Protocol Stack Engineer

Wer wir sind

Threema is the world’s best-selling secure messenger for both private users and businesses. Since 2012, we have been working tirelessly to ensure that our users can communicate freely without worrying about their privacy. Our growing user base includes millions of private customers and thousands of businesses and organizations from all over the world.

• A young, motivated team with straightforward communication
• Flexible working hours, option to work from home up to two days per week
• Option to work from anywhere for two weeks per year
• Option to take unpaid leave
• You can choose your own hardware (macOS or Linux)
• Public transportation discount or parking space (electric car charging available)
• Free use of fitness room, including a fitness trainer once a month
• Professional massage once a month
• Internal German or English courses
• A great coffee machine ;-)
• Regular company events and aperitifs
• The good feeling of contributing to the effective protection of the privacy of millions of people

Your Role

• Design new protocol features and extensions, such as multi-device sync, group messaging, and calls, and write the specifications for them
• Implement protocol logic in Rust and review implementations across our Android, iOS, desktop, and web clients
• Model threats and reason through edge cases like message reordering, device loss, malicious servers, and compromised keys
• Work with external security researchers and auditors, respond to findings, and ship fixes
• Keep backward compatibility for a large installed base while moving the protocol forward
• Mentor other engineers and help set standards for how we write and review security-critical code

What you bring

• At least six years of software engineering, with several years working on network or cryptographic protocols
• A solid grasp of applied cryptography: you know how authenticated encryption, key exchange, forward secrecy, and post-compromise security work, and where implementations usually go wrong
• Experience in reading and writing protocol specifications precise enough for someone else to implement from
• Strong skills in at least one systems language; Rust is a plus
• Care about the details: in this job, a missing length check is a vulnerability

Fähigkeiten

RustSecurity

Gehaltsspanne

Auf Anfrage

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