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# Backend Engineer (Vpn) - Build Scalable Privacy Systems

- **Company:** Proton
- **Location:** Madrid, Spain
- **Contract:** Permanent contract
- **Skills:** PHP (Programming Language), Virtual Private Networks (VPN), MySQL, Redis, Site Reliability Engineering Practices, SQL Databases, Openapi, Grafana, Backend, Restful APIs, Docker
- **Published:** September 29, 2026
- **Apply:** https://www.buscojobs.com.es/backend-engineer-vpn-build-scalable-privacy-systems-en-madrid-ID-373209913

## About the Role

Proton in Barcelona is seeking a skilled Backend Engineer to help build the VPN backend that scales for millions of users while upholding privacy by default.
You will collaborate with engineers, architects and product managers to deliver reliable services and robust APIs.
Bring hands-on PHP backend experience, SQL/MySQL, Redis, Docker and security focus.
Familiarity with OpenAPI, observability tools like Grafana/OpenTelemetry, and on-call/SRE practices is a plus.
#J-*****-Ljbffr

## Description

Proton in Barcelona is seeking a skilled Backend Engineer to help build the VPN backend that scales for millions of users while upholding privacy by default.You will collaborate with engineers, architects and product managers to deliver reliable services and robust APIs.Bring hands-on PHP backend experience, SQL/MySQL, Redis, Docker and security focus.Familiarity with OpenAPI, observability tools like Grafana/OpenTelemetry, and on-call/SRE practices is a plus.#J-*****-Ljbffr