T

Toss

Fintech super-app for payments and banking

Server Developer - Product Foundation

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

About the Job

Requirements

  • Ability to identify recurring problems and inefficiencies, understand their root causes, and solve them structurally.
  • Ability to understand the impact of one's work and break large goals into actionable steps.
  • Ability to quickly learn complex business processes and unfamiliar technology stacks.
  • Ability to select technologies appropriate to team and business needs and make work transparent so colleagues and AI tools can understand and continue it.
  • A resume should include at least one specific project example showing the candidate's participation and contribution.
  • A resume should describe how a problem was defined, what solutions were attempted, and the resulting impact.
  • A resume should describe the candidate's desired professional growth as a developer and the efforts made toward it.

Responsibilities

  • Redesign bank operational workflows into fast, simple systems that improve efficiency.
  • Build shared platforms used by internal systems, including gateways, role-based access control, approvals, and audit history.
  • Develop internal-control systems that support transparent and reliable bank operations.
  • Design systems, operational procedures, and ways of working suited to an internet bank whose work is conducted remotely.
  • Integrate machine learning, artificial intelligence, and external services into workflows to support faster and more accurate decisions.
  • Build customer-authentication platforms and integrate machine-learning models into services to provide secure, seamless authentication.
  • Operate systems covering customer registration and customer-information management, and design data consistency and transaction processing across multiple systems.
  • Develop anti-money laundering and know-your-customer services and reporting systems for fast, accurate regulatory reporting.
  • Improve fraud-detection systems by combining rules, scenarios, and machine-learning models to detect suspicious transactions in real time.
  • Design highly available systems that assess high volumes of transactions without delay and workflows for responding to detected financial fraud.
  • Build a 24/365 customer-support platform that integrates channels such as phone and chat.
  • Integrate artificial-intelligence technology into customer support, including chatbots and agents' manuals and suggested responses.
  • Design customer-support experiences and operating methods that create efficient working environments for support agents.
  • Work across call-system technologies, from telephone lines and PBX through CTI, IVR, PDS, and call recording, and build and operate highly available systems.

Desired Qualifications

  • Experience developing services with Kotlin or Java based on the Spring Framework.
  • Experience with Redis and Kafka.
  • Experience designing and reliably operating highly available services in high-traffic environments.
  • Experience migrating or transitioning legacy systems in operation without downtime.
  • Experience integrating machine-learning or artificial-intelligence technologies into real services or workflows.

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

Recently Posted Jobs

Explore more opportunities at Toss

See more jobs