Senior Rust Systems Engineer

Job Description

Job Description

Who Are We?

At Parry Labs we believe the modern combat advantage relies on the speed and scale of open systems. We’re redefining the edge of the ever-changing and increasingly ever-changing battlespace by delivering game changing capabilities to our warfighters through digital engineering, software, and hardware solutions that are essential to our core of being a Digital Systems Integrator.

Born digital and agile, Parry Labs is building a winning team to be the premier provider for Next Generation Mission Systems Integration across air, land, sea, space and cyber.

Are you ready to be an instrumental part of experts in the industry? Join us in the innovation of integration at Parry and apply to help develop the technologies of tomorrow while reaching new heights in your career today.

About the Job

The Platform is a ~140,000-line Rust workspace spanning 24 crates: no_std embedded primitives, an async Tokio daemon, a 30,000-line distributed consensus engine, post-quantum cryptographic infrastructure, and a real-time WebSocket dashboard. It targets defense and critical infrastructure deployments where deterministic execution and zero-panic guarantees are non-negotiable. We need a Rust engineer who can own the full workspace from hardware abstraction layers to API servers, hold the architecture sound as the system scales to full multi-site production, and treat the no-panic policy as an inviolable contract. 

Duties & Responsibilities

• Own and extend the multi-crate Rust workspace: consensus engine, coordination engine, transport layer, daemon orchestration, data ingestion, hardware abstraction layer, and 18+ supporting crates
• Maintain no_std compatibility across core crates for constrained embedded deployment targets
• Implement and harden production readiness gates: structured logging, rate limiting, replay protection, metrics collection, and durable state persistence
• Design and optimize the async runtime architecture (Tokio): task orchestration, graceful shutdown, backpressure handling, and cancellation safety
• Enforce the no-panic runtime policy across the entire workspace; systematically eliminate unwrap and expect from all production code paths
• Build and maintain CI pipelines, fuzz harnesses (cargo-fuzz), and property-based tests (proptest)
• Manage feature-flag complexity and compilation performance across the workspace
• Support multi-site deployments: cross-compilation, air-gapped packaging, and site-specific configuration
• Maintain safe API boundaries between cryptographic crates and the rest of the workspace
• Own the mesh member lifecycle state machine and guard all transitions against invalid progressions
• Other duties as assigned

Required Qualifications

• 5+ years of professional Rust development in production systems
• Deep no_std and embedded Rust experience: heapless, fixed-capacity collections, custom allocators
• Strong async/Tokio expertise: task orchestration, graceful shutdown, backpressure, and cancellation safety
• Track record building multi-crate workspaces with clean dependency management and feature gating
• Experience with network protocol implementation: TCP/UDP framing, wire formats, gossip protocols
• Proficiency with the Rust testing ecosystem: cargo-fuzz, proptest, criterion, integration test harnesses
• Comfort with CI/CD for Rust projects: cross-compilation, clippy enforcement, MIRI for unsafe validation

Preferred Qualifications

• Experience with distributed systems, fault-tolerant consensus, or distributed fault tolerance research
• Prior work in defense, aerospace, or environments requiring deterministic execution guarantees
• Experience building hardware abstraction layers for embedded sensors or constrained receivers
• Contributions to the Rust ecosystem: open-source crates, RFCs, or conference talks
• Familiarity with structured binary cryptographic envelope formats
• Understanding of Merkle tree construction and public key commitment schemes

Why Join Parry Labs?

At Parry Labs, we foster a culture of curiosity and collaboration. Employees are given the autonomy to leverage their skills in creating state-of-the-art tech solutions that aid in the protection of the American Warfighter. We encourage new and bold ideas that push the status quo. It is this entrepreneurial spirit that drives us.

Parry Labs will support you with workplace flexibility, a commitment to the health and well-being of you and your family and provide opportunities to work with a purpose. We are committed to supporting your success in both your professional and personal lives with benefits such as education assistance and unlimited paid time off, just to name a few.

No One Has Time for Long Job Applications!

We completely understand, that is why we have made the application process easy. We promise. This will be simple.

Accessibility/Accommodation:

If because of a medical condition or disability you need a reasonable accommodation for any part of the employment process, please send an e-mail to View email address on us.fitly.work or call View phone number on us.fitly.work to let us know the nature of your request and contact information.