The difference between software that works and software that lasts is the depth of its foundations. The Senior Full Stack Engineer (Python/JS) role in Barcelona is about building dependable systems that support growth and decision-making. This is a place for engineers who see the value in robust architecture and trusted data. You decide how technical choices shape the reliability and future of the platform. The person in this role sets the standard for what dependable software means.
ResponsibilitiesBuild and maintain production-grade systems from scratch, including backend services, APIs, data/ML platforms and automationDesign and develop APIs using REST, FastAPI, GraphQL and/or gRPCArchitect cloud-native, serverless, microservices and event-driven systems and ensure cloud integration (GCP and/or AWS)Implement DevOps practices, including CI/CD, Docker, Kubernetes, Terraform/IaC and automated deploymentsApply security-aware engineering, including IAM least privilege, secrets management, OIDC, Entra ID and permissions managementLead technical design and mentor engineers, communicating effectively with technical and business stakeholdersDevelop frontend/web applications for internal tools, dashboards and proof of conceptsWork with relational and NoSQL databases, such as PostgreSQL, Redis, BigQuery and DynamoDBEnsure observability and debugging using CloudWatch, Grafana, Datadog or similar toolsContribute to building AI/ML platforms,



agentic AI systems, agents, chatbots, RAG and LLM-basedRequirementsExpertise in software engineering fundamentals and building production-grade systemsProficiency in Python backend development, including APIs, services, data/ML platforms and automationExperience with API development (REST, FastAPI, GraphQL and/or gRPC) and architecture skills across cloud-native, serverless, microservices and event-driven systemsCloud experience (preferably GCP and/or AWS), including ECS, Lambda, SNS, SQS and managed data servicesSolid DevOps background: CI/CD, Docker, Kubernetes, Terraform/IaC and automated deploymentsSecurity-aware engineering: IAM least privilege, secrets management, OIDC, Entra ID and permissions managementExperience with AI-assisted programming tools and modern engineering workflowsAbility to lead technical design, mentor engineers and communicate effectively with technical and business stakeholdersFrontend/web app development experience, especially for internal tools, dashboards and proof of conceptsDatabase experience across relational and NoSQL systems (PostgreSQL, Redis, BigQuery, DynamoDB)Nice to have Experience with LangChain, LangGraph, LlamaIndex and prompt engineeringPlatform engineering or developer experience backgroundMLOps

experience:
model deployment, inferencing, monitoring and production operations

📌 Senior Full Stack Engineer (España)
🏢 Epam Systems
📍 España