Angello G.

Senior Backend Engineer with 5+ years building production systems at scale (Python, FastAPI, Django). I take ownership of complex backend problems end-to-end—from architecture and third-party integrations to security hardening and production optimization. Most recently led backend systems at a US AI startup, designing payment infrastructure and reducing memory utilization 30% without adding infrastructure cost. What I can build and own: - Backend systems & APIs: Python, FastAPI, Django, Flask, REST APIs, microservices - Complex integrations: payments, subscriptions, external APIs, and third-party services - AI-powered applications: OpenAI and Anthropic integrations, LLM-enabled workflows, document processing - ETL & data pipelines: extraction, transformation, validation, processing, and automation - Asynchronous systems: Celery, background jobs, task processing, and workflow automation - Security & reliability: security hardening, validation, error handling, logging, and production safeguards - Cloud & deployment: Docker, CI/CD, AWS, and Google Cloud - Data-heavy applications: SQL, MongoDB, Pandas, NumPy, and large-scale data processing Selected impact: - Designed and implemented complete payment and subscription infrastructure using Stripe and RevenueCat. - Led a comprehensive security-hardening effort across a production application. - Built document-processing and ETL workflows handling thousands of complex documents and millions of data points for downstream AI/ML workflows. - Developed Python-based financial data-processing solutions for large datasets. - Optimized production FastAPI/Celery services, reducing memory utilization from approximately 80% to 50-60% without increasing infrastructure costs. - Led and coordinated a 4-person engineering/QA team while continuing to contribute hands-on to architecture and development. How I work: I take ownership from architecture through production: understanding the problem, evaluating technical trade-offs, designing the system, implementing it, testing it, deploying it, and supporting it in production. I care about more than making software work. I focus on security, reliability, maintainability, performance, observability, and sensible infrastructure costs. If you need a senior Python engineer who can take ownership of a complex backend problem and turn it into a production-ready system, I’d be happy to discuss your project. Languages & Frameworks: Python, Django, FastAPI, Flask API & Integration: REST API Development, API Gateway, Microservices Architecture, Third-Party Integrations (Stripe, RevenueCat) Cloud & Infrastructure: AWS (Certified Developer track if applicable), Google Cloud Platform, Docker, Container Orchestration, CI/CD (Bitbucket or similar) Databases & Data Processing: SQL, MongoDB, Cassandra, Pandas, NumPy, Big Data, ETL Pipelines Async & Distributed Systems: Celery, Async Programming, Background Task Processing, Workflow Automation AI/ML Integration: OpenAI API, Anthropic API, LLM-Enabled Workflows, Document Processing Architecture & Practices: Architecture Design, Agile, BDD, Security Hardening, High Availability, Error Rate Optimization, Cloud-Native Design