David Antonio M.

I’m a Backend Engineer specialized in Python with over 4 years of experience building scalable, high-performance systems across multiple industries, including tourism, insurance, real estate, video streaming, marketing, messaging/notifications, beauty/salon tech, startups, and blockchain/crypto (Bittensor). As Founder and CTO of an award-winning tourism startup, I’ve led full-stack technical teams, defined software architecture from scratch, and launched robust platforms that have scaled to production with SEO, CI/CD, multichannel notifications, and integrated payments. My work has been recognized with national entrepreneurship awards and funding grants. I bring a strong background in Python and its most powerful backend frameworks (Django, FastAPI, Flask), and I’ve used them to solve real-world problems in fast-paced, high-impact environments. From building data pipelines and microservices to integrating third-party APIs and writing tests with over 93% coverage — I’m all about clean, maintainable, and scalable backend systems. Across Upwork and other international projects, I’ve completed long-term engagements (1,900+ hours, $10K+ earned) with clients from the U.S., Spain, Argentina, and Colombia, always delivering clean code, rock-solid architecture, and clear communication. What I Do Best 🚀 ✔ Python Backend Expert Deep experience in Python and core frameworks: Django, FastAPI, Flask, Django REST Framework Built complex RESTful APIs, webhook-based systems, and authentication flows (OAuth, JWT) Architected systems using Ports & Adapters, microservices, and MVC patterns Implemented asynchronous systems with Celery, BackgroundTasks, queues, and cronjobs ✔ Scalable Systems Across Diverse Industries Tourism: CTO of a full-featured tourism startup with booking, SEO, payments, notifications, and CMS Insurance: Integrated SOAP/REST services from insurance providers into a single Django backend (93%+ test coverage) Real Estate: Aggregated data from multiple listing providers, created synchronization and ETL pipelines Beauty & Salon: Built backend tools for dynamic service configuration, campaign rules, and client messaging Streaming Media: Developed a RESTful backend with media management and recommendation logic (35% engagement boost) Marketing & Notifications: Manage WhatsApp and Twilio, created campaign systems with advanced validation logic Crypto & Blockchain (Bittensor): Built shell-based automation tools, miner installers, and contributed to open source infrastructure Startups: Regularly involved in MVP design, scaling strategy, CI/CD pipelines, and team mentoring ✔ Infrastructure & DevOps for Real Projects Provisioned and maintained environments on AWS (EC2, RDS, S3) and GCP Used Docker, GitHub Actions, Terraform, and CI/CD pipelines for stable deployments Automated developer environments and onboarding with Bash/Shell scripts, reducing setup time by 75% ✔ Data-Driven Integrations & ETL Work Designed and deployed ETL flows with Airbyte, leveraging cloud storage (S3, GCP) and AI tools (LlamaIndex) Connected and normalized data from external APIs, NoSQL, and relational DBs Built dashboards, internal tools, and backend logic to make sense of data ✔ Engineering with Quality First Developed test suites with Pytest, enforced code style with Ruff, Black, and pre-commit Achieved 93%+ test coverage in several production systems Maintained detailed technical documentation, READMEs, and onboarding material ✔ Leadership & Communication As CTO, led a cross-functional team of devs and marketers, defined architecture, and maintained stakeholder communication Managed development cycles with Jira, collaborated with frontend teams, and used Confluence for project alignment Participated in open source (PRs merged) and mentored devs Tech Stack Overview Languages: Python, Bash, JavaScript, Go, Java Frameworks: Django, FastAPI, Flask, Django REST Framework, Celery Architecture: Microservices, Ports & Adapters, MVC, Factory, Strategy, Observer Integrations: REST APIs, SOAP, Webhooks, WhatsApp, Twilio, Shopify, Wompi, OAuth2, Auth0 DevOps/Cloud: AWS (S3, EC2, RDS), GCP, Docker, GitHub Actions, Terraform, CI/CD, R2 Databases: PostgreSQL, MySQL, MongoDB, Firebase ETL & AI: Airbyte, LlamaIndex QA & Testing: Pytest, Ruff, Black, Postman Project Tools: Jira, Confluence, GitHub, GitLab SEO/Marketing: Facebook Ads, dynamic/static SEO optimization, conversion strategies Achievements & Recognition Winner – Collision EBT (MacondoLab – Universidad Simón Bolívar) Winner – Nuestra Barranquilla (Fundación Corona) – Received ~$10K in pre-seed funding Reduced dev onboarding time by 75% through Bash scripting Boosted engagement by 35% through membership-based recommendation systems Delivered systems with >93% test coverage, high uptime, and strong documentation Worked across startups, SaaS platforms, and open-source ecosystems in 4+ countries