Senior Frontend Developer

applications from outside of Poland are deleted. Especially FAKE ones. Company Description At Battronics, is a data analytics company for batteries and raw materials with big data collection. Role Description full-time + remote from Home-office in Poland. Front-end engineer, data visualisation (mid to senior) Builds the client-facing dashboards of a data platform for critical raw-material and battery supply chains: interactive charts, maps and comparison views over a REST API, for three user groups from analysts to executives. Must have 4+ years building one-page applications in TypeScript with React or VueData visualisation for analytical products: time series, balances, rankings, flow or network graphs, with a library such as ECharts, Plotly, Vega-Lite, D3 or similarInteractive maps with e.g. MapLibre, Leaflet or deck.glConsuming REST APIs from OpenAPI specifications, including pagination, filtering and OIDC/JWT authenticationTesting and static typing as routine: unit and component tests, strict TypeScript, linting in CIDocker and CI/CD pipelines on GitLab or GitHubTurning UX wireframes and domain-expert input into a working product with little supervision Nice to have Accessibility (WCAG) and responsive layoutsSQL and PostGIS basicsGrafana dashboardsNode or Python backend-for-frontend experienceInterest in raw materials, batteries or energy markets Valid work permit and living in Poland must already exist!