Juan David Mazuera

Python | Backend Developer

Backend engineer with experience in Python (Django, Flask), RESTful APIs, and high-volume SQL optimization. Skilled in cloud integrations (AWS, Azure), data reporting, and enhancing legacy systems. Strong collaborator, translating business needs into scalable technical solutions and supporting reliable deployments through CI/CD.

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Work Experience

LF Technologies

Software Engineer

Dec 2020 — Sept 2025

Designed and maintained Flask-based RESTful APIs in Python 2.7, providing ongoing support and ensuring reliable backend functionality.
Executed deployments of new features via Jenkins, leveraging continuous integration and continuous delivery (CI/CD) pipelines to ensure reliable and automated releases.
Collaborated with the tech lead on sprint planning, clarified technical blockers, and contributed to architectural and technical design discussions.
Developed new components and performed frontend refactoring in React 15 to support new features.
Developed and expanded automated tests for both new features and legacy code, ensuring high code quality and significantly increasing test coverage.
Designed and delivered data reports using Pandas, Looker, SQL, and SQLAlchemy, supporting client needs within a SaaS-based platform.
Enhanced and updated existing system integrations to reliably capture and process financial data from Plaid.

UseIT S.A.S.

Backend Developer

Mar 2020 — Dec 2020

Developed business logic and designed robust database models with Django, ensuring scalability and reliability across core system functionality.
Implemented and configured new software solutions on cloud platforms (AWS), integrating them as secondary services to enhance and extend the functionality of the primary application.
Analyzed and optimized SQL queries for high-volume datasets in PostgreSQL, significantly improving database performance and scalability.
Implemented OAuth2-based authentication with Microsoft Azure (Azure AD) to securely integrate the system with cloud identity services.

Opal Group S.A.S.

Backend Developer and SQL Developer

Jun 2016 — Mar 2020

Designed and built client-specific reporting solutions using Django, JavaScript, AngularJS, and SQL Server, ensuring accurate data delivery and seamless integration with existing systems.
Consolidated and processed data from heterogeneous database systems to deliver comprehensive financial reporting and analysis.
Optimized and fine-tuned SQL queries for high-volume workloads across PostgreSQL, SQL Server, MySQL, and Oracle, significantly improving performance and resource utilization.
Supported and maintained cloud-based application solutions for diverse clients, ensuring stability and reliability in production environments.
Collaborated directly with clients to understand their business needs, documenting and translating them into detailed technical requirements for implementation.
Worked closely with Product Managers and Product Owners to evaluate technical feasibility, shaping what could be built and defining the scope of viable solution offerings.

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About Me

I’m a backend engineer with experience building scalable and reliable systems using Python (Django, Flask), RESTful APIs, and high-volume SQL databases. I’ve worked across SaaS, enterprise, logistics, and fintech environments, enhancing legacy platforms, integrating third-party services, and delivering cloud solutions on AWS and Azure. I also build data reporting tools, support CI/CD deployments, and collaborate with product teams and clients to translate business needs into technical solutions that drive real value.