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A friendly monolith for managing "Jugend musiziert" contests ♫
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Jumubase is a tool for organizers of Germany's largest youth music competition – Jugend musiziert, or "Jumu" in short. The software powers, a competition hub for German schools across Europe.

The application serves two main audiences:

  • Jumu participants and their families, friends and teachers; they can sign up for a contest, edit their information, and check schedules and results without a user account.
  • Jumu organizers on both local and global level, who can manage contest data, enter results and print contest-related material. The permissions for this are granted via personal user accounts.

Jumubase also exposes some public data, such as timetables and results, via a JSON API that serves mobile clients for Android and iOS.

Setup instructions

  1. Clone this codebase
  2. Install PostgreSQL, e.g. through the provided docker-compose.yml file or
  3. Install dependencies with mix deps.get
  4. Install JS dependencies with cd assets && npm install
  5. Create, migrate and seed the local database with mix ecto.setup
  6. Start Phoenix endpoint with mix phx.server

Then, point your browser to localhost:4000.

Release instructions

Ensure the following environment variables are made available to the app:

  • DATABASE_URL – Set automatically e.g. on Heroku when provisioning a database.
  • POOL_SIZE – Depends on how many database connections are allowed by the plan. Leave some room for occasional one-off mix tasks such as migrations.
  • SECRET_KEY_BASE – Can be generated using mix phx.gen.secret.
  • PHAUXTH_TOKEN_SALT – Can be generated in IEx using Phauxth.Config.gen_token_salt.


Domain vocabulary

Many schemas / data structs in this app are inextricably linked with the "Jugend musiziert" competition. The following list serves as a brief explanation to those unfamiliar with the domain:

A user of the software, identified by their email and password.

An institution, typically a school, that can host contests.

A location where performances take place. Every host has at least one, but often several stages.

A single- or multi-day event during which performances take place. Besides its associated host, it includes a season (= competition year) and a round.

A set of constraints for participating in a contest. Each category is designed either for solo or ensemble performances and mandates what pieces can be performed, as well as a min/max duration that depends on the performance's age group.

Contest category
A manifestation of a category when offered within a particular contest. This schema exists to hold additional constraints: Some contests might offer a category only for certain age groups, or not at all.

A musical entry taking place within a contest category, at a given time and venue. It is associated with an age group calculated from the birth dates of the soloist or ensemblists (but not accompanists).

A single participant's contribution to a performance. It holds the participant's instrument and role (i.e. soloist, ensemblist or accompanist, the first two being mutually exclusive). It also stores its own age group, which for accompanists can differ from the performance's age group. Each appearance is awarded points by the jury, and a certificate is given to its participant afterwards.

A person appearing in one or more performances within a contest.

A piece of music presented during a performance. It holds information on the composer or original artist, as well as a musical epoch.


Some Jumu-related data (such as rounds, roles, genres, and category types) is unlikely to change much over time and therefore hard-coded into the JumuParams module. Parameters that are likely to change, or not meant for the public eye, are stored as environment variables instead.


Phauxth is used for user authentication. Users can be associated with one or several hosts, typically for the reason of being employed there and acting as local organizers. They can only manipulate resources "belonging" to those hosts.

Apart from local organizers with their host-based access rights, there are global organizers who organize the 2nd round hosted somewhere abroad in round-robin fashion, inspectors who may access certain data for statistical purposes, and admin users with full privileges.


Jumubase is published under the MIT License.

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