Senior Java Developer

We are looking for a highly skilled Senior Java Engineer to join our elite engineering group. In this role, you will work at the very heart of the world’s most widely used mobile operating system, maintaining and optimizing its core codebase. Responsibilities: • Core Systems Maintenance: Maintain and optimize the Android application core codebase (non-UI), ensuring the stability of vital system components. • Deep-Dive Analysis: Perform high-level analytical work, reading logs from various sources and using specialized tools to trace complex code behavior. • Bug Resolution & Debugging: Identify, reproduce, and resolve critical bugs within the Java/Kotlin codebase, delivering high-impact fixes directly to production. • Instrumentation & Observability: Design and implement advanced logging and tracing mechanisms to gain precise insights into system performance and reliability. • Discovery & Research: Act as a technical lead in the discovery phase for new support requests, investigating requirements and technical constraints. • Strategic Collaboration: Work closely with cross-functional teams and the world's leading OS engineers to align technical solutions with global standards. Min requirements: • Experience: strong professional experience in Java development (reading/writing complex code, managing JVM runtime, and writing robust tests). • Analytical Mastery: Exceptional analytical skills with a proven ability to debug large-scale systems and interpret complex log data. • Data Proficiency: Strong experience with SQL to design queries for extracting and aggregating relevant data from system logs. • Communication: Excellent communication skills with the ability to act as a technical consultant for global partners. • Language: Spoken and written English at an Upper-Intermediate (B2+) level or above. • Office Presence: Readiness to work from our innovation hub in Krakow at least 3 days a week. Would be a plus: • Android Internals: Hands-on experience with Android (Frameworks, HAL, or low-level app debugging). • Networking Protocols: Understanding of the OSI model and experience with telecommunications protocols (SIP, TLS, DNS). • Modern Tooling: Familiarity with Kotlin and Google-specific internal development frameworks. • Leadership Potential: Experience or strong desire to mentor junior engineers and take ownership of the release cycle. 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.