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Hi, I’m Jean Piere Sullón, a mobile and full-stack engineer focused on delivering production-grade React Native apps with TypeScript. I’ve built payment features (P2P transfers, bill payments, QR payments) and integrated secure authentication (OAuth2/OpenID Connect, biometrics) to create smooth, secure experiences. On the backend, I’ve worked with Node.js, NestJS, GraphQL (Apollo), and AWS serverless services (Lambda, DynamoDB, Cognito). I enjoy designing scalable APIs and collaborating with teams to ship reliable software.…Hi, I’m Jean Piere Sullón, a mobile and full-stack engineer focused on delivering production-grade React Native apps with TypeScript. I’ve built payment features (P2P transfers, bill payments, QR payments) and integrated secure authentication (OAuth2/OpenID Connect, biometrics) to create smooth, secure experiences. On the backend, I’ve worked with Node.js, NestJS, GraphQL (Apollo), and AWS serverless services (Lambda, DynamoDB, Cognito). I enjoy designing scalable APIs and collaborating with teams to ship reliable software.

Jean Piere Sullón

Full Stack Developer, Web Developer, Back-End Developer, +2

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Hi, I’m Jean Piere Sullón, a mobile and full-stack engineer focused on delivering production-grade React Native apps with TypeScript. I’ve built payment features (P2P transfers, bill payments, QR payments) and integrated secure authentication (OAuth2/OpenID Connect, biometrics) to create smooth, secure experiences. On the backend, I’ve worked with Node.js, NestJS, GraphQL (Apollo), and AWS serverless services (Lambda, DynamoDB, Cognito). I enjoy designing scalable APIs and collaborating with teams to ship reliable software.…Hi, I’m Jean Piere Sullón, a mobile and full-stack engineer focused on delivering production-grade React Native apps with TypeScript. I’ve built payment features (P2P transfers, bill payments, QR payments) and integrated secure authentication (OAuth2/OpenID Connect, biometrics) to create smooth, secure experiences. On the backend, I’ve worked with Node.js, NestJS, GraphQL (Apollo), and AWS serverless services (Lambda, DynamoDB, Cognito). I enjoy designing scalable APIs and collaborating with teams to ship reliable software.

Available to hire

Hi, I’m Jean Piere Sullón, a mobile and full-stack engineer focused on delivering production-grade React Native apps with TypeScript. I’ve built payment features (P2P transfers, bill payments, QR payments) and integrated secure authentication (OAuth2/OpenID Connect, biometrics) to create smooth, secure experiences.

On the backend, I’ve worked with Node.js, NestJS, GraphQL (Apollo), and AWS serverless services (Lambda, DynamoDB, Cognito). I enjoy designing scalable APIs and collaborating with teams to ship reliable software.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Language

English

Fluent

Work Experience

Mobile / Full-Stack Developer at Interfell (Client: Kash App / Valora)

March 1, 2024 - Present

Developed new mobile features for transactions, bill payments, and peer-to-peer transfers using React Native. Built and enhanced the Payments module, including integrations with local utility/service providers and SINPE payments. Implemented global state management and GraphQL queries/mutations with Apollo Client. Delivered QR code payments for merchants and contributed native libraries to support payment flows. Improved app performance using code splitting, lazy loading, and image optimization strategies. Integrated Face ID / Touch ID authentication and implemented OAuth 2.0 / OpenID Connect with native Android libraries. Designed and implemented secure REST and GraphQL APIs with NestJS following OWASP API Security guidance.

Full-Stack Freelance at Option SA (Sky Airlines)

February 1, 2022 - February 28, 2023

Integrated APIs into Vue web apps to manage customer bookings and deliver real-time flight availability updates; led migration from Vue 2 to Vue 3 using the Composition API. Built and maintained FastAPI endpoints consumed by Nuxt for flight search and booking flows, baggage separation, and onboarding of new flight routes. Delivered a refreshed look & feel across web and mobile experiences, integrating REST APIs with NestJS and TypeScript while ensuring strong type safety and maintainable architecture.

Full-Stack Developer at Capicua (KnockApp/ MK/ Hello fund)

July 1, 2020 - February 28, 2024

Integrated APIs into React SPAs to handle customer orders and real-time product availability updates. Implemented API routes in Next.js for authentication, form submissions, and third-party integrations. Developed REST and GraphQL APIs using Node.js and TypeScript, ensuring type safety and scalable backend services. Enabled offline-first usage by implementing data synchronization with Apollo Client and GraphQL. Automated TypeScript types using GraphQL schema generation. Improved QR code scanning to reliably scan large payloads. Deployed applications to app stores; improved security posture via code reviews and static analysis.

Mobile Developer at Baufest SA

November 1, 2019 - July 31, 2020

Developed Android and iOS applications with Xamarin; supported logistics workflows for container positioning and transport. Built microservices using .NET and managed relational databases. Supported a Progressive Web App (Angular) and implemented server-side validation with JWT.