Senior Fullstack Developer (React + .NET)

Salary: 900 - 1300 pln/md B2B

Remote: Elastic hybrid from Gdynia or Warsaw (1 day per week in the office)

Why choose this offer?

• Work closely with a cross-functional product team, including the Head of Product and Tech Leads, to shape the architecture of a mission-critical SaaS platform
• Join a product with real-world operational impact, supporting international maritime logistics and vessel operations at scale
• Be part of a forward-thinking team that values autonomy, clean code, modern architecture and strong product ownership
• Enjoy the stability of an established industry group combined with the agility of a startup-like culture

Project

We are seeking a Senior Fullstack Developer with a product-focused mindset to join a long-term project in the maritime SaaS domain. The platform is designed to digitize and optimize ship management across technical, operational, and commercial areas. You'll play a key role in delivering intuitive, scalable, and high-performance user interfaces that support mission-critical workflows in a demanding operational context. This is an opportunity to bring your fullstack expertise into a product team that cares about architecture, usability, and performance. If you enjoy integrating fullstack area with Azure-based APIs, and you're driven by clean code and purposeful product development, this role is for you.

Responsibilities 

• Lead the design and implementation of high-performance, scalable, and accessible front-end applications using React and TypeScript
• Build and maintain reusable UI components and actively contribute to the platform’s design system, ensuring visual and functional consistency across products
• Collaborate with product owners, UX/UI designers, and backend engineers to deliver polished, user-centric front-end experiences supported by robust .NET services
• Integrate front-end applications with Azure-hosted APIs, ensuring efficient data flow, real-time updates, and reliable communication with backend systems
• Apply and advocate for front-end best practices—covering performance optimization, maintainability, accessibility, and usability
• Contribute to backend development in .NET when needed to support front-end features, integrations, or architectural improvements
• Participate in architectural and technical discussions, influencing the long-term roadmap with a strong front-end perspective

Expected competencies and knowledge

• 5+ years of professional experience in software development, including significant hands-on work as a Fullstack Developer in SaaS or enterprise-grade applications
• Strong expertise in React and TypeScript, with solid experience in modern front-end development (HTML5, CSS/SCSS, responsive design)
• Proven experience in building and maintaining front-end architectures based on reusable components and state management
• Good working knowledge of .NET / C#, including designing and integrating RESTful APIs and backend services
• Solid understanding of asynchronous data handling, API integration, and performance considerations across the full stack
• High standards for UI quality, UX, and accessibility, with a strong user-centric mindset
• Familiarity with CI/CD pipelines, Git-based workflows, and modern development tooling across frontend and backend
• Strong communication skills and a collaborative attitude, with experience working effectively in distributed, cross-functional teams
• Experience working with cloud platforms (Microsoft Azure preferred, or equivalent) and understanding of cloud-based application architectures (nice to have)

Technologies you'll work with

• React
• TypeScript
• SCSS / CSS-in-JS
• Tailwind
• REST APIs
• .NET Core / C#
• Azure
• SQL Server
• CI/CD (GitHub Actions)
• Kubernetes

Client – why choose this particular client from the Jit portfolio?

Our client is a leading provider of cloud-based ERP solutions for the maritime industry. With strong backing from a global group and over a decade of industry expertise, they combine technical excellence with deep shipping domain knowledge. Their mission is to digitize vessel operations, enabling global shipping companies to operate more efficiently, safely, and sustainably. As part of this project, youll contribute to international trade, environmental compliance, and the future of maritime logistics.

About Jit Team

The 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 700 experienced experts. We create highly specialised teams for clients from all over the world. We offer team members developmental projects, a wide range of benefits and a proprietary professional development programme.

Behind our maxim are also charitable and educational activities. We support pupils and students by donating learning equipment. We offer internships to help launch careers in IT. We support water rescuers and hospitals by providing the necessary equipment. We are a Polish company and we share what we have achieved over 15 years of activity. By supporting indigenous initiatives, we ensure the circulation of good energy.