Julin was founding owner of Russo-Finnish Whaling Company and significant owner of Turku shipbuilders Åbo Skeppswarf and W:m Crichton & C:o. Julin initiated foundation of the first voluntary fire brigade of Finland and he developed actively the financial sector.

Like his older brother Johan Jakob, he decided to follow his father's steps in pharmaceutical field.

During 1819–1820 Julin studied in professor Johann Trommsdorff's pharmaceutical institute in Erfurt, Prussia where he also learnt analysing minerals.

A major setback took place in the following year, when the pharmacy building was destroyed in the Great Fire of Turku.

In 1830 Julin became the sole owner of his father's cinchona mill which is regarded the oldest pharmaceutical factory of Finland.

He was co-founder and major shareholder in 1856 founded Aura shipping company and 1857 started Österbottniska Ångfartygs Ab.

Julin had a key role in promoting investments at the yard and made deals of ships delivered to the Russian-American Company.

Julin gained a strong foothold in the Turku shipbuilding industry after together with his business partner William Crichton he took over engineering company Cowie & Eriksson.

By help of the Finnish-born Alaskan politicians Arvid Adolf Etholén and Johan Hampus Furuhjelm, the Finnish shipyards, sailors, whale hunters and shipowners got new business opportunities.

[1] While Julin's business was focused on apothecary operations and shipping, he also owned a water mill in Halinen rapids and two small factories, of which one produced soap and candles, and the other one sailcloth.

Julin worked actively to develop banking operations and he became the local agent of Suomen Yhdyspankki in Turku in 1862.