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Kake

Senior Fullstack Engineer (Next.js/AI Agents)

Latin America

August 27, 2026 at 7:38 AM

✨ AI summary

Location

  • Argentina (Remote)

Languages

  • JavaScript/TypeScript
  • SQL

Frameworks

  • Next.js (Pages Router)
  • React 18
  • Material UI
  • Inngest
  • Retool

Databases

  • PostgreSQL
  • Qdrant (vector DB)

We're looking for a product-minded fullstack engineer to join a fast-moving team building AI-powered products at the intersection of great UX and applied AI. This role is heavy on product thinking, UI craft, and building with multi-agent systems and LLMs — not on infrastructure or distributed systems work. You'll be working across a modern Next.js/React stack while designing agentic workflows and MCP server integrations, so strong instincts for both clean interfaces and reliable AI system design are essential. This is a great fit for someone who loves building polished, delightful products and is excited to work at the leading edge of applied AI (multi-agent systems, RAG, voice agents).


Key Responsibilities


  • Design, build, and ship fullstack features across the product, from UI to backend logic
  • Build and maintain agentic workflows, including multi-agent systems and MCP server integrations
  • Collaborate closely with design to implement polished, animated, high-quality UI using Material UI and Figma specs
  • Build and maintain RAG pipelines and integrations with multiple LLM providers (Gemini, GPT, Claude, Perplexity)
  • Work with async job processing (Inngest) and Postgres-backed data models
  • Contribute to internal tooling and back-office workflows (Retool)
  • Partner with product and design to translate requirements into technical solutions
  • Write clean, maintainable code and participate in code review


Core Requirements


  • Strong experience with Next.js (Pages Router) and React 18
  • Experience building and reasoning about multi-agent AI systems and agentic workflows
  • Solid backend experience with Postgres and building APIs (e.g., Next.js API routes)
  • Strong product sense and a genuine interest in UI quality, animation, and design systems
  • Experience integrating with LLM APIs (e.g., OpenAI, Anthropic, Gemini) and/or RAG pipelines
  • Excellent written and verbal communication skills in English
  • Ability to work independently in a remote, fast-paced environment


Nice-to-Have


  • Experience designing or building MCP (Model Context Protocol) servers
  • Experience building voice agents
  • Familiarity with Material UI and translating Figma designs into production UI
  • Experience with async job frameworks like Inngest
  • Familiarity with Qdrant or other vector databases for RAG
  • Experience using AI coding tools like Codex or Claude Code
  • Experience with Retool or similar internal tooling platforms


Additional


  • US Timezone Overlap: Required overlap with 9am–3pm PT (GMT-7)
  • This role is not infrastructure-heavy — you won't be working on massive distributed systems or large-scale data problems. The ideal candidate is more energized by product craft, UI polish, and applied AI than by backend scale challenges.


The icing on the Kake:


💵 Competitive Pay in USD – Work globally, get paid globally.

🏡 Fully Remote – Simply put, we trust you.

🌱 Better Me Fund – We invest in your personal growth and passions.

❤️ Compassion is Badass – Join a community that invests in social good.


Please Note: Due to the high volume of applications, only shortlisted candidates will be contacted.