"This is money reserved for art, so it's not in competition with schools or anything else," she told the Telegraph. "This is money which has been budgeted for artworks within the project from the very beginning."
If the project goes ahead, the £500,000 will be placed in a fund managed by the Eternal Employment Foundation, with the return on investment used to pay the salary.
When the employee has punched in at his or her two-room workplace on the station platform, a strong fluorescent light will light up to inform passers-by that they are at work.
The employee can then decide whether to 'work' in a room in the station which is visible to the public, in a next-door private room, or whether to leave and spend the day elsewhere.
If they resign, retire, or die, they will be replaced.
"The employee may come to suffer from severe “boreout” (stress caused by under- stimulation), may invent his/her own projects or creative ventures, or may simply embrace a state of perpetual leisure," the artists told The Telegraph.
They accompanied their bid with a mock-up job advert in the format used by Sweden's state employment agency, including a surreal job description written by Gothenburg poet Lina Ekdahl.
"Bureaucratic and financial systems are part of our palette as artists," the artists said.
The artists see the work as a reflection on the arguments made by the French economist Thomas Piketty in his work Capital in the Twenty-First Century.
"The endless duration of this employment is feasible because money pays better than work," they wrote in their proposal.
"As long as we live in a society where the return on capital is substantially higher than the average increase in wages, Eternal Employment is kept afloat."
Since the project received international attention with an article in the Washington Post last week, Mrs Mossum said the organisers had received nearly 100 applications from all over world.
But their letters have been sent in vain. Due of the timing of the West Link train project, the application process will not formally open until 2025 at the earliest.
The Foundation rather than the artists is responsible for developing the recruitment procedures.
Sweden's public art body has sparked outrage for commissioning an art work which will see £500,000 of public money used to hire an employee to do whatever they like forever, so long as they punch in and out on a time clock each day.
Eternal Employment, by artist duo Simon Goldin and Jakob Senneby, won the competition to supply a public artwork for Gothenburg's new Korsvagen train station.
"The position holds no duties or responsibilities, other than that it should be carried out at Korsvagen. Whatever the employee choses to do constitutes the work," they wrote in their proposal.
The position's lucky holder will be paid 21,600 kronor (£1,900) a month, with the salary for the role increasing at an average of 3.2 percent annually over the next 120 years.
Lars Hjälmered, a Gothenburg MP for the centre-right Moderate Party told the Daily Telegraph that the artwork could be "devastating for the tax morality of society".
"Society can't fulfil basic requirements: we have a lack of police, more to do to improve school results, and looking at these challenges, I think it is absurd to have artworks like this," he said.
But Lotta Mossum, the curator responsible for the work at Public Art Agency Sweden, said that the budget for Eternal Employment was no different from that allotted to the other three artworks commissioned for the train line.