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Toss

Fintech super-app for payments and banking

ML Backend Engineer

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

About the Job

Requirements

  • Experience developing and operating servers using at least one of Python, Kotlin, or Go.
  • Ability to design robust service architectures and implement code with a stable structure.

Responsibilities

  • Design and develop foundational server architecture to reliably serve the various AI products supported by the ML Service Team.
  • Develop individual services based on robust server architecture that can reliably handle large-scale traffic.
  • Develop servers that serve AI models requiring heavy computation with stable response times and throughput.
  • Operate services with distributed tracing in an MSA environment and build an environment that minimizes incidents.

Desired Qualifications

  • Experience deploying, monitoring, and reliably operating servers in a Kubernetes environment.
  • Experience and ability to develop and operate production services handling large-scale traffic or with high SLAs.
  • Experience solving large, complex problems with software technology or creating business impact through a service or product.
  • Interest in AI/ML and willingness to build experience in this area; prior ML experience is not required.
  • Concrete examples of server development, technical problem-solving and implementation, weighing architecture complexity against implementation resources, business impact, and production deployment with performance improvement based on metrics.

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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