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Toss

Fintech super-app for payments and banking

Security Researcher

Offensive Security & TestingConfirmed live in the last 24 hours
Full-timeSeoul, South KoreaNo salary listedIn-person

About the Job

Requirements

  • Experience reviewing security and identifying vulnerabilities in large-scale operational services, including conducting penetration tests.
  • Interest in emerging technology trends and the ability to develop alongside colleagues.

Responsibilities

  • Conduct penetration tests and vulnerability assessments on Toss internal and external services, including web and mobile applications.
  • Conduct APT penetration tests and research and analyze new hacking techniques and defensive measures.
  • Design service architectures that provide secure and convenient services.

Desired Qualifications

  • Experience researching or establishing security review approaches for the latest information technology.
  • Awards from domestic or international penetration-testing competitions, or bug bounty experience.

About the Company

Toss

Fintech super-app for payments and banking

Toss is a South Korean financial services platform that started as a peer-to-peer money transfer service and has grown into a digital 'super app' for personal finance. Its products are accessed through one mobile interface that unifies bank accounts, credit cards, loans, investments, and other financial services, including its own Toss Bank and Toss Securities. It differentiates itself by offering a broad, integrated ecosystem—combining digital banking, asset management, and brokerage services under one roof and running its own banking and securities units. Its goal is to become the leading consumer finance platform in South Korea while expanding its user base globally.

Company size
1,001-5,000
Company stage
Series G
Total funding
$1.5B
Headquarters
Seoul, South Korea
Founded
2011

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