java English-speaking jobs in Mainz

Payroll Specialist/Expert ensures payroll production, control, and compliance for Germany and CEE. This regional expert role focuses on compliance, provider management, and international mobility within a fast-growing group.

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.

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.

Physics PhD to develop problems in Statistical Mechanics, Condensed Matter, AMO Physics, and contribute to a project involving large language models.

Senior Auditor (m/f/d) supports the Internal Audit unit in enhancing and protecting the organization's value by providing independent and objective audit services. Conducts risk-based audits at group companies globally, analyzes business processes, identifies risks, and develops audit programs. Documents work steps, prepares audit results, and communicates them to senior management.

Lead AI Solutions Engineer/Architect to build production-grade AI solutions for a global manufacturing client. Responsibilities include designing GenAI/Agentic AI applications on Azure and Databricks, and triaging business use cases. Requires expertise in ML, LLMs, and cloud platforms.

This company-building COO role operationalizes a fast-growing business into a scalable organization. You will build structures, processes, and teams to drive execution across customer success, commercial operations, and product alignment.

Senior Process Architect for Electronic Testing & System Integration. Responsible for the overarching test strategy for electronic assemblies and mechatronic systems across the value chain, driving test method and architecture development.

Experienced HV/LV Senior Authorised Persons are needed for a major Data Centre construction project in Europe. Responsibilities include ensuring safe operation, managing permit-to-work, and carrying out safe isolations. Proven HV/LV SAP experience is required.

Dynamic Area Sales Manager needed to drive growth across Europe and develop Latin America. Responsible for B2B sales strategy, managing key accounts, and promoting technology solutions in banking, ID, and payment card markets.

As an Investment Valuation Manager / Associate, you will provide valuation expertise for renewable energy assets across their lifecycle, supporting investment decisions and collaborating with stakeholders. You will refine valuation methodologies, financial models, and best practices, ensuring data-driven insights.

Lead the scientific strategy for Search across a major fashion platform. Define the vision for relevance using ML and AI, leading teams to develop query understanding, retrieval, and ranking models.

MindFriend seeks Strategic & Clinical Advisory Board Members to support growth and ethical integrity. Candidates should qualify under Executive & Governance or Clinical & Psychiatric tracks. The role involves annual advisory meetings and occasional event representation.

HiBob seeks a Senior Partnerships Manager to build and scale its partner ecosystem across the Nordics. This role involves developing and executing partner strategy, recruitment, and revenue generation in a key growth market.

Data Analyst to provide analytical insights supporting data-driven decisions across technical divisions. Analyze complex production data against KPIs, identify root causes, and correlate global supply chain data. Requires a quantitative degree and statistical analysis skills.

Lead and mentor Enterprise Architects to define client data and cloud strategy. This role requires 20+ years of experience, strong technical skills in AI and data architecture, and executive presentation ability.

As Business Controller for IT and R&D, you will partner with leadership teams to drive performance and strategic decision-making. You will own budgeting, forecasting, and long-term planning, while also developing and implementing business improvement initiatives.

Senior Java Software Developer develops secure solutions for legal communication and public administration digitalization. Requires 5+ years of Java experience, expertise in Spring/Hibernate, and knowledge of cloud platforms and IT security.

This role owns and evolves global merit and short-term incentive processes. The manager shapes reward mechanisms, conducts analysis, and ensures consistent application of global reward designs across countries.

Support the CEO of an AI sound wellness company. Responsibilities include managing German bureaucracy, handling business/personal logistics, and conducting structured research. Requires 3+ years of experience and fluency in English and German.