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Build38 Logo Build38 · IT - Software Development

LLVM Compiler Engineer

Spain, Barcelona · Job Posted February 17, 2026
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Job Description

Build38 is a cyber security start-up that takes care of securing mobile apps. We enable all sorts of solution providers (from car manufacturers to banks, from public transit operators to identity providers) to deliver their mobile use cases in a secure manner. We already protect millions of Android and iOS endpoints with our SDK, which, together with our backend analytics platform, provides the most comprehensive mobile app security solution in the market. We are looking for a “LLVM Compiler Engineer” with 4-6 years of experience for our growing team. You will work closely with the development team in language implementation and optimization in the LLVM compiler framework.

Job Responsibility

  • Extend the open-source LLVM plug-in “o-mvll” to support the in-house obfuscation solution
  • Analyze the requirements, research, design, enhance and implement different components of the toolchain to meet the customer’s needs
  • Develop new obfuscation passes
  • Research new techniques and mechanisms for applying obfuscation to mobile applications

Requirements

  • Bachelor’s Degree or above in Computer Science, related technical field, or equivalent work experience
  • 4+ years of technical engineering experience with the LLVM compiler toolchain internals
  • Experience coding in low-level languages such as C or C++
  • Experience working with assembly-level code and manipulating executable files, preferably with Android / ARM and iOS / ARM / Mach-O
  • Experience working on compilers, runtimes, or programming languages

Nice to have

Preferably experience with XCODE, NDK, Bitbucket pipelines and Jenkins

What we offer

  • Optimized onboarding
  • Enthusiastic team
  • Internationality – three locations worldwide with employees on 3 continents
  • Simplicity
  • Greenfield – where you can explore and bring in your experience
  • Open-source impact & visibility – contribute in public on GitHub and grow your reputation with the community
  • Well-known customers – from the German and international economy
  • Beautiful office spaces in Barcelona with regular team/community events (breakfast, lunch, beers…)
  • Good transport connections – easy to reach by public transport
  • Attractive performance-based remuneration model
  • Flexible working hours & Hybrid working
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