Full-Stack Engineer (~100K) - Startup - In Person In London
About Aisy
Aisy is an AI-native threat model intelligence platform that transforms complex vulnerability data into clear, attacker-driven priorities. By focusing on real risk, Aisy helps security and engineering teams concentrate their efforts where they matter most.
The platform leverages advanced AI to analyse threats at scale and deliver actionable insights. Aisy is building technology that modernises how organisations understand, prioritise, and address security vulnerabilities, creating a more efficient and effective security posture for its customers.
The Role
We're a pre-seed AI cybersecurity startup (currently a team of 3, growing to 6) looking for a Full-Stack Engineer to work directly alongside the founder.
This is a highly hands-on role where you'll take customer requests, break them down into technical components, and ship solutions quickly. One day you might be building authentication logic, the next generating synthetic data, and the next investigating a production issue.
Our stack:
- Python (Backend)
- React (Frontend)
- GraphQL (API Layer)
This is an in-person role based in London.
What You'll Do
- Build and ship customer-facing features end-to-end
- Translate customer requirements into technical solutions
- Work across frontend, backend, infrastructure, and data workflows
- Investigate and resolve production issues
- Collaborate directly with the founder on product and technical decisions
- Use AI tools and LLMs to accelerate development while maintaining strong engineering standards
- Help shape the engineering culture and technical foundations of the company
What We're Looking ForTechnical Excellence
We're looking for engineers with strong fundamentals across the stack. We care more about your understanding of software engineering principles than familiarity with specific frameworks.
You should be comfortable designing systems that perform reliably in production and understand how to make sound technical decisions around architecture, databases, testing, and scalability.
Strong Fit
- Strong production experience with Python
- Solid understanding of database design and data modelling
- Experience designing effective testing strategies
- Ability to build systems that scale and remain maintainable
- Experience working across the full application stack
- Comfortable leveraging LLMs and AI tools as part of your workflow
Startup DNA
We want someone who combines the engineering discipline of larger organizations with the speed and pragmatism of an early-stage startup.
You should be comfortable operating with ambiguity, wearing multiple hats, and taking ownership from customer problem through to production deployment.
Strong Fit
- Comfortable context-switching across different technical challenges
- Enjoys working in fast-moving environments
- Can independently drive projects from idea to implementation
- Takes ownership and responsibility for outcomes
Exceptional Fit
- Experience at both a well-known technology company and an early-stage startup
- Proven track record of shipping features end-to-end
- Former early employee (roughly employee #10–20) at a startup that achieved meaningful growth or traction
- Demonstrated ability to operate effectively with limited resources and incomplete information
Drive & Mindset
We care deeply about motivation and curiosity.
The strongest candidates genuinely enjoy building products, solving problems, and learning new things. They're energized by difficult technical challenges and take pride in their craft.
We're looking for someone whose primary focus is building great technology and helping the company succeed.
Strong Fit
- Passionate about software engineering and product development
- Self-motivated and proactive
- Learns quickly and enjoys tackling unfamiliar problems
- Comfortable receiving and acting on feedback
Exceptional Fit
- Active open-source contributor
- Maintains meaningful side projects
- Writes technical content, blogs, or gives talks
- Has repeatedly demonstrated the ability to learn new technologies or domains and deliver results quickly
- Has intentionally chosen high-growth, challenging environments over more comfortable alternatives
Experience & Trajectory
We're not looking for the most experienced engineer. We're looking for someone with enough experience to have developed strong instincts while remaining adaptable, hands-on, and growth-oriented.
Variety of experience matters more than total years worked.
Strong Fit
- 2–6 years of software engineering experience
- Exposure to multiple products, teams, or business environments
- Increasing ownership and responsibility throughout career progression
Exceptional Fit
- 3–5 years of experience across multiple engineering environments
- Experience at 3+ companies
- Combination of:
- Large technology company experience
- Early-stage startup experience
- Demonstrated ability to adapt quickly to new technologies, industries, and ways of working
- Strong engineering judgment developed through diverse real-world experience
Why Join Aisy?
- Work directly with the VC backed founder
- Significant ownership and impact from day one
- Opportunity to help define the product and engineering culture
- Exposure to cutting-edge AI and cybersecurity challenges
- Fast learning environment with broad technical scope
- Chance to join at the earliest stage of a company with significant growth potential
This role is ideal for an engineer who wants to build quickly, learn constantly, and have a meaningful impact on both the product and the company.
