java English-speaking jobs in Mainz

Seeking a Co-Founder to own customer relations, growth, marketing, and social media for OfficeOS. This role requires 2+ years in high-performance environments and the ability to build customer relationships from scratch.

Oversee German operations as General Manager, bridging global strategy with local execution. Steer the P&L for Germany and Austria, driving hyper-local growth and managing key stakeholder relationships.

The Senior Global Product Manager, Digital Modeling & Data Products is responsible for the strategic direction, lifecycle management, and commercial performance of Cytiva's GoSilico mechanistic modeling and process simulation portfolio. This role will execute initiatives that leverage proprietary data, digital tools, and data-driven service models to drive customer adoption. The successful candidate will own the product roadmap, collaborate with R&D, data science, and commercial teams, and translate technical capabilities into customer value.

Working student to support product operations and data quality within a Digital Family Office. Responsibilities include investor onboarding, data validation, workflow improvement, and ad hoc analysis. Requires strong analytical skills, attention to detail, and an interest in AI-driven automation.

Senior Technical Product Manager to build cutting-edge products at the intersection of AI, Identity, Security, and Privacy. This role requires strong technical credibility, experience with APIs and system architecture, and collaboration with engineering teams.

Finance Consultant - Reporting & FP&A helps clients transform finance operations using Microsoft Dynamics 365 Finance. Requires 3+ years in FP&A/controlling/reporting, proficiency in German and English, and comfort with finance processes.

Experienced HR Business Partner needed for a European private equity firm. Requires knowledge of German labor law and European HR practices. Focus areas include talent acquisition, performance management, and organizational development. Must be fluent in English and German.

Provide first-level customer support via phone, email, and chat for Finnish-speaking customers. Process orders, create quotations, manage customer accounts, and handle returns, exchanges, and repairs.

In-house Legal Counsel for an international insurance group. Responsibilities include corporate and regulatory advice, competition matters, real estate transactions, and international contract negotiation. Requires a qualified lawyer with experience and fluency in German and English.

Optimize product availability for a closed customer pool by managing preventive maintenance, repairs, and engine configuration standardization. Improve product reliability based on customer requirements and anticipate standardization campaigns.

Material Handling Assistant needed for a major industrial project. Responsibilities include controlling material flow, inventory control, and logistics coordination. Requires experience in material handling or logistics and strong organizational skills.

Senior Backend Engineer for AdTech. Design and maintain scalable backend services for advertising products like ad serving and campaign management. Experience with Node.js, TypeScript, and cloud-native applications is required.

Senior Chemist R&D develops specialty chemicals for OLED and OPV. Responsibilities include designing molecules, executing syntheses, mentoring junior chemists, and supporting process development. Requires a PhD in synthetic organic or organometallic chemistry and leadership experience.

Lead and develop a team of 3–4 in After Sales Commercial Operations. Oversee LOA governance, drive strategy deployment, and manage global KPIs. Requires 7+ years in Commercial Operations with strong strategic and stakeholder management skills.

Senior Java Software Developer to develop secure software for the digital justice system. Requires 5+ years in Java, expertise in Spring/Hibernate, and knowledge of cloud/container technologies.

PhD Student in Cellular & Molecular Immunology at UMG. Research focuses on MiT transcription factors in immune responses and autoimmune diseases like MS, using EAE models. Tasks include sample analysis, flow cytometry, and genetic studies.

Chief Product Officer to own the product lever driving company vision and trajectory. Requires strong, data-driven product leadership, a customer-first mindset, and comfort with iterative development in a SaaS scale-up.

Working Student in Product and Portfolio Management supports the end-to-end food supplement product lifecycle. Responsibilities include managing EU product listings, conducting market research, and monitoring SKU performance. Requires enrollment in a relevant field and fluency in English and German.

As our first dedicated employee in Germany, you will manage existing opportunities, accelerate local growth, and strengthen the logistics and technical support network. You will focus on contaminated site remediation and drinking water utilities, building relationships with consultants, key accounts, and partners.

Branch Manager – Ocean Freight oversees fiscal performance, operational leadership, and strategic direction for the ocean freight branch. This role drives revenue growth, manages P&L, and ensures compliance with international shipping regulations.