We are looking for skilled risk-takers with a penchant for brilliance, graft and problem-solving.


We’re using cutting-edge technology to solve a thorny problem in a really different way.

Become part of something new.


We pay competitive salaries with startup package benefits and a great base in the centre of London to make your hard work worthwhile.


We are an equal opportunity employer and value diversity at our company. We do not discriminate on the basis of race, religion, colour, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status.

Lead Engineer

Hiring now, October 2017.

Get in touch.

Circadian needs a lead engineer to ensure scalability, reliability and security are embedded into the product early, in addition to helping advance Quill’s current functionality.

Quill works today, but it's a prototype. Your job will be to re-tool the back-end/database so that the service stays fast, cheap and reliable as we add users.

Ideally you will have some leadership experience within a tech start-up and can express yourself fluidly – we’re going to have to explain to people why they want to invest in us.

Apply if you are an experienced engineer who is now interested in building a scalable business.

What we’re looking for
Knowledge of cloud computing (ideally AWS), scaling and database handling;
Understanding of data-science, with emphasis on machine-learning approaches (ideally using Python, but not critical: whatever gets the job done);
Familiarity with client-side web development (JavaScript/JQuery etc.).

Experience with Behavioural Biometrics (ideally) or Identity / Authentication;
Cybersecurity experience, particularly as it applies to personal data;
Familiarity with SaaS business models.