Toss

DevOps Engineer

Argo CD AWS Ceph CI/CD Cloud +26 skills

Build and refine CI/CD pipelines and Kubernetes-based infrastructure for Toss Securities, focusing on developer experience and robust monitoring to enable rapid, safe deployments.

ML Backend Engineer

AI Kotlin Machine Learning Python

Designs and builds backend services for AI-driven banking products, focusing on scalable ML model serving and robust server architecture in a microservices environment.

100M – 150M KRW

Security Researcher (모바일보안)

Android CI/CD C++ Cryptography DevSecOps +11 skills

Build and integrate automated mobile-app security tools (anti-tampering, obfuscation, crypto, SAST/DAST) into CI/CD to harden Toss’s Android and iOS apps.

Server Developer (Platform/Product)

API CRM ELK ERP Git +16 skills

Develops and maintains core insurance CRM, ERP, and CMS systems for agents, focusing on automation, security, and scalability using Kotlin/Java and Spring Boot.

Builds and migrates Toss Bank’s lending backend systems, transitioning legacy monolithic core-banking code to Kotlin/Spring microservices while ensuring zero-tolerance accuracy for loan calculations and regulatory compliance.

Java Kotlin Spring

Server Developer (계정계)

Java Kotlin MySQL Oracle Spring

Builds and refactors core banking systems (accounting layer) using Java/Kotlin and Spring, migrating legacy monoliths to scalable microservices for Toss Bank’s digital finance platform.

Server Developer (생산성)

Hadoop Kafka Kotlin MongoDB MySQL +2 skills

Builds and maintains scalable backend services powering Toss’s fintech products like payments, loans, and ads using Kotlin/Spring, MySQL, Kafka, and Redis.

Server Developer (3년 이상)

Cloud DevOps Elasticsearch Gradle Java +12 skills

Develops and maintains payment systems, focusing on scalability and reliability. Core technologies include Java, Kotlin, Spring, Redis, Kafka, and MySQL.

Server Developer (3년 이하)

API Cloud Elasticsearch Gradle Java +9 skills

📢 지원자 모두에게 코딩테스트 전형의 기회가 주어져요 오직 토스페이먼츠에서만 할 수 있는 경험 “시행착오를 줄여주는 동료들과 함께 나의 가능성을 새롭게 발견해요” 토스페이먼츠를 활용하는 여러 가맹점에 영향을 미치는, 20년 이상의 장기적인 수명을 가진 제품을 만들어요. 이전 기술의 히스토리를 모두 파악하고 이를 토대로 개선 방안을 찾는, 높은 복잡도와 난이도를 가진 업무들을 경험할 수…

Server Developer (Market Platform)

API Kafka Kotlin MySQL NATS +2 skills

Develops and optimizes high-performance real-time trading platforms (e.g., stock market data feeds) for Toss Securities, designing scalable architectures for APIs/WebSockets, low-latency event processing, and inter-institution communication using Go, Kotlin/Spring, and Kafka.

Server Developer (Messaging Platform Team)

ELK Grafana Hibernate Java JPA +9 skills

Server Developer building and operating Toss's messaging platform (push, Alimtalk, email) and A/B testing infrastructure using Kotlin, Java, Spring Boot, Kafka, and MySQL/MongoDB/Redis.

Server Developer (Platform)

API API Gateway Argo CD Ceph Cloud +19 skills

Builds and operates high-availability platform services for Toss Bank, including messaging, API gateways, monitoring, and caching, using Kotlin/Java and Spring ecosystems.

Server Developer (Server Platform Team)

API API Gateway Argo CD Cassandra Cloud +26 skills

Build and maintain the core platform infrastructure supporting all Toss services—distributed systems, API gateways, and developer productivity tools. Work with Kotlin/Java, Spring Boot/Cloud, Redis, Kafka, and Kubernetes to improve performance, security, and reliability across a high-traffic fintech environment.

Server Developer (Product)

AWS Cloud Docker Elasticsearch Git +11 skills

Builds and scales server systems for Toss Income, a fintech service simplifying tax refunds and income management using Kotlin, Spring, and AWS.

Server Developer (Product)

Argo CD Ceph Cloud Docker ELK +17 skills

Builds and maintains scalable, secure banking services using Kotlin/Java and Spring, focusing on high-traffic systems and innovative fintech products in a collaborative squad model.

120M – 200M KRW

Site Reliability Engineer (SRE Team)

Argo CD Cassandra Ceph Cloud Docker +22 skills

Site Reliability Engineer at Toss in Seoul, maintaining and improving the stability, scalability, and performance of high-traffic systems using Kubernetes, Java/Kotlin, and monitoring tools.

Site Reliability Engineer

Open 70d APAC

Argo CD Ceph Cloud Docker ELK +21 skills

Build and maintain monitoring, observability, and performance-testing systems to keep Toss Bank’s high-traffic services stable and scalable using Kotlin/Java, Kubernetes, Istio, Kafka, and Prometheus.

Server Developer (Platform)

Open 56d APAC

Hadoop Kafka Kotlin MongoDB MySQL +2 skills

# 토스 서버의 조직 구조를 알려드려요 토스의 Server Developer는 Product, Platform, Productivity 세 개의 Chapter로 나뉘어 일합니다. 직무명은 모두 같지만, 각 Chapter마다 집중하는 업무 영역에 차이가 있어요. Product Chapter는 유저가 직접 사용하는 토스의 서비스를 개발해요. 단순한 기능 구현을 넘어, 기술을 통해 비즈니스의…

Site Reliability Engineer

Open 48d APAC

Argo CD Bash CI/CD ELK GitHub +24 skills

Site Reliability Engineer on Toss Securities' SRE team in Seoul, responsible for preventing and responding to incidents on a high-traffic service: building monitoring/alerting around SLOs, performing deep root-cause analysis (down to Linux kernel, network, and eBPF level), and automating operations with internal tooling. Stack includes Java/Kotlin, Kubernetes/Istio, Prometheus/Grafana/ELK, and Go/