Senior Backend Engineer - Python

Senior Backend Engineer | High-Growth Cybersecurity Scale-Up | Fully Remote (UK based)

Are you ready to build the core systems that power one of the fastest-growing cybersecurity platforms on the planet?

This is your chance to join a research-driven, venture-backed security scale-up that's trusted by some of the world's biggest enterprises and critical infrastructure providers. Recognised by Gartner, armed with funding, and scaling aggressively worldwide, they're on a mission to reshape how organisations stay ahead of real-world cyber threats.

As a Senior Backend Engineer, you'll play a key role in building scalable, high-performance backend systems that ingest, process, and serve data on millions of assets-helping global security teams uncover exposures before attackers do.

What you'll be doing:

• Designing and building backend services and data pipelines powering a cutting-edge cybersecurity platform

• Architecting scalable microservices and APIs to process massive volumes of security data

• Working closely with product and frontend teams to integrate backend services into the platform experience

• Continuously improving systems performance, deployment, and monitoring as the company scales globally

• 5+ years' experience designing and maintaining mission-critical backend applications

• Strong Python engineering skills, with a track record of building performant, maintainable, and testable systems

• Solid background in microservices architecture

• Proficiency with Postgres & MongoDB (relational + non-relational)

• Experience with event-driven architectures and asynchronous workflows (Kafka, Airflow, etc.)

• Solid coding practices (clean, testable, automated)

• The mindset of a builder: thrives in fast-paced startup environments, takes ownership, solves complex challenges

Bonus points if you've worked with: large-scale data processing, ETL pipelines, cloud deployments, or DevOps/CI-CD practices.

Competitive salary + benefits Ownership and impact in a high-growth cybersecurity scale-up Work with cutting-edge technology and some of the brightest minds in the industry Fast-tracked career growth with internal progression opportunities Remote-first culture with the best tools and kit to succeed

This is more than a backend engineering role - it's a chance to be part of a team building technology that helps some of the world's largest enterprises stay ahead of attackers