Senior Software Engineer - Python/React (LATAM, Remote)

We're hiring a Senior Software Engineer for an early-stage, US-based AI software company. You'll own large product features end to end, from a loosely defined spec to production, on a small team that ships fast while the product finds its market. This is a full-time, fully remote role on US Pacific hours.

What you'll do

• Turn large, loosely defined product specs into technical plans, milestones and shipped code
• Build across the stack: Python and FastAPI on the backend, React and TypeScript on the frontend
• Design data models across BigQuery (SQL) and Firestore (NoSQL)
• Push toward higher automation rates for customers, so the product does more of the work for them
• Surface issues early, take initiative and own your projects from design through production
• Get your engineering plans reviewed and signed off by the team, and bring product questions to leadership
• Use AI coding tools in a disciplined workflow, while fully understanding the code you ship
• Join the on-call rotation and keep production healthy

You may be a fit if

• You have senior-level experience owning large, ambiguous scopes from spec to production
• You write strong production Python, ideally with FastAPI or Flask, and work comfortably in React and TypeScript
• You model data well across relational/analytical and NoSQL databases
• You've built systems that grew in users, traffic or data, and you design for scale
• You operate autonomously and proactively, raise problems before they grow, and are reliable on deadlines
• You use AI tools daily and review their output carefully
• You're energized by fast iteration and comfortable when an experiment fails and the plan changes
• You're fluent in English and communicate well in writing, in an async-first team
• You can work 9 AM to 6 PM US Pacific Time
• You're based in Latin America (Mexico and Central America preferred for time zone overlap)

Nice to have

• Early engineer at a startup that grew significantly while you were there
• Founder or founding engineer experience or BigTech experience
• Shipped AI features: LLM integrations, chatbots, agents or support automation
• Experience with SMB-focused SaaS, payments or commerce

What we offer

• Full-time, fully remote, long-term role (independent contractor)
• Real ownership on a small, senior team with no project managers or process overhead
• A flexible day: no time tracking, you're judged on what you ship
• Direct work with the company's leadership