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Toss

Fintech super-app for payments and banking

Server Developer - Messaging Platform Team

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

About the Job

Requirements

  • Experience designing, developing, and operating messaging systems.
  • Experience designing and operating highly available, scalable systems.
  • Experience operating systems that handle large-scale traffic.
  • Experience analyzing and resolving incidents, including issues caused by configuration differences across affiliates.
  • Ability to analyze and respond directly to application configuration differences across affiliates.

Responsibilities

  • Develop and operate systems that send Toss customer messages, including push notifications, alerts, KakaoTalk notification messages, and email.
  • Build and operate systems for multiple affiliates and global environments using a shared codebase, deciding which environment-specific configuration differences the application should handle.
  • Build in-house functionality instead of relying on external solutions, including developing and operating an SMTP server for email delivery.

Desired Qualifications

  • Experience with the technologies used at Toss: Kotlin, Java, Spring MVC, Spring Boot, JPA/Hibernate, MySQL, MongoDB, Redis, Kafka, ELK, Prometheus, Thanos, and Grafana.
  • Experience improving the performance of applications handling large-scale traffic.
  • Experience operating mission-critical services and building reliable services with a strong sense of responsibility.

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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