Where brilliant problem solvers are formed

Siswa Kokocoder belajar coding dan competitive programming untuk OSN Informatika

700+

students from 20+ province in Indonesia

60+

reputable coaches

20,000+

coaching and mentoring hours held

90+

OSN medalists

Kokocoder has been trusted by 350+ students from 50+ schools in Indonesia

SMAK 1 BPK Penabur Jakarta

SMA Kolese Kanisius Jakarta

Jakarta Intercultural School

SMANU M.H. Thamrin

Sekolah Pelita Harapan

SMA Al Azhar

SMA Semesta Semarang

SMAK 1 BPK Penabur Bandung

SMAN 4 Denpasar

Ignatius Global School Palembang

SMA Santa Maria Cirebon

SMA Taruna Nusantara

SMA Rajawali Makassar

SMA Kesatuan Bangsa Yogyakarta

SMA Kristen Petra 2 Surabaya

SMA Pradita Dirgantara

SMAN 1 Bogor

SMA Sutomo 1 Medan

SMA Darma Yudha Pekanbaru

SMA Immanuel Pontianak

SMA Kusuma Bangsa Palembang

MAN Insan Cendekia Gowa

SMP Pribadi Depok

SMAK BPK Penabur Gading Serpong

... and many more

Our alumni and coaches study at 23 top universities worldwide

MIT USA
Oxford UK
Harvard USA
NUS Singapore
HKU Hong Kong
NTU Singapore
Cornell USA
Yale USA
UC Berkeley USA
UChicago USA
Sydney Australia
Toronto Canada
ANU Australia
Edinburgh UK
UBC Canada
HKUST Hong Kong
Waterloo Canada
SUTD Singapore
UI Indonesia
UGM Indonesia
ITB Indonesia
ITS Indonesia
BINUS Indonesia

Sorted by QS World University Rankings

Peraih medali emas OSN Informatika 2026 dari Kokocoder

Prestasi terbaru · OSN 2026

25 dari 30 medali OSN Informatika 2026 diraih KC Troops

3 emas, 9 perak, dan 13 perunggu di Olimpiade Sains Nasional bidang Informatika. Kenali 25 siswa Kokocoder yang membawa pulang medali tahun ini.

Lihat para pemenang →

Why Kokocoder?

Professional and experienced coaches

Learn to master on-demand skill in computer science right from the experts. From informatics olympiad medalist to multinational tech-company programmer, we ensure only the best can teach you.

Personalized learning special for you

Never worry about getting left behind or being overwhelmed by the learning pace as we always customize the topic for each session based on your learning progress.

Trusted by many brilliant coders nationwide

More than hundreds students in Indonesia already recognized us as their reliable partner to help them unlock their coding potential and shine as brilliant coders

Get your best coding experiences with Kokocoder

OSN Preparation Class

Sharpen your skill in Competitive Programming and secure your high chance to win the OSN medal

University Preparation Class

Build a strong portfolio for university application and learn computer science fundamentals before first day in college

Computer Science Class

Boost your coding skill and unlock your utmost potential whether you’re new or already familiar with computer science

Establish a strong connection with like-minded individual to boost your growth

Ever think how it feels like to have a supportive community that will accompany you throughout your learning journey?

At Kokocoder, you will find 500+ peers who share your passion along with supportive coaches and alumni to foster the growth of mindset and ability.

Find the best coding community like no other and say goodbye to intimidating learning atmosphere.

Our Head Coach

Hello world, I'm Arnold

I have been leading a team of coaches and we've successfully helped various students to learn about coding, winning informatics olympiad, and bring them to multiple prestigious universities such as Harvard, Stanford, KAIST, NUS, NTU, Yale, HKUST, Universitas Indonesia, ITB and many more.

I also have more than 5+ years of experience of working in multinational tech companies, South East Asia Tech Startups, and Tech Industry as a software engineer.

Testimonials

Nathan Allan

SMA Kolese Kanisius 🥇 Gold Medalist OSN Informatika 2022

Learning competitive programming here helped me understand different topics and how to use them effectively. During learning sessions, the coaches gave hints to guide me to solve problems. Then, if I hadn't solved the problem, they guided me through the idea of the solution and how to implement them. They taught me until I fully understood the solution of the problem.

Matthew Hutama P.

