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Toss

Fintech super-app for payments and banking

Server Developer - FEP

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

About the Job

Requirements

  • Understand Linux systems, commands, and shell environments.
  • Be able to analyze specification documents or existing systems and develop accordingly.
  • For candidates with at least two years of securities-company FEP experience, understand FEP system design and functions and be able to quickly identify and resolve issues.
  • For candidates with at least two years of securities-company FEP experience, understand operational work including server, IP, and storage redundancy; disaster-recovery configuration and failover drills; certificate management; encryption and decryption; regulatory changes; performance tuning; and daemon processes.
  • For candidates without securities-company FEP experience, be able to develop in varied environments involving TCP, Oracle, Kafka, SFTP, S3, GitHub Actions, Docker, Nix, and Kubernetes.
  • For candidates without securities-company FEP experience, understand TCP network programming and be comfortable with low-level programming, Linux, and Docker.
  • For candidates without securities-company FEP experience, have a strong foundation in computer science.

Responsibilities

  • Develop, operate, and improve FEP systems, primarily using Go, and use C, Python, TypeScript, Perl, Bash, Java, or Lua when appropriate.
  • Use socket programming, primarily over TCP/IP, and techniques for transmitting, storing, and distributing data.
  • Detect and respond quickly to issues, and continuously troubleshoot systems and networks.
  • Integrate with external institutions by understanding their characteristics and protocols and preparing for potential situations.
  • Consider network and data-center configurations, redundancy strategies, and preparations for disaster scenarios.
  • Develop and operate external-connectivity platforms, including order and external FEP, internal and external file transfers, internal system integrations, and monitoring.

Desired Qualifications

  • For candidates with securities-company FEP experience, be able to design and develop FEP systems directly.
  • For candidates without securities-company FEP experience, be able to resolve even small issues clearly and develop a deep understanding of observed behavior.
  • For candidates without securities-company FEP experience, proactively identify problems, consider improvements, and troubleshoot effectively.

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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