About us

We’re a community of almost 300 Builders across the globe, with headquarters in London. Builder.ai helps anyone build, run and scale tailor-made software. We’re a startup that’s scaled up to an aggregate revenue of $100m+ in 5 years.

Builder Studio lets you build mobile apps, websites and wearables – no techie skills needed.

Builder Care is an aftercare warranty to make sure your software never goes out of date.

Builder Cloud offers big savings on your cloud spend (our customers saved over $4.5m, last year).

Our clients include hundreds of entrepreneurs and big global brands like Future Group, the BBC, Qatar Development Bank, Virgin Group and Siam Makro.

Life at Builder.ai

A positive and supportive culture encourages our people to do their best work every day. We celebrate individuals by recognizing their uniqueness and offer them flexibility to make daily choices that can help keep them centred. We’re continuously looking for new ways to maintain a culture that’s inclusive, invites authenticity, leverages our diversity and where our people excel and lead healthy, happy lives. Our culture is a cross between serious business and quirky startup – as we’ve grown from $0.5m to $45m in less than 4 years. We’re keen to add team players, who’ll roll up their sleeves and are open to being challenged.

About the role:

We are looking for a Ruby on Rails developer that brings their own ideas to the table. This person must have significant expertise in ROR, as well as be highly detail oriented and self-driven. Furthermore, they must be able to inspire and mentor others when the need arises.

  • Architecting and designing scalable backend systems
  • Integration and development of various microservices
  • Creating unit tests using RSpec
  • Reviewing other developers code as well as suggesting improvements
  • Algorithm development and general optimization
  • Setting up CI/CD pipelines
  • Collaborating with various stakeholders including QA, DevOps, PMs and other developers
  • At Least 2-3 years solid experience on Ruby on Rails, including at least one start to finish project where you were the lead developer or a primary contributor.
  • Solid understanding of deploying and maintaining Rails apps within the AWS environment.
  • Ability to set up workers and deploy across multiple instances.
  • Git experience, some would say you are a git master.
  • If I asked your previous co-workers about you, they would say you were a good team player

6 Months Deliverable:

  • Collaborate with designers, product managers, and other software developers to deliver compelling user-facing products
  • Lead teams of developers in architecting efficient and reusable systems that drive complex applications across the stack
  • Create instrumentation, monitoring, and alerting tools to ensure availability/scalability during peak traffic times and implement solutions to maximize uptime
  • Identify and resolve performance and scalability issues


  • A strong drive and sense of ownership of the challenges we take on, coupled with a team-oriented, can-do attitude
  • Working knowledge of standard CS fundamentals (data structures, algorithms, complexity analysis)
  • A professional proficiency in English
  • A systematic debugging and problem solving methodology
  • Minimum of four years of experience with Rails 4/5


  • Health and well
  • ness benefits
  • Performance-based bonuses and stock options
  • Employee friendly policies
  • Generous vacation and time off benefits, including paid holidays
  • Generally flexible working hours
  • Working in a young, energetic and infectious work atmosphere

Senior ROR Developer

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