Full Stack Engineer at Ossprey
Join us in building the future of software supply chain security
https://ossprey.com/careers/engineer.html
* Location: UK
* Type: Full-time
* Start: ASAP
* Comp: Competitive salary + options (depending on role/scope)
* Hiring for: Multiple founding-level engineering roles
About Ossprey
* Ossprey is a UK based cybersecurity company building real time protection against malicious activity in open source software and software supply chains. We have recently closed our pre seed round, with an announcement coming soon, and we are moving from closed beta to public launch.
* With a closed beta already in place, we are scaling the engineering team to build the platform, expand detection coverage, and shape a product experience that makes open source risk obvious and actionable.
Where did we begin?
* In 2021, a major compromise in the NPM package UAParser affected tens of thousands of users, from individual developers to large organisations including financial services and Facebook.
* We were asked to look at the problem and work out how to stop it happening again. The conclusion was clear. It is too difficult for a single company to solve alone, and there were no viable commercial options.
* By 2023, these attacks were becoming more frequent. We revisited the problem and reached the same conclusion, while the risks continued to grow.
* So we decided to build the solution ourselves. In early 2025, we started Ossprey to tackle the problem properly and make open source supply chain protection practical for everyday engineering teams.
* Our team has decades of cybersecurity experience. One of our biggest frustrations with the industry is how often security products improve security at the cost of employee productivity. We take an engineering first approach.
* We believe it is possible to make engineers more productive and more secure at the same time, and that is what we are building at Ossprey.
Why are you called Ossprey?
* We chose Ossprey as we are protecting Open Source Software from being preyed upon. Hence Ossprey Security (we love a pun).
* Our CEO is also an avid bird watcher.
Why Join Now
* This is a true founding-engineer opportunity: you’ll shape the product, architecture, and engineering culture at the moment it matters most.
* Real momentum, early enough to matter: we have funding, an MVP, and customers waiting to use the product. You’ll help take this to public release and beyond.
* High-leverage problems: analysis pipelines, detection quality, explainability, and performance/cost trade-offs at scale.
* Security with taste: we care about signal over noise and building a product customers trust (not just a scanner that generates alerts).
* Ownership and impact: you’ll run meaningful parts of the roadmap end-to-end and see your work land with users quickly.
What We’re Looking For
We hire for ability and judgement over specific tools. If you learn quickly, take ownership, and can drive ambiguous problems through to completion, you will thrive here.
We are looking for people who are looking to take ownership and make smart decisions for the company.
The choices you make in code can shape our platform for the next five years and beyond. We need engineers who can move fast while still making decisions that keep us moving fast as the product scales in size and complexity.
* Strong ownership: You take large problems, define the plan, and deliver end-to-end
* Prioritisation: You identify what must be done now vs what can wait, and communicate trade-offs clearly
* Speed with judgement: You ship quickly using an iterative approach while protecting security and customer trust
* Remote-first mindset: Strong written communication, documentation habits, and proactive knowledge sharing
* Customer empathy: Comfortable engaging with customers to understand their problems and turn feedback into shipped product
Tech Stack
You don’t need experience with everything listed, but this is what you’ll be working with:
* Python: backend and ML Ops
* JavaScript/React: frontend
* AWS: product infrastructure
* Azure: AI tooling and related services
* LLM/ML: experience working with and managing LLMs
Work Setup
Remote-first with UK office hours and flexible working. Quarterly in-person meetups and occasional UK travel for workshops and team events. Customers site visits may be required in the future.