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Proton Tech Stack

Privacy-first ecosystem of encrypted email, VPN, storage, and productivity tools

Technology, Information and Internet Geneva, Geneva 501–1,000 employees Founded 2014 Privately Held

Proton operates a multi-product ecosystem built on encryption and privacy: Mail, VPN, Calendar, Drive, Pass, and Lumo (a privacy-respecting AI assistant). The tech stack—Swift, Go, React, Rust, Kotlin across iOS, Android, and web—reflects a mature, multi-platform engineering organization. Active hiring across Spain, Lithuania, Taiwan, France, UK, Switzerland, Czechia, and the US signals geographic expansion, while Proton's shift toward Rust and Kubernetes adoption suggests infrastructure modernization alongside product velocity.

Tech Stack 55 technologies

Core StackSwift Go React PHP Jira Sketch Rust Kotlin Jetpack Compose GitLab Java Linux MySQL iOS macOS iPadOS Proton Mail Proton VPN Proton Calendar Proton Drive Proton Pass Symfony Android Windows Espresso UI Automator Xcode XCUITest Apple ProxySQL+24 more

AdoptingRust Kubernetes

What Proton Is Building

◆Challenges

Expanding into b2b segment
High-quality lead generation
Reducing spam misclassifications
Blocking abusive signups
Spam and abuse mitigation
Bypass network restrictions in highly censored countries
Team efficiency
Low conversion rates
Acquisition and retention of high-quality partners
Simplification and automation of hris processes

▲Active Projects

Proton drive
Lumo
Proton pass
Simplelogin
Meet
Developing innovative productivity tools
Performance framework design
Mail and calendar mobile app testing
Creating end-to-end payments experience
Growth of mail & calendar product

Hiring Activity

Steady190 roles · 65 in 30d

Department

Engineering

120

Marketing

28

Product

13

HR

6

Design

5

Security

5

Data

3

Sales

2

Seniority

Senior

83

Mid

60

Lead

24

Director

6

Manager

6

Staff

5

Junior

3

Notable leadership hires: Head of Growth, Affiliate Head, Engineering Director

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About Proton

Proton is a Switzerland-based privacy company serving over 100 million users worldwide with a suite of encrypted, ad-free tools. Founded in 2014 by scientists from CERN and MIT, the company operates as a community-funded, subscription-based business governed by the Proton Foundation, a Swiss non-profit. The organization spans 501–1,000 employees across eight countries and maintains an engineering-heavy structure focused on expanding beyond consumer adoption into B2B segments, while addressing operational challenges in spam mitigation, lead quality, and platform abuse prevention.

HeadquartersGeneva, Geneva

Company Size501–1,000 employees

Founded2014

Hiring MarketsSpain, Lithuania, Taiwan, France, United Kingdom, Switzerland, Czechia, United States

Frequently Asked Questions

What tech stack does Proton use?

Swift, Go, Rust, React, and Kotlin. iOS/macOS/iPadOS use Swift and XCUITest; Android uses Kotlin with Jetpack Compose. Web is built on React and PHP/Symfony. Proton is adopting Kubernetes and Rust for infrastructure modernization.

What products is Proton working on?

Active projects include Proton Drive, Lumo (privacy-respecting AI assistant), Proton Pass (password manager), SimpleLogin (email alias service), and Proton Meet (video conferencing). Mobile app testing and end-to-end payment experiences are also in active development.