He had studied law at the State University of Moldova and upon graduation he got hired at the municipal prosecution office in Chisinau, the capital, first as a deputy to the chief prosecutor, then as a prosecutor, and later as a senior prosecutor employed in the Section for General Surveillance. He didn’t stay long in the capital and accepted a prosecutor’s job in the Gagauzian autonomy. In 2001 though Mr. Stoianoglo returned to Chisinau as a deputy of the prosecutor-general. The government gave his family a four-room apartment which the prosecutor privatized two years later.

In 2007, his mandate ended and Alexandr Stoianoglo withdrew from public life to work in his own law office. Two years later the succeeded in the parliamentary election as part of the Democratic Party (PDM) candidate list and occupied the seat of deputy speaker. After the anticipated elections in November 2010 he maintained a place in the legislative body on behalf of the same faction.

He didn’t run for a new mandate in the 2014 elections and in 2015 he competed for the post of governor of the Gagauzian autonomy. There he captured only 3,174 votes (4.98%) and emerged the sixth among ten candidates. For four years he acted as a consultant and expert at the Crisis Management Initiative, a Finnish conflict resolution and mediation organization.

In 2019 Alexandr Stoianoglo competed for the post of Moldova’s prosecutor-general and the High Council of Prosecutors selected him as the winning candidate. President Igor Dodon approved him in office by an executive decree. Stoianoglo’s election to the top prosecuting job was preceded by a public scandal around.

In summer 2019 the Socialists and ACUM bloc (Action and Solidarity Party & Dignity and Truth Platform) joined forces to seize power from the Democrats and then Prosecutor-General Eduard Harunjen quit the post in response to an investigation (Ministry of Interceptions) published by RISE Moldova about the authorities’ tapping operations on civil society leaders, opposition figures, and journalists.

A new public contest was held. At first, a Justice Ministry panel seeds off most of 20 candidates and left only four names in the shortlist, including Stoianoglo. The High Council of Prosecutors was expected to interview the four finalists but criticism mounted around the evaluation methods. Then Justice Minister Olesea Stamate announced that the procedure was corrupted and the contest would be canceled.

Meanwhile the government led by Maia Sandu, an ACUM leader, assumed full responsibility for the appointment of a prosecutor-general and asked the Parliament to support a bill that would let the prime minister craft the shortlist. Instead, the Socialists - backed by Democrats - filed for a no-confidence motion and sacked the government. The new justice minister, Fadei Nagacevschi, returned to the four-name shortlist and this way Mr. Stoianoglo took over as the country’s top prosecutor.

On the evening of 5 October 2021, a few months after the Party of Action and Solidarity (PAS) returned to power, Alexandr Stoianoglo was detained right at his desk at the General Prosecutor’s Office and investigated for abuse of office, passive corruption, exceeding his official duties, and false statements.

This happened after, on the same day, the Superior Council of Prosecutors (CSP) examined a complaint submitted by PAS MP Lilian Carp, who was also the chairman of the Parliamentary Committee for National Security, Defense, and Public Order (CSNAOP). In his complaint, Carp claimed that during the period when Stoianoglo was an MP and chair of the CSNAOP, he had signed the report for amending the Law on Preventing and Combating Money Laundering and Terrorism Financing. Following this amendment, which was adopted by Parliament, the commission of money laundering crimes was facilitated.

Carp also requested an investigation into the fact that several companies in Ukraine, previously owned by businessman Veaceslav Platon — who had been definitively sentenced in 2018 to 18 years in prison for fraud and money laundering — were registered under the name of Stoianoglo’s wife. Carp further alleged that Stoianoglo “organized and directed the actions of the case prosecutor who dropped the charges against Platon,” which resulted in the businessman’s release and subsequent departure from the Republic of Moldova.

At that time, the CSP appointed a prosecutor to examine Carp’s claims, and shortly thereafter, Stoianoglo was detained.

Later, Stoianoglo was suspended from his position as Prosecutor General, and two years later, in September 2023, he was dismissed.

At the presidential elections of 20 October 2024, Alexandr Stoianoglo ran as the candidate of the Party of Socialists of the Republic of Moldova (PSRM), led by Igor Dodon. Most of the funding for his electoral campaign also came from the Socialists.

Nevertheless, Stoianoglo was promoted as “the people’s candidate for the presidency of the Republic of Moldova.” In the first round, the former prosecutor obtained 401,215 votes, or 25.95%, placing second after Maia Sandu. On November 3, 2024, in the second round of the presidential elections, Alexandr Stoianoglo received 750,430 votes, or 44.65% of the total.

Stoianoglo remained active in politics, and at the beginning of 2025, his team, together with three political parties — the National Alternative Movement Party (led by Ion Ceban), the Party of Development and Consolidation of Moldova (Ion Chicu), and the Common Action Party - Civic Congress (Mark Tkaciuk) — formed the Political Bloc “Alternativa”.

According to its founders, this political project aims “to build a strong alternative based on professionalism, responsibility, and concrete actions for the development and modernization of the Republic of Moldova”.

At the general parliamentary elections held on 28 September 2025, Stoianoglo was placed second on the electoral list of the Alternativa Bloc, as an independent candidate.