Senior Ruby Developer

Location: Fully remote (EMEA)

Employment Type: Permanent or B2B Contract

Base (p/a): €100k + benefits (listed below)

Start Date: Immediate/negotiable

Full-time | Remote (Europe-based)

Are you a seasoned backend engineer with deep Ruby-on-Rails expertise? Were looking for a Senior Ruby-on-Rails Engineer to join a fast-growing, ambitious AI-centric tech team building world-class products used by millions globally. This is a hands-on engineering role with plenty of technical ownership, collaboration across product and engineering functions, and an opportunity to shape the backend architecture of core products.

What You'll Be Doing

Collaborate with product and engineering peers to refine project specs, break down tasks, and deliver high-quality technical solutions.

Build, test, deploy, and maintain core backend systems using Ruby-on-Rails.

Write clean, efficient, and scalable code that supports a high-traffic product.

Participate in code reviews, mentoring, and knowledge sharing within the engineering team.

Contribute ideas and technical leadership on backend architecture and best practices.

What Were Looking For

5+ years of experience as a backend or full-stack engineer, with recent Ruby-on-Rails experience .

Proven ability working in fast-paced, agile environments and delivering production-grade backend solutions.

Strong understanding of backend engineering principles and web application architecture.

Excellent communicator with strong English fluency.

Ownership mindset — you care about the code you ship and the impact it has.

Bonus points

Interest or experience in AI, data science, or distributed teams.

What We OfferContract FlexibilityPrefer B2B, but open to other arrangements — what matters most is long-term ownership and real impact.

Work From AnywhereFully remote. Build world-class AI from wherever you do your best thinking.

Generous Time Off4 weeks (20 working days) of paid time off per year — step back, reset, and come back sharp.

Annual Team GatheringOnce a year, we meet in person to align on vision, brainstorm big ideas, and celebrate what weve shipped.

Health & Wellbeing SupportUp to $200/year for wellbeing expenses plus unlimited 1:1 sessions with psychologists and lifestyle experts (also available for up to three family members).

Co-Working BudgetPrefer not to work from home every day? Use a co-working space up to twice per month (35 EUR / 40 USD per visit).

Learning & Experimentation BudgetFunds for courses, books, conferences, research, or anything that keeps you sharp in the fast-moving LLM space.

Equipment & SetupCompany laptop provided, plus up to $250 for monitors or home-office upgrades.

Premium AI ToolingFull access to top-tier AI tools (LLM APIs, coding assistants, model hubs) so you can move fast and build better.

How to ApplyIf youre excited to build backend systems with Ruby-on-Rails for high-impact products and thrive in a remote, autonomous environment, we want to hear from you.

SourceIn (sourcein.co) has been formally appointed by the client to provide recruitment and candidate pre-screening services for this role.