Senior Rust and C++ Developer (f/m/x)

About the Position

We are seeking a Senior Rust and C++ Developer (f/m/x) to join our dynamic team focused on memory safety migrations. You will be responsible for porting legacy C/C++ libraries to memory-safe Rust equivalents. This role emphasizes deep integration work to seamlessly bridge feature gaps between unsafe legacy code and modern Rust replacements, ensuring minimal disruption for existing consumers. The position is fully remote, allowing you to work from anywhere in Poland.

Responsibilities

• Migrating legacy C/C++ libraries to memory-safe Rust alternatives
• Building and maintaining secure C++ shims and Rust FFI wrappers
• Driving large-scale refactoring and dependency updates across numerous targets
• Performing differential testing, validation, and large-scale integration testing
• Evaluating performance and security trade-offs and providing data-driven recommendations to stakeholders
• Managing cross-team dependencies and review bottlenecks
• Structuring migrations into small, reviewable stacks to streamline approvals and reduce failures

Requirements

• Minimum 5 years of experience in software development with a strong focus on Rust and C++
• Deep expertise in unsafe code, FFI boundaries, and memory-safe migrations
• Solid understanding of memory safety, pointer stability, and cross-language interoperability
• Experience with Bazel/Blaze and dependency management
• Strong debugging skills across memory, testing, and platform-specific build issues
• Ability to communicate effectively with stakeholders and justify security-driven changes
• Advanced level of English

Nice to Have

• Experience with Crubit and C++/Rust interoperability tooling
• Background in vulnerability research or secure software development
• Familiarity with AI-assisted C/C++ to Rust migration tools (e.g., RustShift, Crigator)
• Open-source Rust contributions and experience managing third-party Rust dependencies

We Offer

• Great Place to Work
• Solid financial situation
• Contracts with the biggest brands
• Centre of internal trainings
• Many experts you can learn from
• Open and accessible management team
• Profit sharing
• Passion Sponsorship program
• Regular integration events and trips
• Comfortable and well-equipped offices
• MySii app
• Medical care

About the Company

Since 2015, we have been recognized with the Great Place to Work title every year, a prestigious award based on employees feedback. According to the study, over 92% of people working at Sii consider it a fantastic place to work. We began as a one-person start-up in 2006 and grew into a 7,500 workers company in 2025, generating revenue of PLN 2.2BN, having no debts, and being recognized as the leading IT services provider in Poland by the Computerworld TOP200 report.

Job no. JOB-XA4CR

Sii ensures that all hiring decisions are made solely on the basis of qualifications and competence. We are committed to equal and fair treatment of all, regardless of legally protected characteristics. At Sii, we promote a diverse and inclusive work environment, in full compliance with applicable anti-discrimination laws.