Staff Backend Engineer (GraphQL / AWS / Python)

Staff Backend Engineer (GraphQL / AWS / Python) We are: Lumen Dynamics is a global AI-native technology solutions provider that develops cutting-edge, AI-powered digital products and platforms. We partner with clients to leverage data and AI, accelerating market entry and driving business transformation. As a global community of innovators, we foster a culture of growth, collaboration, and impact. With the right people and the right ideas, there’s no limit to what we can achieve. Are you a fit? Sounds awesome, right? Now, let’s make sure you’re a good fit for the role. We are looking for a Staff Backend Engineer to lead the design and development of scalable, high-performance applications across the backend. You will play a key role in defining system architecture, mentoring engineers, and driving best practices, while collaborating closely with cross-functional teams to deliver impactful digital products. This is a hybrid position based in Medellín or Bogotá , offering a balance between onsite collaboration and remote flexibility. AWS Architecture (Mandatory): Act as the core AWS Architect— must hold an active AWS Solutions Architect Certification or equivalent expert-level verified experience. Design and optimize secure serverless infrastructure using API Gateway, Lambdas, Step Functions, and strict IAM Policies. Backend & APIs: Build high-performance microservices using Python (FastAPI) and GraphQL under an Event-Based Architecture . Integrations & Security: Implement secure web flows and advanced OAuth architectures, focusing on On-Behalf-Of (OBO) user permission flows with external services. Observability: Maintain system health and logs using AWS CloudWatch and CloudTrail. Technical Requirements Expert knowledge of AWS (Lambda, Step Functions, API Gateway, IAM, CloudWatch/Trail). Strong production experience with Python and modern web frameworks (FastAPI preferred). Deep understanding of GraphQL , Microservices, and Event-Driven design. Proven experience handling advanced web security and OAuth / On-Behalf-Of flows. Nice-to-have AI Tooling Proficiency: Leverage one or more AI tools to optimize and augment day-to-day work, including drafting, analysis, research, or process automation. Provide recommendations on effective AI use and identify opportunities to streamline workflows. Hands-on experience integrating AI workflows, LLMs , and RAG pipelines. What we offer: A High-Impact Environment Commitment to Professional Development Flexible and Collaborative Culture Global Opportunities A Vibrant Community Total Rewards *Specific benefits are determined by the employment type and location. Find out more about our culture here . Apply for this position