Founding Engineer

REPLO; San Francisco, Northern (CA, KY); Hybrid; USD 180,000 - 300,000; Full time

Job summary

REPLO is seeking a full-stack founding engineer in San Francisco to architect and ship features using Typescript, React, and Node. You will build sandbox infrastructure, an analytics platform, and public APIs for integrations (e.g., Slack).

The role emphasizes delivering operating products with a customer-centric mindset and minimal planning cycles. Ideal candidates have built 0→1 products with real users and revenue, are comfortable working independently without heavy product/design

Qualifications

• Proficient in Typescript/React/Node.
• Ability to ship features with product focus.
• Experience building products from 0→1 with real users and revenue.

Responsibilities

• Architect and implement full-stack features using Typescript/React/Node.
• Build sandbox infra for agents, including secrets, proxies, and compute.
• Launch analytics platform on ClickHouse/MSK handling millions of events daily.
• Develop public API for Replo/Slack bots.
• Overhaul billing to support usage-based pricing.

Skills

Typescript

React

Node

Education

CS degree

Tools

Cursor

Claude Code

Job description

About the role

Hiring a full-stack/founding engineers to join our team and focused on product engineering and shipping new features

Things you'll be working on

Architecting and implementing full-stack product features in Typescript/React/Node is the core of what you’ll be doing. Real examples include —
Platform

• Building sandbox infrastructure for our agents (managing secrets, proxies, and compute)

• Building an eval framework for our models

• Launching an analytics platform on ClickHouse/MSK that consumes millions of events per day

• Building an agentic workflow orchestration architecture

• Building a public API for Replo/Slack bots

• Overhauling our billing system to support arbitrary usage-based billing

Programs

• Enabling customers to buy domains directly through Replo

• Building agent-driven insight reporting for businesses

• Building a full product-customizer UI for custom print-on-demand products

Looking for someone who

• Can be in office 4-5 days/week in San Francisco

• Is proficient in Typescript/React/Node

• Uses Cursor/Claude Code 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

• Has experience being burned by deployment and maintenance issues. If you have a a strong opinion on how products should be built, that’s good

• 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

• Have a CS degree or formal computer science/STEM backend

• 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).