Senior Fullstack Developer .NET

At OrtaX, part of Centric, you will work on software that supports municipalities in carrying out the WOZ process efficiently, reliably and transparently. Our ambition goes beyond maintaining existing software. We continuously develop OrtaX and invest in new technology, data, automation and a future-proof architecture. As a Senior Fullstack Developer, you play an important role in this. You naturally move between frontend and backend, help build new functionality, and at the same time help modernize our application step by step. We specifically look to you to help provide technical direction and structure. Not by making decisions alone, but by sharpening technical questions, bringing different perspectives together and, together with the team, arriving at good, supported solutions. 1. What will you do? As a Senior Fullstack Developer, you work together with developers, analysts and other specialists on the further development of OrtaX. You are not only responsible for your own code, but also look at the coherence and quality of the solution as a whole. Among other things, you will be occupied with: - developing new backend functionality in C#/.NET; - designing and developing frontend functionality with one of the major frontend frameworks; - designing and improving APIs, integrations and data solutions; - creating technical designs that connect frontend, backend and data; - writing and encouraging maintainable, testable and high-quality code; - contributing to CI/CD, automated testing and DevOps; - analyzing complex technical questions and translating them into pragmatic solutions; - introducing technical structure and safeguarding coherence between different parts of the application; - giving direction to architecture and design choices and making the consequences of different options transparent; - guiding technical discussions and ensuring that the knowledge and ideas of other team members are taken into account; - supporting fellow developers with complex technical questions; - recognizing technical debt, risks and opportunities for improvement and making them open for discussion; - modernizing existing parts of OrtaX step by step. You work on a mature product in which a continuous trade-off is made between delivering value today and building the architecture of tomorrow. As a senior developer, you help the team make this trade-off consciously. Sometimes that means investing in a structural technical improvement, and sometimes choosing a pragmatic solution that fits the situation. 2. The technical challenge OrtaX has an existing software landscape and a clear modernization task. As a result, you work not only on the question: "How do we build this feature?" but also on questions such as: "How does this solution fit into the rest of our architecture?" "Which choice helps us not only today, but also in a few years?" "How do we prevent different parts of the application from each going their own way?" And perhaps even more importantly: "How do we as a team arrive at a technical choice in which different insights are well taken into account?" As a Senior Fullstack Developer, you take the lead in this. You can structure a technical question, explore alternatives and propose a direction. At the same time, you understand that the best technical solution is rarely devised by one person. You actively seek discussion with other developers, listen to arguments and use the expertise within the team to make the final solution better. At OrtaX we use AI as an important tool in the development process. We also believe that the developer is responsible for delivering good code and a clear architecture. In the long term too, we want a product that is easy to maintain. AI is now an essential tool, but not without input from the developer. Technical leadership with us therefore does not mean deciding what others must build, but giving direction, bringing structure and helping the team make better technical choices. 3. Who are we looking for? We are looking for an experienced developer who truly feels at home on both sides of the stack. For this senior role, we are therefore not looking for a backend developer who occasionally does frontend work, or vice versa. You do not need the same depth in everything, but you are able to work independently on both frontend and backend and can oversee technical questions across the full chain. You: - have a university of applied sciences or university work and thinking level in Software Engineering, Computer Science, Informatics or a comparable field; - have extensive professional experience with C# and .NET; - have extensive experience with modern frontend development and can work independently with one of the major frontend frameworks; - have experience designing and building APIs and integrations; - have solid knowledge of databases and understand how choices in the data layer affect backend and frontend; - can design technical solutions across multiple layers of an application; - have a good understanding of software architecture and can apply architectural principles without losing sight of pragmatism; - have an eye for aspects such as maintainability, testability, performance, security and technical debt; - are used to working with CI/CD, automated testing and an Agile/Scrum way of working; - can structure complex technical questions and reduce them to clear choices; - dare to make decisions when necessary and can clearly explain why a certain direction is chosen; - at the same time are open to other insights and are willing to question your own solution; - help less experienced developers grow by sharing knowledge, giving feedback and searching for solutions together; - communicate easily with developers, analysts and other colleagues. What makes you senior? For us, seniority does not lie solely in the number of years of experience or how many technologies you master. We are looking for someone who looks beyond the boundaries of an individual feature. You see patterns and dependencies, recognize when a technical choice has consequences for other parts of the system, and bring structure when a question becomes complex. You are also someone colleagues can approach when a technical question gets stuck. Not because you always have the answer immediately, but because you can help sharpen the problem and jointly reach a good solution. In doing so, you can lead without wanting to decide everything yourself. You give direction when needed, but also create room for discussion, other ideas and the expertise of your colleagues. 4. Why OrtaX? OrtaX supports municipalities and collaborative partnerships in the WOZ process and focuses on consistent, explainable valuations and smart automation. In doing so, we invest in technologies such as data analysis, AI, automation and integration. As a result, you work on software with a very concrete societal application. At the same time, you enter an environment in which a lot still needs to be developed and modernized technically. For a Senior Fullstack Developer, this means that you not only join an existing technical environment, but can truly influence how OrtaX develops technically further. You get the space to bring structure, help make technical choices and set improvements in motion. At the same time, you stay close to the technology yourself and help build the solutions that follow from it. You thus get the combination of a mature product, a substantial technical modernization task and the opportunity to shape the technical direction together with the team. 5. What do we offer you? The salary is between € 5600 and € 7200 per month (in addition you receive a variable reward, a fixed 13th month and 8% holiday allowance), depending on your role, competency profile and experience. Furthermore, we offer excellent conditions, including: - participation in a good pension scheme - 27 vacation days (based on a full-time contract) - the option to buy extra vacation days - hybrid working from home and the office in Amsterdam (of course you are welcome to work at the office every day) - travel expense reimbursement for your daily commute and any business travel - opportunities to develop yourself with a training program and weekly research and knowledge meetings - you start with a one-year contract, after which there is a prospect of a permanent contract, as we strive for a long-term collaboration - a pleasant work environment with enthusiastic and fun colleagues! 6. About OrtaX OrtaX supports municipalities and collaborative partnerships in carrying out the WOZ process efficiently, reliably and transparently. The ambition is to support appraisers with smart automation and at the same time to invest in new technology, process automation and integration. In doing so, we work not only on what OrtaX needs today, but also on what the product must look like technically tomorrow. Do you, as a Senior Fullstack Developer, want to not only build OrtaX but also help determine how we continue to build it? Then we would love to get to know you.