We are seeking an experienced Software Developer (.NET) to join an agile, cross-functional product team responsible for the design, development, and continuous evolution of a Gas Flow Management (GFM) digital platform.
The solutions developed by the team support end-to-end commercial and operational processes in large-scale energy infrastructure environments. These systems span the full gas flow lifecycle, including customer onboarding, contracting, demand handling, flow planning, network balancing, billing and invoicing, data publication, reporting, and business-to-business messaging.
This role offers the opportunity to work on a long-lived, mission-critical product, where software quality, architectural integrity, and business alignment are essential. You will actively contribute to feature design, system evolution, and technical decision-making in a context of high reliability and regulatory complexity.
Design, develop, and maintain high-quality, scalable, and maintainable .NET-based software components
Translate complex business and operational requirements into robust technical solutions in close collaboration with product owners and analysts
Contribute to architectural discussions, proposing improvements that enhance performance, reliability, and long-term maintainability
Implement automated tests and actively participate in functional and technical testing activities
Perform code reviews, share knowledge, and uphold agreed development standards
Support release preparation, including technical documentation and deployment activities
Participate in user acceptance testing (UAT) and product demonstrations, ensuring solutions are understandable and usable for business stakeholders
Handle functional and technical service requests, providing timely and effective support
Investigate and resolve incidents collaboratively, minimising operational impact
Monitor and troubleshoot issues across development, testing, and production environments
Actively participate in Agile ceremonies, including backlog refinement, sprint planning, reviews, retrospectives, and daily stand-ups
Contribute to the product backlog by creating technical items expressed in business-oriented language, supporting value-based prioritisation
Core Technologies
Backend: .NET 8 / .NET Framework, ASP.NET Web API, WCF
Data & Messaging: SQL Server, Oracle, RabbitMQ, NHibernate, Entity Framework
Architecture: Domain-Driven Design (DDD), Clean Architecture, design patterns
Testing & CI/CD: xUnit / NUnit, Azure DevOps Pipelines
Frontend: Blazor (nice to have)
DevOps & Tooling: Git, Azure DevOps, automated deployment and monitoring tools
Strong foundation in software design principles and clean coding practices
Experience working with complex, enterprise-grade systems and long-term codebases
Solid understanding of testing strategies and CI/CD pipelines
Ability to communicate effectively with both technical and non-technical stakeholders
Fluency in Portuguese and English (C1 level); knowledge of French or Dutch is an advantage
Product-oriented: You focus on delivering tangible value, not just completing tasks
Collaborative: You work effectively within multidisciplinary teams and value shared ownership
Analytical and Curious: You challenge assumptions and seek continuous improvement
Adaptable: You remain effective in changing environments and evolving priorities
Quality-driven: You prioritise sustainable, reliable solutions over short-term fixes
Accountable and Transparent: You take ownership of outcomes and communicate openly
Committed to Learning: You stay engaged with evolving technologies, domains, and practices
Location: Lisbon
Software Developer (.NET) • Lisbon, Portugal
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