Join #Ensiteam! 🚀

At Ensitech, we are a custom software development company with more than 19 years of experience delivering high-quality technology solutions.

Our client is a fast-growing real estate data startup serving more than one million users. They operate in a fast-paced, highly iterative environment with two-week sprints averaging 15 to 20 tickets per cycle. The culture focuses on shipping quickly, testing real user behavior, and iterating based on data. If you like rapid development cycles, seeing your work reach production often, and contributing strategic ideas that shape the product, this team will be a great match.

About the Role

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, SSR/SSG 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 sustainability 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 and performance.
Proactive, energetic, and collaborative approach to problem-solving.
Strong communication skills and comfort working directly with leadership.

Technical Skills

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, Hotjar)—comfort analyzing funnels, events, retention, and session recordings.
Ability to work effectively in fast-paced, iterative environments and thrive at 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.

Details

Location: LATAM, remote.
- Ideal candidates: LATAM (UTC-5/UTC-6)
Time Zone: Must be able to overlap significantly with EST working hours (9am–5pm EST).
Type: Full-time.

What We Offer

✅ 100% remote opportunity
✅ Opportunity to work on cutting-edge AI projects
✅ Collaboration with leading Frontier LLM companies
✅ International and innovation-driven environment
✅ Potential contract extension based on performance and project needs

Senior Mobile Engineer (React + React N...