

Operations Manager to lead teams and drive operational excellence at a new Amazon site. Responsibilities include managing Area Managers, analyzing performance, and implementing improvement initiatives. Fluency in German and English is required.

Intern support for a private equity firm focusing on alternative investments. Responsibilities include reviewing investment opportunities, analyzing business models, and assisting with valuations and due diligence. Requires fluency in German and English.

Senior Finance Manager to shape and deliver the financial strategy for the Lingen Refinery. This role advises senior leadership, drives financial performance, and supports strategic decision-making while ensuring robust financial control.

Associate role in Private Credit for a mid-market investor. Responsibilities include analyzing opportunities, financial modeling, credit underwriting, and managing private debt investments across DACH and Europe. Requires 2-5 years in Leveraged Finance or Private Credit, and fluency in German and English.

As Shopper Insights Manager, you will drive growth for PepsiCo in the German market by providing data-driven insights. You will partner with various teams to shape strategies and influence key business decisions.

Legal Practitioner needed to co-deliver a 3-hour online workshop on AI in legal practice. Requires a licensed attorney with 5+ years of experience and daily AI tool usage. Must guide participants on AI risks and verification.

Design and develop high-end C++ components for medical desktop applications, focusing on performance, stability, and scalability. Architect, implement, and review complex multithreading and parallelization concepts. Analyze, refactor, and optimize existing codebases, identify bottlenecks, and raise product performance and quality.

Principal Regulatory Program Director to architect global strategy for complex technologies, including drug-device combination products. Drive portfolio delivery, shape global policy, and build internal regulatory capabilities. Requires 15+ years in regulatory affairs.

Precision Mechanic develops and maintains scientific instrumentation by manufacturing precision mechanical components, specializing in turned parts. The role involves advising engineers, repairing instruments, and managing workshop operations.

Dental Assistant performs clinical restorative and prophylactic treatments, including scaling and preparing dental restorations. Requires vocational training and one year of experience. C1 proficiency in English and German is required.

Production Technician to assemble and adjust optoelectronic components and high-tech microscopes. Tasks include quality testing and device commissioning. Requires technician training in mechatronics or electrical engineering.

Student Assistant role in Strategic HR within the Maritime People Team. Responsibilities include researching HR practices, analyzing people data, and supporting leadership and engagement initiatives. Requires English proficiency and a current degree in HR or Organizational Development.

Senior UX Researcher needed to drive strategic decisions by designing and executing complex qualitative and quantitative research. Requires 5+ years of experience, strong research skills, and fluency in German and English.

Business Intelligence Engineer to transform Amazon-scale operational data into actionable insights for automation design. Utilize SQL, Excel, and analytical tools to support product managers and drive operational excellence.

Construction Site Worker to support M&E installation teams on a high-spec semiconductor project. Responsibilities include assisting trades, material handling, maintaining site cleanliness, and adhering to strict safety and cleanroom standards.