T

Toss

Fintech super-app for payments and banking

Data Analytics Engineer - Data Warehouse

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

About the Job

Requirements

  • Have a basic understanding of the Hadoop ecosystem, databases, data warehouses, and distributed data processing.
  • Understand SQL anti-patterns and be able to build basic applications with Python.
  • Have experience simplifying and automating complex or repetitive problems using data models.
  • Be able to set standards from the perspectives of clear data structures and efficient data use, rather than only processing requests.
  • Have experience communicating with stakeholders across multiple disciplines to clarify data requirements and build agreement.

Responsibilities

  • Design and operate the ingestion layer that brings dozens of source types, including app and server logs, service databases, and external files, into the data warehouse, excluding real-time ingestion.
  • Build an automated system connecting ingestion requests through loading and validation so that adding sources does not require manual effort each time.
  • Detect schema changes and data loss, and resolve structural issues together with the teams that produce the source data.
  • Discover and use tools such as the Hadoop ecosystem, Airflow, and dbt to design, develop, and optimize company-wide batch pipelines.
  • Analyze execution plans for long-running queries and reduce runtimes by adjusting partitioning, shuffling, and resource settings.
  • Research and introduce systems such as declarative dbt-based pipelines that prevent failures during compilation and continuous integration rather than fixing them after incidents.
  • Build reusable data-quality rules and systems that detect issues before data is served instead of only identifying them after the fact.
  • Validate consistency across data marts, trace the impact of problems, and notify relevant people promptly.
  • Add context to data so large language models can understand it; design semantic layers and ontologies and connect concepts in knowledge graphs.
  • Expose internal data assets through MCP and APIs so AI agents can discover tables and generate queries.
  • Build agents that detect operational incidents, analyze root causes, and submit corrective pull requests.
  • Create tools such as batch operators, ingestion automation, backfill command-line interfaces, and impact analyzers when needed.
  • Build front-end interfaces for tools when needed, including visualization tools used internally.

Desired Qualifications

  • Experience operating and troubleshooting Airflow and improving batch stability.
  • Understanding how online analytical processing query engines work and experience tuning their performance.
  • Experience building data platforms or tools that improve team productivity, including the ability to work on both data marts and platform systems.
  • Experience deriving system requirements for large-scale data processing and analysis and building the resulting systems.
  • Experience introducing or internalizing dbt, data catalogs, and metadata or lineage management tools.
  • Experience adding context to data, building semantic layers, or preparing data to help AI understand it.

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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