Full Stack Developer

83zero Limited; Remote; GBP 80,000 - 100,000; Full time

Job summary

A UK cyber security startup is looking for a Full Stack Developer who will build and ship product features across the stack in a remote-first environment. You will develop reliable, well-tested APIs in Python and intuitive UIs in React. A strong commercial background in web applications, hands-on AWS Serverless experience, and an interest in cyber security are essential. This role offers a competitive salary between £80,000-£100,000 and equity opportunities.

Benefits

Equity opportunity

Flexibility and autonomy

High impact work

Qualifications

• Strong commercial experience building web applications with React and Python.
• Hands-on experience with AWS Serverless setup.
• Confidence integrating external APIs, including modern LLM/AI services.

Responsibilities

• Build and ship product features across the stack (UI → API → cloud).
• Develop back-end services in Python, delivering reliable, well-tested APIs.
• Build responsive, intuitive front-ends in React.

Skills

React

Python

AWS Serverless

API integration

Usability focus

Interest in cyber security

Job description

Full Stack Developer

Remote-first (UK) | £80,000-£100,000 + equity

We're hiring for a UK cyber security startup building a platform that helps organisations detect malicious open-source code and secure their software supply chain in real time.

The product continuously scans dependencies, surfaces risk clearly, and helps teams prevent compromised packages from entering the codebase - without slowing engineering down.

If you're a strong full stack engineer who enjoys building clean, scalable product and you're curious about cyber security, this is a chance to build something genuinely important.

Why this is interesting (especially if you like cyber)

Open source and third-party dependencies are now one of the biggest attack paths for modern organisations.

This team is tackling that head-on with a platform designed for both engineering and security teams - offering malware detection, deep dependency visibility, and policy enforcement to stop bad code early.

They're also part of a leading UK cyber security accelerator programme, supporting the next generation of high-growth security startups.

The role

You'll join a small, high-output engineering team and build customer-facing features end-to-end - front to back to cloud.

You'll ship frequently, own features, and have real influence over architecture and product direction.

This role includes LLM exposure, but the emphasis is practical integration via APIs (plugging LLM capabilities into workflows), not building research-heavy or RAG-first systems.

What you'll do

• Build and ship product features across the stack (UI → API → cloud)
• Develop back-end services in Python, delivering reliable, well-tested APIs
• Build responsive, intuitive front-ends in React
• Work within an AWS serverless environment (event-driven services, APIs, scalable data patterns)
• Integrate external services (including LLM APIs) to enhance workflows and automation
• Collaborate closely with founders and product to shape requirements and deliver fast
• Improve reliability, performance, monitoring, and developer experience as the product scales

What you'll be building (product context)

• The platform focuses on software supply chain security, including capabilities such as:
• Detecting malicious or tampered open-source packages
• Providing deep insight into dependency trees and hidden risk
• Preventing compromised code from reaching production environments
• Helping organisations enforce security policies early in the SDLC

Who you are

• You're a capable Full Stack Developer who has:
• Strong commercial experience building web applications with React and Python
• Hands-on experience in an AWS Serverless setup (Lambda, API Gateway, DynamoDB, event-driven architectures)
• Confidence integrating external APIs, including modern LLM/AI services
• A product mindset: you care about usability, clarity, and shipping value
• Comfort working in a startup environment - ownership, pace, and ambiguity
• An interest in cyber security or secure software development (no need to be an AppSec specialist already)

Tech stack (high level)

• Frontend: React
• Backend: Python (APIs/services)
• Cloud: AWS Serverless
• AI: LLMs via API integrations (workflow enhancement + automation) experience is beneficial

Package

• £80,000-£100,000 base salary (depending on experience)
• Equity opportunity
• Remote-first across the UK with flexibility and autonomy
• High impact: your work will directly shape the platform and customer experience

Interested?

If you're excited by full stack engineering and want to build meaningful software in cyber security, get in touch with a CV / LinkedIn and a quick summary of what you've been working on recently (especially anything serverless or API integration heavy).