freelance English-speaking jobs in Castelo Branco

AI/ML Engineer will design and ship conversational pipelines for AI-powered 3D avatars. Responsibilities include building fact-checking layers, integrating voice stacks, and collaborating with university partners on 3D rendering. Must have 3+ years of applied AI/ML experience, Python proficiency, and experience integrating LLMs into products.

Senior AI Engineer to build and integrate AI solutions into enterprise applications. Requires 6+ years of backend development experience with Java and Python, experience with LLMs, RAG, AI Agents, and cloud-native development.

Senior Full Stack Software Engineer will build scalable solutions using .NET, own the SDLC, and craft user interfaces with React. Requires 5+ years of experience with C#, .NET Core, SQL Server, JavaScript, and testing practices.

Develop and optimize electrotechnical components for industrial production. Design, test, and validate electrotechnical systems while ensuring quality and safety standards.

Product Owner to define and deliver client- and partner-facing digital products. Translate legal and operational needs into intuitive user experiences and collaborate with cross-functional teams to launch scalable solutions.

Optimization Scientist will model healthcare operational problems using Mixed-Integer Programming (MIP). You will translate academic research into practical solutions, formulate MIP models for scheduling, staffing, and resource allocation, and design objectives to improve efficiency.

Account Manager to drive sustainable business growth in targeted operating room accounts. Develop and execute account plans, secure sales opportunities, and act as a clinical consultant for customers. Requires 5+ years of commercial experience in the Medical Devices sector and experience as an OR instrument nurse (preferred).

Full-Stack Web Developer will enhance the headless frontend of Aftermarket Enterprise Platform, collaborating with teams to deliver B2B Ecommerce functionality. Requires 7+ years of experience, proficiency in Vue.js, BEM, and Agile methodologies, and fluency in English.

Designs and governs global Payroll and Time & Attendance processes, ensuring consistency and compliance across regions. Owns and evolves end-to-end processes, defining standards, documentation, and control frameworks. Acts as primary process owner interface for the BPO partner, ensuring adherence to SLAs and compliance requirements.

Application & Systems Integration Engineer will develop flexible thin film solar cells, conduct mechanical testing, and integrate solar cells into power systems.

Senior Epidemiological Programmer will lead development of datasets and conduct longitudinal analyses for observational studies in virology. Requires experience with EMR and claims data, statistical programming (SAS/R), epidemiological study design, and managing multiple studies.

Senior Consultant to develop business strategies and organizational plans for clients. Requires 3+ years of experience in strategy and operations consulting, strong analytical skills, and fluency in Portuguese and English.

Senior Product Manager will lead the development and scale of the Remote Build product, focusing on AI-enabled connectors, custom applications, and managed services. Responsibilities include owning demand signals and unit economics, managing standard and custom integrations, and developing managed services. Requires fluency in AI/agents, proficiency in Cursor and/or Claude Code, and senior-level product management experience on platform, API, or developer-facing products.

Back-end Developer with experience in Camunda or equivalent BPM technologies needed. Develop and maintain back-end services, implement business logic and workflows, and integrate with databases and core systems. Collaborate with teams to ensure quality, performance, and scalability of solutions.

Lead Flutter Mobile Engineer to design, architect, and deliver high-quality mobile applications. Manage and mentor a team of developers, provide technical leadership, and collaborate with stakeholders.

Lead Generation SDR will build and manage outbound lead generation across Europe for a European manufacturer specializing in hospitality and residential furniture. Responsibilities include identifying decision-makers, qualifying leads, and generating qualified opportunities.

Architect and evolve enterprise-scale data platforms, defining standards for data integration, storage, processing, and governance across cloud environments. Lead the design and implementation of data governance frameworks, embedding quality, lineage, and classification by design.

Software Engineer with +5 years of .NET development experience (C#, .NET Core, ASP.NET, Entity Framework) and experience with AWS/Azure, microservices, and containerization tools (Docker, Kubernetes). Proficiency in English (B2 level) required. Hybrid work model (3 days/week in Porto) and occasional business trips. Must be based in Portugal with Portuguese or EU citizenship or a valid Portuguese work permit.

Experienced HR professional to oversee day-to-day HR operations across multiple European countries. Responsibilities include service delivery, compliance, escalation management, and process improvement. Requires 7+ years of HR experience, strong leadership skills, and knowledge of regional employment laws. Fluency in English and additional regional languages preferred.

Provide customer support in French for an international team. Handle inquiries, resolve complaints, and collaborate with internal teams.