Senior Full-Stack Engineer (AI-Focused)

New

Remote, Argentina, Strong overlap with US working hours requiredFull-TimeSenior

Salary84,000 - 100,000 USD per year

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Job Details

Have 6+ years as a full-stack engineer on production SaaS.
Bring strong TypeScript or JavaScript experience on both frontend and backend.
Have experience with a modern frontend framework.
Have solid Elixir and Python skills.
Have shipped LLM features to production, including model APIs, RAG, tool calling, or agents.
Have a track record of measuring LLM output quality through evaluations or similar systems.
Have working knowledge of high-volume WebSocket traffic and its architectural implications.
Use AI coding agents daily and exercise judgment about human review and guardrails.
Have C1 or C2 English proficiency and be comfortable discussing technical topics with engineers and presenting tradeoffs to leadership.

Build AI features across the interface, services, APIs, and LLM layer.
Develop the in-product AI agent, from prompt design through production evaluations.
Build LLM pipelines using RAG, tool calling, agent orchestration, and evaluation.
Create MCP integrations that connect the platform with customers' AI tools.
Manage the speed, reliability, and cost of AI features, measuring latency and quality.
Shape the AI-first roadmap and architecture with the CTO and product team.
Establish coding-agent workflows, guardrails, and review norms for the team.

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