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Senior React Dev

Full-time, Copenhagen
Monthly salary:



To be negotiated

Our platform is using top-notch technology to digitize and optimize parcel distribution. We are looking for a senior React/React Native developer to join our strong team.

View more about DROPBOY.IO


full-stack developerReactreact nativeredux

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We are looking for a highly qualified React/React Native developer, to join our small team of skilled devs, and together take Dropboy to the next level.

We believe in having a small, super effective squad of top level developers who can deliver tasks end-to-end across all platform, without waiting for dependencies or bureaucracy. We believe in proving our points by code & example rather than inefficient languages like EN || DA.
We don't talk, we code.

See our stack on StackShare.


  • You know what it takes to be a good developer

The type of problems we are solving

  • Route optimization
  • Fleet management, including maps and geolocations
  • Building private and public APIs
  • Working with large sets of data and making stuff scale
  • Bugs
  • Coffee


  • At least 7 years coding experience
  • At least 3 years experience with React, Redux, NodeJS and MongoDB
  • At least 1 year experience with React Native
  • Ruthless problem solver
  • Independent, but a team player


When applying, please explain how would you solve the following issue:

RN app, using redux-persist. You have the following reducer:

const rootReducer = combineReducers({
   geolocation: geolocationReducer,
   trips: tripsReduce,
   services: servicesReducer

The app seem to respond very slowly when opening the trips list view.

After debugging you realize the trips collection is humongous. Every time you navigate to the trips list view it only updates one flag within this collection, the rest stays intact. This single update seems to take way too long.

How do you speed it up?

More info

We are based at The Camp, with paid lunch, free coffee, tennis & foosball tables, annual parties, and more.

We are reviewing applications as they come until we find a match. If you are interested - apply asap.

Perks & Benefits

Free lunch: Enjoy a free catered lunch with your colleagues, every day
Flexible work hours and vacation: Morning person or night owl, this job is for you
Free coffee / tea: Get your caffeine fix for free
Located near public transit: Easy access and treehugger friendly workplace
Social gatherings and games: Hangout with your colleagues
Equity package offer: Want to be a partner? Look no further
Maternity / paternity leave: Kids are the future, go spend time with them
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