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Senior Fullstack Software Engineer (Remote - EU) at Jobgether. This position is posted by Jobgether on behalf of a partner company. We are currently looking for a . Senior Fullstack Software Engineer. in the . European Union. .. As a Senior Fullstack Engineer, you will be part of a high-impact team building a greenfield operational platform that powers large-scale e-commerce operations across global marketplaces. You’ll work end-to-end — from architecting and coding backend systems in Rust to designing dynamic frontends in React. This role offers an opportunity to shape the technical foundation from the ground up, tackle complex distributed systems challenges, and directly influence multi-million-dollar operations. You’ll thrive in an autonomous, fast-paced environment where innovation, reliability, and scalability meet.. . Accountabilities. Design, develop, and maintain end-to-end product features, from backend APIs to React-based user interfaces.. Build and optimize integrations with major e-commerce platforms such as Amazon, Shopify, and TikTok.. Architect reliable, scalable systems capable of handling asynchronous workflows, rate limiting, and distributed synchronization.. Develop queue-based async flows with robust error handling, ensuring durability and traceability of processes.. Implement key operational features, including multi-channel pricing, inventory synchronization, and order processing.. Create real-time dashboards and monitoring solutions to enhance visibility and system observability.. Participate in code reviews, mentor engineers, and continuously improve performance, reliability, and code quality.. . 7+ years of experience building and maintaining production-grade web applications.. Strong background in statically-typed programming languages such as Rust, Go, TypeScript, C#, or Java.. Hands-on experience with React or similar modern frontend frameworks.. Deep understanding of async programming, concurrency models, and distributed system design.. Solid command of SQL and relational schema design, ideally using PostgreSQL.. Proven experience developing RESTful APIs and working in event-driven architectures.. Excellent debugging, communication, and problem-solving skills.. . Nice to have:. Experience with e-commerce APIs (Amazon SP-API, Shopify).. Familiarity with event-driven workflows, backpressure management, and idempotency.. Exposure to GCP, Kubernetes, or container orchestration.. Understanding of durable state management and crash recovery. Company Location: Portugal.