Senior Fullatack Engineer (Java + React)

Connectis_Warszawanofluffjobspublished 08/28/2026
Must-have:TypeScriptJavaScriptJavaReactGitKubernetesCloudFrontendBackendFullstackAISenior
Machine translation — original language: Polish.Show original

Together with our Partner, a leader in the new technologies and network automation industry, we are looking for an experienced specialist to implement projects as a Senior Fullatack Engineer (Java + React).

You will provide services in the Network Cloud project, which involves the development of modern software for the automation, configuration, monitoring, and optimization of servers and networks worldwide. By combining a backend in Java with a frontend in React, you will co-create cloud-native solutions supporting the development of modern mobile networks.

Nice to have: experience in creating software for telecommunications, knowledge of IPv4/IPv6, DNS, BGP, DHCP, Segment Routing and ZTP, knowledge of data visualization libraries (Cytoscape.js, react-chartjs-2, MapLibre), knowledge of Storybook, Lerna or Webpack, knowledge of Ansible or Terraform, knowledge of routing, iptables and CNI in Linux/Kubernetes environments.

✨ WE OFFER:

A new way to apply with the AI Recruiter (AIR) – during the process, you can talk to a virtual recruiter 24/7, without waiting for a phone call. The final decision is always made by the Project Manager. Participation in industry events and technological meetups, enabling the sharing of knowledge and experience. Cooperation implemented in a project model, with settlement based on stages and acceptance protocols of individual deliverables. Support from Connectis regarding administrative and billing matters related to the cooperation. 5000 PLN for referring friends to our projects. Flexible B2B cooperation form. A fast and remote process.

Thank you for all applications. We would like to inform you that we will contact selected persons.

13392/KB

Daily tasks

  • Conducting code review in the area of backend, frontend, and the integration between them, with the preparation of change recommendations.
  • Implementation of tasks based on agreements with R&D project stakeholders located in different countries.
  • Comprehensive implementation of functionalities – from API and data model to the user interface.
  • Development and maintenance of backend services in Java and frontend interfaces in React.
  • Development of a shared UI component library and backend architecture.

Requirements

Minimum 5 years of experience as a Fullstack Developer, including knowledge of Java 21. Readiness for coordination meetings in Warsaw or Krakow (approx. 1x per week). Knowledge of Linux at the user level and proficient use of Git. Practical experience in JavaScript, TypeScript, React and Redux Toolkit. Good knowledge of relational databases, in particular MariaDB. Knowledge of cloud-native environments, in particular Kubernetes. Very good knowledge of Spring/Spring Boot and Hibernate. English language - C1.

Must have: Java, JavaScript, React, Linux, Spring, Kubernetes