freelance English-speaking jobs in Bielefeld

The Martian Mindset Cluster of Excellence invites applications for two independent postdoctoral research positions. Successful candidates will lead independent research projects with full scientific and budgetary autonomy. Applicants must have a PhD (or proof of imminent completion) in any field relevant to The Martian Mindset and a convincing 3-year research program.

Develop and optimize digital customer journeys, focusing on top-funnel performance and new customer acquisition. Analyze user behavior, conduct A/B and multivariate testing, and translate data into actionable improvements. Manage and optimize campaigns across various platforms, including Meta, LinkedIn, and Google Networks. Collaborate with cross-functional teams to create cross-channel optimization initiatives.

Working Student - Innovation Management supports Public Value Hub's programs in Munich, builds relationships with the ecosystem, and acts as a liaison between the Leipzig headquarters and the Munich Urban Colab.

CQV Engineer to lead commissioning, qualification, and validation initiatives for biotech production lines. Develop and execute validation protocols, troubleshoot equipment, and ensure cGMP compliance.

Senior Associate to support transactions from review to execution, including financial analysis, valuation, and due diligence. Prepare investment materials and work with portfolio companies on growth initiatives and value creation. Requires several years of experience in private equity, investment banking, or related fields.

Support strategic, creative, and operational planning and execution of national and international sales campaigns. Collaborate with internal stakeholders and design teams. Contribute to development of new sales strategies and concepts.

Network Planning Specialist supports the development and optimization of the last-mile delivery network in the Frankfurt region. Collaborates with DSPs, franchise partners, and operations teams to ensure scalable structures and operational excellence. Analyzes data, identifies operational gaps, and implements improvement measures. Requires experience in logistics, e-commerce, or parcel delivery, strong analytical skills, and fluency in German and English.

Frankfurt International School seeks an organized and technologically proficient Administrative Assistant for Grades 6-8. The role supports the Upper School office, manages substitute teacher coverage, and assists with scheduling and events. Applicants must be proficient in English and German.

Translates business strategy into IT demand and project roadmaps. Acts as primary IT contact for business leaders, capturing requirements and driving project execution. Analyzes processes and KPIs to identify improvement measures.

Senior Fullstack Engineer to build and extend an AI platform that automates security reviews. Responsibilities include backend development, data flow design, consultant-facing UI development, and platform reliability. Must have 5+ years of fullstack experience with production ownership of complex software, Python and FastAPI, PostgreSQL, async programming, React and TypeScript, and production deployment experience.

Define and implement top-level ASIC test concepts based on analog and digital test concepts. Develop ATE test concepts and programs for series production. Validate test functionalities and ensure alignment of test results. Characterize silicon across PVT and support production quality.

Treasury Manager responsible for liquidity, cash flow, and financial risk management. Contributes to financing and investment decisions, advises stakeholders, and drives process improvements. Requires a Master's degree in Finance or a related field and strong experience in treasury operations.

Ensure data consistency, automation, and reliability across performance tracking. Develop, maintain, and improve Power BI dashboards and reporting solutions. Translate data into actionable insights to improve service levels and operational efficiency. Track, analyze, and communicate Route-to-Market KPIs. Collaborate with stakeholders on KPI performance and action plans. Provide analytical support for Route-to-Market optimization.

As Trade & Customs Specialist, you will shape standards, manage customs authorizations, and oversee key compliance processes to ensure audit readiness. You will monitor bonded warehouse activities, fulfill AEO-C obligations, and act as a point of contact for customs authorities.

Provides customer service, processes sales orders, tracks order status, and investigates issues. Collaborates with internal teams to ensure timely and accurate order fulfillment. Requires proficiency in English and German, SAP B1 knowledge, and 2+ years of customer success experience.

Warehouse Manager / Warehouse Lead Germany (m/f/d) needed for a hands-on role in Pulheim. The successful candidate will coordinate the warehouse team, manage goods receipt, storage, picking, packing, dispatch, and stock checks. Experience in warehouse operations, team leadership, and systems like PDA scanners and UPS WorldShip is required. Fluency in English and German is essential.

HR & CSR Intern supporting HR management, onboarding, training, and CSR initiatives. Process support for HR projects and employer branding. Must be a matriculated student in Psychology or Human Resources Management with strong English skills.

Freelance/contracting AI Motion Designer needed for a project in Berlin. Create motion content using Adobe Creative Suite and AI video tools like Gemini/Veo. Must have a portfolio showcasing AI-driven video work and strong collaboration skills.

Project Manager to coordinate and manage digital projects across public and education sectors. Requires fluent German, 3+ years project management experience, strong stakeholder communication, and technical understanding.

Support global rollout of mindfulness programs and engagement of mindfulness communities at SAP. Tasks include program management, training coordination, administration, reporting, and communication.