Senior Systems Software Engineer

Role Summary

We are looking for a Senior Systems Software Engineer to join our Central Technology team in our London HQ, to start designing and building out our high-performance processing pipelines that sit at the trust layer of our technology.

Key Responsibilities

• Design and implement high-performance content-processing services in C++ or Rust — owning correctness, throughput, latency and memory behaviour from design through production operation.
• Build the provenance layer: content hashing, digital signing and verification, and tamper-evident chain-of-custody structures that let the platform prove where content came from and that it's unaltered.
• Build automated content-safety processing at the data path: content inspection, policy evaluation and classification, including consuming ML model outputs safely within the processing stages.
• Define and hold the performance envelope for these components — profile, benchmark and optimise hot paths — and write the specifications other engineers build to.
• Partner with security and compliance so that what the platform emits meets its COPPA, GDPR and brand-integrity obligations at the data-processing layer.
• Work with infrastructure engineers on how these services deploy and scale — containerisation, resource limits, scaling behaviour, network I/O in the cloud.
• Define the interfaces and data contracts through which ML inference outputs are consumed correctly and safely within the processing stages.
• Produce the component documentation and integration guidance that platform engineers rely on to consume or extend your work.

Required Qualifications

• Strong, hands-on experience writing production C++ or Rust in a performance-sensitive context.
• Experience building and optimising data-processing services — streaming, batch or hybrid.
• Working knowledge of concurrency and parallelism for high-throughput work.
• A solid grasp of security engineering for systems-level code.
• Comfort operating across the stack, from low-level component design to integration with cloud-deployed services.
• Clear technical writing skills.