Senior Full-Stack AI Engineer: Build Agentic AI Fast

Silversmith Capital Partners; 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. We ship AI-powered features that help customers succeed and experiment with agentic systems daily.

As a senior engineer, you will design and ship full-stack features, review AI-generated code for production-grade quality, and set architectural direction. This role collaborates with product managers and cross-functional teams in a hybrid, Boston-based environment.

Qualifications

• 10+ years of engineering experience shipping products.
• Deep full-stack experience with React, Next.js, TypeScript, PostgreSQL.
• 2+ years building agentic AI systems.
• Demonstrated ability to work across multiple projects simultaneously, leveraging agents to multiply output.
• Strong code review skills with the judgment to maintain high quality in an AI-assisted development environment.
• Strong product sense – you understand the product and what users want.
• Excellent systems design – you architect for clarity, maintainability, and scale.
• Bias toward action and rapid decision-making.

Responsibilities

• Build and ship full-stack features quickly.
• Design and deploy agentic AI systems.
• Work across multiple projects simultaneously, using agents to maintain velocity.
• 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.

Skills

React

Next.js

TypeScript

PostgreSQL

Agentic AI

Full-stack development

Code review

Systems design

Product sense

Bias toward action

Job description

Validity is building the next generation of email marketing tools with AI at the core. We ship AI-powered features that help customers succeed and experiment with agentic systems daily.

As a senior engineer, you will design and ship full-stack features, review AI-generated code for production-grade quality, and set architectural direction. This role collaborates with product managers and cross-functional teams in a hybrid, Boston-based environment.