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Toss

Fintech super-app for payments and banking

Network Security Engineer

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

About the Job

Requirements

  • Experience building or operating network security appliances such as firewalls, IDS/IPS, VPN, and DDoS defense equipment.
  • Experience identifying security threats and preventing, detecting, and responding to them from a network perspective.
  • Understanding of TCP/IP protocols and packet analysis for troubleshooting.
  • Junior candidates with network operations experience who want to expand into security are welcome.

Responsibilities

  • Build and operate network security infrastructure in on-premises and cloud environments, participating in security architecture design and implementation, including VPC design, inline traffic inspection, and network segmentation.
  • Operate firewalls, VPN, DDoS defense equipment, and NPBs based on global security appliances such as Fortinet in high-traffic service networks; improve service stability through monitoring, incident response, and policy changes.
  • Use APIs, Python, Terraform, and Ansible to automate firewall policy validation, deployment, modification, and retirement, as well as repetitive operational work.
  • Apply network separation and access-control policies based on financial-sector information security requirements, and systematically manage operational histories and evidence.
  • Understand communications for AI services and GPU workloads to improve traffic visibility and security controls; use AI tools to improve the efficiency and accuracy of log analysis, policy review, and change-impact analysis.

Desired Qualifications

  • Experience integrating security-system APIs or automating operational work.
  • Experience completing security training or participating in security-related projects.

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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