Senior Software Engineer, Marketing Technology

Senior Staff Software Engineer, Marketing Technology

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At Gusto, we’re on a mission to grow the small business economy. We handle the hard stuff—like payroll, health insurance, 401(k) s, and HR—so owners can focus on their craft and customers. With teams in Denver, San Francisco, and New York, we’re proud to support more than 400,000 small businesses across the country, and we’re building a workplace that represents and celebrates the customers we serve.

Gusto is a modern, online people platform that helps small businesses take care of their teams. On top of full‑service payroll, Gusto offers health insurance, 401(k) s, expert HR, and team management tools. Today, Gusto offices in Denver, San Francisco, and New York serve more than 200,000 businesses nationwide.

Our mission is to create a world where work empowers a better life, and it starts right here ’re committed to building a collaborative and inclusive workplace, both physically and virtually.

As a Senior Staff Software Engineer on the Marketing Technology team, you will spearhead the architectural evolution of Gusto’s new Mar Tech stack as we transition to an AI‑native company. This is a frontend‑leaning architecture role where you will be instrumental in designing and building the foundational web platforms that connect our customer data with our communication channels.

Your work will focus on transforming our Headless CMS from a content repository into an AI‑driven personalization engine
, architecting the high‑performance frontend systems that can reason about customer data, predict user intent, and serve the most relevant experience. You will design how these platforms intelligently integrate with our central CDP and multi‑channel orchestration engine, turning backend insights into adaptive, personalized user journeys.

You’ll operate at the intersection of marketing systems, AI capabilities, and platform evolution. If you are passionate about building highly reliable, frontend‑focused systems that can reason, predict, and personalize to unlock Gusto’s next phase of sustainable growth, we would love to have you join our team.

The Marketing Technology (Mar Tech) team is building the next generation of infrastructure that powers customer acquisition and engagement funnels.

Our mission is to move beyond deterministic user journeys and build intelligent growth systems. We’re building a world‑class technology platform designed to understand customer intent, tailor experiences in real‑time, and continuously improve through data and feedback. This means shifting from static tools to an adaptive platform that ensures a seamless, personalized, and performant experience for prospects and customers.

We prioritize quality, observability, and uptime because these intelligent systems are fundamental to Gusto’s growth and brand. We partner closely with Marketing, Sales, Growth R&D, and Operations to build and connect the AI‑powered tools they use every day.

• Architect and evolve our customer‑facing web platforms not just for performance and scale, but for AI‑driven personalization and intelligent experimentation.
• Build and maintain integrations with our Mar Tech stack (Segment, Braze, etc.) to create feedback loops for AI models and enable model‑driven actions.
• Implement and optimize caching strategies across our delivery stack (CDN, edge).
• Write high‑quality, well‑tested frontend code leveraging AI‑powered tools and techniques to accelerate development, improve test generation, and ensure code reliability.
• Support, mentor, and up‑level fellow engineers on the team, helping to establish best practices for AI‑native design patterns.
• Partner cross‑functionally with Marketing and Sales to translate business needs into technical solutions.
• Be an owner of the long‑term technical roadmap for Mar Tech, ensuring it aligns with Gusto’s transition to an AI‑native company.

• 12+ years of experience building web systems connected to a headless CMS.
• Curiosity and ability to operate in an…