Senior Full-Stack AI Engineer (Agentic Systems)

Validity; Boston (MA); Hybrid; USD 200,000 - 220,000; Full time

Job summary

Validity is building the next generation of email marketing tools with AI at the core. This role focuses on shipping AI-powered features and agentic systems that help customers succeed, combining fast iteration with strong engineering practices.

You will design, implement, and review full-stack features across multiple projects, collaborate with product teams, and push for production-grade quality and scalable architectures.

Qualifications

• 10+ years of engineering experience shipping impactful products.
• Deep full-stack experience with React, Next.js, TypeScript, and PostgreSQL.
• 2+ years building agentic AI systems.
• Ability to work across multiple projects simultaneously using agents to multiply output.
• Strong code review skills to maintain high quality in an AI-assisted development environment.
• Strong product sense and understanding of user needs.
• Excellent systems design for clarity, maintainability, and scale.
• Bias toward action and rapid decision-making.

Responsibilities

• Quickly build and ship full-stack features.
• Design and deploy agentic AI systems that solve real user problems.
• Work across multiple projects simultaneously, using agents to maintain velocity and context across concurrent workstreams.
• Perform rigorous code review – especially of AI-generated code – ensuring production-grade quality, security, and systems design.
• Set technical direction through architecture decisions, prototypes, and rapid experimentation.
• Help define and improve evaluation for agent-powered features.
• Move from idea to production-ready implementation at speed.
• Work closely with product managers, shipping, learning, and iterating.

Tools

React

Next.js

TypeScript

PostgreSQL

Job description

Validity is building the next generation of email marketing tools with AI at the core. This role focuses on shipping AI-powered features and agentic systems that help customers succeed, combining fast iteration with strong engineering practices.

You will design, implement, and review full-stack features across multiple projects, collaborate with product teams, and push for production-grade quality and scalable architectures.