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Toss

Fintech super-app for payments and banking

Network Software Engineer

Backend EngineeringConfirmed live in the last 24 hours
Full-timeSeoul, South KoreaNo salary listedIn-person

About the Job

Requirements

  • Experience designing and developing software with failures and exceptional conditions in mind, and analyzing and improving issues arising in operation.
  • Ability to define problems through stakeholder discussion and design solutions that account for security and reliability.
  • Understanding of basic network operation, including TCP/IP, and ability to learn unfamiliar technologies or domains to solve problems.

Responsibilities

  • Design and develop Toss internal VPN servers and clients.
  • Develop and operate highly available network products that run 24 hours a day, including Active-Active redundancy.
  • Work with white-hat hackers and security engineers to define access-control and monitoring requirements, and design and implement the necessary policies and features.
  • Improve productivity and reliability within Toss while ensuring security.
  • Create and operate ZTNA VPN access to work systems for Toss employees, and improve security, reliability, and usability based on user feedback.

Desired Qualifications

  • Experience developing or operating load balancers, gateways, or access-control systems.
  • Experience using OS networking features or developing client software.
  • Experience developing software with Go.

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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