Career
Alströmer began his career as an extraordinary ordinary notary in the Svea Court of Appeal in 1903 and in the Göta Court of Appeal in the same year. He did his clerkship from 1903 to 1906. He became an assistant at the Ministry of Agriculture on 15 February 1906. Later that year, in June, he joined the Swedish Forest Service (Domänstyrelsen), and by 1 December 1906, he was appointed valet de chambre. He was an acting legal clerk (domänfiskal) at the Swedish Forest Service in 1907. On 23 February 1908, he became second secretary at the Ministry for Foreign Affairs, and by 31 December 1908, he had advanced to first secretary.
From 17 October 1914 to 31 December 1916, Alströmer served as acting head of the Legal Division at the Ministry for Foreign Affairs. During this period, he also acted as secretary of the Ministry's Admissions Commission (1914–1917) and was appointed chamberlain on 31 December 1914. On 27 December 1916, he became an extraordinary department head at the Ministry.
In the following years, Alströmer took on several diplomatic roles. He served as acting legation secretary in Paris from 18 September 1917 to 23 July 1918, and as first legation secretary in Kristiania (now Oslo) starting 22 July 1918. Shortly thereafter, he returned to Paris as acting legation secretary from 26 August to 6 December 1918, before moving to London as acting legation secretary on 10 December 1918. From 18 December 1918 to 4 November 1919, he served as chargé d'affaires ad interim in London and was awarded the title of legation counsellor on 12 September 1919.
Alströmer represented the Swedish Red Cross at the International Law Association's conference in Portsmouth in 1920. He was also a member of an international committee established to draft proposals for the treatment of prisoners of war (1920–1921) and a delegate at the London conference on the continued publication of the International Catalogue of Scientific Literature in 1920.
On 26 September 1921, Alströmer was appointed resident minister and head of the personnel and administrative department at the Ministry for Foreign Affairs. He subsequently served as consul general in Shanghai and consular judge from 16 December 1921 to 17 March 1922. On 28 June 1922, he became envoy extraordinary and minister plenipotentiary to the Swiss Confederation, and from 27 September 1924, he simultaneously held postings in Vienna and Budapest. In 1923 and 1925, Alströmer was a delegate to the International Red Cross conference in Geneva. He became acting envoy in Bucharest, Athens, and Belgrade in 1925. He was representative of the trade treaty negotiation with Greece in 1926 and with Romania from 1930 to 1931. Alströmer was also representative in negotiations with Greece regarding ship's survey from 1928 to 1929 and clearing agreements in 1932.
