Senior Software Engineer, Fullstack at Thrive Market in California

ABOUT THRIVE MARKET Thrive Market was founded in 2014 with a mission to make healthy and sustainable living easy and affordable for everyone. As an online, membership-based market, we deliver the highest quality healthy, and sustainable products at member-only prices, while matching every paid membership with a free one for someone in need. Every day, we leverage innovative technology and member-first thinking to help our over 1,700,000+ members find better products, support better brands, and build a better world in the process. We are also a Certified B Corporation, a Public Benefit Corporation, and a Climate Neutral Certified company. Join us as we bring healthy and sustainable living to millions of Americans in the years to come. THE ROLE At Thrive Market our ML team works closely with our Product Managers and Feature teams to enable experiences that define how our members shop, save, and stay loyal. This is a foundational hire for a team focused on enabling shopping powered by ML across our products; meaning you won't just be inheriting a slice of the product as it, you'll be redefining how ML turbo charges across its breadth. As a Senior Software Engineer, Fullstack, you'll operate across the full stack; from designing robust backend services that power the delivery of our ML systems all the way to delivering it through elegant frontend experiences. You'll also contribute to our PHP and Magento codebase and evolve those systems into the future. If you're energized by ambiguity, care deeply about how to empower customers through ML, and want your architectural decisions to actually matter; this is the role. RESPONSIBILITIES Design and implement scalable backend services and front end components that enable new customer experiences powered by AI-assisted shopping and site personalization Build and maintain frontend features in React and Next.js that are fast, accessible, and polished at every interaction. Work comfortably in our PHP/Magento codebase while actively contributing to its modernization.. Decompose legacy monolithic systems into maintainable, horizontally scalable service oriented architectures where it makes sense. Apply strong software development principles and practice test-driven development from the start; unit tests, integration tests, and meaningful observability are table stakes here. Collaborate closely with Product, Design, and Data in the Product Triad model; translating business problems into technical specs and realistic sprint goals. Instrument new services with meaningful metrics; own the SLAs for what your pod ships. Elevate the team through thoughtful code review, architectural discussions, and documentation of best practices. Work with cross-functional partners to diagnose and resolve production issues and restore system health quickly. QUALIFICATIONS 5+ years of hands-on experience in full-stack development, with meaningful time across both the web and backend stack. Strong proficiency in backend systems and languages such as Python, Java, PHP or similar Proficiency with React.js, TypeScript, and Next.js; solid understanding of SSR, ISR, SSG, and CSR tradeoffs. Experience building and maintaining REST and RPC APIs and services at scale. Familiarity with relational and non-relational databases; understands when to use which and why. Working knowledge of AWS services (Lambda, S3, CloudWatch, etc.) and serverless patterns. Experience with observability and monitoring tools (New Relic, Datadog, or similar) to maintain SLA and error rate targets. Comfort working in and improving legacy codebases; you don't need a greenfield project to do your best work. Strong communication skills; can articulate tradeoffs clearly and influence architectural decisions across teams.JO Experience with agile development, CI/CD pipelines, and collaborative Git workflows. NICE TO HAVE Familiarity with ML operations and infrastructure. E-commerce experience. Direct experience with Magento or similar e-commerce platforms. Strong Proficiency in PHP. Familiarity with Kafka or similar event based messaging systems. High-traffic consumer-facing product experience. Experience with A/B testing and feature flagging tools (Optimizely, LaunchDarkly). BELONG TO A BETTER COMPANY Comprehensive health benefits (medical, dental, vision, life and disability) Competitive salary (DOE) + equity 401k Employer Match 9 Days of Observed Holidays Flexible Paid Time Off Subsidized ClassPass Membership with access to fitness classes and wellness and beauty experiences Ability to work in our beautiful office in Playa Vista Free Thrive Market membership with exclusive employee discount Coverage for Life Coaching & Therapy Sessions on our holistic mental health and well-being platform We're a community of more than 1 Million + members who are united by a singular belief: It should be easy to find better products, support better brands, make better choices, and build a better world in the process. At Thrive Market, we believe in building a diverse, inclusive, and authentic culture. If you are excited about this role along with our mission and values, we encourage you to apply. Thrive Market is an EEO/Veterans/Disabled/LGBTQ employer At Thrive Market, our goal is to be a diverse and inclusive workplace that is representative, at all job levels, of the members we serve and the communities we operate in. We’re proud to be an inclusive company and an Equal Opportunity Employer and we prohibit discrimination and harassment of any kind. We believe that diversity and inclusion among our teammates is critical to our success as a company, and we seek to recruit, develop and retain the most talented people from a diverse candidate pool. If you’re thinking about joining our team, we expect that you would agree! If you need assistance or accommodation due to a disability, please email us at eoe@thrivemarket.com and we’ll be happy to assist you. Ensure your Thrive Market job offer is legitimate and don't fall victim to fraud. Thrive Market never seeks payment from job applicants. Thrive Market recruiters will only reach out to applicants from an @thrivemarket.com email address. For added security, where possible, apply through our company website at www.thrivemarket.com. © Thrive Market 2026 All rights reserved. JOB INFORMATION: Compensation Description - The base salary range for this position is $160,000 - $190,000/Per Year. Compensation may vary outside of this range depending on several factors, including a candidate’s qualifications, skills, competencies and experience, and geographic location. Total Compensation includes Base Salary, Stock Options, Health & Wellness Benefits, Flexible PTO, and more!