Alex Steinberg

Products:

1) React native mobile app (iOS / android) for managing and controlling Hoval products (heating / cooling plants, ventilation systems, solar panels) remotely targeting base market customers (home and small businesses). The app allows users to

- control their devices remotely

- see statistics for their devices (e.g. heat or energy production)

- schedule maintenance work

2) React / Nextjs web app for service technicians that allows remote access to customer plants

Technology:

1) We revamped the existing desktop first IoT app written in SAPUI5 to a brand new mobile only app for iOS / android written in React Native.

2) We rebuilt the existing service technician app using react 19 and Next 15 using server components.

Both apps are written in TypeScript and connect with a REST API to a Java backend (also maintained by us) that communicates with customer plants via Azure cloud infrastructure resources.

Own Contributions:

Work in a small team as the frontend lead. In the first months I focussed on introducing best practices / coding rules for the RN project and developing a robust framework for the app.

This includes

- introduction of code linting (eslint) and integration into the development / build process

- conceptualisation and implementation of a robust but achievable testing strategy (unit tests of _all_ custom utility functions with jest, component tests with react testing library for atoms, e2e tests with detox, to be implemented at the end / after MVP stage)

- introduction of story book stories for atoms and molecules (i.e. 80% of reused / reusable components)

- conceptualisation and implementation of a global state management solution, including

- introduction of react query for conveniently handling server / async state

- introduction of valtio for handling remaining synchronous state with a light weight and easy to use solution

Project lead for the service technician app.

QA Lead to introduce automated e2e testing to the projects.

Migration of the webshop of a big German clothing brand from legacy technology to React for frontend and a node backend.

One of the biggest challenges was the integration of the legacy backend / infrastructure with the modernized app, as well as maintenance of / improvements to custom solutions e.g. for routing.

Development of Biogen's Backoffice Platform for event management. Development of microservices deployed as AWS lambda functions. Tech stack includes typescript / react / graphql / nestjs / MongoDB / MUI / valtio.

Work took place in a small highly motivated agile team (3 devs) which was very professionally managed. As a consequence each dev was able to influence the decisions taken in the project. I learned a lot here, both technologically and organisationally.