About Mappa Mappa builds real-time voice-AI infrastructure that decodes over 100,000 behavior patterns per person—turning prosodic and linguistic signals into actionable insights for hiring and beyond. Our mission is to provide enterprise-grade AI tools while maintaining reliability, scalability, and measurable impact. As a Senior Full-Stack Engineer at Mappa, you’ll own end-to-end features from frontend to AI workflow integration, driving the evolution of our stack and shaping our AI capabilities. What You’ll Do Ship robust, high-quality features across Next.js UI, tRPC APIs, and Prisma-powered data layers. Design, evolve, and optimize MySQL schemas on PlanetScale and Turso, including migrations, query tuning, and cost/performance improvements. Develop, iterate, and harden prompt engineering workflows: system prompts, structured JSON outputs, eval harnesses, and guardrails. Integrate LLMs and AI tools: function calling, retrieval-augmented generation (RAG) basics, observability, and failure mode mitigation. Implement and maintain end-to-end type safety from UI → API → DB. Improve developer experience, performance, and reliability: alerts, tracing, monitoring, latency metrics. Collaborate cross-functionally to own features from specification → production → metrics, ensuring measurable impact. Non-Negotiables TypeScript expert: types-first design, generics, Zod. T3 in production: Next.js (App Router / RSC), tRPC, Prisma. MySQL mastery: schema design, migrations, query tuning on PlanetScale and Turso. End-to-end type safety across UI, API, and DB layers. Prompt engineering expertise: robust system prompts, structured outputs, eval harnesses, and safety guardrails. LLM integration experience: function calling/tools, RAG basics, observability, failure mode handling. Shipping discipline: unit/e2e testing (Vitest/Playwright), CI/CD, tracing/monitoring, measurable latency and reliability improvements. Strong ownership and communication: drive features independently from concept to metrics. Nice-to-Have Experience with Qstash / Upstash. Edge deployments (Vercel / Edge functions). Integrations with WhatsApp / Meta APIs. Reranking, evaluation metrics, and model tuning. Observability frameworks like OpenTelemetry / Sentry. Exposure to Rust for system-level enhancements. Why Join Mappa Work with cutting-edge AI + voice analytics at scale. 100% remote, flexible schedule, international team. High ownership: your features impact product, AI, and business outcomes. Learning-first culture: grow in TypeScript, AI workflows, and distributed systems.