java English-speaking jobs in Mainz

Senior Technical Application Engineer needed for a leading semiconductor company in Munich. Support video interface software and hardware products, including high-speed SerDes products. Write software in C, C++, and Python, and assist with reference design development. Requires a degree in Computer Science, Electrical and Electronic Engineering, or similar, with experience supporting customers and colleagues. Fluency in German and English is required.

The AVI-SPL Onsite Technician provides on-site support for integrated conference rooms and meeting spaces in Hamburg. Responsibilities include installation, maintenance, and troubleshooting of AV systems, as well as customer training and support.

Drive sales of high-value capital equipment within the Enabling Technologies portfolio. Manage existing accounts and identify new business opportunities. Lead complex sales cycles, build business cases, and negotiate contracts.

Experienced Group Reporting Team Lead needed for a fast-growing deep-tech company. Prepare and review consolidated financial statements (GAAP/IFRS), lead internal control framework, and act as primary point of contact for external auditors. Lead a team of 3 and have demonstrable experience working across US markets.

This is a founding product and engineering leadership role for an AI-native company focused on deploying governed AI systems into real operational processes. The role requires someone who sees that early engagements are the engineering environment and that building inside real operations is the only path to a platform that survives contact with reality. Responsibilities include designing the architecture of an AI-native operations platform, building a small, elite product and engineering organization, and working hands-on on core platform components in client engagements.

Facility Engineer with electrical or building services background needed for data center maintenance. Responsibilities include electrical and mechanical upkeep, contractor management, and incident resolution. Training provided for switching/voltage authorizations.

Provide advanced technical support for instrument systems, troubleshooting issues and serving as an escalation point for Level I specialists. Collaborate with internal and external teams to resolve issues and document cases in the CRM system.

Leads and operates a new monoclonal antibody manufacturing unit, encompassing clinical and future commercial GMP production. Builds and manages a team of up to 50 employees, ensuring compliance with GMP, EHS, and quality standards. Drives operational readiness and smooth transition from project to routine manufacturing. Requires a university degree in a natural science discipline, several years of GMP biopharmaceutical manufacturing experience, and proven leadership skills.

Assembly/Repair Technician will assemble mechanical and electrical sub-assemblies and devices, commission and test them, and troubleshoot and repair electronic assemblies. Requires professional experience in assembly of electronic sub-assemblies, proficiency in SMD and THT soldering techniques, and basic knowledge of English, MS Office, and SAP.

RF Test Engineer to test, validate, and integrate RF systems for next-generation trapped-ion quantum computing platforms. Execute and develop validation protocols, debug RF components, and contribute to platform development.

Property Manager to support the mobilization and management of a prestigious office portfolio in Germany. Manage a portfolio of commercial office assets, act as the main point of contact for tenants, landlords, and stakeholders, and coordinate on-site teams, suppliers, and service providers.

Buena is seeking a Venture Builder to own and develop a new revenue vertical from the ground up. Responsibilities include owning the P&L, driving product development, and rolling out the vertical across existing property management operations. The ideal candidate has a proven track record of building and scaling businesses, strong commercial acumen, and the ability to learn quickly and adapt. Native-level German fluency and the ability to work from the Prenzlauer Berg office are required.

Electrical Technician / Automation Technician to support assembly, installation, and commissioning of advanced manufacturing equipment. Responsibilities include electrical installation, commissioning, troubleshooting, and international travel. Requires completed apprenticeship or vocational qualification in a related field and 2 years industry experience.

Join a small, agile team designing, coding, testing, deploying, and running production systems. Master's degree in Computer Science, Mathematics, or Physics required. Strong coding skills in C/C++, Python, or Java.

Security & Compliance Engineer with 8+ years of experience designing, implementing, and managing enterprise-grade cloud security solutions on AWS.

Leads Quality Control and Assurance activities for an ophthalmology-focused medical device manufacturer. Manages a team of five, ensuring compliance with MDR regulations and driving continuous improvement. Requires a degree in a scientific discipline and experience in a regulated manufacturing environment.

HR Business Partner will support and develop HR processes, acting as a central point of contact for employees and managers in Germany and Austria. Responsibilities include payroll processing, employee support, personnel file management, and employment law consultation.

Senior Client Partner to lead client relationships across Europe, focusing on IT services for the Manufacturing industry. Requires experience in account management, deal pursuit, and client relationship management. Strong communication, negotiation, and problem-solving skills are essential.

QHSE Engineer needed to ensure compliance with regulations and drive continuous improvement in a global technology organization. Responsibilities include risk assessment, training, reporting, and collaborating with stakeholders. Requires a bachelor's degree in a related field and experience in a technical or industrial environment.

Leads influencer marketing strategies in Germany, managing influencer partnerships, content creation, and performance analysis. Supports local social media operations across LinkedIn, Instagram, and Facebook.