We are looking for a Senior Front-End Engineer with strong experience in React for web and solid hands-on expertise with React Native for iOS and Android. You won't just build features—you'll take ownership of the entire mobile product experience, from architecture and performance to user behavior and conversion strategy.

You'll work closely with the CEO, Tech Lead, and a highly engaged engineering team to guide architectural decisions, deliver features that matter, and continuously improve stability and usability across web and mobile. You'll bring data-driven insights from analytics, diagnose product friction before users complain, and contribute strategic ideas on what to build next.

This is a role where technical excellence meets product thinking.

What You'll Do

- Build and maintain high-quality applications using React and Next.js for web, React Native for iOS and Android.
- Ship improvements quickly across both platforms, ensuring fast load times, smooth navigation, and polished user experience.
- Own performance monitoring and product health. Monitor app performance and user behavior using PostHog analytics; identify conversion bottlenecks, retention issues, and UX friction before they become problems.
- Diagnose product issues with data. When metrics drop or adoption is lower than expected, you'll investigate technical causes, UX problems, and funnel breakpoints—then recommend solutions backed by data.
- Work on performance optimization, SSG/SSR strategies, routing, component architecture, and best practices as the product scales.
- Integrate APIs effectively. Work with REST and GraphQL APIs with solid handling of state, caching, error recovery, and real-time updates.




- Contribute to product strategy by suggesting improvements based on user behavior, feature adoption rates, session recordings, and performance data.
- Participate actively in sprints: two-week cycles, daily standups, and regular check-ins with the CEO and team.
- Take ownership of "done." Features are complete when they're released, monitored in production, and validated to be working as expected through PostHog analytics and user behavior.
- Write and maintain automated tests to ensure reliability and maintainability across both web and mobile.

You'll Bring

- Ownership mentality: you care about the entire mobile experience, not just shipping code. You understand how your work impacts users and the business.
- Product curiosity: you actively look for UX friction, performance issues, and conversion problems. You've identified product issues without being asked to look for them.
- Analytics comfort: you can navigate PostHog (or similar tools), understand funnels and retention, pull session recordings, and use data to diagnose problems and prioritize improvements.
- Strategic thinking: when faced with 20 possible improvements but only time for five, you can prioritize with conviction and defend your choices with data.
- Proactive collaboration: you bring ideas to team calls,



ask good questions, and challenge assumptions constructively.
- High attention to detail for polished UI/UX and performance.
- Proactive, energetic, and collaborative approach to problem-solving.
- Strong communication skills and comfort working directly with leadership.

Required

- Strong experience with React.js and Next.js, including SSR, SSG, routing, and high-performance patterns.
- Solid experience developing mobile apps with React Native, including navigation, performance tuning, and familiarity with native modules.
- Strong command of JavaScript (ES6+) and asynchronous programming.
- Expertise in HTML5 and CSS3. Experience with utility or component-based systems like Tailwind or Styled Components.
- Experience integrating REST and GraphQL APIs with solid error handling, caching, and state management.
- Familiarity with modern testing frameworks such as Jest, React Testing Library, or Cypress.
- Experience working with product analytics tools (PostHog, Mixpanel, Amplitude, or similar); comfort analyzing funnels, events, retention, and session recordings.
- Ability to work effectively in fast-paced, iterative environments and thrive on shipping frequently.

Nice to Have

- Experience with TypeScript (interfaces, generics, type inference).
- Experience with Node.js (Express, NestJS) for backend collaboration.
- Experience in real estate, analytics, or data-driven consumer platforms.
- Experience taking a product feature from concept → release → production validation using analytics.
- Familiarity with mobile debugging tools and profiling performance across iOS and Android.

📌 Mobile Development Opportunity (México)
🏢 onephase
📍 México