freelance English-speaking jobs in Bielefeld

Energy Solutions Expert / Senior Sales Engineer needed to connect customer needs with a SaaS platform. Requires 3-5 years in renewable energy commercial asset management or pre-sales/solutions engineering. Must understand asset management challenges.

Finance and Accounting Manager for an investment platform. This role manages daily accounting, prepares financial statements, oversees AP/AR, and ensures compliance with HGB and IFRS. Requires 5+ years of experience and fluency in German and English.

Develop and optimize medium-voltage cable accessories up to 42 kV. This role involves design, testing, and collaboration with partners, requiring an Electrical Engineering degree and knowledge of plastic injection molding.

Senior AI Engineer designs and implements production-ready AI solutions, building scalable LLM, RAG, and agent architectures. Requires 5+ years of ML/DL experience, proficiency in Python, and cloud deployment skills.

Technical Delegate executes on-site and remote missions to resolve complex vehicle technical incidents and accelerate repair lead times. This role diagnoses electrical/electronic faults using OEM tools and supports service networks.

Experienced Construction Worker/Assistant needed to support M&E installation on a high-spec semiconductor project. Duties include assisting trades, material handling, maintaining cleanroom standards, and adhering to safety protocols.

Support AI tool deployment, build prototypes, and design AI-supported workflows for case teams. Requires full-time study in CS/Data Science, programming knowledge (Python), and fluency in English and German.

Working Student Supply Chain supports data management by generating KPI reports and assisting with process mapping. Responsibilities include supporting automation using Excel macros or Power BI. Candidates need enrollment in a relevant degree and proficiency in MS Office.

Mechatronics Development Engineer focused on process development, integration, and qualification of mechatronic modules. Responsibilities include algorithm development in Matlab and system testing.

Build Etteplan's defense business in Germany from the ground up as Director Defense Germany. Define and execute the growth strategy, lead business development, and manage the defense P&L for Etteplan Defense GmbH.

Medical Expert – Clinical Science responsible for clinical-scientific and regulatory activities across the product lifecycle. Key duties include preparing regulatory documentation, interpreting scientific data, and advising on benefit-risk assessments. Requires a Medical Doctor and relevant industry experience.

R&D Senior Engineer (f/m/d) acts as the agile team's "what" and "why" expert, owning and prioritizing the product backlog. Requires 5+ years in Software Engineering, knowledge of industrial protocols, and proficiency in Azure DevOps.

Develop Anaplan models for EMEA Finance and Sales, handling customization, maintenance, and support. Ensure model efficiency and user-friendliness while advising on Anaplan utilization.

Provide customer-facing technical service for XSYS equipment across EMEA. Responsibilities include installation, maintenance, troubleshooting, and providing technical support on-site. Requires strong analytical skills and customer orientation.

Technical Assistant needed for Molecular Plant Immunity research. Tasks include molecular biology, microbiology, plant husbandry, and documenting results. Requires training as a Biological technical assistant.

Reliable couriers needed for a leading food delivery platform. Deliver food and drinks using a bicycle. Must be 18+, confident in city traffic, and have good communication skills in English or German.

Account Executive to scale the Mid-Market segment across DACH for an AI Coaching startup. Own the full commercial journey, from outbound prospecting to closing deals with senior buyers. Requires 3+ years of B2B SaaS sales experience and business-fluent German.

PhD Student to develop and optimize human lymphoid organ culture models to investigate HIV-1 pathogenesis and adaptive immune responses using tissue engineering and microfluidics. Focus includes studying viral persistence and Nef's impact on host immunity.

This role provides application advice and technical R&D support for Sensient's pharmaceutical products. Responsibilities include developing technical solutions and improving customer loyalty through training. Requires R&D experience in pharma or food ingredients.

Technical Specialist for ALD Coating System supports ALD equipment operation, maintenance, and servicing. Responsibilities include setup, routine checks, troubleshooting, and process data recording. Technical training and practical equipment experience are required.