AI Backend Engineer

AI Backend Engineer Job Description About Us We are a tech company with a business-driven DNA, founded in Barcelona, with the vision of becoming a global leader in the creation of digital hubs for major corporations worldwide. We dont just build digital products we help shape the digital business strategy behind them. Our teams operate at the intersection of technology and business, acting as high-level strategic partners for the companies we work with. Were trusted not only to deliver, but to lead driving innovation, challenging assumptions, and defining the future of digital for global organizations. We work with agile methodologies, embracing continuous iteration as our mantra. Our multidisciplinary teams manage the entire end-to-end lifecycle of our digital products, and we are dynamic and business oriented. Job Summary We are looking for a Backend AI Engineer to design, develop and operate the backend microservices that enable loyalty, health, and personalization features across our pharmacy retail B2C apps. You'll build the systems that connect our data, business logic, and AI-powered capabilities into seamless, reliable customer experiences leveraging AI coding agents to accelerate delivery and ensure scalability. This role is about bringing AI into production through solid engineering developing APIs, microservices,  and automation pipelines that power intelligent consumer features while maintaining robustness, compliance, and quality. Youll collaborate with product and AI teams but focus on backend architecture, orchestration, and performance ensuring every feature built with AI translates into a consistent, secure, and high-impact user experience. Ultimately, your goal will be to enable models that, through continuous tuning and feedback, become increasingly accurate and aligned with real user needs. Responsibilities Guide and supervise model behavior through feedback loops, structured evaluation, and correction mechanisms. Build and maintain pipelines for fine-tuning and retraining (SFT, LoRA, DPO), integrating user or system feedback safely. Develop evaluation tools and safety layers (guardrails, moderation, scoring) to ensure accuracy, reliability, and compliance. Integrate model lifecycle management into CI/CD workflows versioning, deployment, rollback, and monitoring. Collaborate with data and platform engineers to ensure efficient model serving, scaling, and observability in Kubernetes environments. Translate technical insights from model behavior into systemic backend improvements. Requirements 5+ years of experience in backend engineering (.NET Core / C#, Go, or Java) Proven experience building and operating cloud-native microservices (Kubernetes, Docker, Terraform, ArgoCD). Strong understanding of API design, service contracts, and observability (OpenTelemetry, Prometheus). Experience integrating or operating LLM-based APIs (OpenAI, Azure OpenAI, Anthropic, etc.) in production. Solid grasp of CI/CD pipelines, automated testing, and deployment practices. Familiarity with data flows and storage (SQL/NoSQL, queues, message buses). Clear communicator able to reason about model behavior and system design with both technical and product stakeholders Nice to Have Experience with model evaluation or dataset management. Knowledge of AI-assisted coding tools (Copilot, Cody, ChatGPT). Experience applying AI in code quality, refactoring, or testing automation contexts. Our Mission Our mission is to digitalize some of the biggest corporations in the world and now, to transform how software itself is built through AI. Our Values We work like a family: Yeah, were coworkers but it feels more like a family of brothers and sisters. Weve got each others backs through challenges, and we dont miss a chance to celebrate the wins (big or small). We are backed by the biggest companies in the world, but we operate like a startup. We can always count on our colleagues to help us and to challenge us, just like your brother would do. We show our passion: Passion isnt just a buzzword for us its the fuel that drives everything we do. It means bringing energy to the team, bringing ideas to the table with fire in your belly (and a smile on your face). We laugh a lot, care even more, and genuinely love what we build. Passion is our heartbeat and it shows in our product. We live to innovate: Were not just building tech were change agents. Transformation is in our DNA, and questioning the status quo is what gets us out of bed in the morning. We believe bold ideas move us forward, and for us theres no such thing as a bad idea. Everyones voice matters, and weve created a safe space to dream big, speak up, and shape whats next. We think BIG. We always deliver: We make it happen and good is just the starting point we push to make it better tomorrow, and we don't stop until its genuinely awesome. Were a high-performing team that holds itself to higher standards, always going the extra mile to deliver impact, not just output, and were like the postman rain or shine, we always deliver. We say what we think: We communicate openly with clarity, honesty, and respect. We trust each others intentions and believe that transparency builds stronger, faster teams. Speaking up isnt just welcome, its expected. We don't take things personally we take them forward. Perks of joining our team Great team Competitive Salary Restaurant Ticket for 170/month Private Health insurance Hybrid remote-office workplace Flexible schedule Possible intensive timetable in the summer months 24 Holiday days per year 1.000 Referral reward Filtered water, biscuits, fresh fruit, wide selection of teas and Nespresso Work in one of the top digital hubs in the city center of Barcelona