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Toss

Fintech super-app for payments and banking

Server Developer - Finance Product

Backend EngineeringConfirmed live in the last 24 hours
Full-timeSouth KoreaNo salary listedIn-person

About the Job

Requirements

  • At least 1 year of professional experience.
  • Experience designing and operating systems that require high consistency of amounts and states.
  • Experience designing and operating complex flows that process large settlement datasets through batch, events, and APIs.
  • Ability to organize complex business rules into simple, consistent structures and respond flexibly to change.
  • Ability to define problems and policies together with business stakeholders, rather than only implementing prescribed requirements.

Responsibilities

  • Design and operate systems that accurately collect and calculate revenue and expense settlement data across Toss services.
  • Connect contract, service, and business-entity information to settlement criteria, and validate data so incorrect information is not recorded in settlement ledgers.
  • Process large volumes of settlement data through real-time events and batch workflows, preventing omissions and duplication while accounting for idempotency, reprocessing, reconciliation, and incident recovery.
  • Automate and build products for post-settlement workflows such as tax invoice issuance, bulk payouts, refunds, and receivables management.
  • Analyze settlement requirements for new services, connect them to shared processes, and reduce hardcoding and service-specific exceptions in existing systems.
  • Work with settlement, accounting, and business stakeholders to define complex operational rules as product policies and code, and improve system structures to prevent recurring data discrepancies.

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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