Full Stack Developer

Role: Senior Full Stack Engineer (5–7 yrs experience), Barcelona La siguiente información tiene como objetivo proporcionar a los posibles candidatos una mejor comprensión de los requisitos para este puesto. Salary: €60- €80,000 per year plus stock and benefits Hybrid - 3 days in the office Whilst we prefer candidates who are already based in Barcelona and are local, we will also consider EU citizens who are able to move to Barca. Some limited settling in assistance can be provided by the business. Our client is not able to offer Visas or sponsorship to Non-EU passport holders unfortunately. About Us Our client is a fast-growing scale-up in the Customer Sentiment analysis and insights platform that allows brands to decipher granular customer feedback and feelings towards brands and products and action those learnings with the view towards driving growth. My client has built a powerful platform used by many global B2C and B2C SaaS subscription businesses to get to the heart of user needs and so they can build better products in-line with user wishes. Our client has a lean but mighty but world-class engineering and R&D team with high ownership, experimentation, and continuous learning. As we scale, we are seeking a strong Full Stack Engineer where there is future runway for personal growth and assuming more responsibility by becoming a team lead. Role Summary: You will be a core member of the engineering team, contributing hands-on across the full stack (frontend, backend, APIs, databases, DevOps). We’re looking for a self-starter who has drive and initiative who can build features customers love but also collaborate with the squad based structure working with Product Designers and R&D people to drive better innovations that move the needle for the business. Key Responsibilities: Design, implement, test, and maintain features end-to-end, from UI / frontend to backend services and data layers Collaborate with Product, Design, QA, and other stakeholders to define requirements, ensure high quality, and deliver iteratively Write clean, modular, and well-tested code; perform code reviews and set standards / best practices Contribute to architectural decisions (scalability, performance, reliability, security) Monitor, debug, and optimize production systems; participate in incident response Mentor and coach junior / mid-level engineers; gradually take on technical leadership responsibilities Help set engineering processes (CI/CD, code reviews, documentation, testing, deployments) Aid in hiring, evaluating tools and libraries, tech stack evolution Must-Have Qualifications 5 to 7+ years of hands-on software engineering experience Strong experience building full-stack web applications (frontend + backend) Deep knowledge of frontend frameworks / libraries (e.g. React, Vue, Angular, Svelte) AWS Serverless (Lambda, API Gateway), CloudFront, CloudFormation, RDS experience is mandatory Proficiency in one or more modern backend languages / frameworks (e.g. Node.js / Express, Python / Django / Flask / FastAPI, Java / Spring, Go, Ruby on Rails, etc.) Experience working with relational and NoSQL databases, APIs (REST, GraphQL) Familiarity with cloud infrastructure (AWS, GCP, Azure) xsgfvud and containerization (Docker, Kubernetes, etc.) Solid understanding of web fundamentals: security, performance, caching, concurrency Experience writing tests (unit, integration), CI/CD pipelines, automated deployments Good communication skills, ability to work in a multilingual / remote-friendly environment Fluent English; Spanish / Catalan is a plus (but not mandatory) Preferred / Differentiator Skills Experience in microservices architectures, event-driven systems, message queues Experience with DevOps / SRE practices (monitoring, logging, observability) Previous experience mentoring or leading engineers, or being tech lead Experience scaling systems to handle growth in users / traffic Familiarity with domain-specific tooling or domain (e.g. data pipelines, real-time systems, etc.) What We Offer Competitive salary + equity / stock options The aim is to be five days in the office but there is flexibility when required to WFH for life needs