Five Days Of AI-Assisted Coding: Inside My Retirement Countdown

🔍 Read the full analysis: Five Days Of AI-Assisted Coding: Inside My Retirement Countdown on ThorstenMeyerAI.com

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Thorsten Meyer says he built and published Altersteilzeit, a web app for people counting down to partial retirement in Germany, in five days with help from the AI coding agent Claude Opus 5.5. The project grew from a request for a one-minute animated film into a collection of countdown tools, a narrated film and games, while Meyer directed the work and approved releases.

In an account published October 13 on ThorstenMeyerAI.com, Meyer dates the project’s start to Monday, September 28, and its public release to Friday, October 2, 2026. He says all 24 commits were co-authored by the coding agent. The published description does not provide an independent technical audit or usage figures.

The app calculates remaining working days from a user’s dates and selected work-and-release model. Its count can account for weekdays, state public holidays and entered leave. Meyer describes additional features including a daily countdown, milestones, a bridge-day finder, calendar exports, a printable calendar, badges and a team countdown.

The project also includes a short film about the two phases of partial retirement and a set of 19 3D games, according to Meyer. He says the app supports seven languages and five German dialects, with narration and sound effects. His account describes a development process in which the agent planned, coded, tested and logged work, while he chose the creative direction, reviewed outputs and approved deployment.

Where the Human Work Remained

Meyer’s account offers a specific example of how an AI coding agent was used in a small software project: not simply to produce code, but to contribute across implementation, testing, localization and release tasks. The reported pace is striking, but it is a single developer’s account, not a controlled comparison showing how long the same app would take without an agent.

The division of responsibility is central to the story. Meyer says he set the tone and concept, selected voices and dialects, made decisions about the legal pages, and listened to the finished audio before approving it. Those details show that a fast build still relied on human judgment and sign-off, particularly for creative choices and public release.

For users, the app’s stated privacy design is also relevant: Meyer says it has no accounts, cookies or tracking and performs calculations in the browser. That description comes from the developer; the account does not include an outside privacy review.

A Countdown for German Partial Retirement

Altersteilzeit is a German arrangement that lets eligible workers move toward retirement through reduced working time. Meyer describes the block model, in which a person first works an active phase and then spends an equal-length passive phase away from work. A 4:4 model, for example, pairs four years of active work with four years off.

The app is designed around that calendar. Users enter a date marking the start of either phase and choose a model from 1:1 to 5:5; the app calculates the other date, according to Meyer. He says calendar information is stored in a shared link after the “#” symbol, which browsers do not send to the server, and that the app’s calculations run locally.

Meyer’s timeline describes a rapid expansion from the original film request. On the first day, he says, the work included date entry, working-day calculations and early game prototypes. The daily view and additional languages followed, then more games, mobile scrolling fixes, narration and dialect support. The account says the project had 16 versions over the five days.

“The interesting part is not how much an AI agent can build, but what was still left for me to do.”

— Thorsten Meyer, describing the project

What the Account Does Not Verify

The details of development, performance and privacy come from Meyer’s own account. It does not include independent testing of the app, a security or privacy assessment, or a breakdown of how much time the agent and Meyer each spent. The reported 24 commits and five-day schedule do not by themselves establish the app’s reliability or the amount of human review behind every feature.

It is also unclear how many people have used the public app, whether users have reported problems, or whether all listed features were available and functioning across devices at publication. Meyer mentions a scrolling hotfix for iPhone pages, but provides no broader compatibility results. The source account does not include a link to an independent evaluation of the coding agent or the app.

The App’s Ongoing Use and Review

The account does not announce a future release date, planned feature or formal evaluation. The next practical developments would be any updates Meyer makes to Altersteilzeit and any user feedback or independent checks of its calculations, privacy claims and device support. Until such information is published, the five-day build and the app’s described capabilities remain claims reported by its developer.

Readers considering the countdown should check that the app’s calendar settings match their own circumstances, including the relevant German state holidays and entered leave. Meyer’s description explains how the calculator is intended to work, but the source material does not establish that its results have been reviewed by a legal or employment specialist.

Key Questions

What is Altersteilzeit?

Altersteilzeit is a German partial-retirement arrangement. In the block model described by Meyer, a worker completes an active phase followed by an equal-length passive phase.

What did the app include at launch?

Meyer says it included a working-day countdown, milestones, calendar tools, a short narrated film and 19 3D games, along with language and German dialect options.

How much of the work did the AI agent do?

Meyer says Claude Opus 5.5 helped with coding, tests, localization, audio production and deployment. He says he supplied direction, made creative and product decisions, reviewed the work and approved releases. The account does not quantify each party’s time or contribution.

Does the source independently verify the app’s privacy claims?

No independent review is provided. Meyer says the app has no accounts, cookies or tracking and runs calculations in the browser, but those statements are attributed to the developer.

Source: ThorstenMeyerAI.com