Senior Backend Developer - Remote - £110k + Equity

Senior Backend Developer - Remote - £110k + Equity

Limitless has been exclusively engaged by one of the fastest-growing start-ups, building a first-of-its-kind enterprise security platform for the AI era.

Founded by red team and blue team experts, they stop advanced attacks, secure AI usage, harden identities and prevent data loss, all from inside the browsers people already use, with no migration needed. It’s a sharp product solving a very real problem, and the growth reflects that.

The engineering and product team is now 28 strong and fully remote. They’re looking for a Senior Backend Engineer to design, build and run the large-scale, high-performance systems behind the platform. You’ll have a real hand in how it scales, how reliable it is and how the engineering team works as it grows.

What you’ll be doing:

• Building and maintaining scalable backend services in Python on AWS serverless infrastructure
• Shipping quickly without cutting corners, backed by solid testing and clear documentation
• Reviewing code and giving feedback that raises the bar for the whole team
• Working closely with engineers, designers and product to turn ideas into reliable features

What they’re looking for:

• Expert-level Python and a track record of building and scaling large production systems
• Hands-on AWS serverless experience and infrastructure as code (they use AWS CDK)
• Relational and NoSQL experience (PostgreSQL and DynamoDB)
• Someone self-directed who owns features end to end, from concept through to production
• A genuine focus on the user and how your work affects their experience

💰 Package: £105k + stock options

💻 Tech stack: Python, AWS serverless, AWS CDK, PostgreSQL, DynamoDB

🚀 Industry: Cybersecurity

🏠 Fully remote: work from home or a co-working space anywhere in the UK

🧩 Interview process: Fully remote and transparent, with an intro call, a career projects session where you present two projects you’ve worked on, a panel interview, then the offer stage

👏 Team size: 28 across engineering and product

🎁 Benefits: Bupa private medical, life assurance, 4% employer pension (salary sacrifice), uncapped PTO, internet reimbursed, annual allowance for local meetups, and an all-expenses-paid annual offsite to a secret destination

A brilliant business with a deeply experienced engineering team and a real people-first approach to flexibility and work-life balance.

Apply now or drop me a message for a confidential chat.

Senior Backend Developer - Remote - £110k + Equity