I will build secure full stack apps with go, java, kotlin and react

J
joaquinpereyrar
J
joaquinpereyrar
Joaquin Pereyra
build secure full stack apps with go, java, kotlin and react
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build secure full stack apps with go, java, kotlin and react

About this gig

Are you looking for a scalable and production-ready application? You are in the right place.


I am a Senior Software Engineer with 3+ years of experience designing and maintaining backend APIs, including security-sensitive systems at scale.


What I offer:

- REST API development in Go or Java with Spring Boot

- Full stack applications with React frontend

- Secure authentication and registration flows

- AWS deployment and cloud-ready architecture

- Clean, well-documented and maintainable code


Why work with me:

- Senior-level engineer with real production experience

- Used to working in cross-functional teams under high-demand environments

- Fast communication and transparent delivery


Whether you need a simple API, a full stack MVP, or a robust production system, I have the right package for you.


Feel free to message me before placing an order so we can discuss your project in detail.


  • Programming language

    • Kotlin

  • Expertise

    • Algorithms & Data structures
    • Debugging
    • Performance
    • Security
    • Databases

  • Frontend framework

    • Next.js
    • React.js

  • Backend framework

    • Next.js
    • Node.js
    • Spring

  • AI & low/no code builders

    • Cursor
    • Other

Get to know Joaquin Pereyra

Joaquin Pereyra

Sr Software Engineer

  • FromUruguay
  • Member sinceJun 2026
  • Avg. response time3 hours
  • Last delivery1 week

  • Languages

    Spanish, English
I am a Senior Software Engineer at Mercado Libre dedicated to designing and maintaining internal APIs to detect and prevent malicious behavior. I focus on implementing policies and evaluators that strengthen security during registration and authentication processes. I collaborate with cross-functional teams to develop scalable and efficient software solutions that protect user integrity.

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