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Toss

Fintech super-app for payments and banking

Server Developer - Platform Division

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

About the Job

Requirements

  • Finance Product: Experience developing systems in domains where data consistency and reliability are top priorities.
  • Finance Product: Interest in understanding and managing money flows and modeling complex domains in close collaboration with business stakeholders; domain experience is not required.
  • Intelligence Product: Experience building services that account for user context, such as recommendation, personalization, or advertising.
  • Intelligence Product: Interest in automating repetitive work and designing systems that operate without human intervention.
  • Intelligence Product: Experience designing pipelines to structure complex, large-scale data for fast querying and serving.
  • Intelligence Product: Interest in collaborating with planners and data analysts to formulate hypotheses, validate them through experiments, and improve products.
  • At least one year of practical work experience.

Responsibilities

  • Design and operate platforms that help company members solve complex problems safely and quickly, including settlement systems, internal solutions, and the company home screen.
  • Design and operate settlement platforms that accurately and reliably process settlements from online, offline, shopping, and other payments, aggregating millions of transactions daily and paying merchants daily.
  • Operate settlement platforms for services such as loans, cards, and insurance, and platforms that manage receivables across services.
  • Turn contract metadata and the flows from contracts to costs, payments, and revenue into systems.
  • Design and develop recommendation and advertising systems that help users discover relevant services and support business revenue growth.
  • Select and deliver relevant services in the app at optimal times through messages, and design user experiences around those interactions.
  • Design and operate servers that deliver personalized services quickly and reliably under large-scale traffic.
  • Build a CRM platform that centrally manages marketing channels such as push notifications and in-app messages, and automate campaign execution and operations.
  • Build AI agents that automatically run advertising campaigns and improve campaigns based on real-time customer responses.
  • Observe marketers' workflows, identify recurring bottlenecks, and solve them through engineering.
  • Design an experimentation platform for app-wide experiments, enabling rapid hypothesis testing and results analysis.
  • Manage the Audience lifecycle over behavioral logs and attribute data, from segment creation and experiment branching through funnel analysis.
  • Process and serve large, complex experiment datasets quickly so decision-makers can access insights immediately.
  • Collaborate closely with product managers and data analysts on experiment design and interpretation, and turn discovered workflow issues into platform solutions.

Desired Qualifications

  • Experience applying AI or machine learning technologies in production, or interest in taking on that challenge.
  • Team placement may be adjusted based on interview results, individual strengths and capabilities, and internal priorities.

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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