PS Mitra Kukar In December 2014, Septian signed a contract with
Mitra Kukar. He made his debut on 5 April 2015 after replacing
Jajang Mulyana in the 73rd minute, which ended 1–0 defeat against
Persebaya Surabaya at
Gelora Bung Tomo Stadium. In next match, he scored his first goal in the 35th minute against
Gresik United. In 2015 season, he only played 2 times and scored one goal.
2016 season On 14 May 2016, he scored his first goal of the
2016 season, scoring in a 1–4 away win over
PS TNI at the
Siliwangi Stadium. On 10 June, he scored equalizer in a 3–2 home win over rival
Pusamania Borneo. In 2016 season, he had a good season in his first club with 29 appearances and scored five goals.
2017 season Septian scored his first goal of the new season on 15 April 2017, opening the scoring from header in a 2–1 lose with
South Kalimantan club
Barito Putera. On 28 April, he give assists an equalizer goal by
Marclei Santos in Mitra Kukar's 2–2 draw over
Madura United. On 3 May, Septian scored his second league goal of the season, scoring in the 55th minute and give another assists to
Anindito Wahyu in Mitra Kukar's 3–2 home win over
Persela Lamongan. On 15 June, he assisted a further two goals in Kukar's 3–1 victory over
Persegres Gresik United. On 7 October, he was involved in Mitra Kukar's 2–4 away win over Persegres Gresik United, scoring in the 51st minute. He was subbed off in the 65th minute, for suffering an injury which would saw him recover, he said that this injury was already present before the
national team training camp and against
Sriwijaya. He then scored a free kick against
Persiba Balikpapan on 10 November in the game week 34 of Liga 1, in a 3–2 lose at
Batakan Stadium. Through his goal, he was paired to
Portuguese international Cristiano Ronaldo, because of similar
knuckleball free kick technique, as well as being the best goal of the
2017 Liga 1 season. He won the award when it was announced at the Liga 1 Awarding Night event at Mulia Hotel,
Senayan,
Jakarta on 22 December. He beat goal nominations from
Zulham Zamrun,
Samsul Arif,
Terens Puhiri, and
Irfan Bachdim. Through the club official
Instagram account, it was announced he would then extended his stay at the club until end the 2018 season. He contributed with 19 league appearances, scored 4 goals and 6 assists during his 2017 season.
2018 season Septian scored his first goal of the
2018 season on 13 April 2018, in a home game against
Madura United. The game ended in a 3–1 victory for Mitra Kukar. He added his second goals of the season eight days later with one goal against
Persipura Jayapura in a 2–1 away lose. He continued his good form with the opening goal in a 3–1 victory over
Bali United on 11 May at the
Aji Imbut Stadium. He scored in a 3–0 home win against
Sriwijaya at Aji Imbut Stadium on 18 July. He continued his good form in October with give assists an opening goal by
Aldino Herdianto in a 1–3 away win over
PSMS Medan on 23 October, whilst also scored who made it 2–0 in the 34th minute. And continued scored his second goal in October in a 2–0 home win against
PSIS Semarang five days later. Through his personal
Instagram account, Septian will officially not be with Mitra Kukar for next season, Septian is rumored to be with several clubs, namely Barito Putera and PSIS Semarang. Mitra Kukar this season must be relegated to
Liga 2 after collecting 39 points from 34 matches.
Naga Mekes closed the 2018 Liga 1 by being in 16th place in the league standings. Meanwhile, Septian could not contribute much to Mitra Kukar this season due to the
Indonesian national team agenda. He contributed 21 league appearances and scored 6 goals.
PSIS Semarang On 21 January 2019,
PSIS Semarang announced a deal for Septian to join Indonesian
Liga 1 club PSIS on a free transfer. On 5 February 2019, Septian made his first appearance in the Round of 32
2018–19 Piala Indonesia in a 2–0 home win against
Liga 3 club
Persibat Batang. He also scored his first goal for PSIS, where he scored in the 32nd minutes. Septian made his first
Liga 1 appearance on 16 May 2019, coming on as a starter in a 1–2 lost against
Kalteng Putra. He also scored his first league goal for PSIS, where he scored in the 20th minute. On 30 May 2019, Septian scored equalizer in a 1–1 draw over
Persebaya Surabaya. In September 2019, with a market value of 3.6 billion rupiah, he's the most expensive player at
PSIS Semarang. Septian give assists a winning goal by
Heru Setyawan in PSIS's 0–1 away win over
PSM Makassar on 11 September 2019. Septian scored his third goal for the club in a 2–1 lose against
Persija Jakarta four days later. Septian give another assists an opening goal by
Bruno Silva in PSIS's 2–2 draw over
Borneo on 26 October 2019. He continued his good form in November with scored in a 3–0 home win over
PSS Sleman on 2 November 2019, the three points keep PSIS away from the relegation zone with 28 points from 25 matches. He also continued his good form in December with give assists an opening goal by
Hari Nur Yulianto, whilst also scored a brace in a 5–1 big win against
Arema on 8 December 2019. He made 28 league appearances for PSIS Semarang during the 2019 season and scored six goals. On 1 March 2020, he started his match in the
2020 Liga 1 season for PSIS, playing as a starter in a 2–0 lose over
Persipura Jayapura. Septian only played 3 times for the club because the league was officially discontinued due to the
COVID-19 pandemic. Septian scored his first goal of the
2021–22 season on 15 October 2021, also give two assists in an 3–0 home win game against
Persik Kediri. On 3 December, he scored the opening goal when the game was only in its 6th minute, scoring a free-kick in a 1–2 lose over PSS Sleman. By the end of the 2021–22 season, he was a starter in all of the club's Liga 1 fixtures, as PSIS finished in seventh place on the Liga 1 table. Septian made his comeback to the squad, having previously been sidelined for a while due to a
knee injury. In the match against
Bhayangkara on 9 January 2023, Septian made his first appearance of the
2022–23 season, coming on as a substitute in the 72nd minute for
Ridho Syuhada. Septian scored his first goal of the 2022–23 season on 4 February, opening the scoring with his acceleration past four opposing players in an away game against Persik Kediri. The game ended in a 1–2 victory for PSIS Semarang. On 17 February, Septian was a starter in
Central Java Derby against
Persis Solo at Jatidiri Stadium, also scored a penalty in the 79th minute in a 1–1 draw. On 1 March, he scored the opening goal, scoring a header in the 11th minute and give assists to
Rizky Dwi Pangestu in PSIS's 3–2 lose over
Bhayangkara. He added his fourth goals of the season on 2 April with one goal against PSS Sleman in a 5–2 home win at Jatidiri. On 9 June 2025, Septian officially left
PSIS Semarang. ==International career==