Senior Backend Developer (Ruby On Rails)

Sweatcoin is a London-based and well-funded scale-up with a team of 100 and the mission to make the world more physically active.
Our iOS and Android apps have more than 100MM installs, 15M+ active users, more than 300 commercial partners and confirmed by the independent academic research ability to make our users up to 20% more active.
If you are interested in solving complex problems, then we are looking forward to seeing you be a part of our team!
Now we have 160K requests per minute, half are writing, our database is growing by 1% per day, 5 million users a day send 15 million records, about 50 million requests to the database!
In addition, you will work on the development of the new features for the project, work on improving internal algorithms, optimization/scaling of the service, protection against fraud and security, analytics, a / b testing and API projects.
Who we are looking for: Extensive experience in robust Ruby & Rails API design & development Ability to carry unclear product requirements to stable, clear, deployed features Ability to work autonomously, determining what needs to be done and why with little-to-no oversight (think managers of one ) Habitually ensuring new app behaviors are covered by specs to ensure stability Experience working on high-loaded projects involving cross-functional collaboration Ability to find a compromise between perfect code and fast delivery English language not lower than Intermediate Tech stack: Ruby 3 Rails 7 Puma PostgreSQL Redis Sidekiq GCP & AWS Why join us?
Remote-friendly & Flexible working hours.
The flexibility is incredible, performance is based on output, rather than hours spent working, our core hours are (10:00-16:00 GMT) Stock options after 12 months of employment (50% of Basic Salary) Team building abroad in exciting locations!
Unlimited time-off policy Two office locations, London and Lisbon, in case you'd like to work from the office sometime Wellbeing program, (up to 2 counselling session per month) Health Insurance, for our employees joining outside UK or PT you have a 1000€ yearly allowance.
If you feel that that's a match we would be excited to have you on our team!