Tech Stack
Job Description, Responsibilities & Requirements
About the Position
Senior React Native Engineer, Mexico City
Mexico City
Lab49 – Consulting
Full-time
Hybrid
About Lab49
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 global 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 iOS and Android from day one.
Responsibilities
Technical Ownership & Delivery
- Start a new greenfield React Native application and drive it from early foundations through production release.
- Own the design and implementation of major features and core application architecture.
- Build high-quality, scalable mobile experiences using React Native and modern JavaScript/TypeScript.
- Define and evolve patterns for navigation, state management, data access, error handling, performance, and testing.
- Integrate the mobile app into an existing platform by aligning with shared design systems, domain models, and authentication approaches.
- Consume a production GraphQL 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.
Leadership & Mentorship
- Work autonomously while guiding less-experienced engineers through mentoring, pairing, and code reviews as the team grows.
- Lead small initiatives or workstreams and help ensure timely, high-quality delivery.
- Act as a role model for strong engineering judgment, ownership, and collaboration.
Client & Stakeholder Collaboration
- Partner directly with client counterparts to understand user and business objectives.
- Collaborate closely with designers and partners on UX, wireframing, and high-quality UI implementation.
- Communicate technical ideas clearly to both technical and non-technical stakeholders.
- Contribute to building trust-based client relationships as a reliable technical partner.
Requirements
- 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 iOS and Android.
- Strong proficiency in modern JavaScript and TypeScript.
- Solid understanding of mobile application architecture, performance, and reliability.
- Experience consuming GraphQL 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).
Nice to Have
- Experience defining architecture and patterns for greenfield products.
- Backend & cloud engineering exposure (.NET & Azure) to support cross-team collaboration.
- Experience with cloud platforms and data-intensive systems.
- Background in financial services, consulting, or similarly complex domains.
We Offer
At Lab49, you'll work on complex, meaningful problems with talented engineers, designers, and consultants. You'll gain broad exposure to technologies, business domains, and client environments as you grow your career.
We value curiosity, judgment, and ownership. 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.
About the Company
Our Hybrid Work Model
This 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. We believe this balance supports both flexibility and the collaboration needed to deliver excellent outcomes.
We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.