T

Toss

Fintech super-app for payments and banking

AI Engineer – Brain - Aioc

Natural Language Processing & LLMsConfirmed live in the last 24 hours
Full-timeSeoul, South KoreaNo salary listedIn-person

About the Job

Requirements

  • Experience leading the process from problem definition through model design, experimentation, and quantitative evaluation is desirable; candidates should be able to systematically improve quality using datasets, metrics, and guardrails, quantify uncertainty, and establish validation approaches.
  • Experience using current AI technologies, including multi-agent systems, large language models, retrieval-augmented generation, or multimodal models, to solve complex business problems is required.
  • Experience designing solutions that consider service applicability and scalability is desirable.
  • Ability to understand and optimize trade-offs among quality, latency, and cost is required.
  • Experience designing and experimenting with models that integrate varied data types, including text, images, audio, and structured data, is required.
  • Production-level AI agent development and iterative improvement experience, including text- or image-based agents, is sufficient; prior voice-related experience is not required.

Responsibilities

  • Design and implement core capabilities that serve as the brains of text- and image-based agents and real-time voice agents.
  • Design and experiment with prompts, agent configurations, retrieval-augmented generation, context engineering, evaluation, tool calling, and guardrails so AI agents can achieve objectives effectively and safely in different environments.
  • Perform quantitative evaluation and validation of probabilistic AI and machine-learning components, and design pipelines for iterative improvement.
  • Identify improvements from customer feedback and business metrics, then iteratively improve AI agents so they interact naturally with customers and produce business outcomes.
  • For text- and image-based agents, enable accurate understanding and use of multimodal inputs and rich context; for real-time voice environments, design intelligent and efficient agent configurations that provide low-latency, high-quality conversational experiences.
  • Design solutions that consider technical rigor, business applicability, and sustainability, and explore opportunities to apply AI in areas that have not yet been clearly defined.

Desired Qualifications

  • Show concrete examples of what was improved and the resulting impact, rather than merely listing modeling techniques.
  • Present experience through the progression from constraints to problem definition, experiment design, evaluation, and improvement.
  • Describe contributions to collaboration and problem solving beyond technical work.

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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