Backend Engineer, X Chat

xAI’s mission is to create AI systems that can accurately understand the universe and aid humanity in its pursuit of knowledge. Our team is small, highly motivated, and focused on engineering excellence. This organization is for individuals who appreciate challenging themselves and thrive on curiosity. We operate with a flat organizational structure. All employees are expected to be hands-on and to contribute directly to the company’s mission. Leadership is given to those who show initiative and consistently deliver excellence. Work ethic and strong prioritization skills are important. All engineers are expected to have strong communication skills. They should be able to concisely and accurately share knowledge with their teammates.Who We AreWe're building X Chat, a groundbreaking end-to-end encrypted chat platform to revolutionize secure communication. Our mission is to empower users with privacy and freedom of speech, fostering open, diverse conversations within the X ecosystem.We ValueShipping impactful features over endless planningBuilding transformative products over minor tweaksWho You AreWe're seeking passionate backend engineers with:3+ years of experience in large-scale, high-throughput distributed systemsExpertise in Go, Python, or Java, with strong problem-solving skillsProven track record of delivering secure, user-facing featuresExperience with encryption protocols (e.g., Signal Protocol) and secure messaging systemsProficiency in designing scalable backend architectures (storage, caching, APIs)Knowledge of performance optimization, fault tolerance, and low-latency systemsFamiliarity with cloud platforms (AWS, GCP, or Azure) and containerization (Docker, Kubernetes)What You’ll DoBuild and scale X Chat’s secure, encrypted backend infrastructureCollaborate in a fast-paced, open environment to design and ship featuresIdentify and resolve system bottlenecks and security vulnerabilitiesOwn end-to-end solutions, from architecture to deploymentOptimize performance for real-time, low-latency messagingWork across the stack to deliver a seamless, secure user experienceWhy Join UsBe part of a team shaping the future of private communication. Your work will impact millions, ensuring their conversations remain secure and free. If you’re driven by impact and innovation, we want to hear from you.About the roleAn ideal candidate meets at least the following requirements:Expert knowledge of either Rust or C++,Experience in designing, implementing, and maintaining reliable and horizontally scalable distributed systems,Knowledge of service observability and reliability best practices,Experience in operating commonly used databases such as PostgreSQL, Clickhouse, and CockroachDB.Additionally, any of the below points will help a candidate stand out:Expert knowledge of Python,Experience with Docker, Kubernetes, and containerised applications,Expert knowledge of TypeScript,Expert knowledge of gRPC (unary, response streaming, bi-directional streaming, REST mapping).LocationsWe hire engineers in Palo Alto. We usually work from the office 5 days a terested in building your career at xAI? 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Created: 2025-09-21