Site Reliability Engineer

We are seeking a Site Reliability Engineer to join a five-member engineering team in Warsaw supporting the digital payments infrastructure of a global leader in payment network technology, whose high-volume backend services power leading digital wallet platforms. In this role, you will keep business-critical payment systems available around the clock, working alongside development teams to resolve production incidents, drive root cause analysis, and automate your way to more reliable, better-performing services. Responsibilities - Production Reliability & Incident Resolution: Own day-to-day SRE work across tokenization applications, products and services, including maintenance, incident handling and 24x7 application support for multiple large-scale distributed systems. - Proactive System Health Analysis: Monitor availability and analyze OS and application metrics with Prometheus, Grafana and ClickHouse to detect problems early, find faults and tune performance with little or no guidance. - Root Cause Analysis & Client Issues: Investigate issues reported by clients and partners, contribute to RCA, and deliver solutions that prevent recurrence. - Automation & Platform Tooling: Build software and systems to manage platform infrastructure and applications, and create sustainable services through automation and Gen AI–based initiatives. - Reliability Engineering & SLOs: Balance product velocity and reliability with well-defined service-level objectives, partnering with development teams on rigorous testing and release procedures. - Capacity & Design Input: Take part in system design consulting, platform management and capacity planning, measuring and optimizing performance to stay ahead of customer needs. Requirements - Commercial experience in Site Reliability Engineering or backend production support; hands-on SRE experience is strongly preferred. - Incident Management & Reliability Principles: Strong operational understanding of incident management workflows and reliability engineering practices. - Java Diagnostics: Solid knowledge of Java with a focus on backend troubleshooting, diagnostics and issue resolution in Java-based runtimes. - Database Proficiency: Hands-on experience with PostgreSQL and Oracle DB, including CRUD operations and complex data manipulation. - Monitoring & Telemetry: Practical experience with Prometheus and Grafana for system health monitoring, plus familiarity with analytics tools such as ClickHouse. - Backend Orientation: A purely backend focus; mobile application development experience is not required. Nice to have - Distributed Messaging: Awareness of or hands-on experience with Apache Kafka or Hazelcast. - Payments Domain Exposure: Experience supporting high-volume, business-critical transaction systems. - Automation with Gen AI: Experience applying AI-based tooling to operational automation. We offer - Opportunity to work on bleeding-edge projects - Work with a highly motivated and dedicated team - Competitive salary - Flexible schedule - Benefits package - medical insurance, sports - Corporate social events - Professional development opportunities - Well-equipped office About Us Grid Dynamics (NASDAQ: GDYN) is a leading provider of technology consulting, platform and product engineering, AI, and advanced analytics services. Fusing technical vision with business acumen, we solve the most pressing technical challenges and enable positive business outcomes for enterprise companies undergoing business transformation. A key differentiator for Grid Dynamics is our 8 years of experience and leadership in enterprise AI, supported by profound expertise and ongoing investment in data, analytics, cloud & DevOps, application modernization and customer experience. Founded in 2006, Grid Dynamics is headquartered in Silicon Valley with offices across the Americas, Europe, and India.