Software Developer (.NET)

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.

Key Responsibilities

- 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

Technical Skills

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

Professional Competencies

- 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

Mindset & Ways of Working

- 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

Practical Information

- Location: Lisbon

- Working Model: Hybrid – on-site presence required two days per week

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