Full-Stack .NET Developer – API Integrations

Description

Job Summary: We are seeking professionals with experience in .NET development to design, develop, and maintain services and applications, collaborating across the full software development lifecycle within an innovative environment. Key Highlights: 1. Daily challenges and continuous learning in the Technology field 2. Integration into technology consulting projects with recognized clients 3. Part of a young team with innovative ideas **What We Are Looking For?** ------------------ We seek professionals who thrive on daily challenges and wish to continuously learn and specialize in the Technology field. Our employees are our top priority: we build strong teams by helping them achieve their goals and enabling them to deliver their best while collaborating with our clients. We want our employees to grow with us and achieve all their professional and personal goals. **What We Offer?** ------------------- All our employees enjoy these benefits. **24 working days of vacation****Annual bonus****Competitive salary****Training****Positive work environment****Private health insurance** We aim to hire professionals specialized in .NET development for one of our clients in the Financial sector, on a long-term project with an indefinite contract. The physical location of the project is Barcelona, with a hybrid remote work model (3 days onsite, 2 days remote). We seek developers with at least 3\-4 years of experience. Join us!!! In compliance with current data protection regulations, we inform you that the controller of your personal data is CONYSEL 15 SL, and your data will be used for internal personnel selection processes, both current and future. Applying to this job posting implies your authorization for us to process your data. Your CV data will be retained for a maximum period of one year within our organization, or until you exercise your right to erasure. Your data will not be shared with third parties except where required by law. You may exercise your data protection rights or request further information at info@conisel.com. (General Data Protection Regulation EU 2016/679\) ### **Requirements** 3\-4 years of experience developing with Microsoft technologies. Solid experience with C\# and .NET (preferably .NET Core / modern versions). Practical experience with REST APIs (design, consumption, authentication, versioning). Proficiency with JSON and XML in integrations. Experience integrating applications/systems (middleware, lightweight ETL, services, queues, or integration patterns as context demands). Knowledge of SQL databases (SQL Server or others): queries, stored procedures, basic optimization. Familiarity with version control (Git) and teamwork. API testing using tools such as Postman and adherence to good testing practices (unit/integration).### **Responsibilities** Design, develop, and maintain services and applications using C\# and .NET (.NET Core/modern versions). Build and consume REST APIs and integration services (including error handling, retries, and traceability). Work primarily with JSON and XML payloads (mappings, validations, transformations) and end-to-end integrations. Integrate logistics systems: WMS/SGA, and typical warehouse/distribution workflows (receipts, inventory, orders, shipments, tracking, incidents) according to business needs. (Functional-level responsibility description; exact details will be adapted to your specific context.) Participate in the full SDLC: requirements gathering, design, development, testing, deployment, and support. Debugging, troubleshooting, and performance improvement (including stability of integrations and internal applications). Document integrations (contracts, endpoints, mappings, flows, and technical decisions). Collaborate with Operations, IT, vendors, and/or partners to ensure robust integrations. ### **Technologies** .NET \+3 years C\# \+3 years .NET CORE \+3 years JSON \+3 years API REST \+3 years POSTMAN \+3 years SQLSERVER \+3 years ASP.NET \+3 years WEB API \+3 years XML \+3 years DEVOPS \+3 years Below are some of the benefits of joining our team: * You will be part of a young, innovative team * You will have the opportunity to join one of our recognized clients * You will participate in technology consulting projects that enhance your expertise We are an organization whose culture is grounded in the following principles: * Transparency * Trust * Professionalism * Competitiveness These four elements guide our internal dialogue, as well as how we behave and communicate with our clients. Our purpose is to deliver solutions to our clients and foster growth for our employees, maintaining long-lasting relationships rooted in continuous improvement. Not all our openings and opportunities may align with your current needs or preferences. Once again, we encourage you to contact our HR team, who will surely guide you and discuss realistic opportunities with you. We would be delighted to speak with you!