freelance English-speaking jobs in Bielefeld

Project Manager responsible for communication, task management, data management, and stakeholder coordination within project environments. Experience in construction, refurbishment, or technical project management required. Strong digitalization skills and knowledge of MS Teams and SharePoint are essential.

Principal Security Consultant for the defense sector. Develops, reviews, and audits IT/OT security concepts aligned with IT-Grundschutz and ISO/IEC 27001. Translates regulatory requirements into implementable security controls for OT, embedded, and mobile systems.

Sales Executive will own a mid-market territory and grow ARR by co-selling with strategic partners to help merchants, brands, and 3PLs modernize delivery management. Responsibilities include building and executing joint business plans with partners, driving partner-sourced pipeline, and owning full-cycle sales.

Solution Architect for SAP S/4HANA Source-to-Pay systems. Designs, maintains, and validates technical SAP solutions. Translates functional designs into technical specifications and collaborates with stakeholders to prioritize business demands. Requires 10+ years of IT experience, 8+ years in solution architecture, and 5+ years in global projects. Must have S/4HANA Source-to-Pay certification and experience with SAP ABAP and ALE-IDOC.

Senior Design Manager to lead design delivery of data center projects in EMEA. Experience in mission-critical design, M&E industries, and strong leadership within multi-disciplinary teams required.

Software Developer C++ will design and implement software solutions for medical robotic systems. Responsibilities include defining software requirements, coding, debugging, testing, and ensuring product reliability and safety. Requires a Master's or PhD in a related field and 3-5 years of experience in software design and development, preferably in medical device or robotics industries. Strong proficiency in C++ 17/20 and experience developing real-time applications in a Linux environment are essential.

Global Corporate Account Manager will sell Ecolab's value proposition, meet sales objectives, and lead customer negotiations. Requires 10+ years of B2B sales experience, a business degree, and fluency in English.

ISCC is seeking a Software Engineer – Full Stack to design, develop, and maintain full-stack applications, web services, and REST APIs. Responsibilities include implementing and integrating applications with external systems, automating workflows, and creating technical documentation. The ideal candidate will have a university degree in computer science or a related field, at least 2 years of experience as a full-stack software engineer, and strong proficiency in Go, JavaScript/TypeScript, and Python.

Inside Sales Representative (m/f/d) Swedish Market supports existing business customers in the Swedish logistics market. Daily work involves regular contact with assigned accounts, maintaining customer relationships, and identifying additional needs. The role is office-based in Berlin and requires Swedish (native level) and English (professional working level).

Research assistant to analyze and evaluate III-V semiconductor structures grown by MOCVD, focusing on resonant tunneling diodes. Responsibilities include electrical characterization using a 4-tip scanning tunneling microscope and materials science analysis of nanowire morphology.

Develop and deliver features for a decarbonization platform, collaborating with product managers and contributing to platform architecture.

Develop new functionalities and own your code as a PHP Software Engineer. Collaborate with Product Managers and other Engineers to deliver reliable, scalable solutions for customer acquisition, underwriting processes, and APIs.

Leads and optimizes performance-driven campaigns across TV, OOH, Radio, and digital channels for Autohero and Wirkaufendeinauto.de. Develops and implements measurement strategies, analyzes campaign performance, and manages budgets. Builds business cases, negotiates pricing, and collaborates with creative teams.

Senior Software Engineer to build the next generation of AI-native data tooling on top of an open-source Python data ingestion core. Design, implement, and maintain features, contribute to architecture, and mentor teammates. 7+ years of software development and/or data engineering experience required. Strong Python skills, data engineering fundamentals, and SQL knowledge are essential. Based in Berlin and open to working onsite regularly.

Shape the HR IT and internal communication landscape in a newly conceived IT department. Define and manage the IT portfolio and strategy for HR and Communications applications, ensuring seamless integration with corporate objectives.

Data Analyst (m/w/d) needed for full-time position. Collect, clean, and validate data from various sources. Perform exploratory data analysis, create dashboards and reports, and develop KPIs. Collaborate with business units to understand requirements and provide data-driven solutions.

Design intuitive HMI interfaces for in-vehicle displays. Collaborate with cross-functional teams to deliver production-ready designs using Figma and other industry-leading tools. Contribute to design systems and explore emerging technologies in UI/UX, automotive tech, and AI-enhanced design workflows.

Data Engineer needed to design, build, and maintain data pipelines for energy-related data, including ESS, Solar PV, and Electricity Prices. Collaborate with data scientists and researchers to operationalize machine learning models at scale. Apply AI/ML techniques to ESS applications, including SoX estimation, Energy Trading, and predictive analytics.

Drive revenue growth by prospecting, acquiring, and managing advertising clients across digital platforms. Lead the full sales cycle, from identifying prospects to onboarding new accounts.

Internship focused on data exploration, advanced analytics, and visualization of battery performance, safety, and lifetime metrics. Collaborate with researchers and engineers on projects related to battery systems.