Senior Data Engineer (Cosmos DB, Azure)

We are seeking a Senior Data Engineer with expertise in Cosmos DB and Azure, skilled in designing, implementing, and maintaining robust cloud-based data solutions. This role focuses on ensuring platform reliability, optimizing performance, and enabling scalable and efficient data operations within a production-grade environment. Responsibilities • Provide end-to-end support for Cosmos DB–based databases, including monitoring, troubleshooting, and performance tuning • Work extensively with Cosmos DB (NoSQL API) and other Cosmos DB variants (Core SQL, Mongo API, Cassandra API, Table API) • Support and maintain data platform components within Azure Fabric • Diagnose and resolve production issues related to data access, latency, throughput, and availability • Implement best practices for scalability, security, backup, and disaster recovery • Collaborate with application, data engineering, and platform teams to support data-driven solutions • Contribute to automation, scripting, and operational improvements • Participate in on-call or production support rotations as required • Document operational procedures and support knowledge base Requirements • 5+ years of experience as a Data Engineer or in a similar role • Strong hands-on experience with Cosmos DB, including its NoSQL API and data variants • Expertise in managing data platforms hosted on Azure, including Azure Fabric • Solid understanding of NoSQL data modeling, partitioning techniques, and performance optimization • Competency in troubleshooting production database issues in cloud environments • Proficiency in Azure tools and services for monitoring and management • Strong troubleshooting and analytical skills • Calm, methodical approach to production support and incident management • Good communication skills, ability to work with both technical and non-technical stakeholders • Ability to prioritize effectively in high-availability environments • Collaborative mindset and ownership mentality • Excellent written and verbal communication skills in English (B2+ level) Nice to have • Experience with code generation, including non-AI and AI-assisted approaches • Exposure to Data Science workflows • Experience with Big Data platforms and distributed systems • Knowledge of financial instruments and financial services data • Hands-on experience with industry-standard LLMs (including GPT, Claude, or similar) We offer/Benefits We gather like-minded people: • Engineering community of industry professionals • Friendly team and enjoyable working environment • Flexible schedule and opportunity to work remotely within Poland • Chance to work abroad for up to 60 days annually • Business-driven relocation opportunities We provide growth opportunities: • Outstanding career roadmap • Leadership development, career advising, soft skills, and well-being programs • Certification (GCP, Azure, AWS) • Unlimited access to LinkedIn Learning, Get Abstract, Cloud Guru • English classes We cover it all: • Stable income (Employment Contract or B2B) • Participation in the Employee Stock Purchase Plan • Benefits package (health insurance, multisport, shopping vouchers) • Strategically located offices featuring entertainment and relaxation zones, table tennis and football, free snacks, fantastic coffee, and more • Referral bonuses • Corporate, social and well-being events Please, note: • The set of bonuses might vary based on the role you apply for – specifics will be discussed with our recruiter during the general interview. • We will reach out to selected candidates exclusively. EPAM is a leading global provider of digital platform engineering and development services. We are committed to having a positive impact on our customers, our employees, and our communities. We embrace a dynamic and inclusive culture. Here you will collaborate with multi-national teams, contribute to a myriad of innovative projects that deliver the most creative and cutting-edge solutions, and have an opportunity to continuously learn and grow. No matter where you are located, you will join a dedicated, creative, and diverse community that will help you discover your fullest potential.