Senior Compiler Engineer Position

About Polyverse:

Polyverse changes the economics of hacking by making safe, economical changes to code patterns hackers need to exploit. For example, reordering functions in memory defeats many of the most devastating fileless and zero-day attacks. We implement these changes by tweaking or extending compilers, linkers, loaders, intermediate passes, and other parts of the execution environment.

Polymorphic Linux, our flagship product, has been validated by the U.S. Department of Defense to mitigate zero-day memory exploits. Learn more at

What You'll Be Working On

Core to Polymorphic Linux are modifications to GCC, LLVM and other compiler tool chains. Compilers make many choices. For example, register assignment often has a choice of registers, and instruction schedulers often have a choice of instructions to schedule next. Typical compilers use fixed and thus hackable patterns, but ours break ties randomly at every compilation. By recompiling Linux for every customer, no two clients run the same executables, which foils hacks built on ROP gadgets.

We are expanding our toolset across platforms, compilers, architectures and implementations (e.g., plug-ins). As a Senior Compiler Engineer, you'll be responsible for implementation from concept/design to testing/performance to productization/support.

Here are a couple of examples of past projects:

  • We changed PHP's parser and lexer to use a syntax customized for each individual client machine and, naturally, made parallel changes to that client's PHP scripts. They work exactly like the originals, but code injection hacks from outside use a mismatched syntax and thus fail.
  • We have built machine-code rewriters that accept a linked executable and relocation metadata and emit an equivalent binary with safe, random changes. And we have done likewise to change executables as they start up at load-time and on-the-fly during execution.

You will also be working closely with the build farm and serving team. Polyverse runs the largest build farm in the world, constantly building unique copies of Alpine, CentOS, Fedora, Red Hat and Ubuntu.

Who We're Looking For

Does a fast-paced workplace that constantly pushes you well outside your current skill set excite you? At Polyverse, you'll be challenged to solve diverse problems that will disrupt the cybersecurity industry!

  • Working deep inside compilers, optimizers, linkers, loaders, and running programs. Experience with machine-level debuggers, profilers, interpreters, and emulators has come in handy too.
  • Compiler intermediate representations, Intel and ARM assembly and machine code, object-file formats, and relocation data.
  • The mechanisms that load and run executables on various Unix and Windows OSs.

So if this sounds exciting, and you're fearless and a fast learner, you'll love working at Polyverse!

You May Be the Right Fit If You...

  • have a strong formal academic training in computer science (or equivalent work experience)
  • have an expert understanding of compiler architecture and compiler implementation techniques
  • tend to obsess over code correctness, simplicity and performance
  • have a minimum of 4 years of hands-on experience in complex compiler code generation and optimization in at least one major general-purpose compiler for C/C++ for x86 or any ISA platform
  • have experience with machine-code generation/compiler back-ends (e.g., register allocation, instruction scheduling)
  • have 8+ years development experience with a proven track record of delivering high quality production software
  • have 4+ years of software design and programming experience in C/C++ for development, debugging, testing and performance analysis.
  • are proficient in scripting languages, assembler, open source development tools. Experience with simulation tools and performance analysis tools a plus.
  • are a great teammate with strong analytical, communication, problem solving, debugging, and troubleshooting skills
  • have a Github account that shows your chops

About Us

We’re a team of close-knit technologists and engineers whose skills are matched only by our dedication to solving the global cybersecurity crisis. By bringing together top engineering and management talent from such firms as Microsoft, Amazon, Google and the academic world, Polyverse has built a groundbreaking product that makes large-scale data breaches all but impossible. We offer a flexible work environment, no politics, research and learning opportunities and free lunches!

Thank you for considering Polyverse! If you think you fit the bill, please email us your résumé and cover letter (optional) at*

*Polyverse provides equal employment opportunities (EEO) to all employees and applicants for employment without regard to race, color, religion, gender, sexual orientation, national origin, age, disability, genetic information, marital status, amnesty, or status as a covered veteran in accordance with applicable federal, state and local laws. Polyverse complies with applicable state and local laws governing non-discrimination in employment in every location in which the company has facilities.

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