java English-speaking jobs in Mainz

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.

Leads and manages sales and relationship management resources across Northern Europe, driving execution of the Europe sales strategy to achieve financial targets. Builds relationships with key stakeholders and identifies business growth opportunities. Ensures robust governance and compliance.

Project Manager to lead a major compliance transformation program at a Tier-1 Frankfurt-based investment bank. Manage end-to-end program delivery across financial crime and compliance workstreams. Strong PM experience on financial services transformation programs and exposure to Tier-1 banks required.

Home Language Tutor to support Dutch-speaking students (ages 3-12) in an international school setting. Collaborate with teachers to nurture language skills, cultural identity, and integration within the IB Primary Years Programme.

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

Acoustic Validation Engineer needed to establish and evolve validation labs and processes for AI-based and traditional audio technologies. Responsibilities include designing test environments, executing objective and subjective audio tests, collaborating with engineers, and evaluating partner products. Requires a degree in a related field, experience with acoustic validation, strong listening skills, and programming experience.

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.

Senior Engineer for Optical Design will develop next-generation Augmented Reality (AR) systems. Develop software tools for optical design and analysis, prototype waveguide and component concepts, and design experiments. Requires MS in Optical Engineering or related field, strong Python programming skills, and proficiency with optical simulation tools. Experience with Monte Carlo tolerancing, sensitivity studies, and algorithmic analyses is desired.

Production employee needed for a fast-growing deep-tech company. Assemble core components and cryostats, following production documentation.

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

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.

Bartender (part-time/working student) to join a team creating memorable guest experiences. Prepare and serve drinks, build connections with guests, and contribute to a positive team culture. Basic knowledge of wine, spirits, and beer, previous bartending experience, and fluency in English are required.

Leads a team of engineering specialists in the engineering of Power Plant and Hydrogen business initiatives. Manages engineering-related risks and opportunities, ensuring compliance with technical contract execution and documentation standards. Experience in power plants and equipment, including site and commissioning work, is preferred. Strong customer focus and ability to lead a globally dispersed engineering team. Excellent spoken and written English; additional languages are an advantage.

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

Software Engineer to build AI-driven features for users. Focus on RAG pipelines, knowledge graphs, context engineering, and agentic workflows. Translate AI capabilities into scalable product functionality.

Support the Brand Communications team in executing media initiatives for the EMEA region. Assist with brand campaigns, experiences, and developing brand awareness in new markets. Draft press materials, support media partnerships, and handle requests from media and PR agencies.

As a Sales Assistant, you will provide excellent customer service, represent the Fred Perry brand, and contribute to a positive team environment. You will assist with store operations, product knowledge, and customer feedback.

Product & Solution Engineer to design and support C&I energy storage solutions in Germany. Develop technical proposals, conduct feasibility assessments, and provide sales and customer support. Minimum 3 years experience in solar, PV, BESS required.

Delivers security as a service to operational sites across the end-to-end supply chain. Supports business continuity by contributing to emergency planning, identifying vulnerabilities, and managing risk with local management and external stakeholders. Conducts investigations and ensures compliance with Amazon global security standards.

Develop and optimize truck frame components, including crossbeams and structural parts, using CATIA V5 and Windchill. Collaborate with various teams to design modular and weight-optimized chassis structures.