Mid-Senior Founding Full-Stack Product Engineer | London, On-site

Mid-Senior Founding Full-Stack Product Engineer | London, On-site

London Full-Time 80000 - 98000 £ / year (est.) No working from home possible
Cross Border Talents

At a Glance

  • Tasks: Own the product end-to-end and develop AI-powered workflows.
  • Company: Join a pioneering AI-native cybersecurity startup backed by top investors.
  • Benefits: Competitive salary, meaningful equity, and direct access to founders.
  • Other info: Fast-paced environment with high ownership and growth opportunities.
  • Why this job: Make a real impact in AI and cybersecurity from day one.
  • Qualifications: Strong full-stack experience with TypeScript, React, and Node.js.

The predicted salary is between 80000 - 98000 £ per year.

Our Client is building the world's first AI-native cybersecurity operating system. As increasingly capable AI systems become part of critical infrastructure, security challenges are evolving faster than traditional solutions can keep up. Our Client is developing next-generation defensive systems powered by AI-native architectures, advanced research, and novel approaches including LLM Zero Knowledge Verifiers (ZKVs). Backed by leading investors including Entrepreneur First and the Sequoia Scout Fund, alongside strategic angels from companies such as Meta, Palantir, Isomorphic Labs, Asana, Samsara, and Astranis, the company is building from offices in London and San Francisco.

Location: London, United Kingdom (On-site)

Employment Type: Full-Time

Level: Mid-Senior

Compensation: Competitive Salary + Founding Equity

Relocation Support: Available for Candidates with Work-Permit

What You'll Do

  • Own the Product End-to-End; Build and maintain the full product experience
  • Develop frontend, backend, and AI-powered workflows
  • Design scalable, secure, and reliable systems
  • Shape product architecture and engineering standards
  • Full-Stack Development; Build modern web applications using TypeScript and React
  • Develop backend services using Node.js
  • Design and maintain developer-friendly APIs
  • Ensure security, performance, and reliability across the platform
  • AI Product Development; Collaborate closely with AI engineers
  • Integrate AI and LLM capabilities into production products
  • Transform research outputs into customer-facing functionality
  • Explore how AI-generated code and autonomous systems fit into enterprise environments
  • Enterprise Platform Engineering; Build secure systems suitable for enterprise deployment
  • Support compliance and security requirements
  • Improve platform scalability and reliability
  • Design infrastructure capable of supporting long-term growth

Requirements

  • Strong full-stack engineering experience
  • Deep expertise with TypeScript, React, and Node.js
  • Experience designing and building RESTful APIs
  • Experience shipping production-grade software
  • Strong architectural and product thinking
  • Experience working in fast-moving startup environments
  • Comfort operating with significant ownership and autonomy

Preferred Experience

  • AI or LLM product integrations
  • OpenAI, Anthropic, or similar production AI systems
  • Cybersecurity or enterprise SaaS environments
  • Cloud infrastructure experience (Azure, AWS, or GCP)
  • Docker and containerized deployments
  • CI/CD pipelines and GitHub Actions
  • Terraform or Infrastructure as Code
  • Rust experience
  • Previous founding engineer experience

Ideal Candidate Profile

  • Think like product owners
  • Use AI tools extensively in their development workflow
  • Have strong opinions on architecture and software design
  • Enjoy working directly with customers and founders
  • Thrive in high-ownership environments
  • Prefer building over maintaining
  • Move quickly while maintaining quality

What We Offer

  • Competitive compensation package
  • Meaningful founding equity
  • Direct access to founders and leadership
  • High-impact ownership from day one
  • Opportunity to work on cutting-edge AI and cybersecurity problems
  • Fast-moving, high-performance environment
  • Ability to influence both product and technical strategy

If you're excited about building AI-native cybersecurity products, owning systems end-to-end, and helping define the future of AI security infrastructure, we'd love to hear from you...

