Senior Back-end Engineer

We are currently looking for skilled Senior Backend Engineer (C#) to become members of our dynamic team and work closely with one of our inspiring US clients The ideal candidate will serve as a technical leader responsible for designing, implementing, and maintaining our client’s backend services and APIs within a modern, AI-first engineering ecosystem. This role focuses on ensuring that backend systems are reliable, scalable, secure, and optimized for high performance, while supporting product needs and enabling future AI-driven features. Expectations - the experience you need +90% English written and oral (at least C1 level) with excellent communication skills. 8+ years of professional experience in software development. Deep experience with SOLID principles, Clean Architecture, trunk-based development, and CI/CD pipelines using feature flags Expert-level proficiency in C# / .NET Core and modern API development. Solid experience integrating with SQL, NoSQL, and in-memory data stores (e.g., MSSQL, MongoDB, Redis). Strong understanding of distributed systems, API security, performance engineering, and cloud-native patterns. Competence with AI-assisted development tools and modern engineering automation. Strong analytical and creative problem solving capabilities. Clear, structured communication skills. Ability to work independently and collaboratively in a remote-first environment. Familiarity with AWS or Azure cloud ecosystems. What you will do Apply SOLID principles and Clean Architecture patterns to ensure maintainable, scalable codebases. Architect, build, and maintain backend services and APIs using C# and .NET Core. Integrate backend services with cloud platforms, third-party systems, and internal services. Implement performance optimizations and caching strategies using Redis or similar technologies Use AI-assisted development tools (GitHub Copilot, ChatGPT, and others) to enhance productivity, code quality, and testing Apply AI-supported techniques to identify bottlenecks, propose optimizations, and improve reliability. Participate in architectural design discussions, contributing to platform scalability and long-term technical strategy. Collaborate with Product Owners to translate requirements into backend capabilities and technical plans. Mentor junior and mid-level developers, helping them improve technical skills and AI-assisted workflows. Educational resources. Flexible schedule and Work From Anywhere. Referral Program. Supportive and chill atmosphere. We are accepting applications from LATAM countries Our offer – professional development, personal growth Hover on each benefit to learn more Decide on the form and conditions of your employment *Applicable in: Poland & Latam & MD/RO Flexible employment and remote work Work with the latest technologies for industry leaders *Applicable in: Poland & Latam & MD/RO International projects with leading global clients Travel to clients’ and work in their environments *Applicable in: Poland & MD/RO International business trips Work comfortably in a relaxed and inspiring atmosphere that does not enforce a dress code *Applicable in: Poland & Latam & MD/RO Non-corporate atmosphere Develop your skills at work – language classes come to you *Applicable in: Poland & MD/RO Language classes Develop your competences and skills through skill centers and webinars *Applicable in: Poland & MD/RO Internal & external training Take care of the health of you and your loved ones *Applicable in: Poland & MD/RO Private healthcare and insurance Work out, swim and enjoy other fun activities *Applicable in: Poland & MD/RO - monthly sport budget Multisport card Take part in activities that support your physical and mental health #J-18808-Ljbffr