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Full Stack Engineer at Sur. Our client is revolutionizing Meta media buying with AI-powered workflows. They’re looking for a talented Senior Full-Stack Engineer to join our growing engineering team. You’ll take full ownership of core systems, from data models to production deployments. You’ll play a crucial role in building features that power sophisticated ad campaigns reaching millions of people globally.. Responsibilities:. . Backend Mastery.. . Architect, implement, and operate our Node.js + TypeScript services – data models through CI/CD – without hand-holding.. . Front-End Craftsmanship.. . Ship React components using hooks and state libs, nail pixel-perfect UIs, and squash cross-browser quirks.. . LLM Feature Integration.. . Design prompts, manage streaming, and build rate-limit/cost controls around GPT-class models.. . End to End Feature Lifecycle.. . Take features from spec → prototype → code → deploy → monitor, owning each step without hand-holding.. . . C1 English or equivalent. . Strong experience with Node.js (Express, Nest.js), Typescript, and Next.js for both front-end and back-end development.. . Hands-on familiarity with AI tools/workflows and ability to integrate AI into development processes effectively.. . Comfortable working with cloud platforms, APIs (especially Facebook Marketing API), and debugging with minimal documentation.. . Highly autonomous and self-directed, with a problem-solving mindset and willingness to ask questions when needed.. . Curious and self-taught with new technologies, especially in the AI/ML space; stays ahead of emerging trends.. . Able to thrive in a fast-paced, collaborative startup environment, balancing speed with high-quality code delivery.. . Previous experience in small teams/startups preferred; adaptable to working with distributed teams across time zones.. . Familiarity with Facebook APIs and marketing platforms is a strong plus. . . Company Location: Mexico.