Gieljan is a specialist in the field of flexible employment relationships. He has been particularly interested in this field ever since he started working as a lawyer in 2013. Gieljan therefore knows all the ins and outs of the temporary employment sector and every other form of flexible employment, such as payrolling, secondment, and the facilitation of self-employed workers. Gieljan advises, draws up contracts, and is involved in mergers and acquisitions within the broad flex industry. Gieljan is known for his thorough and practical advice, and for always honouring his agreements.
After travelling the world, Gieljan re-joined Köster in mid-2022. He is registered as a lawyer in the Noord-Holland district.