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

Expected, Rust, C++, Blaze, Memory Management

Optional, rustshift, crigator, crubit

About the project, We are looking for an experienced Software Engineer to join a dynamic team focused on memory safety migrations. You will be responsible for porting widely-used, legacy C/C++ open-source 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.

Your 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

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

Optional, 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

What we offer, Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas, Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market, We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022, Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more, Comfortable workplace – class A offices or remote work, Dozens of fascinating projects for prestigious brands from all over the world – you can change them thanks to Job Changer application, PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers, Investment in your growth – meetups, webinars, training platform and technology blog – you choose, Fantastic atmosphere created by all Sii Power People

Recruitment stages, Send your CV, Talk to us about your expectations, Learn more about our projects and choose the best, Start your adventure with Sii!

Sii Sp. z o.o., Sii is the leading technology consulting, digital transformation, engineering, and business services vendor in Poland. We already employ more than 7 300 professionals and implement projects in a variety of industries for clients from many countries around the world. The Great Place to Work title, won 10 times in a row, proves that at Sii, we create a friendly work environment., , Sii ensures that all employment-related decisions are made solely on the basis of qualifications and competencies. We are committed to equal treatment of all individuals, regardless of any protected characteristics, and promoting a diverse and inclusive work environment.

This is how we work,