Senior Ruby on Rails Backend Engineer

Ersilia is seeking a senior backend engineer to own critical systems and contribute to the roadmap. You will implement code, review it, test rigorously, and ensure reliability, performance, and correctness across production environments.Work autonomously with high ownership, collaborating with engineering and product teams while balancing risk and business...

Is this you? Titan Operating System S.L. (Titan OS), the Barcelona-based technology, entertainment, and advertising company, is looking for you!At TitanOS, we live by three core values:Make things happen - We take ownership, move fast, and deliver impactNo ego - We collaborate with respect and humility to reach shared goalsShow genuine passion - We love what...

You will take ownership of a backend system that is critical to the company and our customers. You will have the opportunity to help define our roadmap and find the best technical solutions. You will also have time to run some experiments and bring new ideas to the table.Your responsibilities:Hands-on code implementation, code reviews, testingEnsure...

We are working with a product‑led company looking to hire a Senior Rails Developer to play a key role in scaling and evolving their backend systems. This is a hands‑on role with real ownership and impact across engineering and product. The Role As a Senior Ruby on Rails Developer, you’ll be instrumental in building and maintaining core systems that...

Recruiter4you is seeking a Senior Ruby on Rails Engineer to join a fast-growing AI technology company behind an AI companionship platform used by millions worldwide. You’ll work on scalable, AI-powered applications, developing new features and improving existing functionality alongside the CTO, Tech Lead and wider engineering team. This is a hands-on...

Location: Fully remote – Europe (CET ±3 hours)Salary: €75,000–€105,000/year, depending on location and experienceContract: B2B preferred, flexibleExperience: 5+ yearsImportant: Must be comfortable working with explicit NSFW content. About the Role We’re looking for an experienced Senior Ruby on Rails Engineer to join a fast-growing AI...

Senior Backend Developer (Ruby on Rails) Madrid, A Coruña, Salamanca, Barcelona, Ciudad Real | Hybrid Model | Full-time | Permanent Contract At Team System | Quipu, we help thousands of freelancers, SMEs, and accounting firms across Spain manage their businesses simply and efficiently through an intuitive and reliable Saa S platform. Since October 2025,...

Flight Centre Travel Group is seeking a Software Engineer in Barcelona to design, build, and evolve AI-native travel tech. You will work in agile squads, owning features from design through deployment while collaborating across international teams. The role emphasizes backend Rails development, containerised services, and integration of LLM APIs to deliver...

1 week ago Be among the first 25 applicantsGet AI-powered advice on this job and more exclusive features.We are looking for a senior Ruby on Rails engineer to become the technical backbone of our product. You'll own the hardest PRs, raise the bar for the entire codebase, and eventually take technical load off the CEO. This is not a management role. It's a...