freelance English-speaking jobs in Valongo

Lead Flutter Mobile Engineer to design, architect, and deliver high-quality mobile applications. Manage and mentor a team of developers, provide technical leadership, and collaborate with stakeholders.

The Senior Analyst, Data Science & Value Optimization will design and implement data-driven frameworks to enhance value delivery across Pricing, Pre-Sales Enablement, and Customer Success. This role requires proficiency in advanced analytics, business intelligence, and automation to support scalable solutions.

Senior/Expert Oracle PL/SQL Developer sought to solve complex challenges and optimize performance in large-scale data environments. Requires 4+ years of PL/SQL development, database performance analysis, C#/.NET knowledge, and experience with Agile methodologies.

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.

Software Operations & Process Excellence Specialist designs end-to-end business processes for software, defines access and lifecycle rules, and reduces friction in order-to-cash processes.

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.

Backend QA Engineer will design and execute tests for APIs, databases, and backend services. Collaborate with engineers to ensure high-quality standards. Requires 2-3 years of experience with Node.js, TypeScript, PostgreSQL, and API testing tools.

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.

Manage electronics obsolescence for legacy wind turbine control units and modules, ensuring long-term producibility and compliance. Coordinate obsolescence work packages, mitigate risks, and assess alternative components. Support redesign activities and act as a technical focal point for legacy electronics.

As a Forward Deployed Engineer, you will work with enterprise IT and software teams to implement AI solutions in production environments. You will identify opportunities, design architectures, and build systems that deliver operational improvements. You will leverage AI in your development workflow, experiment with models and orchestration patterns, and translate operational problems into technical solutions.

Leads the implementation, support, and evolution of transportation technology solutions within J&J's supply chain. Responsible for technical leadership, stakeholder collaboration, and continuous improvement of transportation applications. Drives development and selection of technical solutions, tests concepts, and documents system enhancements. Collaborates with business product managers and development teams to define product strategy and gather requirements.

Senior Java Engineer with 5+ years of experience in Java and Spring Boot microservices. Experience with Kafka, NSQ, RabbitMQ, AWS, Kubernetes, Terraform, and observability tools. Develop AI-powered customer interaction services using agentic AI principles. Excellent communication skills in English required.

Senior DevOps Engineer needed to design, maintain, and optimize CI/CD pipelines for software delivery. Responsibilities include automating deployments, managing deployments within Plesk environments, and ensuring proactive monitoring of infrastructure and applications. Requires proven experience in DevOps or Cloud Infrastructure roles, strong CI/CD pipeline design experience, and proficiency with GitHub Actions, AWS CodeDeploy, and AWS environments. French fluency is required.

Builds predictive ML models for core banking products and uses LLMs to prototype new product ideas and evaluate response quality. Partners with product, engineering, and domain teams to translate banking problems into ML and AI approaches.

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.

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.

Data Analyst will produce statistical reports analyzing internet performance for Government customers. Responsibilities include leading analytical projects, collaborating with data scientists, developing data pipelines and dashboards, and identifying growth opportunities. Requires strong R skills, SQL, and experience with data wrangling and visualization.

Salesforce Developer with 3+ years of experience in Apex, Visualforce, and Salesforce platform customization (Sales, Service, Marketing Cloud). Must have REST/SOAP API integration experience and fluency in English.

Experienced HR professional to oversee day-to-day HR operations across multiple European countries. Responsibilities include service delivery, compliance, escalation management, and process improvement. Requires 7+ years of HR experience, strong leadership skills, and knowledge of regional employment laws. Fluency in English and additional regional languages preferred.

Senior Systems Analyst / IT Solutions Designer for Finance Implementation Projects. Designs and implements technical solutions for financial interfaces, contributing to the global rollout of a General Ledger system. Requires 3+ years of experience in banking, accounting, finance, or IT systems.