Senior Full-Stack Developer (Backend-Oriented)

About the project: Join a fast-growing product company building an AI-powered B2B SaaS platform that helps organizations worldwide automate security, risk, and compliance workflows. The platform combines intelligent automation, real-time monitoring, and AI-driven insights to replace slow, manual processes with a continuously up-to-date, audit-ready experience. It serves startups, scale-ups, and enterprises, and is recognized by its customers and partners for both technology and a partnership-driven approach. Role overview: We're seeking a hands-on Full-Stack Developer to join our core R&D team and help build our cloud-based platform. You'll work across the stack, shaping the architecture, implementing new features, optimizing performance, and mentoring team members to uphold high standards. This is your opportunity to make a significant impact on a platform automating IT auditing for SaaS companies globally. Requirements: 5+ years of backend development in Node.js (C#, Java, or C++ experience also relevant), plus solid working experience with React. Proven production experience with microservices architecture. Strong skills with both relational and non-relational databases, including data modeling and query optimization. Solid experience designing, building, and integrating REST APIs. Familiarity with AWS or a similar cloud provider. Ability to own a module or technical project end to end and drive it independently. Strong software design fundamentals (principles, patterns) and a self-driven approach to problem-solving. English — Upper-Intermediate level and above, with strong verbal and written communication. Knowledge of containerization tools (Docker, Kubernetes) is a strong advantage. Nice to have: Experience developing high-scale SaaS solutions. Deep understanding of CI/CD and QA automation processes. Maturity with AI-assisted development — able to review and understand generated code rather than relying on it blindly. Academic background in Computer Science, Software Engineering, or a related field. Responsibilities: Design and build scalable backend services using microservices and containerized solutions on AWS. Participate in architectural decisions, research, and design to deliver robust, maintainable software. Model data and build/integrate REST APIs with third-party systems; contribute to frontend where needed. Work directly with Product and stakeholders to shape requirements and translate them into well-scoped tasks. Mentor teammates, promote knowledge sharing, and uphold coding standards. Continuously improve platform performance, scalability, and maintainability while keeping up with industry trends. What we offer: — Flexible Work Environment: Opportunity to work remotely. — 1:1 English Classes : Individual English language training to enhance your communication skills. — Premium Medical Insurance : Comprehensive health insurance to ensure your well-being. — Great Team: Work with a supportive, collaborative, and dynamic international team. — Equipment Provided : All necessary equipment supplied for efficient job performance. — Accounting Support: Full accounting assistance in Ukraine and Poland. — Paid Time Off: 18 days of Annual Vacation and 7 days of Sick Leave without a doctor's note. — Flexible payment system , which allows you to withdraw funds in one click and has about twenty withdrawal options. Does this position sound like a perfect match? We’re eager to hear from you!