Senior Fullstack Developer

About the Position

Senior Fullstack Developer

📍 Lisboa

🌐 Hybrid (2 days per week)

🕘 Full-time

💼 5+ years exp.

Welvaart is seeking a Senior Fullstack Developer to join our team in Lisboa. This role is hybrid, requiring 2 days per week on-site.

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About Welvaart

At Welvaart, we are committed to creating a structure of human values based on professionalism, honesty, and rigor. Our management is based on Human Centered Design, ensuring consistent career plans that are flexible to the needs and expectations of our professionals. Our empathetic and present leadership guarantees superior technological engagement and delivery to our clients' projects and products.

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Responsibilities

• Design, develop, and maintain scalable full-stack applications with a strong focus on backend architecture and performance.
• Build and optimize modern Angular applications using the latest features (e.g., Signals) while ensuring maintainability and scalability.
• Lead frontend-backend integration, ensuring seamless communication between UI, APIs, and distributed systems.
• Develop robust backend services using the latest versions of.NET and C#, following best practices and modern architectural patterns.
• Apply clean architecture, Domain-Driven Design (DDD), and microservices principles to build modular and scalable systems.
• Implement and maintain backend components such as middleware, filters, dependency injection (DI), and pipeline patterns.
• Optimize database interactions using Entity Framework and SQL, focusing on performance and query efficiency.
• Contribute to event-driven and distributed architectures using patterns such as Observer and technologies like Azure Functions, queues, and pipelines.
• Actively identify technical challenges and propose effective, high-quality solutions independently.
• Collaborate with cross-functional teams while maintaining a strong ability to work autonomously.
• Ensure code quality through reviews, documentation, and adherence to engineering best practices.

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Requirements

• 6+ years of experience in full stack development, with strong backend expertise in.NET/C#.
• Proven ability to quickly onboard and work autonomously with minimal supervision.
• Strong experience with Angular (latest versions), including knowledge of new features such as Signals.
• Awareness of Angular's evolution and ability to compare modern vs legacy approaches.
• Experience with micro frontend architectures. Solid understanding of modern frontend development (TypeScript, component architecture, state management, performance optimization).
• Deep expertise in.NET and C# (latest versions).
• Strong understanding of design patterns and.NET best practices.
• Experience with: Middleware, Filters, and Dependency Injection
• Clean Architecture and DDD
• Microservices architecture
• Pipeline and Observer patterns
• Strong knowledge of database optimization (SQL, Entity Framework, query performance tuning).
• Experience working with cloud-native components such as: Azure Functions, Messaging systems (queues), Data pipelines

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What We Offer

• Be part of a tech start-up
• Different scopes of projects in different sectors
• Structure of fairness and equity salary (Consultant Profile)
• Training & Certification
• Career Path management
• More than 30 Partnerships
• Welvaart Ambassador Program

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