java English-speaking jobs in Mainz

Strengthen and manage Mollie's agency portfolio, acquiring new digital agencies and lead-generating partners. Build relationships to drive merchant acquisition and growth. Collaborate across teams to execute integrated go-to-market initiatives.

Experienced Technical Writer (m/f/d) to develop target group-oriented technical documentation for hardware & software in German and English.

Manage the lifecycle of a product portfolio, including definition, monitoring, and phase-out decisions. Support sales teams with market launches and product improvements. Collaborate with R&D, production, and marketing teams on new product launches.

Senior Research Engineer to design, develop, and maintain AI-powered Natural Language Understanding (NLU) systems for automotive and mobility markets. Develop LLM based data generation and refinement methods, dictionaries, grammar rules, and annotations.

Freelance lecturers are sought for Engineering and Energy Management programs. Responsibilities include teaching, curriculum development, examination design and grading, and student dissertation supervision. Applicants must have a PhD or PhD candidacy, prior university teaching experience, and fluency in English.

Kitchen Helper seeking to become a pizza maker. Learn dough preparation, sauce making, and baking techniques. Assist chefs with prep, cleaning, and support during service.

HiSERV seeks a Quality & ESG Specialist to ensure quality, efficiency, and environmental, social & governance standards across all operations. The role involves developing and implementing process improvements, maintaining compliance with regulations, and promoting a culture of continuous improvement.

Concept Designer (m/f/d) needed to develop and shape creative concepts for media scenography, exhibition design, and immersive experiences. Translate client goals and audience insights into clear conceptual frameworks and visual presentations. Collaborate with Creative Direction, Content, and Technical teams to ensure concept consistency and feasibility.

Dogtap Berlin seeks a Full-Time Line Cook to prepare and cook menu items according to recipes and standards. Responsibilities include maintaining kitchen cleanliness, ensuring food safety, and collaborating with kitchen and front-of-house teams. Previous line cook experience and strong understanding of kitchen operations are preferred.

Validation Engineer will build and operate cloud-based validation environments for a multi-agent AI system. Responsibilities include designing AI-assisted exploration strategies, developing coverage models and metrics, establishing validation methodologies, and building observability tooling.

Clinical Business Development Manager will identify and qualify prospective customers in Northern and Southern Europe for Vetter's clinical sites. Responsibilities include strengthening existing customer relationships, promoting Vetter through various channels, and preparing estimates and quotations. Requires a technical degree, sales experience in the pharmaceutical and packaging industry, and fluency in English and French.

Conduct research into computer-based simulation and analysis of maritime threat scenarios using sensor and infrastructure data. Develop prototypes, test methods, and present research findings.

Manage and oversee international development projects for contact and spring technologies. Introduce innovative technologies and best practices. Select materials, establish partnerships, and provide technical support.

Provide technical support to customers on innovative software solutions. Analyze and solve complex engineering issues. Contribute to product improvement in collaboration with quality assurance and development.

Sales Development Specialist for Asia-Pacific region. Drive outbound sales through cold outreach, LinkedIn, and partner channels. Own end-to-end quoting for servers, networking equipment, and colocation needs. Support clients needing remote hands, hardware installs, migrations, and DC services. Experience in IT/datacenter/infrastructure sales required. Bilingual (Chinese) required.

Experienced SAP S/4HANA and MuleSoft Architect needed to lead integration strategy and guide delivery teams in a large-scale transformation program.

Develop and produce aerospace products, focusing on lightweight solutions. Contribute to a fast-paced development process and scale manufacturing processes. Possess a degree in a related field and some experience in manufacturing or lightweight construction.

Implement defect prevention and quality engineering practices to enhance product stability and customer satisfaction. Collaborate with Product Management and Development teams to ensure high-quality software delivery.

Develops and executes the go-to-market strategy for Twitch advertising solutions in the German market. Leads market demand analysis, opportunity sizing, and tracks performance. Partners with sales teams and Ads Marketing to achieve revenue targets and drive product adoption. Requires fluency in German and English.

Freelance English tutors (m/w/d) are needed for online and in-person lessons across Germany. Support students with grammar, speaking, writing, and exam preparation. A completed higher education and strong English skills (C1/C2 preferred) are required.