Leo Backmann
DERUEN
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DERUEN

Case study

A planning platform for an organisation with more than 70 members

Meetings, duties, events and reports – planned, built and run by me. In daily use since April 2026.

70+
members use it daily
since 04/2026
in use
3 ways
browser · Android · iPhone
2,000+
automated tests

Starting point

Plans lived in spreadsheets, agreements in chats, changes did not reach everyone. Who was on duty, who was away and who had not served for a long time was usually known to one person only – who had to ask around every week.

What was needed was not another list but a tool that shows members of every age their own plan and takes the routine off those in charge.

Everyone sees what is coming up for them

The home screen is a timeline: today, tomorrow, the next 14 days. Your own duties light up, everything else stays quietly in the background.

  • Own tasks right inside the relevant meeting
  • Absences and events in the same stream
  • Push reminders on Android, iPhone and in the browser

Run events live

On a tablet the agenda runs with a time limit for each item. The expected end is always visible – and afterwards a review shows where time was lost.

  • One person keeps time, others follow along
  • Colour and words for “almost over” and “overrun”
  • The review only for those who need it

Fair duty planning

The monthly plan on a laptop: every choice shows at once who is away on that very day, who has not served for a long time and who is already booked. A slip? Just undo it.

Interface recreated, names and content changed – features as in the original.

All features at a glance

Built step by step from the organisation’s real everyday life.

Planning

“My week”

Everyone sees at a glance what is coming up for them in the next 14 days – own duties right inside the meeting.

A plan that prepares itself

Next month’s plan appears overnight as a draft, in fair order, large events left out; publishing sends one message per person, automatically 7 days ahead if wished.

Fair duties

Absences checked against the real date, “not for a long time” and “already booked” in colour and words; “Fill empty slots” in order.

Events

Live agenda

Items with time limits, one person keeps time, others follow; a review with the course of the deviation.

Guests and speakers

A directory with history: who came when with which topic – the basis for the next invitation.

Board and administration

Tasks and agenda

Agenda with an outcome per item, an item becomes a task with one tap; recurring duties (e.g. the audit of accounts) appear by themselves; print as PDF.

Reports without manual work

Entering attendance appears on the home screen an hour before the start; “did not take place” does not count as zero; the whole year in one table.

Volunteer hours

Time entered after each outing with a wheel; at the end of the month the report assembles itself; entries visible offline.

Trust and data protection

Permissions that really hold

Members see only name, group and role; phone numbers only those in charge. The server never sends protected data – it is not just hidden. Personal fields encrypted.

Nothing gets lost

Undo right after a deletion, a log with before and after, “restore” even a week later – through the same rules as any change.

Operations

Everywhere

Browser, Android app with updates without reinstalling, iPhone as a web app on the home screen; push notifications on all three.

German, Russian, English

Interface and notifications in three languages.

Run safely

Servers in Germany, encrypted backups, every change passes automated checks before release.

How I ensure quality

2,000+

automated tests check the server on every change.

Pixel-exact

screens compared before and after every change to the interface.

Real device

automated runs on a real Android phone.

A similar project?

Briefly describe how you work – you get a free first assessment within 2 working days.

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