Senior Backend Engineer

Xact Placements Limited; City Of London; Remote; GBP 70,000 - 90,000; Full time

Job summary

A leading cybersecurity firm is seeking a Senior Backend Engineer to build scalable backend systems for their innovative platform. The role offers competitive salary, remote working, and the opportunity to collaborate with top industry talent. Candidates should have 5+ years of experience with strong Python skills and a background in microservices architecture.

Benefits

Competitive salary + benefits

Ownership and impact in a high-growth scale-up

Fast-tracked career growth

Remote-first culture

Qualifications

• 5+ years' experience designing and maintaining mission-critical backend applications.
• Strong Python engineering skills with a track record of building performant, maintainable systems.
• Solid background in microservices architecture.

Responsibilities

• Designing and building backend services and data pipelines for a cybersecurity platform.
• Architecting scalable microservices and APIs to process large volumes of security data.
• Continuously improving systems performance and monitoring.

Skills

Python engineering skills

Microservices architecture

Postgres

MongoDB

Event-driven architectures

Asynchronous workflows

Clean coding practices

Job description

Senior Backend Engineer High-Growth Cybersecurity Scale-Up Fully Remote (Global)

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 $29M+ in 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

What they're looking for:

• 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.

Why join?

• 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.

Interested? Let's talk - this one won't be around for long.