Senior iOS Software Engineer - Geneva

Proton, a privacy-focused company based in Geneva, is hiring a Senior iOS Software Engineer to build high-quality applications for products like Proton Mail, Proton Drive, and Proton VPN. The role involves designing scalable mobile architectures, mentoring engineers, and contributing to privacy-first consumer products used by millions.

Based in Geneva, this role places you within one of Proton’s high-impact product teams, working on privacy-first applications including Proton Mail, Proton Drive, Proton VPN, Lumo, and Meet. You’ll contribute to technically ambitious projects with real-world impact, collaborating across product, design, and engineering to define excellence in privacy-focused consumer software for Apple platforms.

Responsibilities

• Develop and release high-quality iOS applications with a focus on user experience and product excellence
• Design and implement mobile architectures that are maintainable, scalable, and thoroughly testable
• Work across large, complex codebases and coordinate with multiple engineering and product teams
• Guide junior engineers and elevate the team’s technical standards
• Optimize application performance, concurrency, and memory usage on mobile devices
• Engage in product and technical discussions, especially in ambiguous or evolving contexts

Requirements

• Proven track record of building and shipping high-quality iOS applications
• Strong commitment to product quality, usability, and exceptional user experiences
• Deep experience in creating maintainable, scalable, and testable mobile architectures
• Ability to navigate large codebases and collaborate effectively across multiple teams
• Experience mentoring engineers and improving team technical standards
• Solid grasp of performance optimization, concurrency, and mobile memory management

Nice to have

• Background in privacy, security, encryption, sync systems, or offline-first application design
• Experience with Rust programming language

What the company offers

• Meaningful work: your contributions directly support millions of users who trust Proton for their privacy, with no external pressures from advertisers or investors
• Stock options: from day one, you become a shareholder in Proton, aligning your success with the company’s growth
• Technology: access to the right hardware and software tools to perform at your best
• Learning and development: opportunities for career growth through real ownership and challenging projects
• Employee benefits: comprehensive health coverage, retirement options, generous leave, and wellness support
• In-person collaboration: frequent face-to-face interaction with passionate, skilled colleagues across offices in Geneva, Zürich, Barcelona, and London
• Daily meals: lunch and snacks provided at the office to help you focus on your work
• Transport support: coverage of public transport, bike allowances, or parking costs
• Flexible work schedule: set your own hours based on team needs and outcomes, not clock-in times

About the company

Proton was founded in 2014 by CERN scientists on the principle that privacy is a fundamental human right. The company is profitable, independent, and hires selectively from the top tier of applicants. With over 500 team members across more than 50 countries, Proton emphasizes fast execution, low hierarchy, and real impact over appearances.

• Founded on the belief that privacy is a human right
• Profitable and independent, without venture capital control
• Hires from the top 1% of applicants globally
• Team members come from elite academic and industry backgrounds
• Fast-paced environment with low hierarchy and high impact
• Focus on meaningful work with exceptional colleagues