Senior Full Stack Engineer (JavaScript / TypeScript)

Location: Remote (LATAM)

Employment Type: Full-Time Contractor

Company: IT Tech Hub

About the Opportunity

IT Tech Hub is partnering with an innovative US-based startup to expand its engineering team.

We're looking for a Senior Full Stack Engineer who is passionate about building products from the ground up and enjoys working in fast-paced startup environments.

You'll join a small team of experienced engineers, collaborating on the design and development of an AI-powered platform. This is an opportunity for someone who enjoys solving complex technical challenges, taking ownership, and contributing to both product and technical decisions.

What You'll Do

• Build and maintain scalable full-stack applications using modern JavaScript and TypeScript technologies.

• Develop high-quality frontend experiences using React and Next.js.

• Design and implement scalable backend services using Node.js.

• Build AI-powered features using Large Language Models (LLMs) and modern AI APIs.

• Integrate AI capabilities into production applications using providers such as OpenAI, Anthropic, or Gemini.

• Design APIs and scalable software architectures.

• Collaborate with product and engineering teams to transform ideas into production-ready features.

• Optimize application performance, scalability, and reliability.

• Participate in architectural discussions and technical decision-making.

• Write clean, maintainable, and well-tested code.

Required Qualifications

• 7+ years of experience as a Full Stack Software Engineer.

• Expert-level JavaScript and TypeScript.

• Strong experience with React and Next.js.

• Strong backend experience with Node.js.

• Hands-on experience building AI-powered applications.

• Experience integrating LLMs such as OpenAI, Anthropic, Gemini, or similar.

• Experience working with AI SDKs, prompt engineering, AI workflows, or AI agents.

• Experience designing REST APIs and scalable web applications.

• Experience building SaaS products.

• Strong understanding of software architecture and engineering best practices.

• Experience working in startup or fast-paced environments.

• Excellent problem-solving skills and ownership mentality.

• Professional English communication skills.

Nice to Have

• NestJS

• Python

• LangChain

• LangGraph

• Model Context Protocol (MCP)

• Retrieval-Augmented Generation (RAG)

• AI Agents

• Vector Databases (Pinecone, Weaviate, pgvector, Qdrant)

• PostgreSQL

• Docker

• AWS

• CI/CD

What We're Looking For

We're looking for engineers who:

• Enjoy building products from scratch.

• Have a strong product mindset.

• Take ownership and work autonomously.

• Are comfortable making technical decisions.

• Thrive in startup environments.

• Are excited about building AI-native products.

• Enjoy collaborating with highly technical teammates.

Why Join?

• Work with a fast-growing US startup.

• Fully remote position.

• Full-time contractor role.

• High-impact engineering work.

• Opportunity to help build an AI-first product from an early stage.

• Collaborative, senior-level engineering team.

• Long-term opportunity.