Lab49 is an NYC-based award‐winning specialist consultancy that creates bespoke technology in partnership with the world's leading financial institutions. Founded in 2002 to bring Silicon Valley engineering practices to Wall Street, we've delivered hundreds of high‐impact projects across integral investment banks and buy‐side firms, spanning distributed systems, high‐performance automation, enterprise UX, cloud, and data‐driven platforms.At Lab49, engineers work directly with clients to design and deliver production systems. We combine technology, design, and business to solve real problems where quality, performance, and clarity matter.We are currently seeking a Senior React Native Engineer to design and build a new, greenfield mobile application for buy‐side investment management research workflows. The mobile app will integrate into an existing web‐based platform and will be built for i OS and Android from day one.As a Senior React Native Engineer , you are an experienced, autonomous contributor who takes ownership of significant parts of a system and helps elevate the engineers around you.You will work directly with clients and collaborate closely with designers and backend engineers to ensure the mobile experience aligns cleanly with an existing platform, including shared design systems, domain models, and authentication.This is a hybrid role, requiring 1 day per week at the office in central CDMX (Insurgentes Sur).Start a new greenfield React Native application and drive it from early foundations through production release.Build high‐quality, scalable mobile experiences using React Native and modern Java Script/Type Script.Define and evolve patterns for navigation, state management, data access, error handling, performance,



and nsume a production Graph QL API implemented in. NET, collaborating with backend partners to evolve the schema as mobile requirements become clearer.Build data‐intensive views backed by paginated APIs, ensuring strong perceived performance and usability.Ensure testing, quality, and maintainability are built into the system from the start.Lead small initiatives or workstreams and help ensure timely, high‐quality llaborate closely with designers and partners on UX, wireframing, and high‐quality UI implementation.You establish a strong mobile foundation and ship a production‐quality i OS and Android application.6–8+ years of experience designing and building production software.~ Strong commercial experience building production mobile applications with React Native.~ Experience shipping and operating apps on both i OS and Android.~ Strong proficiency in modern Java Script and Type Script.~ Solid understanding of mobile application architecture, performance, and reliability.~ Experience consuming Graph QL APIs in production and collaborating on schema evolution.~ Solid understanding of SDLC practices, CI/CD, automated testing with tools such as Detox or Maestro, and code quality.~ Excellent written and spoken English communication skills (C1+ is highly preferred) Backend & cloud engineering exposure (. NET & Azure) to support cross‐team collaboration.Experience with cloud platforms and data‐intensive systems.If you care about quality, enjoy helping others succeed, and want your work to have real impact, Lab49 is a place where you can thrive.Our Hybrid Work ModelThis role is based in Mexico City with a hybrid work model. Team members typically work in person one day per week, and more when needed, collaborating closely with teammates in Mexico and the US.

📌 Senior react.js engineer (Ciudad de México)
🏢 Ion Group
📍 Ciudad de México