Mobile Engineering Intern (Remote)

Who we are:

Our main product is a payroll and timekeeping app for hourly workforces, sold by subscription and supported from Madrid. Founded in 2014, the business writes the billing, metering and customer portal software that small water and electric utilities run on. We keep recurring meetings to Tuesdays and Thursdays where we can.

About the role:

This is a coding internship, not a design or testing role. You should be comfortable writing and debugging code on your own for a few hours at a time. Remote position. Most of the team is in Madrid, but nobody is required to come in. You will write a lot of updates, so clear written English is important.

Responsibilities:

• Track your tasks in Jira and update ticket status before standup.
• Join a weekly demo where you show what you built over screen share.
• Fix crashes reported in Firebase Crashlytics, starting with the most frequent ones.
• Test builds on real Android phones and the iOS simulator before each release.
• Build new app screens in Flutter or React Native from Figma designs.
• Write widget and unit tests for new features.
• Manage app state with Provider, Riverpod, Bloc or Redux, following the existing pattern.

What we're looking for:

• Based in Spain for the duration of the internship.
• Currently enrolled in a bachelor's or master's degree, graduating 2028.
• Available for the full internship period.
• Some exposure to Firebase (Auth, Firestore or Cloud Messaging)
• Own laptop that can run an Android emulator, and a stable internet connection.
• Working knowledge of Dart and Flutter, or JavaScript and React Native.

Duration: 4 months

Start date: Jan 2027

Stipend: €1,100 - €1,400 monthly

What we offer:

• Possibility of a full-time offer.
• Online learning budget.
• Paid public holidays.
• Letter of recommendation.
• Company laptop.
• Flexible hours.

We may close this posting early once we have enough applications.

Duration: 4 months. Start: Jan 2027.

Demo job created on 11jobs for testing and demonstrations. It is not an actual opening at Costa Software S.L..