Senior FullStack Developer (.Net / React)

Salary: 1200-1320 PLN/day on B2BWork model: hybrid from Gdynia (3 days per week from the office) Why choose this offer? Join a global team building scalable, cloud-based solutionsWork on impactful projects that drive digital transformation and sustainability in sectors like energy, maritime, and manufacturingBe part of a stable, international work environment focused on quality, innovation, and efficiencyThe Jit Community will bring you a nice time during regular integration meetings ProjectThe project focuses on developing a digital platform for the maritime industry, supporting fleet CO2 emissions reporting and verification. The platform is built on a modern microservices architecture using Microsoft technologies, Azure, and selected open-source solutions, with a strong focus on scalability, reliability, and digital transformation. ResponsibilitiesCollaborate with international development teams to design solutions and deliver projects. Design and develop data-driven applications and scalable software solutions. Build and maintain robust services and APIs. Develop reusable code, components, and libraries. Optimize applications for performance, reliability, maintainability, and scalability. Use AI-assisted development tools to support coding, testing, documentation, and problem-solving. Contribute to technical discussions, knowledge sharing, and continuous improvement. Expected competences and knowledge8+ years of professional experience in software development. Strong experience with C#/. NET, MS SQL, React, and TypeScript. Good understanding of microservices architecture, APIs, and modern system design principles. Experience with Web API, GraphQL, Web Components, and Azure Service Bus. Experience across the full software development lifecycle, including design, development, testing, deployment, and maintenance. Practical experience using AI-assisted development tools, such as Microsoft Copilot or similar solutions, in daily engineering work. Experience working in Agile environments. Strong communication skills and fluent English. Bachelor's or Master's degree in Computer Science, Software Engineering, or a related field, or equivalent practical experience. Technologies you'll work withC# / . NETReact / TypeScriptMS SQLWeb API / GraphQLWeb ComponentsAzure / Azure Service BusMicroservicesMachine Learning / AI-assisted development toolsOpen-source technologies Client – why choose this particular client from the Jit portfolio? Our Client has been in the business of providing safety and insurance for the maritime industry for over 160 years and is now the leading provider of security certification and audits. They offer a wide range of digital projects to increase safety and compliance with standards in industrial fields. Our Client's solutions are used in the maritime industry, from raw materials extraction, to anywhere else where there is a need for quality and compliance with norms and standards. We have been working with our Client since 2013, creating and maintaining applications that are utilized in high-risk areas like rigs, mines, and police units, striving to make the world a safer place. Our Client's commitment to safety, ecology, and quality, which has its roots in Scandinavian culture, is implemented on a global scale. About Jit TeamThe Human Factor of IT - it’s not just a slogan, it’s a philosophy. The foundation of Jit Team is people, which is why we prioritise you. We employ over 770 experienced experts, to whom we offer developmental projects, a wide range of benefits, and a proprietary professional development programme. Together with clients from around the world, we create innovative IT solutions delivered by highly specialised and efficient teams. Behind our maxim are also charitable and educational activities. We support schools, universities, and educational institutions by conducting workshops, running educational projects, sponsoring events, and donating learning equipment. We offer internships that help launch careers in IT. We support water rescuers and hospitals by providing the necessary equipment. We also support numerous charitable organisations helping people in need, children, and the elderly. We are a Polish company and we share what we have achieved over more than 15 years of activity. By supporting local initiatives, we contribute to the circulation of good energy.