[Remote] Senior Software Engineer, Full Stack

Note: The job is a remote job and is open to candidates in USA. Postscript is the AI messaging platform trusted by over 20,000 Shopify brands, aiming to make SMS the top revenue-driving channel. They are seeking a Senior Fullstack Engineer to take ownership of systems, drive technical quality, and influence the organization's building standards while working with AI-driven development tools.ResponsibilitiesTake deep ownership of systems and product areas on your team — becoming the go-to technical expert for what you ownIndependently investigate, design, and execute solutions across distributed systems with a high degree of ambiguityArchitect, build, and maintain highly available, scalable REST APIs and backend services for internal and external useDrive system decoupling, modularization, and technical debt reduction — improving long-term maintainability without blocking near-term deliveryBuild agentically as your default: run multiple autonomous agents and worktrees in parallel (5+ is the benchmark), own the output, and keep a steady queue of aligned work movingStay at the forefront of emerging AI tooling and practices, bringing new techniques back to the team and helping raise the floor for how Postscript engineers workContribute to how we think about integrating AI into our systems and workflows — not just using AI tools, but helping shape where and how AI creates leverage across the engineering orgCollaborate cross-functionally with product, data, and go-to-market teams — communicating clearly and proactively in an async-first environmentIdentify and eliminate single points of failure, improving system resilience and knowledge redundancy across your teamImprove how engineering gets done: bring better tools, fix workflow friction, build internal utilities when the leverage compoundsSkills6+ years of experience building large-scale backend systems and APIsYou are an active, daily user of AI coding tools and are using them to maximize your output — Claude Code, Cursor, Copilot, or equivalent — and can speak concretely to how they've changed your output and your workflowTech stack: Python, Go, React, and TypeScript; experience with Kubernetes, AWS, Datadog, and relational/NoSQL databasesYou follow the AI tooling landscape closely: new model releases, emerging agentic workflows, and evolving best practices aren't things you catch up on eventually — they're things you're tracking in real timeYou think critically about AI output — you know where it accelerates you, where it introduces risk, and how to verify what it producesYou are able to context switch extremely quickly across concurrent workstreamsExperience working on both 0-to-1 initiatives and complex existing systems — and knowing how to balance building new things with improving what's thereStrong command of relational and NoSQL databases, SQL, and thoughtful database modelingFamiliarity building and observing applications on AWS, and ideally with Datadog or comparable observability toolingClear, direct communication — cross-functional partners and async teams can count on you to surface information proactivelyStrong instincts for technical tradeoffs informed by both engineering best practices and business prioritiesBenefitsSignificant equityWork from home (or wherever)Flexible paid time offHealth, dental, vision insuranceCompany OverviewPostscript is an SMS platform that enables brands to communicate and engage with customers through text message marketing. It was founded in 2018, and is headquartered in Scottsdale, Arizona, USA, with a workforce of 201-500 employees. Its website is https://www.postscript.io.