freelance English-speaking jobs in Guimarães

Designs, builds, and implements SDN core network fabrics across multiple data center environments. Delivers greenfield Arista SDM fabrics ensuring high availability, resilience, and automation readiness. Supports strategic data center transformation programs.

Senior Data Warehouse Architect (Data Vault 2.0) will design, evolve, and optimize enterprise-scale data platforms. Collaborate with multidisciplinary teams to drive architectural decisions, establish best practices, and deliver modern data warehouse solutions.

Software Engineer with +5 years of .NET development experience (C#, .NET Core, ASP.NET, Entity Framework) and experience with AWS/Azure, microservices, and containerization tools (Docker, Kubernetes). Proficiency in English (B2 level) required. Hybrid work model (3 days/week in Porto) and occasional business trips. Must be based in Portugal with Portuguese or EU citizenship or a valid Portuguese work permit.

Principal Software Engineer to lead technical strategy for a high-revenue web platform and mobile app. Responsibilities include architecture design, server-side rendering, data layer management, and performance optimization. Must have experience with Node.js, React, MySQL, BigQuery, and GCP.

Optimization Scientist will model healthcare operational problems using Mixed-Integer Programming (MIP). You will translate academic research into practical solutions, formulate MIP models for scheduling, staffing, and resource allocation, and design objectives to improve efficiency.

Senior Developer will design, build, and operate cloud-native services on Azure using C#/.NET. Responsibilities include building and reading logs in the Integration Layer, contributing to a high-quality engineering culture, and shaping and maintaining infrastructure and CI/CD pipelines.

Application & Systems Integration Engineer will develop flexible thin film solar cells, conduct mechanical testing, and integrate solar cells into power systems.

Provides planned maintenance, troubleshooting, and service for automation systems products. Works independently and collaboratively on project implementations. Supports service sales by promoting solutions and training customers. Requires relevant educational background, experience in instrumentation, electronics, and electrical cabinets, and fluency in English.

Cleo is seeking a Frontend Engineer to build and ship high-impact web experiences using React and Next.js. You will collaborate with marketers, designers, data analysts, and UX writers to grow Cleo's reach and improve the financial health of users. Responsibilities include creating motion-led, visually engaging pages, owning pages end-to-end, and improving website performance and SEO.

Data Scientist to build data-driven products by turning complex data into actionable insights and deployable models. Develop and validate statistical and machine learning models, translate results into clear narratives, and create reusable data science assets. Requires a Bachelor's degree in a quantitative field and 3+ years of experience applying data science/advanced analytics. Strong Python, SQL, and experience with Databricks are needed.

Lead technical engagement with Tier-1 Service Providers throughout the pre-sales lifecycle. Design end-to-end service architectures, translate customer requirements into solution designs, and own technical responses to RFPs and RFIs. Advise customers on service design, platform integration, and migration strategies. Collaborate with bid teams, product management, and delivery teams.

Develop and optimize electrotechnical components for industrial production. Design, test, and validate electrotechnical systems while ensuring quality and safety standards.

An Internal Account Director develops and implements recruitment and retention (R&R) strategies to meet customer goals. They collaborate with sales, project teams, and customers to understand needs, develop solutions, and identify growth opportunities.

Lead and develop global customer support teams (L1 and L2) across Romania and remotely. Define and maintain operational boundaries between tiers, set performance expectations, and manage underperformance. Drive automation, AI, and process optimization to improve support efficiency and quality. Own day-to-day ticket operations, escalation pathways, and shift coverage. Analyze support data to identify trends, product gaps, and drive continuous improvement. Act as the voice of the customer, advocating for support insights in cross-functional discussions. Ensure seamless escalation coordination with Customer Success and champion a self-serve mindset.

An Internal Account Director develops and implements recruitment and retention (R&R) strategies to meet customer goals within assigned therapeutic areas. They work with sales, project teams, and customers to understand needs, develop solutions, and identify growth opportunities.

Build, operate, and shape the foundational infrastructure powering n8n Cloud. Responsibilities include designing, building, and operating infrastructure, driving observability and automation, contributing to on-call rotation, and collaborating with cross-functional teams. Must-haves include solid infrastructure/cloud/DevOps experience, application development with Node.js, CI/CD pipelines, observability and performance tuning, and proficiency with Kubernetes, Terraform, and one or more major cloud providers.

The OT SOC Manager will lead OT security operations, manage threat detection and incident response, develop security procedures, and oversee vulnerability management.

Citrix Expert required with expertise in Citrix CVAD, NetScaler, and Citrix ADM. Must have strong scripting and automation skills with PowerShell and experience designing, implementing, and maintaining secure Citrix environments.

Lead the design and implementation of enterprise-grade AI and Generative AI solutions. Define AI architectures, governance standards, and scalable, secure AI ecosystems.

Senior AI Security Engineer will design and implement security-by-design principles for AI systems, identify and mitigate AI-specific risks, and translate security frameworks into practical controls.