Senior Software Engineer, Full Stack - Postscript

Postscript is the AI messaging platform trusted by 20,000+ Shopify brands — including Brooklinen, Ruggable, True Classic, and Dr. Squatch. Backed by Greylock and Y Combinator, we have been fully remote since 2018.

As a Senior Software Engineer at Postscript, you will be a high-ownership contributor to one of our core product or platform teams — owning meaningful systems end-to-end, driving technical quality, and helping shape engineering standards across the organization. Our engineering teams operate at the intersection of scale and product velocity, working on distributed systems while embedding AI-first development workflows.

This position is fully remote and open to candidates based in the US or Canada.

Primary Duties

• Take deep ownership of systems and product areas on your team, becoming the go-to technical expert for what you own.
• Independently investigate, design, and execute solutions across distributed systems with a high degree of ambiguity.
• Architect, build, and maintain highly available, scalable REST APIs and backend services for internal and external use.
• Drive system decoupling, modularization, and technical debt reduction to improve maintainability without blocking near-term delivery.
• Build agentically as your default: leverage concurrent autonomous agent workflows, own output, and keep work moving efficiently.
• Stay at the forefront of emerging AI tooling and practices, bringing new techniques back to the team.
• Collaborate cross-functionally with product, data, and go-to-market teams in an async-first environment.
• Identify and eliminate single points of failure to improve system resilience and team knowledge redundancy.
• Improve internal engineering workflows, tooling, and developer utilities.

What We'll Love About You

• 6+ years of experience building large-scale backend systems and APIs.
• Active daily user of AI coding tools (Claude Code, Cursor, Copilot, etc.) to maximize output, and able to speak concretely about how they enhance your workflow.
• Strong technical proficiency across Python, Go, React, and TypeScript.
• Experience with Kubernetes, AWS, Datadog, and both relational and NoSQL databases.
• Deep understanding of AI tooling, model releases, and emerging agentic workflows, coupled with a critical eye for AI output verification.
• Proven ability to balance 0-to-1 initiatives with complex existing systems.
• Strong database modeling and SQL fundamentals.
• Clear, proactive async communication and strong instincts for technical tradeoffs.

What You'll Love About Us

• Salary range of USD $175,000–$205,000 base plus significant equity (no geo-based pay tiering).
• Fully remote environment with high autonomy.
• Flexible paid time off.
• Comprehensive health, dental, and vision insurance.
• High-growth startup setting with direct business impact.