java English-speaking jobs in Mainz

Facilities Manager to lead workplace operations at the Frankfurt office. This role oversees facilities, workplace services, vendors, and the local team, ensuring a safe and efficient environment. Requires 5+ years of leadership experience and fluency in German and English.

Experienced Project Manager needed for utility-scale renewable energy construction in Germany. Oversee solar PV and BESS implementation, managing schedule, budget, and contractors. Requires 5+ years' experience and fluent German.

Director Sales (EMEA) drives growth by developing account strategies and building executive relationships. This role requires significant experience in semiconductor sales, business development, and securing complex customer engagements.

Principal AI/ML Engineer to own end-to-end architecture for battery insights algorithms. This role bridges algorithm development with production software for embedded systems, requiring expertise in AI/ML, signal processing, and system design.

Lead authentic, story-driven tours in Cologne, focusing on the city's history, culture, and traditions. This part-time role requires a good understanding of local history and the ability to engage international visitors.

Senior Project Manager for Development Monitoring & Technical Due Diligence in Real Estate Consultancy. Deliver TDD and monitoring services for diverse projects, advising banks, investors, and developers. Requires technical expertise and client-facing skills.

Senior Associate in Private Equity focusing on Carve-out & Merger Integration. Manage complex separations and integrations to drive operational performance and value creation in PE-backed businesses. Requires Master's degree and extensive experience in carve-out services.

Manage end-to-end BESS projects across Europe, overseeing lifecycle stages from FAT to grid connection. Requires 3–5 years of project management experience, strong coordination skills, and fluency in English and German.

Experienced HR leader needed to drive strategic HR priorities, strengthen people processes, and support organizational growth. Lead a small HR team, advise senior leadership, and manage complex stakeholder situations.

Director of Sales - DACH to drive sales strategy and revenue growth for a B2B AI supply chain platform. Own DACH P&L, lead the sales team, and execute commercial strategy in the DACH market. Requires 7+ years of B2B sales experience and fluency in German and English.

Warehouse Workers needed. Duties include unloading, lifting, scanning, and sorting products. Must be 18+, able to stand/walk for long periods, and speak basic German or English.

Backend Platform Engineer to build and maintain a new rehabilitation aftercare platform. Focus on Rust development, API design, and production debugging. Requires 3+ years of backend engineering and Rust experience. Team operates in English.

Lead global commercial sales strategy and execution for all product lines, including Diagnostics and SMS. Accountable for revenue growth, market share expansion, and building a high-performing global sales organization.

Director of Product to own vision, strategy, and execution for an integrated B2B energy platform. Lead a team of 6 PMs/Designers, driving product across Supply, Manage, and Flex. Fluent German is required.

Experienced Site Security Manager needed to lead security teams, oversee daily operations, and ensure compliance with security procedures in a datacenter environment.

Station Agent provides outstanding passenger services and ensures seamless airport operations. Responsibilities include coordinating crew, handling agents, and managing flight documentation. Requires a degree or high school graduation, 1+ year in aviation/tourism, and English proficiency.

Experienced Senior Controller needed to support financial management and performance of manufacturing operations. Responsibilities include financial control, accurate reporting, cost control, budgeting, and business partnering. Requires finance/accounting degree and experience in controlling.

Lead Data Software Engineer with Databricks expertise to drive technical design for end-to-end traceability solutions. Requires 5+ years in data/platform roles, expertise in Databricks, Spark, and cloud platforms.

Enterprise Architect supporting USAFRICOM requires 8+ years in IT, with 5+ in senior architecture. Must have Secret clearance and experience with Cameo Systems Modeler. Focus includes strategic planning and IT service roadmap development.

Join a specialist contractor delivering power infrastructure for data centres. Support commercial management, subcontract administration, cost reporting, and risk monitoring on major projects. Experience as a QS is preferred.