Senior Rust Developer — Qt Bridge for Rust @ Spyrosoft

About the role

Qt Bridge for Rust lets developers build Qt Quick / QML user interfaces with a pure-Rust backend — no C++ required. Rust types are exposed to the QML engine through attribute macros that generate the QMetaObject-level plumbing at compile time. The library is built on CXX and CXX-Qt for the C++/Qt interop layer.

You'll join the in-house Qt Bridge for Rust team to help design, implement and harden this library. The team already owns deep Qt platform expertise — the meta-object system, C++/QML engine internals, code generation. What we need from you is Rust expertise: idiomatic API design, the crate ecosystem, procedural macros, and cross-platform build engineering. You don't need to be a Qt expert — being able to read and reason about the C++ layer is enough.

The backlog is public, so you can see exactly what you'd be working on before you apply. Early priorities are object-model / memory-safety work and type-system / macro work.

What's NOT part of this role

• Changes to Qt itself (qtbase, qtdeclarative) — that's owned by Qt's module teams
• Product management, roadmap or release ownership
• End-user support or community management

Logistics

• B2B project-based cooperation
• Duration: at least 6 months, option to extend by next 6 months
• Start: as soon as possible
• Location: fully remote
• Process: technical interview (~90 min) covering Rust knowledge and, optionally, QtBridge-specific topics

What we're looking for

• Senior-level Rust experience in production: ownership/borrowing, Rc/RefCell/Weak, unsafe and the aliasing rules, Pin, lifetime-parameterised APIs
• Rust ↔ C++ FFI experience, ideally with cxx — designing safe Rust wrappers over C++ object lifetimes
• Procedural macro development (syn, quote, proc-macro2), with attention to good compile-error diagnostics
• Experience designing and stabilizing a public library API — idiomatic Rust, semver, deprecation practices
• Cross-platform Rust build engineering (build.rs, linking native libraries on Linux, MSVC, macOS)
• Strong testing and quality habits: tests with every change, clean cargo fmt / clippy, documented safety arguments for any unsafe, rustdoc on public API
• Comfort with threat modelling / security review for systems-level, memory-unsafe-adjacent code
• Working knowledge of Qt 6 (QObject, properties, signals/slots, QVariant/QMetaType, QML object ownership) and enough C++17 to read/modify the bridge's C++ layer
• Comfortable with Gerrit-style, small-commit, review-heavy workflows
• Professional written and spoken English

Nice to have

• Prior contributions to Qt, CXX-Qt, qmetaobject-rs, or similar binding projects
• QML / Qt Quick application development experience
• Published crates on crates.io
• Familiarity with rcc, Qt resource handling, or QML debug/preview protocols
• Async Rust (tokio) integrated with a native event loop
• Existing Qt Account / Qt Contributor Licence Agreement already signed

About the role

Qt Bridge for Rust lets developers build Qt Quick / QML user interfaces with a pure-Rust backend — no C++ required. Rust types are exposed to the QML engine through attribute macros that generate the QMetaObject-level plumbing at compile time. The library is built on CXX and CXX-Qt for the C++/Qt interop layer.

You'll join the in-house Qt Bridge for Rust team to help design, implement and harden this library. The team already owns deep Qt platform expertise — the meta-object system, C++/QML engine internals, code generation. What we need from you is Rust expertise: idiomatic API design, the crate ecosystem, procedural macros, and cross-platform build engineering. You don't need to be a Qt expert — being able to read and reason about the C++ layer is enough.

The backlog is public, so you can see exactly what you'd be working on before you apply. Early priorities are object-model / memory-safety work and type-system / macro work.

What's NOT part of this role

• Changes to Qt itself (qtbase, qtdeclarative) — that's owned by Qt's module teams
• Product management, roadmap or release ownership
• End-user support or community management

Logistics

• B2B project-based cooperation
• Duration: at least 6 months, option to extend by next 6 months
• Start: as soon as possible
• Location: fully remote
• Process: technical interview (~90 min) covering Rust knowledge and, optionally, QtBridge-specific topics

,[Contribute production-quality Rust (and, where needed, C++) code, tests and documentation to the QtBridge Rust repository, Work on object-model, memory-safety, type-system and macro-related issues, Help design and stabilize a public library API — semver, breaking-change management, deprecation policy, Contribute to a structured threat analysis / security review of the Rust/C++ FFI surface, Keep the workspace green across Linux, MSVC and macOS, Go through code review via Gerrit against the dev branch, working closely with a Qt maintainer, Keep Jira issues current and communicate daily with the team (chat/e-mail), plus a weekly sync call] Requirements: Rust, C++, API, Linux, Testing, Security, Qt, QML