Senior AI-first Product Engineer

99x Brazil is seeking a Senior AI-first Product Engineer to join our growing team. We are looking for engineers who take full ownership of products and features from discovery to production, operate comfortably across the stack, and use AI as a core part of how they design, build, and scale solutions.

You will help shape technical direction, work directly with clients and stakeholders, and contribute to the evolution of engineering practices within teams, while remaining accountable for product quality, performance, and outcomes long after deployment.

Responsibilities

• Own product features end-to-end, from problem definition and architecture to deployment, monitoring, and continuous improvement
• Build AI-driven product experiences and integrate modern AI tools into the engineering workflow
• Collaborate cross-functionally with product, design, engineering, and business stakeholders to deliver impactful solutions
• Contribute across the stack, including frontend, backend, APIs, integrations, and cloud-based services
• Represent the company in technical and commercial discussions with clients, partners, and stakeholders
• Drive technical discovery sessions, solution design, and architecture discussions
• Mentor and upskill engineering teams on AI-assisted development practices and modern engineering workflows
• Optimize applications for performance, scalability, maintainability, and user experience