Senior Full Stack AI-first Saas Engineer

Accountabilities:

You will take end-to-end ownership of product features while contributing to architecture, engineering quality, and the continued development of an AI-first SaaS platform.

• Build and deliver full-stack features using React, TypeScript, and Node.js.
• Develop intuitive, performant, scalable frontend experiences for a complex B2B SaaS product.
• Implement backend services, APIs, business logic, and third-party integrations.
• Develop and integrate AI-powered product features into production systems.
• Participate in system design and architectural decisions.
• Use AI-assisted development tools such as Claude Code, Cursor, GitHub Copilot, or similar solutions to accelerate development.
• Review, debug, test, and refine AI-generated code while maintaining full ownership of implementation quality.
• Take responsibility for CI/CD and DevOps aspects related to the features you build.
• Work closely with Engineering and Product teams to define requirements and translate them into effective technical solutions.
• Contribute to Agile ceremonies and collaborate effectively with a distributed international engineering team.
• Communicate technical and architectural decisions clearly to both technical and cross-functional stakeholders.
• Continuously improve application quality, scalability, maintainability, and development practices.

Requirements:

The ideal candidate is an experienced full-stack engineer who combines strong technical fundamentals with product ownership and practical experience using AI throughout the software development lifecycle.

• 5+ years of professional software development experience.
• Strong professional experience with Node.js and React.
• Solid knowledge of TypeScript.
• Proven experience building and integrating REST APIs.
• Strong full-stack capabilities with the ability to work confidently across frontend and backend systems.
• Experience developing and deploying AI-powered features in a production environment.
• Practical experience with AI coding assistants such as Claude Code, Cursor, GitHub Copilot, or similar tools.
• Strong understanding of software engineering fundamentals, testing, debugging, maintainability, and code quality.
• Experience working with cloud environments and CI/CD pipelines.
• Understanding of scalable and distributed system architectures.
• C1-level English or higher, with strong written and verbal communication skills and the ability to discuss technical and architectural topics confidently in real time.
• Experience working in a product or SaaS environment.
• Experience with Python is a plus.
• Experience with AWS or another major cloud provider is advantageous.
• Familiarity with Docker, Kubernetes, or microservices is a plus.
• Experience with LangChain, LangGraph, or similar AI/agent frameworks is desirable.
• Experience building high-scale SaaS products with complex and polished user interfaces is an advantage.
• Background in security, compliance, GRC, or developer tools is beneficial.
• Experience taking ownership of frontend development within a full-stack team is a plus.
• Experience with automated testing and QA practices is desirable.

Benefits:

• Fully remote work environment.
• 1:1 English language classes.
• Premium medical insurance.
• Supportive, collaborative, and international team environment.
• Necessary work equipment provided.
• Accounting support in Ukraine and Poland.
• 18 days of annual paid vacation.
• 7 days of sick leave without a doctor's note.
• Flexible payment system with multiple withdrawal options.
• Opportunity to work on an AI-first B2B SaaS product.
• Exposure to modern AI-assisted software development practices and technologies.