Senior Full Stack AI-first Saas Engineer

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Full Stack AI-first SaaS Engineer based in France.

As a Senior Full Stack AI-first SaaS Engineer, you will build and evolve a B2B platform designed to simplify security, compliance, and AI governance. You will work across frontend and backend development, taking ownership of features from initial concept through production delivery. The role places a strong emphasis on React and TypeScript while also requiring confidence in Node.js, APIs, integrations, and backend architecture. You will develop AI-powered product capabilities and use modern AI-assisted development tools as part of your everyday engineering workflow. Working within a lean, international team, you will contribute to system design, technical decisions, CI/CD, and product development. This is an opportunity to combine strong full-stack engineering with an AI-first mindset while building a product with meaningful business impact.

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.