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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.
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.
Develops and maintains core insurance CRM, ERP, and CMS systems for agents, focusing on automation, security, and scalability using Kotlin/Java and Spring Boot.
Build and maintain the core server platform for Toss’s fintech services using Java/Kotlin and Spring, focusing on scalability, monitoring, and distributed systems.
Builds and operates high-availability platform services for Toss Bank, including messaging, API gateways, monitoring, and caching, using Kotlin/Java and Spring ecosystems.
Builds shared backend services and frameworks in Java/Kotlin with Spring to help teams launch and scale securities services efficiently.
Build and maintain server-side components for Toss Securities using Java/Kotlin, Spring, Redis, Kafka, and Kubernetes, focusing on high-traffic trading systems and real-time data processing.
Designs and develops high-availability, scalable server systems for Toss’s offline payment solutions, focusing on system architecture, real-time traffic handling, and end-to-end service reliability using Java/Kotlin, Spring, Kafka, and cloud-native tools.
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.
Builds and operates resilient payment infrastructure, focusing on stability, scalability, and low latency using Java, Kubernetes, and observability tools.
Designs, builds, and operates GPU infrastructure for AI/ML workloads, including bare-metal clusters, networking, and monitoring.
Maintains and scales Toss’s payment and financial services infrastructure to ensure high availability and performance using cloud-native tools and DevOps practices.
Builds and maintains a global financial data platform for securities, processing real-time market data with AI/ML pipelines using Kafka, Spark, and Iceberg.
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.
Build and maintain a cloud-based data platform across AWS and GCP for a fintech scale-up, including data lakes, warehouses, orchestration, and MLOps infrastructure using Terraform, Python, Airflow, dbt, and BigQuery.
Senior DevOps Engineer supporting two teams maintaining a loyalty platform across seven European markets, working with Azure, AWS, CI/CD pipelines (Azure DevOps, GitHub Actions), Terraform for IaC, and Grafana/Prometheus for monitoring.
Senior Platform DevOps Engineer owning the enterprise observability platform (Grafana Cloud, Prometheus, Thanos) and Kubernetes/OpenShift integrations for an insurance group's platform engineering team.
DevOps Team Lead for a financial-sector client, managing Linux (RHEL) environments, building CI/CD pipelines, and supporting dev teams with containerization (Docker, Kubernetes), cloud (AWS), and monitoring (Prometheus, Grafana) technologies.
DevOps Engineer maintaining an anti-fraud platform on GCP/GKE with SAS Viya 4, building CI/CD pipelines for Java and analytical workloads, and automating operations using Bash, Kubernetes, and monitoring tools.
DevOps Engineer at LUX MED (healthcare) in Warsaw, optimizing Kubernetes clusters, building CI/CD pipelines with GitHub Actions and ArgoCD, implementing observability (Grafana, Prometheus, OpenTelemetry, ELK), managing IaC via Terraform, and enforcing security practices.
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