Senior Backend Developer

We are looking for a high-impact engineer to architect a brand-new product from the ground up. In this role, you will bypass maintenance of legacy systems to design and develop high-scale, event-driven backend infrastructures. Operating at the intersection of technical rigor and rapid product evolution, you will thrive in an environment of high ambiguity where your architectural decisions define the roadmap. Core Responsibilities Architect and scale mission-critical backend services using Node.js and TypeScript.Design and implement high-performance APIs and sophisticated event-driven architectures on AWS.Engineer resilient, distributed systems capable of managing intensive global workloads.Own feature development end-to-end, navigating the lifecycle from initial design to production deployment.Partner closely with product and cross-functional engineering leads to drive technical innovation.Mentor the engineering squad and champion elite standards in code quality, security, and testing.Adapt and pivot technical strategies as the product scales and new challenges emerge. Technical Requirements 5+ years of hands-on experience deploying Node.js and TypeScript in high-stakes production environments.Advanced proficiency with the AWS ecosystem, including Lambda, ECS, S3, and RDS.Deep expertise in system design, scalability, and modern event-driven paradigms.Experience utilizing modern testing frameworks such as Vitest, Jest, or Playwright to ensure zero-defect deployments.Elite problem-solving skills with the ability to operate autonomously in a fast-moving hub.Professional fluency in English with a track record of driving cross-functional alignment.A high-velocity mindset suited for a dynamic, high-growth engineering culture. Additional Assets Hands-on experience with Go.Background in distributed systems or complex event-driven platforms.Experience integrating LLMs or modern AI tooling into production workflows.Practical knowledge of React or modern frontend frameworks.Deep understanding of SQL/NoSQL database optimization and CI/CD best practices via Docker and Kubernetes. The Offer Competitive compensation aligned with the top-tier Kraków tech market (UoP or B2B options).Flexible hybrid work model based in the heart of Kraków.Radical ownership and the unique opportunity to shape a global product from day one.Collaborative, English-speaking engineering environment within a stable, profitable firm with a long-term vision.