Senior Software Engineer

Loop is a commerce operations technology company that helps merchants manage returns, exchanges, order tracking, fraud prevention, and related commerce workflows. The Senior Software Engineer will own complex cross-functional work from architecture and design through production, build scalable full-stack solutions, guide technical direction, and mentor other engineers while establishing effective AI-assisted engineering practices.

Responsibilities:

• Design and implement complex, high-quality features across the full stack: backend services, APIs, lambdas, and frontend. Translate ambiguous requirements into clear technical designs and own the trade-offs
• Start with the agent, not the editor. Invest time in planning and intent articulation. The quality of your prompt is the quality of your output
• Review AI-generated code with the same rigor you'd apply to any code. Plausible is not the same as correct. At this level, you're also setting the standard for how your team does this
• Set the standard for AI-assisted code review on your team. Model what good verification looks like, not just for your own PRs, but in how you give feedback on others' AI-generated work
• Lead small to medium-sized technical initiatives: provide direction, surface dependencies early, and keep stakeholders informed without being asked
• Mentor and develop more junior engineers through code review, pairing, and direct feedback. Making the people around you better is part of the job, not a bonus
• Make reversible decisions fast and flag the irreversible ones early. Operational trust means others can plan around your delivery
• Make the system around you more effective, not just your own output. Propose improvements to code quality, processes, and team norms, and follow through on them

Requirements:

• 5+ years building web applications, backend services, and APIs
• You use AI agents as your default starting point and can describe your actual workflow: how you plan, prompt, evaluate output, and decide where to spend your review time. You own what ships, regardless of how it was generated
• You have a point of view on where AI helps and where it gets engineers into trouble, and you actively help your team navigate that line
• You track how your code behaves in production, not because someone asks you to, but because you own the outcome. You've caught regressions before support tickets did
• You can evaluate architectural trade-offs and make defensible decisions, not just implement what you're handed
• You have examples of leading technical initiatives, mentoring engineers, and driving cross-functional alignment
• You operate with intensity and hold a high bar for your own work and for the people around you. You give direct feedback, ask for help early, and respond to setbacks with ownership rather than withdrawal
• You've worked closely with product managers and design teams, and you've had the hard conversations with peers, stakeholders, or leaders, with directness and care
• Strong PHP/Laravel experience