Senior Software Engineer (Full-Stack) at Replo (S21) Sell anything San Francisco Full-time US citizen/visa only About Replo Replo is the commerce platform for the AI age. The web continues to be the most profitable customer acquisition channel for selling goods and services. Over the past two decades, SaaS products like Squarespace and Shopify have dominated online commerce. They've made it easier to set up an online store, but at their core, they're just CRUD apps built on top of payment processors. You still have to design and build the shop, make ads, write copy, analyze data, and keep iterating until you find a channel that works. This often means spending millions on design, development, marketing, copywriting, ad buying, and more. What if all this could be done for you? Replo designs and launches your shop and entire marketing campaign, and within a few days provide data about what you should change. We are building an ecommerce specialist in everyone's pocket. Tell us what you're selling, and we will sell it for you — whether that's Tums during the Super Bowl (we did this!) or United Airlines tickets to Tahiti. To date, we’ve raised over $8.2M from Figma, YCombinator, Vercel, General Catalyst, Infinity Ventures, MAGIC Fund, Base Case Capital. We grew from 5 to over 3000+ customers in less than 18 months. We're headquartered near Union Square in San Francisco. About the role About the role Hiring a senior full-stack engineer to join our team and focused on product engineering. As a senior engineer at Replo, you will play a pivotal role in both shaping core product architecture and driving end-to-end feature development that directly impacts hundreds of thousands of users. You’ll start as a senior contributor working on core products including our AI platform, inventory, checkout, analytics, and integration with 3rd-party providers. You’ll own these critical product surfaces end-to-end, from architecture to deployment, with no layers of management in between. As Replo grows, so will your scope. You’ll set technical direction, mentor engineers, and define best practices across the team. If you’re interested, this can evolve into managing projects and eventually teams, while shipping great products and staying close to the code. Responsibilities Lead and grow a team of exceptional engineers, providing mentorship and guidance to help them succeed and thrive. Deeply understand customer needs and pain points to prioritize work and deliver solutions that drive real impact. Own project execution end-to-end — planning, architecture, and delivery — while maintaining high quality and predictable timelines. Collaborate with high-visibility teams and stakeholders to drive critical product and platform initiatives forward. Provide hands-on technical leadership, from system architecture and design to incident response and roadmap definition. Work every day with founders to shape and execute on the long-term vision for Replo's AI platform. Partner with our Chief of Staff to attract top-tier engineering talent and define hiring strategies as the team scales. Things you'll be working on Architecting and implementing full-stack product features. Real examples include — Enable merchants to sell anything, anywhere, including subscriptions, dropshipping, and digital products in one platform Build agentic workflows that design and build online shops for anyone, from SaaS startups to M&Ms Build out product & payments processing infrastructure for millions of users Ingest billions of events/month using Kafka + ClickHouse, powering real-time dashboards and automating marketing strategies Own our user onboarding and billing flow from end-to-end Minimum requirements Has a CS degree (or equivalent) Can be in office 3-4 days/week in San Francisco 7+ years of professional experience in software development Experience leading projects on a cross-team or company-wide scale Uses Cursor/Windsurf/GPT to accelerate their work Has built products 0 -> 1 with real users and revenue Is OK operating independently without product/design Is ALWAYS SHIPPING. We don't spend weeks planning features at Replo Has a product and customer-focused mindset Values writing clean, maintainable software, including documentation (e.g. the code needs to be correct and run fast, but we’re the ones that have to read it and understand it) Is comfortable with ambiguity and defining software architecture patterns to solve customer pain points Bonus points if you Experiencing managing teams in a people/technical capacity Have started a company before Enjoy attending hackathons Worked at an early-stage (Series A or earlier) startup previously Have not wasted hours interview-prepping on Leetcode Have an eye for visual design (or past experience in product design, Figma, etc). Technology We use Typescript/Node/React aggressively. We deploy on Fly.io and Vercel. If you hate Leetcode as much as we do, let's chat.