Senior Software Engineer

SamCart builds and scales online businesses through an AI-first platform for creators. The Senior Software Engineer will take loosely defined problems from design through production, make architecture decisions across PHP and React systems, review AI-generated code, and improve engineering workflows and tooling.

Responsibilities:

• Take a problem from a loose brief to shipped and stable. You own the design, the review, and the outcome, with AI doing the majority of the coding
• Make architecture calls in a mature PHP codebase and a React/Next.js front end — where to extend, where to refactor, and where to leave well enough alone
• Review AI output the way a senior engineer reviews a junior's PR: fast, skeptical, and specific. Catching where the model is confidently wrong is core to the job
• Own your work in production. You ship it, you watch it, you fix it
• Improve how the team builds — the AI workflows, our MCP tooling, and the tests that make agent-written code safe to merge

Requirements:

• 6+ years building and shipping production web applications
• several of them at a senior level
• Deep expertise in at least one domain or system
• You've been the person others came to, and you can explain the tradeoffs behind how it was built
• Architecture-capable, execution-biased
• You can whiteboard the right long-term system, then ship the pragmatic version now and explain the tradeoff you made
• AI-native
• You use Claude daily like a teammate, and you're just as comfortable catching where it's wrong
• You raise the bar around you through mentoring, teaching, and improving how the whole team builds
• Full-stack, and comfortable in someone else's codebase
• Real systems have history
• You can tell what's merely ugly from what's actually wrong
• Located on the East Coast (US), ideally in or near Charleston, SC
• East Coast (US) required
• we aren't hiring outside those regions for this role
• Charleston, SC preferred
• PHP/Laravel and React/TypeScript, AWS, e-commerce or payments experience, hands-on work with agent or MCP tooling, or time as one of the first engineers at a startup