Low-level Engineer
Rein is looking for a Low-level Engineer
Why Rein?
Rein was founded to solve one of cybersecurity's toughest challenges: understanding how AI agents and applications behave in real time.
Our technology helps AI and Application security teams see risk as it really is. The result: faster, smarter security decisions based on what's actually happening inside your apps.
Backed by leading VCs, Rein is already trusted by companies across banking, energy, and SaaS.
We're looking for people who love solving big challenges quickly and creatively. People who are comfortable being technologically versatile, jumping across problems and stacks when needed, and who care about seeing their work make a real impact on customers. Most of all, teammates who push themselves, support each other, and enjoy building something meaningful together.
Learn more about us here: https://reinsec.io/
What You’ll Do
Solve complex, high-impact problems that require a deep understanding of runtime and OS internals
Write highly efficient production-grade code, primarily in C++, and also in other languages such as Python, Node.js, Java, and more
Be part of a small, fast-moving team where you'll have real ownership and influence, and the opportunity to push forward ideas and practices that matter to you
Design and build robust internal infrastructure that enables rapid execution without compromising quality
What You Bring
5+ years of professional, hands-on C++ experience, building and maintaining complex systems
Proven experience developing production-grade software, with strong emphasis on correctness, reliability, performance, and maintainability
Solid understanding of Linux or Windows OS internals
Excellent problem-solving and debugging skills
Solid testing discipline: writing and maintaining unit, integration, and end-to-end tests
Ability to quickly onboard into an existing codebase and contribute effectively
Experience with various runtime environments (python, nodejs, java) - Bonus
Who You Are
A builder who enjoys turning rough ideas into working systems
Comfortable with ambiguity and fast pace - you figure things out and move forward
Technically versatile - you jump across problems and stacks when needed
Strong ownership mentality - you care about quality and real impact on customers
A great teammate who pushes themselves and supports others
What We Offer
Competitive compensation, equity, and benefits
A hybrid work environment
Real ownership and influence over the product and engineering culture
If this sounds like a fit, we’d love to hear from you: careers@reinsec.io