Mid-Senior Founding Full-Stack Product Engineer | London, On-site employer: Cross Border Talents

Our Client is an exceptional employer, offering a dynamic work culture that fosters innovation and collaboration in the rapidly evolving field of AI-native cybersecurity. With competitive compensation, meaningful equity opportunities, and direct access to leadership, employees are empowered to take ownership of their projects from day one while working on cutting-edge technology in a fast-paced environment. Located in London, the company provides a unique chance to influence both product and technical strategy, making it an ideal place for those looking to make a significant impact in their careers.

Cross Border Talents

Contact Details:

Cross Border Talents Recruitment Team

StudySmarter Expert Advice🤫

We think this is how you could land Mid-Senior Founding Full-Stack Product Engineer | London, On-site

Get Involved in the Cybersecurity Community

Diving into the cybersecurity community is key for landing that full-time gig. Join forums like Reddit's r/cybersecurity or attend local meetups to connect with industry veterans and other job seekers. Networking is everything in this field—don’t just be a passive lurker!

Show Off Your Skills with Capture the Flag Competitions

Participate in Capture the Flag (CTF) competitions; these are not just a fun way to boost your skills but also a chance to showcase your talent to potential employers. Many companies, including Cross Border Talents, love seeing candidates who actively engage in these challenges.

Tailor Your Online Presence

Make sure your LinkedIn and any professional profiles reflect your cybersecurity expertise. Share your projects, whether they’re personal or from a previous role, to catch the eye of hiring managers. This is how they’ll find your passion and commitment to the field!

Apply Directly Through Cross Border Talents

Don’t forget to head straight to our website and check out any openings for cybersecurity roles at Cross Border Talents. Applying directly can sometimes give you an edge, especially if you can mention that you've been following our work or engaging in the community.

We think you need these skills to ace Mid-Senior Founding Full-Stack Product Engineer | London, On-site

Full-Stack Development
TypeScript
React
Node.js
RESTful APIs
Architectural Thinking
Product Thinking

Some tips for your application 🫡

Show off your technical skills:In cybersecurity, it's crucial to highlight your technical prowess. Make sure your CV showcases specific skills like network security, penetration testing, or threat analysis. If you have relevant certifications (like CEH or CISSP), pop those on the front page to grab attention!

Tailor your portfolio for the role:Even for a full-time role, a portfolio can set you apart. If you've worked on any cybersecurity projects—be it CTF challenges, security assessments, or research papers—include these in your application. This demonstrates not just your skills, but also your hands-on experience!

Use real-world examples:When writing your cover letter, don’t just stick to your qualifications. Share real-world examples of how you’ve tackled security issues or vulnerabilities. This gives the hiring team at Cross Border Talents insight into your practical problem-solving abilities and makes your application memorable.

Demonstrate your passion for cybersecurity:Cybersecurity is an ever-evolving field, so show us that you’re always learning! Mention any recent courses, webinars, or industry events you’ve attended. This not only exhibits your enthusiasm but also signals to Cross Border Talents that you’re committed to staying ahead in the game.

How to prepare for a job interview at Cross Border Talents

Sharpen Your Technical Skills

For a role in cybersecurity, it’s essential to be up-to-date with the latest tools and techniques. Brush up on your knowledge of firewalls, intrusion detection systems, and vulnerability assessment tools. Be ready to discuss specific scenarios where you’ve applied these skills, as hands-on experience can really set us apart in interviews.

Prepare for Scenario-Based Questions

Expect the interviewers at Cross Border Talents to throw in some hypothetical situations to see how you’d handle them. Think about common security breaches or incidents and be prepared to explain how you would respond. This not only shows your problem-solving skills but also your understanding of real-world cybersecurity challenges.

Highlight Your Certifications

Certifications like CompTIA Security+, CISSP, or CEH can give you a significant edge in a full-time role in cybersecurity. Make sure to mention these during your interview and be prepared to discuss what you learned through those certifications and how they relate to the position at Cross Border Talents.

Show Your Passion for Cybersecurity

Since you’re going for a full-time gig, showing genuine enthusiasm for the field can make all the difference. Share any personal projects, blogs, or communities you’re part of that relate to cybersecurity. This not only showcases your passion but also your commitment to staying engaged in this ever-evolving field.