Job Title: Senior Full-Stack Engineer (T3 + AI)

Location: Remote (LatAm / flexible time zones)

Type: Full-time

Reports to: CTO

Payment in USD 3600 + Commissions

PTO

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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.