Join Proton and build a better internet where privacy is the default

At Proton, we believe that privacy is a fundamental human right and the cornerstone of democracy. Since our inception in 2014,

founded by a team of scientists from CERN, we have dedicated ourselves to providing free and open-source technology to millions

worldwide, ensuring access to privacy, security, and freedom online.

Our journey began with Proton Mail, the largest secure email service globally, and has since expanded to include Proton VPN,

Proton Calendar, Proton Drive, and Proton Pass. These tools empower individuals and organizations to take control of their

personal data, break away from Big Tech’s invasive practices, and defeat censorship. Our work impacts hundreds of millions of

lives, from activists on the front lines defending freedom to leaders in governments protecting sensitive information. In some

cases, Proton’s services have even been instrumental in saving lives by enabling secure and private communications in high-risk

situations.

Proton is a profitable company that does not rely upon VC funding, supporting over 100 million user accounts with a growing team

of over 500 people from over 50 different countries, from the world's top companies and universities. We value intelligence,

learning potential, and ambition in our hiring process. Adaptability is key as we navigate uncharted territories and redefine how

business is conducted online.

Hiring at Proton is highly selective, with less than 1% of candidates hired. We believe smaller teams of exceptional talent will

always prevail over larger teams with lower talent density. You will have the opportunity to work with many of the world's top

minds in their fields, ranging from former international math and science olympiad winners to chess champions.

We have a global mindset and big ambitions but remain a start-up at heart. We value empowerment and flexibility and keep our

structure flat to keep moving fast and avoid unnecessary politics. Tired of blending into the crowd? Join us and do work you can

truly be proud of. Check our open-source projects here!

Purpose of the role

MSA is a highly multi-disciplinary group started in 2019 to tackle difficult mail delivery, spam, abuse, and account security

problems that impact the Proton ecosystem. We built sophisticated systems from scratch that combine human intelligence and machine

learning to make tens of millions of realtime or asynchronous decisions each day. Our custom systems have reduced spam filter

misclassifications by over 60%, blocked millions of abusive bulk signups, protected hundreds of thousands of users from account

compromise by attackers, and mitigated hundreds of DDoS attacks. In the last few years, we have also been building complicated new

products, including launching Wallet, Lumo AI, and Meet. We are the main group at Proton working on AI. In order to move fast with

limited resources, we are organized into autonomous teams responsible for the whole system, with expertise across infrastructure,

data storage, backend, web and mobile apps, machine learning, security and operational excellence. We are looking for humble,

mission-driven, systems-thinking people who want to make a big impact in a startup environment.

What you will do

MSA builds and operates many services responsible for different domains. You will:

work with other engineers and analysts to design, build, and operate these systems
work on special user-facing features involving frontend and backend software development
You will have the opportunity to play Product or Project Managers roles and lead the whole planning and development process
be responsible for the operational excellence of the systems/features and their interaction with other systems
You may work on MSA's custom systems written in Python or on the main Proton API written in PHP or on Proton Web apps written

in React or even on native iOS and Android mobile apps

Job requirements

Deep experience with backend development (Python, PHP, or Go)
Experience with frontend design and development (JavaScript, React, Typescript, or jQuery)
Experience building complex production systems
Experience with data processing and storage (MySQL, MongoDB, Redis, Kafka, Elastic, Ceph, ClickHouse)
Able to work autonomously and lead the whole development process, from design to QA
Experience with AI tools and AI agents
Excellent English communications, both written and spoken

Bonus points for:

experience with machine learning and real-time prediction systems
experience with iOS or Android app development
experience with managing Linux servers, including infrastructure as code (Puppet, Ansible) and containerization

What We Offer

Office First: Collaboration is easier and more effective in person, which is why we have offices in Geneva, Zurich, Prague,

Barcelona, Paris, London, Vilnius, Skopje, and Taipei. You can also enjoy working from home up to 30% of the time, while

enjoying great company during our three core days in the office.

Technology: We provide all the devices and software you need to excel in your role, ensuring you have the best tools at your

disposal to achieve your goals.

Food: Lunch and snacks are provided by Proton every day at our offices.
Transport: We will always support our employees with transport costs through subsidizing public transport, bike allowances, or

parking spaces based on your office location.

Stock Options: At Proton, we are all owners of the company and you get stock options when you join us.
Flexible Working: You can define your own working hours as long as it works with team meetings.
Learning and Development: We are committed to your professional growth. Proton offers various learning opportunities, including

training programs, conferences and events, and continual learning.

Employee Benefits: Comprehensive health insurance plans, competitive retirement savings options, generous vacation and leave

policies, and wellness programs.

Work that Matters: Proton is a community-first organization, started with the support of a crowdfunding campaign and built with

community input. To this day, Proton’s only source of revenue is user subscriptions. Over 100 million people trust and support

Proton, and we put our users and community first in everything we do. Read more about our impact here.

Our Commitment to Diversity and Inclusion

At Proton, we believe diversity drives innovation and strengthens our mission to provide privacy as a default for all. We are

committed to fostering an inclusive environment where all individuals, regardless of race, ethnicity, gender, age, sexual

orientation, physical ability, or socio-economic background, feel valued and empowered. We strive to create equal opportunities,

promote open dialogue, and support continuous learning to ensure every voice is heard and respected.

If you need any extra support or reasonable adjustments during the hiring process, please let your talent partner know.

Candidate Privacy Notice

When you apply for a position, refer a candidate, or are considered for a role at Proton Technologies AG (Proton, we, us, or our),

your information is stored in Greenhouse, in accordance with their Service Privacy Policy. This information is used to evaluate

your suitability for the posted position. We also retain this information for consideration for future roles that you may apply

for or that we believe may align with your background and skills.

If we no longer have a legitimate business need to process your information, we will either delete or anonymize it. Should you

have any inquiries about how we use or manage your information, or if you wish to access, correct, or delete your data, please

contact our privacy team at careers@proton.ch.

Proton does not accept unsolicited resumes from any sources other than directly from candidates. We will not pay a fee for any

placement resulting from an unsolicited offer, even if the candidate is subsequently hired by Proton.

To learn more about our privacy policy, please visit our privacy policy page.

#LI-ONSITE

Roll

Fullstack Software Engineer (Email Security & Anti-Abuse)

Kategori

CC - Anti-Abuse

Plats

Geneva; Taipei; Skopje

Publicerad

8 juni

Sista ansökningsdag

16 augusti

Taggar för det här jobbet

CC - Anti-Abuse

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Fullstack software engineer

TheFork

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PythonReactAWS

Senior Frontend Software Engineer

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Spend on technology is one of the biggest items in an enterprise CFO’s budget, second only to headcount. Traditional procurement is one of the most frustrating, friction-filled bottlenecks in modern businesses. A single purchase routinely stalls for months, drowning in endless email threads and dragging in teams from Finance, Legal, Security, and IT. Vertice is the world’s first Intelligent Procurement Platform aiming to eliminate this chaos. By combining automated agentic workflows, deep AI insights, and a global network of expert negotiators, we empower enterprises to buy smarter and scale at pace. The market response has been unprecedented: * $75bn+ in spend processed across our platform. * 20% savings consistently delivered to our customers. * 70% reduction in standard enterprise procurement cycles. * 13X revenue growth achieved over the last two years alone. 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PythonReactAWS