freelance English-speaking jobs in Bielefeld

Design and develop high-end C++ components for medical desktop applications, focusing on performance, stability, and scalability. Architect, implement, and review complex multithreading and parallelization concepts. Analyze, refactor, and optimize existing codebases, identify bottlenecks, and raise product performance and quality.

Manage Meta Ads and Google Ads campaigns to attract prospective students. Plan, optimize, and test performance creatives. Requires hands-on paid campaign experience, strong copywriting, and B2 German/C1 English.

Senior Business Partner to oversee and improve Risk Management and Internal Control Systems. Develop risk processes, lead assessments, and advise stakeholders on compliance and best practices. Requires experience in risk management and internal control.

Mechanical Test Engineer (w/m/d) Applicators is sought for the Brachytherapy division. This role involves conducting and documenting mechanical testing of medical products and serves as a central point for various departments.

Director Compliance will define and drive the Group-wide Compliance strategy for the international fashion company. This role involves leading compliance programs, managing risk assessments, and fostering an ethics culture. Fluent German and English are required.

Regional Sales Director for DACH, an individual contributor role owning enterprise accounts. Develop strategic plans, generate pipeline, and build opportunities by engaging CISOs and CIO's. Requires fluency in German and English.

Lead end-to-end inventory and supply planning, optimizing working capital and reducing excess stock. Manage purchasing teams, drive process automation, and use data to ensure high product availability. Requires experience in supply planning and proficiency in German and English.

Staff Software Engineer owns technical direction for Revenue Management systems, focusing on architecture, data flows, and agentic tooling. Requires experience with production backend systems, distributed systems, and applied AI.

AI Safety Specialist role involves red teaming conversational AI models via jailbreaks and prompt injections. Responsibilities include annotating failures, classifying vulnerabilities, and documenting risks. Must be fluent in English and Dutch with prior red teaming experience.

Secondary school seeks a Mathematics Teacher for full or part-time roles. Responsibilities include designing IB curriculum lessons, preparing students for IB exams, and integrating digital media. Requires a relevant degree and teaching certification.

Senior, hands-on Growth Marketing Manager to own paid channel strategy. Build a full-funnel media plan, execute paid search/social, and connect media activity to revenue. Requires B2B paid media experience and fluency in CRM-linked measurement.

Co-own the Data area of a media-planning platform, managing APIs from platforms like Meta and Google Ads. Model and normalize data using dbt and SQL, ensuring data quality and pipeline reliability. Requires strong Python and SQL skills.

Own the product strategy for financial crime and fraud detection at Shine. Develop AML and fraud products across multiple European markets, translating complex regulations into actionable features for analysts.

Voi seeks a Driver to operate in a leading shared micromobility operator in Europe. This role supports Voi's mission to provide safe, sustainable, and reliable micromobility across various cities.

IT Project Lead for an AI transformation project. Lead planning and delivery of IT implementation projects, coordinating technical teams and stakeholders. Requires 5+ years of experience and strong project management skills.

Field Development Manager to grow restaurant count via profitable development. Attract and secure new franchisees across Germany through lead generation and site identification. Requires sales, negotiation, and real estate knowledge.

Business Development Manager drives German market expansion by building partnerships with local brands and sellers. This role requires 10+ years of experience, strong data analysis, and fluency in German and English.

Lead/Senior Sales Engineer for Industrial AI. Partner with Sales on strategic enterprise opportunities, leading technical discovery, tailored demos, and executive conversations. Requires 3+ years in Sales/Solutions Engineering with a STEM background.

Support digital transformation by ensuring sales master data is consistent and reliable. You will implement data governance standards, cleanse data, improve processes, and act as a business-IT interface.

Manage and optimize paid B2B campaigns across Google and LinkedIn Ads for multiple clients. Requires 1-2 years of experience, budget ownership, and proven ability to drive results independently. Fluent German is required.