Middle Full Stack Developer (Logistics Domain)

Ready to shape the future of logistics technology? We are looking for a Middle/Senior Full Stack Developer to join our distributed team and help build a next-generation e-commerce fulfillment platform. This role offers remote flexibility with the option to work from Kraków, Poland. At Sigma Software, we partner with some of Europe’s most innovative companies, delivering solutions that combine cutting-edge technology with business impact. You will work in a collaborative Agile environment, leveraging modern frameworks and AI-assisted tools to create high-performance solutions. Why join us? You’ll be part of a long-term partnership, working on high-impact projects with access to advanced AI tools, cloud technologies, and a supportive team culture. CUSTOMER Our customer is one of Europe’s leading logistics providers, headquartered in Germany. Specializing in integrated supply chain systems and data-driven logistics optimization, they operate across multiple European markets, offering advanced warehousing, transportation, and fulfillment services. Sigma Software has been collaborating with them since 2017, delivering over 10 active projects that drive innovation and efficiency. PROJECT You will contribute to the development of a next-generation e-commerce fulfillment platform designed to automate and optimize order processing, inventory management, and delivery tracking. The solution leverages modern web technologies and AI-assisted development tools to ensure scalability and efficiency. This is a chance to work on a high-impact product in a collaborative, Agile environment. Design, develop, and maintain robust software applications using TypeScript/JavaScript, Node.js, NestJS, and React.js Implement new functionality from scratch, including role-based access control services, API integration services, and custom endpoints Work in an AI-augmented development environment, leveraging tools like Claude Code, Cursor, and Microsoft Copilot Collaborate closely with stakeholders to define, design, and deliver new features Ensure code quality, security, and performance through critical evaluation of AI-generated outputs Participate in SCRUM ceremonies and contribute to team planning, estimation, and retrospectives 3+ years of commercial development experience with a focus on TypeScript/JavaScript Proven expertise in Node.js, NestJS, React.js, Next.js, and REST API development Knowledge of Go Experience with AI-assisted coding tools (Claude Code, Cursor, Microsoft Copilot, or similar) Ability to write clear prompts for code generation and refactoring Skills in evaluating AI-generated code for security and performance implications Experience translating AI-generated specifications into implementation tasks Proficiency in debugging and validating AI-generated code Familiarity with AI-driven development frameworks (BMAD, Superpowers, GSD, spec-kit, or equivalent) Experience with any cloud provider (preferably Azure) Experience working in SCRUM teams Fluent English WILL BE A PLUS Experience integrating and working with design systems (Tailwind, Storybook) Proven experience with AI-augmented development (pet projects, certifications) Participation in AI-assisted requirements breakdown and task decomposition using frameworks like spec-kit or BMAD PERSONAL PROFILE Strong communication, multitasking, and problem-solving skills Analytical thinking and sound technical judgment Quick grasp of existing digital products and architectures