Remote Senior Backend Developer

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

Job summary

A high-growth cybersecurity scale-up in the UK is seeking a Senior Backend Engineer. In this fully remote role, you will design scalable backend systems and work closely with product and frontend teams. The ideal candidate has over 5 years of experience, strong Python skills, and a solid background in microservices architecture. This position offers competitive salary and the opportunity to impact a fast-growing company with cutting-edge technology.

Benefits

Competitive salary + benefits

Fast-tracked career growth

Remote-first culture

Qualifications

• 5+ years’ experience designing and maintaining mission-critical backend applications.
• Proficiency with event-driven architectures and asynchronous workflows.
• Ability to thrive in fast-paced startup environments.

Responsibilities

• Design and build backend services and data pipelines.
• Architect scalable microservices and APIs.
• Integrate backend services with product and frontend teams.

Skills

Strong Python engineering skills

Microservices architecture

Postgres & MongoDB proficiency

Event-driven architectures

Solid coding practices

Job description

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

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.