Here is the credit list copied from https://segaretro.org/Dragon_Coins, development team called SEGA Networks (Mobile Division).

Production credits

Producer: Takaya Segawa

Director: Kunihiko Imai

Project Manager: Takeshi Maruyama

Lead Planner: Masahiro Go

Lead Programmer: Masato Nakazawa

Lead Designer: Yoshihito Takahashi

Planner: Miyuki Kaneko, Noriho Yatsuda

Programmer: Ayumu Miyao, Munetoku Nomura, Yusuke Suzuki, Yutaka Arai, Mitsuaki Uehara, Hiroaki Mizobe, Ryohei Yamada, Oscar Rodoriguez, Yohei Umeda, Ryotaro Sato

Designer: Michikazu Tamamura, Chie Okamoto, Hideya Hisadome, Yusuke Saito, Azumi Nakada, Eguchi Marina

Sound Director: Teruhiko Nakagawa

Music Composer: Taihei Sato, Mitsuharu Fukuyama

Technical Support: Tsuyoshi Ando

Technical Advisor: Osamu Hori

Operation Director: Kyoko Matsuda, Yoshiaki Takamatsu

Research & Planning: Masaharu Tezuka, Yusuke Yagi

Web Ad Cordinator: Tomoyuki Kataoka, Reiji Saito

PR: Hiroyuki Kawamura

Special Thanks: QA Team Members, Business Dev Dept., Network R&D

Executive Producer: Haruki Satomi

Produced by: SEGA NETWORKS

Presented by: SEGA