freelance English-speaking jobs in Leiria District

Native Mobile Audio Developer to design, develop, and optimize audio systems for iOS and/or Android platforms. Experience with native audio APIs and real-time audio thread management required.

Creative Designer / Creative Manager will optimize Amazon listings and create new visuals for A/B testing. Responsibilities include designing Amazon listing images, infographics, and A+ Content. Must have advanced Photoshop skills and experience designing e-commerce visuals.

The Employee Service Success Specialist helps customers achieve value from Zendesk's Employee Service solutions. This role focuses on driving adoption, optimizing workflows, and enabling customers to deliver world-class internal service experiences. The Specialist partners with Core CSMs, Professional Services, GTM/Sales, Product, and CX Enablement to reduce customer risk, accelerate adoption, and strengthen long-term value realization.

Experienced Software Developer to design, develop, and improve modern applications using C#, ASP.NET, .NET Core, AWS or Azure, and microservices architecture.

Payments and Banking Specialist will ensure accurate and timely posting of bank transactions, perform reconciliations, and prepare payment runs. Experience in ERP accounting systems (SAP) and proficiency in Excel are required.

QA Automation Engineer to develop, maintain, and debug automated UI and API tests in Java/Groovy for Salesforce UI and middleware integrations.

Lead the strategy, architecture, and development of a client's ServiceNow platform. Manage a team focused on platform optimization and enhancement. Translate business requirements into effective ServiceNow solutions.

Moderate online content in Italian, ensuring a safe and positive user experience. Review and remove content violating platform standards while collaborating with a global team.

The Property Management Executive oversees a portfolio of high-end rental properties, ensuring operational excellence and owner satisfaction. This role involves property maintenance, inventory management, contractor oversight, and reporting.

The Clinical Research Associate monitors clinical trials on-site and remotely, ensuring subject safety, data integrity, and protocol adherence. Responsibilities include reviewing CRFs, verifying informed consent, and reporting monitoring visit findings.

Senior Security Operations Engineer to join a dynamic Security Operations Centre (SOC). Responsibilities include investigating security alerts, conducting incident response, and proactively hunting for threats. Requires experience in security operations, incident response, and security frameworks.

Investment trainee to join the Investment/Portfolio Management team. Gain hands-on experience in investment and portfolio management within an international environment.

We are seeking former professional footballers with UEFA coaching qualifications to fill various coaching roles across European and Middle Eastern clubs.

Hill International seeks a senior BIM Manager to lead information management strategy across the project lifecycle for major building and infrastructure developments in Lisbon. The BIM Manager will lead Designer BIM deliverable review, federated model coordination, CDE governance, and the BIM Execution Plan.

Develop, test, and maintain backend services using Java/Kotlin and Spring Boot. Design and implement scalable, event-driven architectures and build RESTful APIs. Collaborate with cross-functional teams to deliver new features and system enhancements.

Regional Medical Advisor role focused on combating, preventing, and eradicating HIV and AIDS.

Senior Frontend Developer will build the web experience for a health infrastructure platform using React, TypeScript, and AI coding tools. Responsibilities include translating designs into components, building a component library, and collaborating with product, design, and backend teams.

Senior Mapping & Localization Engineer will design and implement SLAM pipelines, improve localization robustness, and develop workflows for map alignment and merging. Requires a BS/MS in a related field and 5+ years of experience in robotics, mapping, computer vision, or geospatial systems. Strong skills in SLAM, localization, sensor fusion, geometric optimization, and 3D reconstruction are needed. Experience with GTSAM, Ceres Solver, PCL, OpenCV, ROS, and PROJ is preferred.

Provide customer support for ByteDance e-commerce products and services via email, chat, and phone. Handle inquiries professionally, ensuring excellent customer experience.

Senior Commissioning & Control Systems Engineer will design, integrate, and commission PLC-based control systems for electromechanical environments. Responsibilities include developing control logic, defining system integration requirements, producing documentation, and executing system testing and commissioning. Requires a degree in Systems Engineering or related field, 5+ years' experience in control systems/PLC engineering, and strong expertise in system integration and electromechanical automation.