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Collaborate closely with customers to understand their business and translate requirements into high quality software. Expect to visit our customers around 2-3 times per week....

• Design and build backend services in 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

• 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 and review implementations across our Android, iOS, desktop and web clients.

• Support and implement short-, medium- and long-term revenue strategies across the assigned hotels.
• Analyse demand, booking pace, pick-up, occupancy, ADR, RevPAR, revenue and market share performance.
• Monitor competitor pricing, market trends and changing demand patterns.

• Develop and specify cryptographic communication protocols
• Design cryptographic systems, such as key management and multi-device synchronization
• Lead Threema's migration to quantum-safe cryptography, together with the cryptography researchers at IBM Research