Back End Developer

📍 Location: Barcelona (Sant Cugat del Vallès)🔍 Seniority: Senior🛠️ Position: Senior Backend EngineerAbout the jobWe are hiring for an AI-first SaaS platform that leverages a network of autonomous intelligent agents to fully automate digital marketing operations for freelancers and small and medium-sized businesses. These AI-driven agents build and optimize websites and landing pages, manage advertising campaigns, publish content across social media channels, maintain Google Maps business profiles, and handle customer reviews.As the platform continues to scale, the engineering team is being expanded to build robust, scalable, and highly available backend systems that form the backbone of a sophisticated AI-powered automation infrastructure.👷 About the RoleWe are looking for a Senior Backend Engineer (Python/Django) to design, build, and evolve the backend services that power the platform. You will work on distributed systems, external integrations, and scalable architectures that support thousands of automated operations. This role plays a key part in defining engineering standards, raising technical quality across the team, and ensuring sustainable, secure growth of the product.As a Senior Backend Engineer, you will:✔ Design and implement highly available and scalable backend services using Python and Django ✔ Build and evolve a distributed platform capable of handling complex, high-volume operations ✔ Ensure architectures follow clean code, SOLID principles, modularity, and maintainability ✔ Integrate third-party APIs, external services, and internal systems with a strong focus on security and reliability ✔ Strengthen observability through logging, metrics, monitoring, and alerting ✔ Participate in peer code reviews, technical design sessions, and architectural decisions ✔ Mentor junior engineers and help raise the overall engineering bar ✔ Promote best practices in testing, documentation, security, CI/CD, and engineering culture ✔ Collaborate within an Agile environment to deliver scalable, high-impact solutions💡 Required Skills & Tech StackWe value strong technical judgment, ownership, and a collaborative mindset. Experience with the following is required:🔹 6–7 years of experience building scalable, highly available applications 🔹 Strong expertise in Python, Django, and REST API design 🔹 Solid knowledge of SQL and NoSQL databases (PostgreSQL highly valued) 🔹 Experience with cloud platforms (AWS, GCP) 🔹 Hands-on experience with Docker and Kubernetes 🔹 Strong problem-solving skills and analytical mindset 🔹 Excellent communication, collaboration, and technical leadership skillsNice to have:Advanced observability practicesEvent-driven architectures or complex distributed systemsExperience leading technical initiatives or architectural improvements🌟 What We Offer✔ High-impact role with real autonomy and influence on key technical decisions✔ Competitive salary aligned with seniority, plus team-based performance bonus✔ Stable full-time contract✔ Continuous professional development, training, and mentoring✔ Startup culture focused on ownership, results, and frequent feedback✔ Hybrid model in Sant Cugat✔ 23 working days of vacation + birthday off✔ Intensive working hours every Friday✔ Flexible August schedule✔ Team-building activities, celebrations, and off-sites✔ Referral program✔ Flexible compensation via Coverflex✔ Employee discount portal✔ Significant discount on private health insurance✔ Office perks: meal tickets, snacks, fruit, and additional benefits💬 Ready to take on a challenge?If you’re ready to take on an exciting challenge and grow with a disruptive AI-driven SaaS platform, we want to hear from you