> Markdown version of [/jobs/ext/1669931-senior-fullstack-software-engineer](https://www.wearedevelopers.com/jobs/ext/1669931-senior-fullstack-software-engineer). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Fullstack Software Engineer - **Company:** femtasy - **Location:** Berlin, Germany (Remote available) - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** JavaScript (Programming Language), Artificial Intelligence, Amazon Web Services, Code Review, Continuous Delivery, Continuous Integration, Data Warehousing, Github, Pair Programming, Ruby on Rails, Ruby, Next.js, TypeScript, Test-Driven Development (TDD), ReactJS, Grafana, Backend, Kubernetes, Sentry, Front End Software Development, React Redux, Terraform, Elixir - **Published:** July 31, 2026 - **Apply:** https://www.adzuna.de/details/5821515622 ## About the Role * You've spent at least 3-4 years at senior level, owning production systems through real growth - enough time to have seen things break in ways no tutorial covers. * Deep, production-level experience in at least two of the three: frontend, backend, infrastructure - and genuine curiosity for the third. If you've spent your career in a single discipline, this role won't be a fit. * You already work with AI tools day to day, - with AI agents, not just autocomplete - and can show concrete examples from recent work. This is a hard requirement, and our application form asks for one. * A user-centric mindset with an understanding of business metrics. * Fluent in English. * This role is 100% remote within the EU - our engineering team already works from Germany, Spain and Portugal, and our headquarters are in Berlin. Prefer the Berlin office, fully remote, or a mix? Whatever suits you best. You reside in the EU and hold a valid EU work permit (CET ±2h). Core collaboration hours are 10:00-17:00 CET; we're flexible beyond that. Here are some random buzzwords we use daily: Elixir, TypeScript, Redux, Jest, Ruby on Rails, JavaScript, Kubernetes, AWS, GitHub + GitHub Actions for CI/CD, Terraform, Sentry, Grafana... and some more... Data warehouse, AI-driven development, AI code reviewers, Human-in-the-Loop, workflow automation, code reviews, pair programming, TDD, BDD, CI/CD, continuous delivery, automation, tests, tests, and more tests... One thing we mean seriously: we are stack-agnostic. Elixir experience is NOT required - we hire engineering depth and expect you to get productive in our stack within weeks. ## Description * Implement new features across our whole stack, from backend to frontend. Elixir, Ruby, TypeScript + (React | Next.js), with high 90s % coverage on all projects. * Use AI as a core part of how you build. You'll lean on AI to move fast, and build and improve the workflows that automate our technical and business tasks, from generating reports to swapping assets to digging into bugs. * Maintain, design, and scale our platform. It runs on AWS, based on EKS and served via Netlify. * Own quality end to end. Every PR runs through our AI reviewers first, but you're the human in the loop who validates and signs off. Nothing merges without a dev. * Work closely with our Marketing and Product squads, and be crucial to deciding and implementing the features that support our business goals. * Report directly to the CTO, challenge the status quo, and help define the future of our platform, including how far we take AI. ## Related Videos - [Shipping Faster with Less: Render on Cloud Hosting, AI Workloads, and the Future of DevOps](https://www.wearedevelopers.com/videos/1894-shipping-faster-with-less-render-on-cloud-hosting-ai-workloads-and-the-future-of-devops) - [From Doubt to Confidence: How Sentry Uses Verdaccio to Bulletproof SDK Releases](https://www.wearedevelopers.com/videos/739-from-doubt-to-confidence-how-sentry-uses-verdaccio-to-bulletproof-sdk-releases) - [Bringing digital education to refugee and host communities in remote regions of Africa](https://www.wearedevelopers.com/videos/644-bringing-digital-education-to-refugee-and-host-communities-in-remote-regions-of-africa) - [Coffee with Developers: David Heinemeier Hansson](https://www.wearedevelopers.com/videos/875-coffee-with-developers-david-heinemeier-hansson) - [Why Your Best Mediors Never Become Seniors (And How to Fix It)](https://www.wearedevelopers.com/videos/2108-why-your-best-mediors-never-become-seniors-and-how-to-fix-it) - [Debugging in the Dark](https://www.wearedevelopers.com/videos/1658-debugging-in-the-dark) ## Related Articles - [Find a Developer Job: 12 Best Job Sites For Developers](https://www.wearedevelopers.com/magazine/165-find-a-developer-job-12-best-job-sites-for-developers) - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs) - [Dev Digest 121 - AI goes offline](https://www.wearedevelopers.com/magazine/456-dev-digest-121-ai-goes-offline) - [Dev Digest 120 - Apple and peers](https://www.wearedevelopers.com/magazine/455-dev-digest-120-apple-and-peers) - [Where To Find Software Engineering Jobs](https://www.wearedevelopers.com/magazine/396-where-to-find-software-engineering-jobs) - [Is Software Engineering Over-Saturated?](https://www.wearedevelopers.com/magazine/418-is-software-engineering-over-saturated)