Hi, I’m Daniel Sierra — a Back-End Developer who loves solving problems through clean, efficient code. My most recent project involved creating automation tools that saved my team hours every week, along with a messaging system that processed more than 1 million daily messages. I work primarily with Python, Django, and Docker, and I’m always eager to learn new technologies, collaborate with great teams, and keep pushing my skills to the next level.
Duration: May 2025 to August 2025
Role & Description:
As the sole Back-End Developer, I designed and implemented the logic for a books distribution management and expense tracking platform for Rumi Press using Django, Django Rest Framework, HTML, and Docker. The project aimed to streamline the management of book inventory and automate expense tracking for a small publishing operation. As a result, the system centralized book distribution records and simplified expense reporting, improving operational visibility and saving time on manual tasks. Through this project, I gained experience integrating data models, building user interfaces with Django templates, and deploying a production-ready app with Docker.
Key Skills:
Django
MySQL
Django Rest Framework
REST APIs
Docker
HTML
Pandas
Duration: July 2025 to July 2025
Role & Description:
As the sole Back-End Developer, I designed and implemented my personal portfolio website using Django, HTML, and Docker. The project showcases my professional experience and technical projects, and was deployed on Azure Virtual Machines for scalable and reliable hosting. By leveraging Azure VMs, I ensured secure access, automated deployment, and high availability for the site. This project allowed me to deepen my understanding of cloud infrastructure, CI/CD pipelines, and production-grade web hosting while building a responsive and visually engaging portfolio to present my work and skills.
Key Skills:
Django
PostgreSQL
Docker
HTML
Microsoft Azure
Nginx
Kanban
English
Duration: June 2025 to June 2025
Role & Description:
As the sole Back-End Developer for the authentication module, I designed and implemented a custom user model and integrated Django Allauth to enable Google social login for the Lushlyrics web project. I also added two-factor authentication using one-time passwords (OTP) to enhance account security. The goal was to provide a robust, flexible, and secure authentication flow for users. As a result, the platform now supports modern login methods and increased security, and I gained valuable experience working with Django’s user management, third-party authentication libraries, and advanced security features.
Key Skills:
Django
MySQL
REST APIs
HTML
Kanban
English
Duration: July 2024 to January 2025
Role & Description:
As the Lead Back-End Developer, I engineered a comprehensive Django-based platform that revolutionized RECUPERA SAS's debt recovery operations. This enterprise solution features a sophisticated role-based permissions system, 30+ interconnected data models, and automated reporting dashboards that reduced manual analysis time by 90%.
The system processes millions of financial records daily through custom ETL pipelines and integrates with payment gateways and communication APIs. I implemented advanced data processing algorithms for recovery probability scoring and designed a Celery-based task queue for resource-intensive operations.
The platform delivered measurable business impact: 40% reduction in operational costs and 25% increase in recovery rates through improved data-driven decision making. This project demonstrated my ability to translate complex requirements into scalable architecture while maintaining high performance under significant transaction volumes.
Key Skills:
Django
MySQL
Celery
Redis
HTML
Software Architecture
Kanban
Pandas
● Developed and maintained key features for a unified internal web platform using Django, streamlining
multiple daily operational tasks.
● Applied project management practice using Git for version control and Docker for containerization,
improving development and deployment efficiency.
● Handled large volumes of sensitive data, implementing authentication and authorization systems to
ensure secure access.
● Processed, stored ad exported large datasets using Python and SQL to support internal operations,
reporting and data centralization.
● Collaborated with external vendors to design, improve, and integrate RESTful APIs for better data
interoperability.
● Wrote Python scripts leveraging Pandas for advanced data manipulation and automation tasks.
• Engineered an enterprise-grade operational platform for RECUPERA SAS featuring role-based permissions,
30+ data models, and automated reporting dashboards, processing millions of financial records daily
• Implemented custom authentication systems with Google social login and two-factor OTP verification
for Lushlyrics, enhancing security and user experience
• Designed and deployed a personal portfolio website using Django and HTML/CSS, hosted on Azure VMs
with automated CI/CD pipelines for continuous deployment
• Developed a book distribution management system for Rumi Press with complete inventory tracking and
financial reporting capabilities using Django and Docker
• Technologies: Python, Django, HTML, CSS, JavaScript, Docker, PostgreSQL, Azure VMs, OAuth, Celery
Ultimate Docker — SHORT
March 2025 to March 2025 - see certificate
From images to manage multiple container aplications
Advanced Django: Mastering Django and Django Rest Framework — LONG
April 2025 to June 2025 - see certificate
From the architecting of large web development projects, to the Django REST framework, to task queuing
IBM Backend Development Professinal Ceretificate — LONG
August 2025 to Present
Learn server-side Python, Django, SQL, CI/CD, Docker, Kubernetes, microservices, serverless, security, and observability in a job-ready back-end development program.
Introduction to Software Engineering — SHORT
August 2025 to August 2025 - see certificate
Basics of the software engineering discipline, SDLC, programming constructs, architecture, etc.
Getting started with Git and Github — SHORT
September 2025 to September 2025 - see certificate
Version control, collaboration, branches, merging, pull requests, solving conflicts, workflows, etc.
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