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Toss

Fintech super-app for payments and banking

AI Platform Engineer - Platform

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

About the Job

Requirements

  • Experience applying technologies such as large language models, retrieval-augmented generation, and agents to real-world problems.
  • Ability to technically define unstructured problems and solve them systematically.
  • Experience collaborating across teams to build and operate technology as a product.
  • Experience quickly following new technology developments and incorporating them into a team.
  • Interest in turning complex AI systems into simple, consistent user experiences.

Responsibilities

  • Platformize LLM-based components, including retrieval, generation, and vector search, so that multiple teams can reuse them.
  • Design foundations that make it easier to build and experiment with agent systems, including prompts, tools, and context.
  • Organize and tool the serving and operations workflows for retrieval-augmented generation and agents so they work reliably in production after experimentation.
  • Build and provide a platform for quantitatively evaluating agent performance and quality.
  • Design a shared environment and experience that enables the team and other teams to experiment with and apply AI systems quickly.
  • Structure non-standardized technical elements and shape their direction so they can expand to broader problems.

Desired Qualifications

  • Experience independently designing and integrating retrieval-augmented generation components such as retrieval, generation, and vector search at the system level.
  • Experience selecting and operating different large language model providers, such as OpenAI API, Anthropic, Google Cloud Platform, and vLLM, for real service needs.
  • Experience structuring agents for varied purposes, applying them to services, and operating them.
  • Experience proactively designing experimentation environments or tools based on the needs of platform users, such as internal developers and model engineers.
  • Experience building and operating shared platforms or retrieval-augmented generation systems that can scale across multiple projects or domains.

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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