Senior Fullstack Engineer

Join one of Southern Europe's fastest-growing startups Enginy is a Barcelona-based startup and one of Southern Europe's fastest-growing companies ranked #3 in the Sifted 100: Southern Europe 2026, and we're just getting started. We're building the AI-native GTM platform for modern B2B teams, combining prospecting, enrichment, intent signals, AI research and outreach into one product so sales teams can focus on what truly matters: selling. No wasted time, just results. After raising a €5M seed round, we're scaling internationally and growing the team behind the product. That means more users, more data, more integrations and harder engineering problems exactly the stage where strong engineers have an outsized impact. As a Fullstack Engineer, you'll have real ownership from day one across the whole product: high-throughput backend workflows, integrations, AI-powered features and polished web experiences. You'll own meaningful problems end to end and help shape both the product and the engineering standards of a company entering its next stage of growth. If you enjoy shipping fast, making product and technical decisions, and seeing your work directly impact customers, you'll have plenty of room to make a difference here. About the role We're looking for an engineer who is comfortable anywhere in the stack from a Temporal workflow to a React component and who wants to own features from the first conversation with Product to production. You'll join early enough to shape the systems, standards and product, at a stage where scale and customer demand already create real engineering challenges. Problem → API → UI → ship → iterate What you'll own - End-to-end features: ship complete functionality across backend and frontend, with a clear focus on quality, reliability and speed - Backend services: build scalable services, async workflows and data pipelines (Temporal), plus production-grade APIs and integrations with CRMs, LinkedIn and more - Web product: develop responsive React + TypeScript applications: dashboards, campaign builders and reporting UIs - Performance & observability: optimize performance on both sides of the stack, debug complex issues and keep the system observable - Product partnership: collaborate closely with Product and Design to scope work and make the right trade-offs - Engineering standards: help shape engineering practices, code quality and architecture as we scale About you - 5+ years of professional software engineering experience, with real work on both backend and frontend - Strong experience with TypeScript, Node.js and React - Solid understanding of modern API design, async workflows and web architectures - Experience with relational databases (PostgreSQL or similar) - Ability to work autonomously, debug complex issues and ship high-quality code - Strong communication skills and an advanced level of English - Bias for action and ownership you thrive in a fast-moving startup Nice to have - Familiarity with workflow engines (e.g. Temporal), distributed systems or microservices - Experience with Redis, Elasticsearch, Kafka or third-party API integrations - Knowledge of UI performance optimization or design systems - CI/CD practice with GitHub Actions - Experience in early-stage or fast-scaling startups - Interest in B2B SaaS, sales tech or automation tools Hiring process We've designed our hiring process to be close to real engineering work. No trivia-heavy interviews and no artificial take-home exercises we focus on how you think through product problems, technical trade-offs, ambiguity, quality, and the use of AI as part of modern engineering. One of our tech leads wrote about the philosophy behind it here: https://oriolcastro.me/posts/hiring-for-modern-engineering/ What to expect: - Intro conversation: your background, your goals, and the environment where you do your best work. - Short practical task: based on a small version of our product. We care about prioritization, scope, reasoning and delivery within constraints. Use AI tools, just like you would on the job. - Technical/product conversation: realistic engineering problems, not stack trivia. - Final conversation: team fit, expectations and next steps. What we offer 💰 Competitive salary tailored to your experience. 🎯 Enticing performance bonuses that you won't see anywhere else. 💳 Flexible remuneration through Cobee. 🏦 Pension Plan through Arca. 📅 Short Fridays all year round and extra days of vacation for your birthday and Geneversary. 🏋🏻‍♂️ A discount on a premium gym (with spa access) just a step away. 🍏 Free fresh fruit every day to help you care for your health. 🏖️ Aticco office so you can work with stunning views an inspiring and energizing workspace. 📚 Continuous learning, including but not limited to mentoring, coaching, workshops, and opportunities to attend SaaS conferences. 🚀 Career growth opportunities, as we won't let your dedication and results go unnoticed. 🎉 Team gatherings and celebrations, because we love to build connections and celebrate achievements together. 👨‍💻 A collaborative culture because we foster hard work, teamwork, transparency, and respect, encouraging open communication and a positive environment where your voice matters. ✨ If you're not sure you meet 100% of the requirements we still want to hear from you. Research shows that candidates from underrepresented groups often self-select out even when they're a strong match. If this role excites you and you believe you can make an impact at Enginy AI, we encourage you to apply. Ready to build the future of B2B sales, end to end? Apply now. Ready to shape the future of B2B sales with us? Let’s build something great together!