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Toss

Fintech super-app for payments and banking

Server Developer - Japan Product

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

About the Job

Requirements

  • Take ownership of a service through design, implementation, deployment, operations, and follow-up improvements.
  • Identify and solve important team problems across product, data, and platform areas rather than limiting work to a narrow role boundary.
  • Adapt and execute when direction and priorities change rapidly, finding solutions suited to current constraints.
  • Design new systems or substantially improve existing systems, and explain the rationale and trade-offs behind architectural choices.
  • Consider API and data-model consistency, duplicate or lost events, failure isolation, and reprocessing for reliable service operations.
  • Learn the users, policies, and data characteristics of a new market quickly, and redesign for local context rather than applying familiar approaches unchanged.
  • Influence colleagues across disciplines and organizational boundaries, proactively define unowned work, and drive it to completion.

Responsibilities

  • Build server systems that connect information discovery, search, content, and notifications into a unified product experience.
  • Use service metrics and usage data to improve the product quickly and refine features and data flows for Japanese users and local conditions.
  • Design feature boundaries, API contracts, and data ownership so that services can connect naturally to future financial products.
  • Improve data pipelines and operational foundations when needed, and collaborate with Data Engineers, ML Engineers, and Platform Engineers on areas requiring specialized expertise.
  • Design APIs, data models, and event-driven pipelines with regional service and data boundaries in mind, and reliably connect external data vendors with internal platforms.
  • Work with Product Owners, Frontend Developers, and other colleagues to clarify requirements, and own service delivery end to end, from design and implementation through deployment, observability, and incident response.

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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