Senior Rust Engineer (80-100%)

The Role

We're looking for a senior engineer to help design and build the core services behind our messaging backend. You'll work on the systems that handle message delivery, real-time presence, and end-to-end encryption at scale. Most of our backend is written in Rust, and we're expanding it further.

You'll join a small team of engineers who care about correctness, performance, and keeping things simple. Expect to write production code, review other people's code, and have a say in architecture decisions from day one.

What You'll Do

• Design and build backend services in Rust that handle high-throughput, low-latency messaging traffic
• Work on core infrastructure: message queues, delivery guarantees, connection handling, and storage layers
• Debug and optimize systems under real production load, not just in benchmarks
• Review code and mentor other engineers on Rust patterns and systems design
• Take ownership of a service end to end, from design through deployment and maintenance

Who You Are

• 10+ years of professional software engineering experience, with at least 2 years writing Rust in production
• Solid understanding of concurrency, memory management, and systems programming
• Experience with distributed systems: what happens when a network partitions, a node dies, or a queue backs up
• Comfort working close to the metal when needed, whether that's networking, storage engines, or protocol design
• Experience in working on scalable, low-latency, high-throughput systems.
• Good communication skills. You'll need to explain trade-offs to people who don't write Rust
• A degree in computer science or equivalent experience. We care more about what you've shipped than where you studied

Nice to Have

• Experience with async Rust (Tokio or similar)
• Background in messaging protocols, telecom, or real-time systems
• Contributions to open source Rust projects
• Experience with encryption or security-critical systems

What We Offer

• 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

Place of work: Pfäffikon SZ (Greater Zurich Area)

Start date: Immediately or by agreement