freelance English-speaking jobs in Valongo

Senior HTML/Markup Developer to join a development team in Lisbon. Develop efficient, fast, and adaptive layouts of interfaces. Collaborate with developers and web designers. Requires 5+ years of experience as an HTML coder with excellent knowledge of HTML and CSS.

The IT Workplace & Device Specialist oversees planning, implementation, and support of workplace IT infrastructure and services. This includes endpoint device management, collaboration tools, software deployment, user support, and ensuring a productive digital environment.

We are hiring for Customer Support, Sales, and Specialist roles across multiple industries in Greece, Spain, and Portugal. We seek fresh graduates and experienced professionals with C1/C2 proficiency in various languages. EU citizenship, work permit, or refugee status is required.

Senior SAP FI Accounting Consultant needed for IT template developments and support. Responsible for system stabilization of Treasury processes and implementation of new business requirements in SAP R3 for over 40 legal entities. Will support the establishment of a medium-sized company by copying the ERP system, migrating data, and implementing new Finance and Controlling processes and systems. Coordinate process adjustments, standardizations, and optimizations. Act as the interface between Finance and Controlling and other departments, IT, and central areas. Ensure knowledge transfer and support for global locations for Finance and Controlling questions.

Lead technical offensive and defensive security strategies, focusing on application security, penetration testing, and cloud infrastructure. Specialize in securing the lifecycle of Large Language Models (LLMs) and AI integrations. Conduct deep-dive penetration tests, develop exploits, and perform secure code reviews. Design and implement defenses against AI attacks, establish audit frameworks, and build custom security tooling. Act as the "Security Architect of Record" for projects and mentor senior engineers.

Robotics Engineer will design and engineer mobile robotic systems, focusing on software development and algorithm integration. Responsibilities include specifying, designing, and implementing software for autonomous mobile robots, developing automated testing software, and coordinating design integration across teams.

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

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

Night Auditor needed for a new 16-villa resort in Comporta, opening in Q2 2026. Responsibilities include end-of-day financial procedures, guest support during the night shift, and maintaining brand standards. Previous hospitality experience, strong analytical skills, and fluency in English and Portuguese are required.

Drive innovation in multi-modal reinforcement learning to advance intelligent systems. Develop and scale reinforcement learning techniques within complex multi-modal architectures. Conduct research on reinforcement learning algorithms for multimodal models, including diffusion-based approaches for image and autoregressive models for multimodal understanding. Design and build reinforcement learning infrastructure that supports scalable, distributed training across multimodal systems. Develop and refine reward modeling strategies that improve training stability and mitigate reward hacking. Create and curate multimodal simulation environments and datasets to support robust training, evaluation, and benchmarking of reinforcement learning systems. Publish research findings in top-tier conferences.

Accountant will manage financial records, ensure regulatory compliance, and report to the Regional Finance Manager for Germany and Austria.

Senior Microsoft Solutions Consultant to lead complex projects, develop and implement Microsoft-based solutions, and provide technical consulting to optimize client environments.

Customer Service Representative will handle inbound customer requests, provide pre-sales, general inquiries, and technical support via multiple channels. Must be fluent in German (written and oral) and English (B2).

Leads multiple IT initiatives within Corporate Functions, overseeing delivery across development, QA, and support teams. Drives excellence in software delivery, quality, and innovation across three international hubs. Champions AI tool adoption and modern engineering practices.

Provide French-speaking customer support for digital payment platform users. Resolve technical issues, ensure data security, and collaborate with global teams.

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.

UNU-EGOV seeks two Junior Research Consultants to support digital transformation and public sector innovation projects. Responsibilities include research, analysis, report writing, project support, and stakeholder engagement. Candidates should have a master's degree in a relevant field and strong English skills.

We are seeking a .NET Developer with 5+ years of experience in C# and the Microsoft ecosystem. Must have in-depth knowledge of Kafka and experience with event-driven architectures, microservices, and RESTful APIs. Strong database skills (PostgreSQL and MongoDB) and understanding of object-oriented programming are required. Fluency in Portuguese and English is essential.

Bloomie is seeking a driven Sales Development Representative to generate new business opportunities and engage with HR leaders across Europe. This role involves outbound prospecting, qualifying leads, and collaborating with cross-functional teams.

The HR Manager directs and oversees daily Human Resource Office activities including recruitment, compensation, training, labor relations, and performance management. The role focuses on delivering HR services to meet employee and business needs while ensuring compliance with laws and regulations.