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Toss

Fintech super-app for payments and banking

Site Reliability Engineer - Site Reliability Engineering Team

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

About the Job

Requirements

  • Experience developing with Java or Kotlin and the Spring Framework, with problem-solving ability.
  • Ability to use performance testing to verify system availability and resolve bottlenecks.
  • Deep understanding of Linux and network systems.
  • Experience operating infrastructure based on microservices architecture, Kubernetes, Istio, Redis, Cassandra, Kafka, and Elasticsearch.
  • Ability to operate mission-critical services with a strong sense of responsibility.
  • Ability to adapt quickly to new technologies and pursue continuous growth.

Responsibilities

  • Improve and continuously optimize stability, scalability, availability, and latency metrics across company systems.
  • Improve observability systems to detect and trace large-traffic bottlenecks in real time across numerous microservices.
  • Lead emergency response and post-mortems during incidents, and prevent recurrence through automated recovery system design and architecture improvements.
  • Identify and eliminate single points of failure across infrastructure and strengthen the architecture.
  • Evaluate and adopt open-source products that meet requirements, or build platform tools to integrate systems when needed.
  • Design and operate effective monitoring systems to detect anomalies in advance and respond quickly.
  • Resolve problems arising as services grow and develop designs and solutions to prevent recurrence.
  • Build and conduct performance testing environments to support service growth.

Desired Qualifications

  • Experience operating infrastructure based on microservices architecture, Kubernetes, Istio, Redis, Cassandra, Kafka, and Elasticsearch.

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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