Senior Backend Software Engineer

The company is a growing international technology business expanding its engineering presence in Kraków. It develops robust data infrastructure used by organizations operating in complex, high-stakes environments, focusing on systems designed for demanding workloads where speed, availability, and accuracy are critical.

• At least five years of professional experience building production software with Node.js and TypeScript.
• Strong practical knowledge of AWS services such as Lambda, ECS, S3, or RDS.
• Solid understanding of distributed system design, scalability, and event-driven architecture.
• Experience with modern automated testing tools such as Jest, Vitest, or Playwright.
• Confidence to independently investigate unfamiliar problems and progress work.
• Clear English communication skills.
• Comfortable working in a dynamic environment with evolving priorities and products.

Nice to have:

• Experience with Go development.
• Experience with distributed platforms or messaging-based systems.
• Experience with large language models or contemporary AI development tools.
• Experience with React.
• Familiarity with relational and non-relational databases.
• Experience with Docker and Kubernetes.
• Knowledge of CI/CD pipelines and modern delivery practices.

• Design and deliver scalable backend services with Node.js and TypeScript.
• Build APIs and asynchronous, event-driven workflows in AWS.
• Engineer reliable systems supporting high-volume workloads.
• Own features from technical discovery through deployment and improvement.
• Establish architecture and engineering practices for a new product.
• Partner with product specialists and engineers across disciplines.
• Support developers via mentoring, reviews, and knowledge sharing.
• Strengthen standards around testing, security, maintainability, and operational reliability.
• Adapt constructively as requirements evolve and new challenges emerge.

The controller of your personal data is [FULL COMPANY NAME], [REGISTERED OFFICE ADDRESS] (hereinafter: the “Controller”). We process your data for the purpose of recruitment on the basis of the Labour Code, your consent, and our legitimate interest with specifics detailed in the privacy notice. Data availability is mandatory only for required fields; other data is voluntary. Data is stored until the recruitment ends or consent withdrawal, but no longer than 24 months. You have rights to access, rectify, erase, restrict, object, and complain to the data protection authority. Consent can be withdrawn anytime without affecting prior processing. The data is not subject to profiling.