SMA Kolese Loyola Semarang 🥇 Gold Medalist OSN Informatika 2023

Kokocoder has been a key part in my OSN journey. The private and weekend sessions have been incredibly valuable, exposing me to new topics that I haven’t learned before and a wide range of practice questions. With Kokocoder's assistance and hard work combined, acheving a medal is well within reach.

Galih Nur Rizqy

SMA Semesta Semarang | Fasilkom Universitas Indonesia 🥈 Silver Medalist OSN Informatika 2022

Learning at kokocoder made me love competitive programming even more. Kokocoder helped me a lot to improve my skills and become more enthusiastic about learning competitive programming. For me, 2 hours of learning at kokocoder is equivalent to 24 hours of learning at another place.

Nathania Jesslyn

SMA Santa Maria Cirebon 🥉 Bronze Medalist OSN Informatika 2023

During my preparation for OSN, the Kokocoder team always gave me encouragement, gave me motivation, and especially when the tiredness began to cloud my focus on solving the lesson problems, coaches and Kokocoder Troops kept me back on track.

Ibu Margaretta Wangsa

Parent of Nathan Allan 🥇 Gold Medalist OSN Informatika 2022

We entrusted our son, Nathan Allan to learn at Kokocoder because the coaches were medalists of OSN, which highlighted their competency. In Kokocoder, they teach lessons that start from the basic to advanced ones. The learning process was very enjoyable and does not get boring at all. Thank you for all the cool coaches, we hope you can keep up the enthusiasm to share more knowledge. Always wishing success for Kokocoder. God bless.

Ibu Trifina

Parent of Roberto 🥇 Gold Medalist OSN Informatika 2022

I am the mother of Roberto, who is grateful that my son got to know and joined Kokocoder. Here, the coaches don't just teach OSN materials and practice problems, but there are also mental strengthening sessions before entering a competition. At times they are rivals, but they are best of friends as well. Sometimes, i can see that my son was burned out and grew tired of doing the problems. But when he saw his friends improved and got ahead, he got motivated catching up to them. If you ask me where to learn coding especially for OSN, Kokocoder is the best place 👍👍

Belajar Coding dari Nol sampai Medali OSN Informatika

Kokocoder melatih siswa SMP dan SMA di seluruh Indonesia menulis program, memahami algoritma, dan bertanding di competitive programming. Materinya disusun oleh para medalis olimpiade. Di OSN Informatika 2026, siswa kami meraih 25 dari 30 medali nasional.

Kelas OSN Informatika

Satu jalur latihan dari OSN-K, OSN-P, sampai OSN nasional: materi algoritma, latihan soal, simulasi lomba, dan pembahasan bersama pelatih medalis.

Lihat Kelas OSN Informatika →

Knight Camp

Bootcamp competitive programming beberapa hari penuh. Siswa berlatih memecahkan soal dan menyusun strategi lomba langsung bersama pelatih.

Lihat Program Knight Camp →

Persiapan Kuliah Ilmu Komputer

Mau kuliah informatika atau computer science? Kuasai pemrograman dan dasar ilmu komputer sebelum semester pertama dimulai.

Lihat Kelas Persiapan Kuliah →

Pertanyaan yang sering diajukan

Apa itu OSN Informatika?

OSN (Olimpiade Sains Nasional) Informatika adalah lomba pemrograman dan pemecahan masalah tingkat nasional untuk siswa SMA/sederajat di Indonesia. Seleksinya berjenjang: OSN-K (kabupaten/kota), OSN-P (provinsi), lalu OSN nasional. Peserta terbaik melaju ke pelatihan nasional (Pelatnas) untuk seleksi tim IOI.

Apa itu competitive programming?

Competitive programming adalah lomba menyelesaikan soal algoritma dengan menulis program yang benar dan cepat dalam batas waktu. Keterampilan ini menjadi inti OSN Informatika dan ICPC, dan terpakai lagi saat kuliah ilmu komputer maupun wawancara kerja di perusahaan teknologi.

Apakah pemula tanpa pengalaman coding bisa ikut?

Bisa. Kelas dimulai dari dasar pemrograman C++ dan logika, lalu naik bertahap ke algoritma dan struktur data sampai level OSN.

Bagaimana prestasi siswa Kokocoder di OSN Informatika?

Di OSN Informatika 2026, 45 dari 60 finalis adalah siswa Kokocoder. Mereka meraih 3 emas, 9 perak, dan 13 perunggu (25 dari 30 medali nasional), ditambah 8 Juara Harapan.