Remote Full-Stack Builder for AI-First Startup

Katapult Labs; United States; Remote; USD 112,000 - 156,000; Full time

Benefits offered by this job

Work from Anywhere in LATAM

23 Days PTO per Year

USA Federal Holidays

Monthly Payment in USD

Contractor Agreement with No End Date

Job summary

Katapult Labs is seeking a Full-Stack Builder to join the founding technical team. You will assess and harden the partner’s existing web platform, refactor code for rapid iteration, and deliver end-to-end features with UX-focused functionality.

This role centers on fast delivery, light architectural work, and close collaboration with founders and a product-minded team. There is potential to extend into mobile development as the roadmap evolves.

Qualifications

• 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.

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.

Skills

Full-stack engineering

Frontend development

Backend development

Web technologies

Code refactoring

Product analytics tooling

AI coding tools

Communication skills

Advanced English

Tools

Amplitude

PostHog

Job description

Katapult Labs is seeking a Full-Stack Builder to join the founding technical team. You will assess and harden the partner’s existing web platform, refactor code for rapid iteration, and deliver end-to-end features with UX-focused functionality.

This role centers on fast delivery, light architectural work, and close collaboration with founders and a product-minded team. There is potential to extend into mobile development as the roadmap evolves.