Senior Backend Software Engineer (AI Native)

About the role

Qrypt's mission is to protect the world's data and restore privacy. Qrypt hardens cybersecurity and future-proofs encryption against quantum attacks by eliminating key transmission. Qrypt's unique technology independently generates symmetric keys at multiple endpoints for critical workflows today. We are a passionate team of engineers, physicists, and cryptographers committed to transforming the way the world safeguards data and communications!

Qrypt is looking for a Senior Backend Software Engineer to own the services behind our quantum security products. You will lead the design and development of backend software — primarily in Rust — that moves quantum entropy and keys, powers our entropy-as-a-service platform, and makes our appliances work reliably and securely at scale. You will use AI-assisted development tooling as a core part of how you work, own the correctness and quality of what ships, and help set how the team engineers in an AI-native way.

What you'll do -

Lead the design, development, and testing of backend services and APIs, primarily in Rust, with some C++ and Python.

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Own significant parts of the backend end to end: architecture, implementation, reliability, and performance.

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Make and document design tradeoffs; raise the bar on code quality, testing, and review across the team.

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Work close to the metal on the software that delivers quantum entropy and keys reliably and securely.

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Use AI-assisted and agentic development tooling to accelerate your work while owning the correctness and quality of everything you ship.

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Help shape how the team adopts AI-assisted development (instruction conventions, review standards) as the tooling matures.

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Develop deep domain understanding (quantum random number generation, cryptography, network security) to architect and validate our products.

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Mentor other engineers and collaborate across hardware, product, and engineering to ship end-to-end.

What you'll need -

Bachelor's degree in Computer Science or a related technical field, and/or relevant work experience.

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6+ years building and shipping backend software, including ownership of services end to end.

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Expertise in Rust, or deep systems-programming experience (C, C++, Go) with a demonstrated ability to work primarily in Rust at a senior level.

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Working proficiency with C++ and Python.

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Strong command of backend architecture: APIs, services, concurrency, reliability, performance, and Linux.

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Fluency with AI and agent-assisted development, and the judgment to apply it where it adds real leverage — reviewing, correcting, and taking full ownership of AI-generated work. This is core to how we operate at Qrypt and is expected of everyone here.