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Toss

Fintech super-app for payments and banking

Security Engineer: Network Security

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

About the Job

Requirements

  • At least three years of practical experience in enterprise security.
  • Experience preventing, detecting, and responding to diverse security threats from a network perspective.
  • Experience building and operating network security solutions, including firewalls, DDoS protection, IDS/IPS, WAF, SASE, ZTNA, and VPN.
  • Experience using various tools to automate and improve operational efficiency.

Responsibilities

  • Build and operate information security solutions that protect Toss services and employee environments.
  • Establish access-control systems for internal information systems and operate the associated solutions.
  • Build network-separation environments and data-leakage response systems in accordance with financial compliance requirements.
  • Plan and operate systems to improve security visibility and access frameworks.
  • Analyze emerging threats and global trends, plan AI-based detection and analysis capabilities, and establish real-time response strategies.

Desired Qualifications

  • Experience proactively improving infrastructure configuration and operations or designing architectures.
  • Experience leading network security responses and enhancements that account for diverse internal and external threats and internal controls.
  • Experience applying AI, open-source software, and SaaS services to solve problems.
  • Experience responding to financial compliance requirements and certification audits.

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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