freelance English-speaking jobs in Leiria District

Drive innovation in post-training methodologies for agentic behaviors and tool use in AI models. Refine pre-trained models to enable reasoning, planning, and autonomous tool invocation for real-world applications.

Senior Analyst/Analyst will own end-to-end portfolio accounting and reconciliation operations for complex client funds. Responsibilities include daily reconciliations, P&L analysis, GAV/NAV finalization, and client communication. Requires an MBA/MS (Finance), CFA, or equivalent, 2-6 years of fund accounting experience, and proficiency in MS Excel.

Content Moderator needed for a major global social media platform. Review, analyze, and moderate video content, ensuring compliance with community guidelines. Native or C2-level fluency in Italian and a solid working command of English required.

Design, build, and scale intelligent AI-powered solutions using machine learning and generative AI technologies. Develop robust AI application architectures and contribute to innovation.

Senior Lead Cost Manager to join the Data Centre team in Lisbon. Responsibilities include cost management liaison, pre and post-contract duties, feasibility studies, tendering, cost planning, and reporting. Requires a degree in Quantity Surveying, Engineering, Construction Management, or related field, plus 7+ years of experience leading cost management on medium to large Data Centre projects. Solid exposure to MEP and CSA packages is required. Proficiency in Portuguese and English is essential.

Speechify seeks a Software Engineer to build and maintain data ingestion pipelines for AI model training. Responsibilities include data sourcing, infrastructure management, and collaboration with scientists to optimize data quality and scale. Candidates should have 5+ years of software development experience, proficiency in Python and Linux, and experience with cloud platforms (GCP preferred).

Data Analyst needed to examine and interpret complex data sets, derive insights, and support business decision-making. Responsibilities include designing data solutions, developing data models, and collaborating with teams to communicate findings. Proficiency in SQL, data visualization tools, and statistical analysis techniques required.

Experienced Pre-Sales & Account Manager to drive business growth by building customer relationships, identifying opportunities, and supporting the full sales lifecycle.

Systems Engineer needed to analyze customer needs, develop system requirements, and troubleshoot hardware, software, and system problems. Requires a degree in Electronic, Communications, or Telecommunications Engineering and experience in design documentation. Senior roles require network certifications and experience with virtual and hyperconverged infrastructure.

Full-Stack Python Engineer needed to build, scale, and maintain web applications. Requires 4+ years of experience, proficiency in Python (Django, Flask, or FastAPI), Node.js, React.js, and cloud platforms.

Mid-Level Product Designer to join the Product Design team on a full-time, fixed-term contract. Work with Product, Engineering and stakeholders to shape user-centered solutions. Create user flows, wireframes, prototypes and UI designs. Support active product initiatives from discovery through to delivery.

Brix IT seeks Backend Developers (Lead & Junior) with experience in Spring Boot/Quarkus, Kafka, DevOps, and API management platforms. Strong communication, problem-solving, and learning abilities are essential.

Senior Backend Engineer to design, develop, and maintain backend services for smart locker solutions. Experience with NodeJS, Python, MongoDB, MQTT, and AWS required. Contribute to a fast-growing, innovative team.

Data Engineer with 5+ years of experience in cloud solutions sought for a hybrid role in the Automotive Tech sector. Responsibilities include designing, implementing, and deploying corporate IT applications within a cloud-based data analytics environment. Strong understanding of data modeling, ETL processes, and cloud data warehouse environments is required.

Provide technical support via phone and email to Nox Medical customers using diagnostic hardware and software. Resolve technical issues, communicate product performance information, and collaborate with teams to elevate complex support cases.

German-speaking Customer Service Advisors provide phone, email, and chat support to customers. Fluency in German and English is required.

The Associate Medical Director provides medical, clinical, and scientific expertise to IQVIA divisions. Serves as a Global Medical Advisor on assigned projects, offering guidance on medical and scientific aspects. Requires a medical degree, medical license, and 9+ years of experience in clinical medicine and clinical trials.

Develop and maintain .NET applications, design microservices architectures, and build RESTful APIs. Experience with Docker, Kubernetes, Azure, and CI/CD pipelines required.

Senior QA Engineer to perform manual testing of web applications and validate AI-generated outputs. Design and execute test cases across UI, API, and AI behavior scenarios using TestRail, Postman, and JIRA. Evaluate model quality metrics and ensure accuracy, completeness, and alignment across prompt-response workflows.

Design Lead will create digital products, collaborating with clients and internal teams. Responsibilities include developing concepts, user flows, visual design, and prototypes.