We are looking for a Senior .NET Developer for our client — a global product company developing cutting-edge trading technology solutions for regulated brokers and trading firms. Their SaaS products power electronic trading, brokerage operations, risk management, and financial data analysis worldwide.The ideal candidate is not just a coder but an engineer with a product mindset — someone who understands the project end-to-end, proactively asks questions, and strives to make a real impact. This role requires taking ownership of solutions, collaborating closely with cross-functional teams, suggesting improvements, and contributing to the growth of high-performance trading platforms.MUST HAVE: strong experience with high-load microservices and deep expertise in networking (TCP/IP, gRPC, WebSockets), low-latency systems, and observability (OpenTelemetry, Prometheus, Grafana).ResponsibilitiesAnalysis and Design: Studying requirements, designing architecture, and decomposing tasks.Development and Coding: Writing clean, structured, and optimized C# code following SOLID, DRY, and YAGNI principles, working with APIs, databases, logging, and monitoring.Testing and Debugging: Creating unit/integration tests, fixing bugs, and optimizing performance.Database Management: Designing, optimizing queries, and managing migrations.CI/CD: Automating builds and deployments, working with Git and release processes.Refactoring and Optimization: Improving code readability, performance, and architecture.Deep technical collaboration: Driving architectural discussions, performing advanced code reviews, and supporting cross-functional integration at a low level.Ownership of production reliability: Diagnosing root causes of production issues, optimizing runtime behavior, and managing incident resolution pipelines.Mentoring: Training colleagues, assisting with complex technical challenges, and introducing new approaches and tools.Requirements5+ years of working experience with C#;Strong knowledge of the .NET stack (we are using .net core);Proven experience designing and implementing complex system architectures patterns;Deep practical knowledge of software development lifecycle;Experience in building resilient, high-load microservices with asynchronous communication and distributed data storage;Git, GitLab, understanding of CI\CD processes;Hands-on experience with Docker;Familiarity with RabbitMQ, Apache Kafka;In-depth expertise in TCP/IP stack, gRPC, WebSockets, and low-latency network optimizations;Knowledge of Relational DBs and NoSQL DBs — we are using Redis, MongoDB, PostgreSQL, and MariaDB;Advanced experience integrating observability stacks (e.g. OpenTelemetry, Prometheus, Grafana) for real-time diagnostics and distributed tracing.What in it for youCare from Day One: Medical insurance starting immediately (including dental care, massages, and professional psychological support) — because your well-being matters.Work-Life Balance: 25 days of paid vacation + 30 days of sick leave, so you can truly rest and recover without stress.Energy Investment: Partial reimbursement for sports activities to help you stay active and energized.Continuous Growth: Partial coverage for English or Ukrainian language courses plus a fixed budget for professional development — choose the learning path that fits you best.Knowledge Library: Access to a well-stocked office library and Kuka online library to learn, grow, and get inspired.Island Retreat: 14 days per year at the company’s corporate villa in Cyprus — perfect for recharging.Modern Offices: Unit City (Kyiv): Future-ready workspace designed for productivity, resilient to power outages. Larnaca (Cyprus): Stylish, comfortable office with open areas, cozy lounges, and fully equipped meeting rooms.Відгукнутись на вакансію