Code Challenge Services

In additional to running code, and having access to external services, Qualified provides the ability to spin up several services to perform even more accurate testing. This includes running a database like PostgreSQL or MongoDB, or running a key-value service like Redis.

Enabling Services

You can enable one or more services by looking for the Enabled Services section for classic code or project code challenges.

From here, simply check the service you want to use. Some services also let you select the version of the service you want to use.

Performance Concerns

Note that adding a service will increase the time it takes to run the candidate's code. This might not be very much time, but you should only enable services if they are an important part of your testing process. If using a full database isn't critical, consider mocking your data source, or using a lighter-weight service like SQLite.

Using Services

The services provided will usually require a library to access. Most of our languages include the necessary libraries. Databases are set up before every run, so there's no data carried over.

The following includes service-specific connection information.


You can connect to MongoDB using mongodb://localhost. This will provide an empty database to create document stores, insert data, and make queries.


You can connect to PostgreSQL using postgres://[email protected]/postgres, though just postgres:// should work as well.

You can choose between these built-in databases to manipulate:


You can connect to Redis using redis://localhost. This will provide an empty datastore to work with.