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# Senior Full-Stack TypeScript Engineer - AI/Agent Systems (PT-LATAM)

- **Company:** Arc Full-time
- **Location:** United States (Remote available)
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** LangGraph Framework, Application Programming Interfaces (APIs), Artificial Intelligence, Application Services, User Authentication, Software as a Service, Databases, Data Systems, Software Debugging, PostgreSQL, Node.Js, Next.js, Systems Integration, TypeScript, Data Ingestion, ReactJS, Large Language Models, Agentic-AI, AI Platforms, Playwright, Codebase, Graphql, Api Design, JestJS, Web Api
- **Published:** October 7, 2026
- **Apply:** https://arc.dev/signup?userType=developer&publicRandomKey=ppo9sb3gzv&to=https%3A%2F%2Farc.dev%2Fdashboard%2Fd%2Fverified-jobs%2Fppo9sb3gzv%2Fapplication

## About the Role

Node.jsPostgreSQLTypeScriptNext.jsLlm agents, English・Professional, * Extensive experience with TypeScript and Node.js.

 * Proficiency in modern Next.js and React applications.
 * Strong backend engineering skills, including API development, PostgreSQL, authentication, and data modeling.
 * Experience with production applications integrating LLMs and AI agents.
 * Ability to troubleshoot and debug complex production environments.
 * Strong understanding of business logic to effectively translate it into technical solutions., * Experience with AI frameworks like CopilotKit, LangGraph, Mastra, or AG-UI.
 * Familiarity with Vercel AI SDK and OpenRouter.
 * Proficiency in tRPC, GraphQL, or other strongly typed API architectures.
 * Experience with Supabase, Clerk, or similar authentication solutions.
 * Background in developing background processing workflows with Trigger.dev or similar systems.
 * Knowledge of data ingestion or document/article processing pipelines.
 * Experience with scoring, ranking, recommendation, or analytics systems.
 * Familiarity with Vitest, Playwright, D3, or Recharts.

## Description

We are seeking a highly skilled Senior Full-Stack TypeScript Engineer to lead the development of our media intelligence SaaS platform. This role involves taking ownership of a sophisticated application that leverages AI-powered agent workflows to provide deep insights into media coverage. You will play a crucial part in enhancing platform capabilities, resolving production issues, and integrating cutting-edge AI technologies., * Diagnose and resolve existing production issues, focusing on authentication, application services, and AI chat infrastructure.

 * Maintain and enhance an established full-stack TypeScript application.
 * Develop AI-powered features using LLMs and agent-based architectures to improve platform functionalities.
 * Customize and optimize streaming chat and AI runtime capabilities.
 * Integrate and manage LLM providers and AI services, ensuring seamless functionality.
 * Extend and maintain backend APIs, application services, and database logic to support platform growth.
 * Innovate and improve proprietary scoring, ranking, and analytics systems.
 * Develop efficient data ingestion and processing workflows for media and article-based datasets.
 * Enhance platform reliability, testing, and maintainability, ensuring long-term success.
 * Debug third-party library source code to address framework behavior challenges.
 * Translate product and business requirements into practical technical solutions.
 * Operate independently within an existing codebase, identifying opportunities for architectural improvements.