Site Builder Company (YC S13) - Sr Fullstack Developer

We're building the world’s leading AI-native Digital Experience Platform, and we’re doing it as a remote-first company built on trust, transparency, and a whole lot of creativity. This work takes grit, because we move fast, without ever sacrificing craft or quality. Our mission is to bring development superpowers to everyone. From entrepreneurs launching their first idea to global enterprises scaling their digital presence, we empower teams to design, launch, and optimize for the web without barriers. We believe the future of the web, and work, is more open, more creative, and more equitable. And we’re here to build it together.

We're expanding our engineering team in Argentina, where we’re establishing several teams across key product areas, including:

• Cloud: On this team, you'll be responsible for a new product that allows customers to deploy fully operational web apps, mounted on their hosted domains. You’ll be working in our Designer Dashboard to integrate the new features, and in our infrastructure that enables these features.

• e-Commerce: On this team, you’ll work closely with Product, Design, Engineering, and Data Engineering teams to contribute to the development of our next generation Ecommerce platform, working across a robust ecosystem of Ecommerce tools and products, and building a first-class customer experience.

You’ll have the opportunity to share your team preference during the interview process. Final placement will be confirmed once the interview process is complete.

About the role:

• Location: Remote-first (Argentina)

• Permanent

As a Senior Software Engineer, Fullstack, you’ll …

• Design, and implement scalable multi-tenant backend services and APIs.

• Work with technologies such as Node.js, Javascript/Typescript, MongoDB, GraphQL, Apollo, Amazon Web Services EC2, S3, Lambdas, Kafka, and more.

• Demonstrable experience and expertise in multiple technical domains.

• Contribute to building and executing on functional strategy.

• Lead projects that directly contribute to team and engineering organization's deliverables.

• Produce maintainable, tested, performant, and scalable code.

• Author, collaborate on, and evaluate design documents.

• Influence technical designs and team-level prioritization as well as participate in technical solutions.

• Collaborate with product managers and designers in an autonomous, supportive team environment.

• Mentor junior engineers in technical skills and culture.

• Participate in engineering citizenship activities such as co-authoring engineering blogs, strengthening and improving our hiring processes, and leading internal hackathon teams.

In addition to the responsibilities outlined above, we will support you in identifying where your interests and development opportunities lie and we'll help you incorporate them into your role.

Requirements:

• Business-level fluency to read, write and speak in English

• Have 5+ years developing and deploying web applications, with a proven track record of shipping code.

• Are familiar with Node.js and TypeScript and can write scalable services and APIs using Express.js, GraphQL, Apollo, and MongoDB.

• Can debug production issues across services and multiple levels of the stack.

• Have proven experience building complex web systems.

• Have used testing frameworks (e.g. Jest, Mocha, Playwright, Cypress).

• Are comfortable working in an agile, safe-to-fail, environment.

• Stay curious and open to growth — actively building fluency in emerging technologies like AI to unlock creativity, accelerate progress, and amplify impact.