Mid–Senior Backend Developer

.js 👨‍💻**Mid–Senior Backend Developer ** 🌏Location: Poland / Hungary / Czechia / Portugal 📕Responsibilities • Design and build backend services in** Node.js **and** TypeScript **(strict mode) powering our iOS app ecosystem. • Architect clean, efficient REST APIs optimized for mobile performance and reliability. • Model and manage relational data using PostgreSQL. • Develop and maintain integrations with AWS (Lambda, S3, SNS, SQS, and other core services). • Implement and own CI/CD pipelines with GitHub Actions and ArgoCD. • Build and deploy containerized systems with Docker and Kubernetes. • Collaborate daily with iOS and product engineers to ship user-facing features with precision. • Take full ownership — from infrastructure and reliability to performance and monitoring. 📒Requirements • 4+ years of experience developing backend systems in **Node.js** and **TypeScript** — must. • Proven expertise designing and scaling **REST APIs**. • Strong knowledge of **PostgreSQL**, including schema design and performance tuning. • **Experience with AWS Lambda, S3, SNS, and SQS.** • Solid understanding of Docker, Kubernetes, and microservice orchestration. • Hands-on experience with CI/CD automation (GitHub Actions, ArgoCD). • Excellent communication skills and a proactive, ownership-driven mindset. • Comfortable with constant change, hard deadlines, and rapid experimentation. 📚Nice to Have • Experience with Magento GraphQL API • Familiarity with monitoring and observability tools (Datadog, Prometheus, Grafana). • Background in backend development for mobile-first products or app ecosystems. • Exposure to analytics, marketing automation, or personalization systems. 📝