Senior Fullstack Software Engineer (Go / React)

Unavailable; Ciudad de Mendoza; On-site; ARS 1,200,000 - 2,400,000; Full time

Job summary

Unknown is seeking a Full Stack Engineer to join our Cloud Platform Engineering Team. You will build and scale end-to-end web applications, linking responsive UIs with robust backend services and secure authentication workflows.

You will design PostgreSQL schemas, build and consume REST APIs, and package logic as OCI containers. You will integrate Keycloak for OIDC/OAuth 2.0 flows, secure endpoints with JWT, and implement modern security practices.

Qualifications

• 3+ years of professional software development experience with hands-on work in React and backend services.
• Experience designing and querying PostgreSQL databases for performance and scalability.
• Experience designing and consuming REST APIs.

Responsibilities

• Build and scale end-to-end web applications connecting modern UIs with robust backend services, databases, and secure authentication workflows.
• Design, optimize, and query PostgreSQL database schemas for performance and scalability.
• Build and consume RESTful APIs and package application logic as stateless OCI container images.
• Integrate OIDC/OAuth 2.0 authorization flows into React frontends and backend services using Keycloak.
• Secure API endpoints through JWT verification, token exchange policies, and scope validation.
• Implement modern web security practices including token storage, CORS, and stateless session management.
• Write and maintain unit, integration, and contract tests.
• Integrate automated testing into GitHub Actions, ensuring tests run on every PR.
• Collaborate with the engineering team to build reliable, maintainable, and scalable cloud-based applications.

Skills

React

PostgreSQL

REST APIs

OIDC/OAuth 2.0/JWT

Token storage

CORS

Containerized apps

CI/CD (GitHub Actions)

Testing (unit/integration/contract)

Tools

Keycloak

Job description

The Role:

We are looking for a Full Stack Engineer to join our Cloud Platform Engineering Team.

In this role, you will be responsible for building and scaling end-to-end web applications, connecting modern and responsive user interfaces with robust backend services, database architecture, and secure authentication workflows.

Design, optimize, and query PostgreSQL database schemas with a strong focus on performance and scalability.

Build and consume RESTful APIs, packaging application logic as stateless OCI container images.

Integrate OIDC/OAuth 2.0 authorization code flows into React frontends and backend services using Keycloak.

Secure API endpoints through JWT verification, token exchange policies, and scope validation.

Implement modern web security practices, including appropriate token storage, CORS, and stateless session management.

Write and maintain unit, integration, and contract tests.

Integrate automated testing into GitHub Actions, ensuring tests are executed on every pull request.

Collaborate with the engineering team to build reliable, maintainable, and scalable cloud-based applications.

Requirements:

• 3+ years of professional software development experience, with strong hands-on experience in:


• React


• Relational databases, particularly PostgreSQL


• Experience designing and consuming REST APIs.


• Direct experience with Keycloak, including client libraries such as keycloak-js.


• Solid understanding of OIDC, OAuth 2.0, JWT, and modern web authentication and authorization practices.


• Understanding of token storage best practices, CORS, and stateless session management.


• Experience working with containerized applications and workflows.


• Experience with automated CI/CD environments, preferably GitHub Actions.


• Strong understanding of software engineering best practices and the ability to build secure, scalable, and maintainable applications.

Core Tech Stack