About Katapult Labs
Katapult is an AI-first engineering studio connecting senior LATAM talent with startups and companies in the US. We're not a staff-augmentation shop: every person we put in front of a client represents Katapult, co-creates product, and owns the outcome directly, with no managers or leads acting as a layer in between.
The Role
We're looking for a Full-Stack Builder to join the founding technical team behind one of our partners, an early-stage product with big ambitions to become a real tech company: web platform, mobile app, and everything in between. Our partner already has a first version of their site live, built by a non-technical founding team full of product ideas. We need someone who can step in, understand and harden the existing architecture, refactor where needed, and help seed the technical process for building product going forward.
This is a builder role, not a heavy-architecture or platform-engineering seat. You'll move fast, ship with sufficient quality, and work closely with a product-minded team that cares deeply about user experience and engagement. Mobile development isn't required from day one, but the team expects to build a mobile app down the line, so comfort picking that up matters. If the engagement goes well, this grows into a two-builder team supporting the full platform.
Key Responsibilities
Understand and evaluate the current architecture of our partner's existing web platform
Refactor and harden the codebase to support rapid, reliable iteration
Build new features end-to-end, working closely with the product lead on UX and engagement-focused functionality
Help establish lightweight technical processes (code review, deployment, documentation) as the team scales
Collaborate directly with a technical product manager and design lead in a fast-moving, startup environment
Be ready to extend work into mobile development as the product roadmap evolves
Requirements
Advanced conversational English, since all collaboration happens in English
Strong full-stack engineering experience with modern web technologies (frontend and backend)
Demonstrated ability to work as a builder: shipping fast, with just enough architecture, not over-engineering
Comfort working directly with founders and non-technical stakeholders, translating product vision into working software
Experience refactoring or hardening an existing early-stage codebase
Product analytics tooling (Amplitude, PostHog, or similar)
Agentic mindset: comfortable using AI coding tools (Cursor, Claude Code, etc.) as part of daily workflow
Strong communication skills, comfortable asking clarifying questions and flagging blockers early
Nice to Have
Prior experience building consumer-facing (B2C) products with high user engagement
Mobile development experience (native or cross-platform)
Experience working in a 0-to-1 startup environment alongside a small, fast-moving team
Work-Life Balance
Work from Anywhere in Latin America: Enjoy the freedom to work remotely from any country in Latin America.
23 Days of PTO per Year: Take time to recharge with paid time off, accrued monthly (1.91 days/month).
USA Federal Holidays
Financial Benefits
Monthly Payment in USD: Get paid in US dollars, no matter where you are.
Contractor Agreement with No End Date: Enjoy the stability of a long-term contract.