Job description

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, and optimizing data pipelines. The ideal contractor should have strong expertise in developing machine learning algorithms, natural language processing (NLP), and experience working with large-scale data systems.

Scope of Services

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

Required Skills & Experience

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