We are seeking to hire a skilled Contract Sr. Machine Learning Engineer based out of Argentina, Brazil, Colombia, Chile, Costa Rica, or Mexico. This role will focus on developing machine learning algorithms, data analysis, & optimizing data pipelines. The ideal contractor should have strong expertise in developing machine learning algorithms, natural language processing (NLP), & experience working with large-scale data systems.

Scope of Services

• Build & maintain a scalable iOS application using React Native with deep WebView integration (navigation, cookie/session handling, file downloads, media, & safe JS/native bridging).
• Work closely with backend & frontend developers, product managers, & designers to refine requirements; proactively identify native gaps vs. the web experience.
• Own delivery of features & enhancements end-to-end (requirements, implementation, tests, CI/CD, release notes) with minimal oversight.
• Contribute to ticket grooming, sprint planning, & architecture/design discussions & documentation
• Ensure accessibility, responsiveness, & adherence to modern FE/RN best practices.
• Leverage AI/LLM-powered workflows & code-generation tools (e.g., Copilot, Cursor) to stay efficient & productive, with code reviews to ensure quality & security.
• Debug end-to-end issues across APIs, auth flows, data integrations, & frontend performance.
• App Store compliance with 4.2 (Minimum Functionality) & related iOS requirements. 
• Keep the application compliant with the relevant Apple policies as the policies change over time.
• Release engineering & app deployments
• Legacy native iOS app: triage & ship critical fixes & security updates; create a deprecation/transition plan (migration guides, deep link parity).
• Future contribution to React web app: collaborate on shared components, accessibility, responsiveness, & WebView-compatibility contracts.

Required Skills & Experience

• 5+ years building modern web & mobile applications in a SaaS environment, with significant React/React Native iOS experience.
• Expert-level React.js & React Native (functional components, hooks, context, navigation, animations, RN performance patterns).
• Strong JavaScript & practical TypeScript proficiency & familiarity with native iOS concepts
• Experience with React Native WebView: auth redirects, cookies, content injection, file/media, native navigation, push notifications, & similar.
• Demonstrated ability to work with REST APIs, data relationships, & caching strategies.
• Comfort using AI-assisted coding tools (Copilot, Cursor, Codeium) responsibly with security & license awareness.
• Strong communication & collaboration skills with a track record of independent delivery & crisp, solution-oriented documentation.
• App Store Readiness & Compliance:
  • Experience shipping to App Store: TestFlight, review notes, phased release, responding to rejections.
  • Working knowledge of App Store Review Guideline 4.2 & adjacent policies.
  • Ability to design features that clearly exceed website-in-an-app thresholds. Examples: native integrations, offline capability, iOS UI, device features.

Please note that given the nature of the contract, this role will not be eligible to participate in company-sponsored benefits.