java English-speaking jobs in Mainz

Controller for European Logistics & Supply Chain Finance. Responsibilities include cost controlling, budgeting, and management reporting. Requires a relevant degree, analytical skills, and proficiency in German and English.

Service Technician provides on-site support for the operation and maintenance of industrial fluid systems at a customer's manufacturing facility in Offenbach am Main, Germany. Responsibilities include ensuring optimal fluid condition, communicating with internal and external stakeholders, and maintaining accurate data. Requires technical training or equivalent experience, fluency in German and English, and strong customer focus.

Senior Project Development Lead will manage large-scale battery energy storage projects through development, focusing on grid connection, permitting, and stakeholder engagement.

Product Engineer needed to build a collaborative scheduling platform. Own the end-to-end feature process using TypeScript across FE (Vue) and BE (NestJS/AWS). Requires 3-5 years of full-stack experience.

Controlling & Operations Manager for a mid-market private equity fund. This role supports the CFO across finance, legal, tax, and fund administration, including compliance and reporting. Requires PE/investment management experience and fluency in German and English.

Finance Manager for a Private Equity-backed software company. Responsibilities include financial reporting, tax compliance, and business partnering across three countries. Requires 7+ years of experience and German GAAP knowledge.

Experienced Healthcare Project Manager needed for challenging architectural projects. Responsibilities include leading teams, managing contracts, and ensuring compliance with cost and quality targets. Requires an Architecture degree and extensive planning/execution experience.

Senior Lead Wholesale Negotiations & MVNO Partnerships will shape the European mobile communications model by leading strategic MNO wholesale negotiations and structuring capacity services. Requires a relevant degree and proven negotiation experience in the telco environment.

Amazon Warehouse Team Member role involves unloading, lifting, and transporting products, as well as scanning and sorting packages. Candidates must be 18+, comfortable standing/walking, and proficient in German and/or English.

Establish end-to-end Smart Cockpit requirements engineering and digital collaboration connecting EU market needs with CN HQ R&D. Design a centralized platform for structured communication, issue tracking, and knowledge reuse.

Technical Management Engineer provides Level 2 service support, assists L1 teams with escalations, and supports L1 training. Responsibilities include technical support, training, and managing regional issues. Requires a technical background and 3+ years in technical support.

Lead complex, multi-stream global programs for clients, driving digital transformation. Responsibilities include end-to-end delivery, stakeholder management, and risk mitigation. Requires 8+ years in IT program management and fluent German.

Senior Lead Wholesale Negotiations & MVNO Partnerships will shape the European mobile communications model by leading strategic MNO wholesale negotiations and structuring capacity services. Requires a relevant degree and proven negotiation experience in the telco environment.

Senior Backend Engineer to design and own core services for a large-scale, event-driven platform. Requires 7-10 years in Node.js/TypeScript, strong system design, and experience with AI coding agents.

Manager in Strategy (Operational Deal Advisory) to assess strategic plans and implement M&A deals like carve outs and integrations. Lead projects, manage employees, and engage with top management for corporate and private equity clients.

Perform lab activities including organic synthesis and chemical analysis to support new silicone product development. Requires vocational training as a CTA or comparable qualification, 1-3 years of lab experience, and fluency in English and German.

Supports new business development and advisory engagements in the Technology sector. Evaluates financial statements, industry trends, and M&A activity. Manages and mentors analysts and associates. Requires VP level experience in advisory/Corporate Finance with a track record of M&A executions.

Manager, Procurement Consulting leads international projects optimizing purchasing strategies, reducing costs, and managing supplier relationships. Requires strong procurement consulting experience, project management, and fluency in German and English.

Experienced Service Engineer needed for an international technology company specializing in process analytics. Responsibilities include technical support and maintenance of measurement and gas-analysis systems in Bavaria. Requires technical training and strong German skills.

Quantum Software Engineer to develop GWDG’s QC ecosystem, focusing on quantum anomaly detection. Responsibilities include implementing containerized infrastructure and CI/CD pipelines. Requires CS/Physics degree and coding experience.