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Leads the QA team at Toss Payments, defining quality processes, automating tests, and ensuring stable releases for B2B/B2C payment services.
Analyzes security threats and incidents for Toss Bank’s services, designs threat models using SIEM logs, and automates responses with Python/PowerShell to protect electronic transactions.
Leads internal audits of Toss Securities’ privacy/data systems, ensuring compliance with laws like the Personal Information Protection Act and Credit Information Act across data lifecycle stages (collection, use, deletion). Focuses on AI-driven services, anonymized data, and breach prevention while collaborating with cross-functional teams to improve security controls and report findings.
Oversee internal security audits, compliance checks, and control improvements for Toss Bank’s IT and financial systems, ensuring adherence to banking and privacy regulations.
Leads internal security audits for Toss Securities’ IT infrastructure, ISMS-P/ISO 27001 compliance, and data protection systems, collaborating cross-functionally to assess controls, cloud security (MSA/k8s), and incident response processes while drafting remediation plans.
Leads a team that designs and executes security audits, compliance checks, and internal control improvements for a digital bank, ensuring adherence to financial regulations and mitigating risks.
Security Engineer at Toss analyzes security events, designs detection rules, and responds to incidents using SIEM, EDR, and threat intelligence to protect services and employee environments.
Build and operate a SIEM-based security monitoring system, analyze security events, and respond to incidents for Toss Securities, using tools like Splunk and ELK.
Build and operate endpoint-security solutions for Toss Bank, including device security, access control, AI-driven security, and supply-chain defenses.
Designs and implements cloud-native security architectures (AWS/GCP/Azure) to protect financial infrastructure, automating compliance and threat detection with Python and Terraform.
Build and run endpoint-security controls (SOAR, ZTNA, cloud/container) for Toss Securities, balancing security with user experience and automating policy enforcement across Windows/macOS fleets.
Build and operate security infrastructure (firewalls, IAM, Zero Trust) to protect Toss’s fintech services and employee systems while ensuring compliance with financial regulations.
Security Engineer in the Security Purple Team, responsible for designing, building, and operating SIEM (Splunk, Opensearch, Elasticsearch) and log pipelines (NIFI, KAFKA, Hadoop) across On-Prem, AWS, and K8S environments, focusing on log collection, analysis, and automation.
Perform penetration testing and vulnerability analysis on Toss’s web and mobile apps to find and fix security flaws before attackers do.
Performs penetration testing and vulnerability assessments on Toss’s financial services (web/mobile), researches new attack methods, and improves security for infrastructure and DevOps environments.
A Security Researcher performs simulated hacking (APT attacks) and infrastructure diagnostics to proactively identify and mitigate vulnerabilities across Toss’s financial systems, collaborating closely with engineering teams to enhance security while balancing usability.
Build and maintain Toss’s security platform, designing IAM and auth gateways, and creating pre-deployment defenses to block vulnerabilities and malicious code before they reach production.
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.
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.
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