The application form is linked at the bottom of this post.
Role: Full-Stack Engineer
Location: King's Cross office, London (in-person or hybrid)
Type: Full-time
Salary: £35-45k (based on experience)
Want to build technology that helps save lives? We're looking for a Full-Stack Engineer to own the platform behind every Kitt. You'll work directly with the founders of a multi-award-winning, Dragons' Den-backed startup, and your code will be supporting schools and qualifying venues across the UK from day one.
Who are we?
Allergies are on the rise, and too many UK schools, workplaces and venues aren't ready when a severe reaction happens. Our co-founder Zak lives with a severe nut allergy, and in 2020 he came up with the idea for a defibrillator-style kit for allergies.
We launched the Anaphylaxis Kitt in 2023. Since then we’ve deployed 7,000+ Kitts, trained 150,000+ people and seen 60+ reactions treated. In 2025 we secured investment on Dragons’ Den, and we continue to support schools in meeting the guidance under Benedict’s Law, and qualifying businesses to bolster their health and safety policies.
Our goal is simple: a Kitt next to every defibrillator. Behind each one is our software platform, which handles kit check-ups, replenishment, incident reporting and staff training. That's where you come in.
So, what will you be doing?
Building our platform: shipping features end to end across our customer portal and API.
Solving escalated customer requests: working with our customer success team to investigate tricky data and account issues, fix the root cause and explain the outcome clearly.
Owning partner integrations: managing and improving the data integrations with our software partners, so syncs are reliable, monitored and well documented.
Powering marketing data feeds: looking after feeds such as conversion APIs (CAPI), keeping events accurate, consented and privacy safe.
Supporting regulatory validation: helping with computerised systems validation, including requirements traceability, test evidence, change control, audit trails and data integrity.
Who are we looking for?
TypeScript across the stack: you're comfortable on both frontend and backend.
React and Next.js: ideally with the App Router and Tailwind CSS.
Node.js and Express: you've designed and built REST APIs.
Relational databases: MySQL with TypeORM or a similar ORM, including migrations.
Integration experience: APIs, webhooks, scheduled jobs.
Good engineering habits: Git, pull requests, CI, and a careful approach to security and personal data.
Bonus: experience with observability tools (OpenTelemetry, Grafana), Docker, and regulated environments such as MHRA or GxP.
What's in it for you?
Competitive salary, based on experience
25 days' holiday
Real ownership: you'll shape the technical direction of a growing healthtech company
Meaningful work: your code helps keep people safe in emergencies
A great office in King’s Cross with a growing team of 12 in-person employees
Cycle 2 Work scheme
Interview Process
Apply: complete the application form below.
Screening call: a quick chat about you and the role.
Video interview: 15 to 30 minutes with the team.
Technical session: a practical 45-minute session at our King’s Cross office meeting the team and working through a real-world problem in a codebase like ours.
References: and a possible final interview.
Offer!
Want to join our team?
If you're excited to build technology that helps save lives, we'd love to hear from you. Complete the application form with your CV and tell us about a full-stack feature you've shipped, from the database right through to the UI.
