Senior AI-first Product Engineer

99x Brazil

20h•Remote

About The Position

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. The ideal candidate has proven experience driving AI adoption and upskilling engineering teams on AI-assisted workflows, while remaining accountable for product quality, performance, and outcomes long after deployment.

Requirements

6+ years of experience in software engineering, with strong expertise in React, Next.js, Typescript, Node or Python
Proven experience building and scaling modern web applications across the full stack
Strong understanding of software architecture, distributed systems, APIs, and scalable application design
Hands-on experience using AI tools and AI-assisted development workflows as a core part of the engineering process
Demonstrated product ownership mindset, with experience leading features or products from discovery to production and beyond
Ability to think from first principles, challenge assumptions, and solve complex business and technical problems
Strong communication and presentation skills, with the ability to represent technical solutions in client-facing and commercial discussions
Proven experience mentoring engineers and driving AI upskilling initiatives within development teams
Solid understanding of modern frontend development practices, component architecture, and responsive design principles
Familiarity with cloud platforms, CI/CD pipelines, monitoring, and modern DevOps practices
Advanced English communication skills, both written and verbal

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
Write clean, maintainable, well-tested, and well-documented code
Stay up to date with emerging technologies, AI trends, and modern software engineering practices