Senior Full Stack Engineer (Python/JS)

EPAM Systems Inc; Barcelona; On-site; EUR 70,000 - 110,000; Full time

Benefits offered by this job

Private health insurance

Employee stock purchase plan

Paid sick leave

Referral program

Professional certifications

Language courses

Job summary

EPAM Systems Inc. in Barcelona is seeking a Senior Full Stack Engineer (Python/JS) to build dependable systems that support growth and decision-making. You will design APIs, architect cloud-native microservices, and lead DevOps practices across AWS/GCP environments.

You will mentor engineers, develop frontend and backend components for internal tools and dashboards, and work with relational and NoSQL databases, ensuring observability and secure, scalable deployments.

Qualifications

• Expertise in software engineering fundamentals and building production-grade systems.
• Proficiency in Python backend development and APIs.
• Experience with cloud-native, serverless, microservices and event-driven systems.
• Solid DevOps background with CI/CD and container orchestration.

Responsibilities

• Build and maintain production-grade systems from scratch, including backend services, APIs, data/ML platforms and automation.
• Design and develop APIs using REST, FastAPI, GraphQL and/or gRPC.
• Architect 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 deployments.
• Lead technical design and mentor engineers, communicating effectively with technical and business stakeholders.
• Develop frontend/web applications for internal tools, dashboards and proof of concepts.
• Work with relational and NoSQL databases, such as PostgreSQL, Redis, BigQuery and DynamoDB.
• Ensure observability and debugging using CloudWatch, Grafana, Datadog or similar tools.
• Contribute to building AI/ML platforms, agentic AI systems, agents, chatbots, RAG and LLM-based.

Skills

Python backend development

API development

Cloud experience

DevOps

Security-aware engineering

Leadership

Frontend/web apps

Tools

Docker

Kubernetes

Terraform/IaC

Job description

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 haveExperience with LangChain, LangGraph, LlamaIndex and prompt engineeringPlatform engineering or developer experience backgroundMLOps experience: model deployment, inferencing, monitoring and production operationsWe offerPrivate health insuranceEPAM Employees Stock Purchase Plan100% paid sick leaveReferral ProgramProfessional certificationLanguage coursesEPAM is a leading digital transformation services and product engineering company with 61,700+ EPAMers in 55+ countries and regions. Since 1993, our multidisciplinary teams have been helping make the future real for our clients and communities around the world. In 2018, we opened an office in Spain that quickly grew to over 1,450 EPAMers distributed between the offices in Málaga, Madrid and Cáceres as well as remotely across the country. Here you will collaborate with multinational teams, contribute to numerous innovative projects, and have an opportunity to learn and grow continuously.Why Join EPAMWORK AND LIFE BALANCE. Enjoy more of your personal time with flexible work options, 24 working days of annual leave and paid time off for numerous public holidays.CONTINUOUS LEARNING CULTURE. Craft your personal Career Development Plan to align with your learning objectives. Take advantage of internal training, mentorship, sponsored certifications and LinkedIn courses.CLEAR AND DIFFERENT CAREER PATHS. Grow in engineering or managerial direction to become a People Manager, in-depth technical specialist, Solution Architect, or Project/Delivery Manager.STRONG PROFESSIONAL COMMUNITY. Join a global EPAM community of highly skilled experts and connect with them to solve challenges, exchange ideas, share expertise and make friends.