Our client is one of the fastest-growing AI companies globally, redefining digital relationships for over 40 million users. Their AI companion platform, powered by proprietary moderation technology, is built within a high-velocity, AI-first environment. If you thrive in scale-ups and care deeply about product quality, this is a unique opportunity to make a real impact.
To support their next stage of scale, they are hiring a Senior Software Engineer to lead architecture, performance, and backend engineering strategy across a high-traffic product environment.
Your Responsibilities
- Own and define the backend architecture strategy for a product serving millions of users
- Lead scalability, reliability, and performance optimization in high-concurrency environments
- Act as technical authority for Ruby / Ruby on Rails across the organization
- Collaborate closely with Product and Executive leadership to shape the technical roadmap
- Drive engineering best practices: code reviews, testing standards, documentation, and system design
- Mentor and elevate backend engineers, fostering a culture of ownership, velocity, and technical excellence
Your Profile
- 6+ years of experience in backend or full-stack engineering, with senior-level scope
- Solid experience in Ruby/Ruby on Rails as your primary stack or a willingness to become an expert
- Proven experience building and scaling high-traffic, large-scale distributed systems
- Background in fast-paced tech scale-ups or performance-driven product companies
- Strategic mindset combined with hands-on technical depth
- Fully fluent in English and comfortable operating in globally distributed remote teams
Your Benefits
- Competitive compensation package.
- Fully remote setup, work from anywhere in Europe
- Contract type: B2B preferred, flexible for long-term commitment
- Exposure to cutting-edge generative AI technologies and experimentation
- 20 days paid time off + additional flexibility
- Learning & development budget for courses, books, conferences, certifications
- Annual in-person company gathering
- Health & wellbeing support including sessions with psychologists and lifestyle experts