freelance English-speaking jobs in Valongo

The British School of Lisbon seeks a Lead Chemistry Teacher to join their team in September 2026. Successful applicants will have a UK teaching qualification, at least 3 years of teaching experience in the UK, and exceptional subject knowledge. Experience teaching Science (Biology, Chemistry & Physics) in Key Stage 3 and Chemistry in Key Stage 4 (I/GCSE) is required.

A PhD student will develop and evaluate a decentralized data processing solution. Tasks include solution development, prototyping, integration, baseline system implementation, experimental evaluation, and report writing.

Review and monitor online content to ensure a safe and positive user experience. Evaluate flagged posts, apply guidelines, and take action to maintain platform standards. Fluent French (C1 or native level) and English required.

Director of Sales & Business Development will lead and shape the global commercial strategy for a deep-tech company specializing in advanced scientific imaging technology. Responsibilities include opening new markets, building a sales pipeline, leading deals, and developing the commercial team. Requires 10+ years of B2B technical sales experience, a track record of new business wins, and experience leading teams.

Senior .NET Developer with 5+ years of experience sought to develop and customize software components, ensure testing, and provide user support. Must have strong knowledge of .NET (C#), JavaScript, Angular, and Microsoft SQL Server.

Operating Center Engineer to ensure stability and reliability of critical systems and platforms. Responsibilities include monitoring system alerts, detecting anomalies, responding to incidents, and using ticketing systems.

Senior Back End Engineer will design and implement the streaming data platform engine and SDK. Responsibilities include implementing new features for web and streaming applications, collaborating with the team on technical choices, and using AI tools to boost productivity. Experience with Java, Spring Boot, AWS, Kafka, and data processing technologies is required.

Or a Lifetime Experience? Start Yours Here! Our mission is to be a meaningful part of our people's careers. As we grow, so does our determination to offer the best experience to our employees and clients — and that's exactly what drives us. We are a Portuguese technology consulting company with offices in Lisbon, Porto and Óbidos, and representations in Brazil, Tunisia and Cabo Verde.

The DLP Analyst will assess and analyze events generated by the DLP tool, investigate data leaks, and review security problems to identify weaknesses in the DLP monitoring system.

Provide technical support to clients via calls and email, monitor system connectivity, and resolve incidents. Analyze logs, alerts, and system failures. Strong communication and troubleshooting skills required. Fluent English and advanced French.

ManpowerGroup seeks a Compliance Professional to support the implementation of a new global ERP system. The role involves designing, implementing, and executing compliance policies, procedures, and controls, as well as performing compliance testing and collaborating with various teams.

Design and implement AI-powered SEO systems to drive organic growth for B2B SaaS companies. Build programmatic SEO frameworks, AI-assisted content pipelines, and scalable site architecture strategies. Optimize content for AI search visibility and experiment with new approaches to influence AI-generated results.

Business Travel Consultant fluent in German, Italian, French, or Spanish needed to provide travel support via chat, calls, and emails. Must have 2+ years of experience as a Travel Agent/Ticketing Agent and GDS experience (Sabre, Amadeus, or Galileo).

Receives, reviews, and barcodes spare parts. Enters orders into the E1 system and locates materials in the warehouse. Supports plant and maintenance orders and performs cycle counts. Responsible for inventory accuracy and master data integrity.

Experienced Mechanical Construction Managers needed for 18-month freelance contract in Portugal. Focus on Mechanical Piping, package design, installation, and fabrication across Pharmaceutical, Oil & Gas, Semi-Conductor, and Data Centre projects.

Customer Experience Specialist (German & English) will provide support to users and partners via email, chat, phone, and social media. Responsibilities include handling inquiries, resolving issues, and building positive relationships. Must be fluent in German and English. Experience with CRM software is preferred.

Atlassian Administrator needed in Lisbon. 5+ years of experience administrating Jira and Confluence, 3+ years with Atlassian Data Center, and English B2 required.

Lead SAP data migration activities including extraction, cleansing, transformation, validation, reconciliation, and loading. Manage data quality controls, error resolution, and documentation. Coordinate testing, mock loads, and cutover readiness.

Application Security (AppSec) Analyst to identify and manage application vulnerabilities throughout the SDLC. Responsibilities include operating security scanning tools, analyzing and prioritizing vulnerabilities, integrating security measures into CI/CD pipelines, and fostering secure coding practices. Proven experience in application security, proficiency with SAST/SCA platforms, and familiarity with CI/CD pipelines are required.

Senior Full Stack Engineer will design, build, and maintain robust systems, from intuitive frontends to scalable backends. Responsibilities include collaborating with product teams, ensuring privacy and security, and mentoring other engineers.