Senior .NET Developer (C#/.NET) - Hybrid Porto (2 days/week office)

Senior .NET Developer (C#/.NET) - Hybrid Porto (2 days/week office) ABOUT THE OPPORTUNITY We're looking for a Senior .NET Developer to join a well-established international organization in the telecommunications sector, working on business-critical systems that support large-scale operations. This is a chance to take real end-to-end technical ownership, working from architecture and design through to production support, on a team that values engineering craft, pragmatic decision-making, and mentorship over process for its own sake. PROJECT & CONTEXT You'll join the engineering team behind a large-scale telecommunications platform for an international company with operations across Europe. The team designs and evolves scalable, distributed C# .NET solutions, with modern DevOps practices — CI/CD via Azure DevOps, Infrastructure-as-Code with Terraform, and observability tooling — embedded directly into the development lifecycle. You'll work closely with Tech Leads, QA, and Product to deliver reliable features end-to-end, while helping raise the engineering bar through code reviews, pairing, and mentoring junior and mid-level engineers. WHAT WE'RE LOOKING FOR (Required) 5+ years of professional software engineering experience with a proven track record operating production systems at scale Deep proficiency in C# and modern .NET development Strong experience designing and deploying solutions in an Azure Cloud environment Solid understanding of distributed systems, APIs, and scalable architecture patterns Experience implementing CI/CD pipelines and automated deployment strategies (Azure DevOps) Demonstrated experience owning the design of distributed systems and leading engineers across teams without direct authority Proven ability to mentor and elevate other engineers through pairing and code review Strong testing practices across unit, integration, and UI automation, with thorough code review habits Experience working in Agile delivery teams with ownership of technical outcomes Bachelor's or Master's degree in Computer Science, Engineering, or a related field (or equivalent practical experience) Fluent English, B2 (Upper Intermediate) minimum — required NICE TO HAVE (Preferred) Experience with React, HTML, CSS/SCSS for front-end collaboration Familiarity with Docker and containerized environments Experience with observability stacks such as Prometheus, Grafana, Loki, or Azure Application Insights Experience using AI-assisted development tooling (e.g., GitHub Copilot, MCP servers) Hands-on experience with Terraform / Infrastructure-as-Code Want me to save this to the project as a doc, or produce a second version assuming Consulting (or Direct Hiring) with a placeholder minimum you can fill in?