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Toss

Fintech super-app for payments and banking

Site Reliability Engineer

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

About the Job

Requirements

  • Experience transitioning growing services to scalable architectures or structurally improving systems to reliably handle large-scale traffic is desirable.
  • Understand system and language operating principles and approach code from a performance-optimization perspective, independent of programming language.
  • Able to reason logically through problems in complex distributed environments and persistently investigate root causes.
  • Strong fundamentals in Linux operating systems and kernels, and network protocols such as TCP/IP, with ability to perform low-level analysis.
  • Experience building test platforms or environments that make testing easier and more automated for colleagues is desirable.
  • Experience identifying inefficient repetitive work and solving it through code and systematization is desirable.

Responsibilities

  • Design and operate incident-response processes to respond rapidly to incidents and minimize service impact.
  • Analyze root causes of incidents and build systems that strengthen pre- and post-incident detection, shorten recovery time, and prevent recurrence.
  • Establish observability across infrastructure, networks, and Kubernetes, and connect it to service-level metrics.
  • Define service-level objectives, collect necessary metrics, and continuously improve alerting systems.
  • Identify components that may become bottlenecks as traffic grows and improve their architecture proactively.
  • Investigate incidents beyond log analysis, including eBPF, memory, networking, and kernel-level analysis, to identify complex causes.
  • Analyze application internals and provide development teams with optimized resource-configuration guidance.
  • Automate repetitive, patterned analysis and develop tools to identify and improve operational inefficiencies.
  • Automate test environments that improve service reliability and make them readily usable by colleagues.

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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