TL;DR

Systems Software Engineer (Rust): Designing, implementing, and optimizing systems-level components of the %hirify_global% SDK with an accent on performance, memory usage, and stability. Focus on building tooling to validate real-time constraints, numerical correctness, and cross-language consistency.

Location: Berlin, Germany

Company

%hirify_global% is building the reliability layer for Voice AI, the system that closes the gap between raw audio input and reliable machine understanding in production.

What you will do

Design, implement, and optimize systems-level components of the %hirify_global% SDK.
Improve the performance, memory usage, and stability of the Airten real-time inference engine.
Maintain and expand our C API and public C library generated from the our internal Rust codebase.
Develop and improve the SDK’s telemetry and usage monitoring systems.
Write and maintain high-quality technical documentation for SDK APIs, internals, and integration guides.
Build tooling to validate real-time constraints, numerical correctness, and cross-language consistency

Requirements

Strong experience in systems programming, ideally with Rust
Solid understanding of C/C++ interoperability, ABIs, and FFI design
Experience building or maintaining SDKs, libraries, or runtimes used by external developers
Familiarity with real-time systems, performance optimization, and memory management
Experience writing tests and benchmarks for low-level or performance-critical code
Comfortable working across multiple platforms (Linux, macOS, Windows, WASM)

Nice to have

Experience with digital signal processing (DSP) or audio pipelines
Familiarity with ML inference runtimes or deploying neural networks in production
Exposure to real-time audio constraints (latency, jitter, streaming workloads)

Culture & Benefits

Opportunity to work at a rapidly growing Voice AI startup, backed by top investors.
Competitive salary package, additional benefits and stock options, enabling you to take part in the company’s success.
Dynamic, fast-paced environment with passionate and collaborative colleagues.
Groundbreaking startup at a pivotal growth stage, making a real difference in how people experience audio.
Take full ownership of projects and ship fast.
World-class team of engineers and builders with ample room for professional growth.