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Toss

Fintech super-app for payments and banking

AI Solution Engineer

AI Application Engineering +1Confirmed live in the last 24 hours
Full-timeSeoul, South KoreaNo salary listedIn-person

About the Job

Requirements

  • Ability to develop backend servers and implement data integrations reliably.
  • Ability to quickly understand unfamiliar business domains and systems and translate business stakeholders’ needs into technical requirements.
  • Understand how AI components such as automatic speech recognition, text-to-speech, and large language models work and where they can fail, and communicate about them with colleagues.
  • Interest in integrating existing AI and making it work in practice rather than pursuing deep AI research.
  • Ability to apply technology with a focus on business impact and deliver outcomes.

Responsibilities

  • Design, implement, and stabilize technical solutions needed for deployments, defining deployment scope and success criteria with business and product stakeholders.
  • Connect each deploying organization’s knowledge systems and business policies in a form that AI can use accurately.
  • Build reliable operation across different environments, focusing on backend development and data integrations.
  • Review system behavior with frontline stakeholders using real call data and improve it.
  • Feed problems and learnings from deployments back into the product so future deployments can be completed through configuration.

Desired Qualifications

  • Experience developing and operating real-time systems that manage state during persistent connections, such as call, chat, gaming, or real-time transaction systems, including technologies such as WebSocket, gRPC streaming, or WebRTC.
  • Experience repeatedly building similar integrations for multiple organizations or customers and then reducing future implementation time through shared modules or configuration-based structures.
  • Experience coordinating requirements through direct communication with stakeholders in other internal teams.
  • Experience building features using large language models and applying them in a service.
  • Experience implementing frontend components in addition to backend work.
  • Knowledge of call-based business domains such as consulting, customer service, or outbound telemarketing.

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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