freelance English-speaking jobs in Barreiro

The Laboratory of Polymer Chemistry (PCL) is offering a 12-month research grant, renewable up to 36 months, for a First Stage Researcher (R1) in Materials Science and Engineering. The grant supports work on the MINEPIPE project, developing PE100-based formulations for high-performance pipes.

Vendor Management Officer needed for NATO Secret clearance position. Experience in vendor management, procurement, or contract administration required. Duties include onboarding/offboarding contractors, drafting Statements of Work, and recommending procurement strategies.

Senior product marketing leader to own market strategy, positioning, and go-to-market execution for stablecoin infrastructure and cross-border payment offerings. Responsible for shaping category narrative, enabling revenue growth, and positioning Anchorage Digital as the trusted institutional partner for stablecoin infrastructure.

Fluent Portuguese-Brazil speaker needed to support a streaming platform. Apply tags and metadata to video content, ensuring accurate data entry and optimal viewing experiences. Collaborate with a team to improve discoverability and ad-insertion. Must have experience with video editing or metadata management and a strong understanding of the digital content landscape.

Review and moderate user-generated content in Croatian to ensure compliance with community guidelines and policies. Identify and flag prohibited content such as hate speech, harassment, and misinformation. Apply moderation guidelines consistently and escalate complex cases.

Provides support to the Global Broker team in the annual Broker Fee reconciliation process and periodic reporting. Assists with collecting and consolidating global contract spend data, ensuring accuracy, and preparing analysis for the Broker team and Global Buyers. Supports the maintenance of contract terms and calculation rules in IT systems.

Kitchen Designer needed for Modulnova Lisboa showroom. Develop functional and beautiful kitchen layouts, select premium materials, and present designs to clients. Proven experience in kitchen design or a related field required.

Lead Backend Developer (Go/Kotlin) will design and develop scalable microservices, own infrastructure provisioning with Terraform, and migrate legacy systems to GCP. Requires 5+ years of backend development experience, proficiency in Go or Kotlin, and GCP expertise.

Linguist to support AI training initiatives and content creation. Responsibilities include creating linguistic content, resolving ambiguity and bias issues, performing QA on model outputs, annotating datasets, and conducting linguistic research. Requires deep understanding of linguistic theory and language structure. Experience with computational linguistics, corpus analysis, or LLM training is a plus.

Network Automation Engineer to support, maintain, and optimize large-scale automation platforms and workflows. Troubleshoot automation processes, manage service templates and device configurations, and ensure platform stability. Requires strong hands-on experience with network automation platforms, including data modeling, service templates, and multi-vendor device integrations. Experience with workflow automation engines and integration gateways is also needed. Must have strong understanding of Layer 2/Layer 3 networking and familiarity with Postman, Jira, Linux-based environments, and REST APIs. Fluent in Italian and English.

Natural resource conservation scientists evaluate AI systems trained on environmental science and conservation. Review training content, assess scientific accuracy, and provide feedback to improve AI outputs.

Renvolt Energy seeks a Contract Manager to support EPC projects across all energies and geographies. Responsibilities include drafting contracts, analyzing and negotiating supplier contracts, managing changes and claims, and setting up contractual management processes.

iRESTORE seeks a Data Analyst to partner with Growth leadership, influencing revenue, contribution margin, acquisition efficiency, and forecasting accuracy. You will analyze revenue performance, monitor contribution margin, and identify drivers of change. You will build dashboards, support forecasting, and provide decision-support analysis. Experience with SQL, BigQuery, Looker Studio, and AI-assisted coding environments is required.

Ryanair Group is hosting a Cabin Crew Assessment Day in Porto on February 27, 2026. Successful applicants will participate in a 6-week training course to become qualified cabin crew members. The role requires the ability to swim 25 meters, be between 5'2" and 6'2" tall, and have the unrestricted right to live and work in the EU. Applicants must be comfortable working a shift roster, enjoy dealing with the public, and have excellent customer service skills. Fluency in English is required.

The Global Logistics Lead will develop and implement a global logistics and supply chain strategy, leading international teams and managing global process experts. Responsibilities include monitoring KPIs, promoting digitalization, ensuring uniform standards, and managing transport, freight, and inventory strategies.

Business Analyst to scale and evolve SaaS platform for mortgage brokers and credit intermediaries. Translate business and customer needs into product requirements and user stories. Collaborate with product, engineering, design, QA, and customer success teams.

Build and own an investor-grade group consolidation backbone for n8n, a rapidly growing open-source workflow orchestration platform. Responsibilities include monthly, quarterly, and annual group consolidation, IFRS reporting, and intercompany accounting. Must have 8+ years of accounting experience with hands-on ownership of IFRS consolidations, eliminations, and adjustments. Strong working knowledge of IFRS 15, IFRS 16, IFRS 2, FX accounting, and development cost capitalization in a SaaS context is required.

The Contract Manager oversees a team responsible for administrative contract management, ensuring fulfillment of client and internal requirements. Responsibilities include team leadership, contract review and negotiation, and issue resolution. Requires a Bachelor's Degree or equivalent experience, strong leadership skills, and proficiency in Microsoft Office.

Junior Order to Cash Specialist will manage O2C and Accounts Receivable processes, monitor customer accounts, and support billing, collections, and dispute resolution.

Senior Android Developer will design, develop, and deliver high-quality, scalable Android applications. Responsibilities include writing clean, maintainable code, providing technical leadership, and contributing to the entire development cycle. Requires experience with native Android languages, Android development, and Restful APIs.