Systems Engineer

Kazimi Ug; Berlin; On-site; EUR 70,000 - 110,000; Full time

Job summary

Kazimi Ug in Berlin is seeking a systems engineer to own, maintain and innovate in our core library technology that runs on mobile apps. You will design protocols, apply cryptography and perform low-level optimizations across multiple platforms and compilers.

The role requires a strong C/C++ background, shipping production code to client devices, and a security-minded approach to adversarial testing, performance profiling and latency reduction.

Qualifications

• Strong C/C++ background with cross-compilation toolchains.
• Shipped and maintained production code on client devices.
• Fluent in concurrency, profiling and reducing latency.
• Think adversarially by default; read cryptographic protocol specs.
• Willing to learn multiple languages and frameworks across platforms.
• Able to interpret time-series graphs and assess impact of systems.

Responsibilities

• Own and maintain the core mobile library technology.
• Design protocols and apply cryptography with low-level optimizations.
• Ensure compatibility across different manufacturers, platforms and compilers.
• Analyze binaries from attacker and defender perspectives.
• Collaborate across backend, library and frontend components.

Skills

C/C++

Concurrency

Profiling

Latency optimization

Adversarial thinking

Cryptography basics

Learning multiple languages

Binary reasoning

Job description

Who We Are

We are an ambitious, committed and seasoned team of systems engineers, cryptography specialists, security analysts, data scientists, and customer-facing managers. We are looking for people that embrace an engineering mindset to build what hasn't been built and can apply their skills to solve hard, complex problems.

We develop the security infrastructure of mobile apps to allow app developers to work with clean first-party data. We believe data is critical to making informed decisions for any organization, be it in understanding the app's user base or in protecting their operations. We build software that operates in big data pipelines that spans millions of devices a day and is subject to constant and rigorous adversarial threats. We operate in a wide variety of platforms and chip architectures, each with their own quirks and faults. Above all, we deliver reliable and frictionless technologies that enhance the life of a mobile app using a cross-disciplinary tech stack. To give some examples:

• Zero-knowledge and privacy-preserving cryptographic protocols
• Embedded systems
• Networking protocols
• Compiler theory
• Data science
• Security analysis
• Deployment infrastructures
• Web analytics
• Web microservices and job queues
• Data aggregation in real-time across millions of records

In several of these areas, we work with state-of-the-art research. We actively read, implement and encourage reading research papers. You will work with seasoned engineers that have built performant production systems that process petabytes of data for billions of end users on daily basis.

About the role

We're looking for a systems engineer to own, maintain and innovate in our core library technology that runs on mobile apps. There will be a lot of protocol design, applied cryptography, adversarial thinking as well as low-level optimizations to cryptographic protocols. Everything we do on the library must support hundreds of different manufacturers, different platforms, and different compilers.

Must haves

• A strong C/C++ background and understand the different cross-compilation toolchains involved in that world
• Have shipped and maintained production code that ran on client devices
• Are fluent in concurrency, profiling, and keeping latency down
• Think adversarially by default. Almost every protocol we build is public-facing and will be attacked
• Are comfortable reading a cryptographic protocol spec and reasoning about what it does and doesn't guarantee
• Able and keen to learn new technologies: in-between the backend, library and frontend, there are about 7 different programming languages and even more frameworks
• Able to look at time series graphs and understand the real-life impact of the systems you've built and algorithms you've implemented
• Are able to look at a binary from an attacker's point of view as well as a defender's point of view
• Are able to outline how compilation pipelines work in the Android and iOS worlds

Nice to haves

• Understanding of distributed systems
• Understanding of mobile systems
• Applied cryptography experience
• Reverse-engineering experience