Esteban Hirzfeld

Autonomous Senior Backend Engineer specialized in high throughput systems, scalable architecture. Strong foundation in Python (Django/FastAPI) and adaptable to polyglot environments including Java/Spring Boot.

Proven track record of taking full ownership of tasks from architecture to deployment without requiring micromanagement. Experienced in building robust APIs (REST, GraphQL), and leveraging AI assisted tools (Claude, Cursor) to maximize delivery speed.

PROFESSIONAL EXPERIENCE

NEORED 2024 – Present

Senior Backend Engineer

Designed and built autonomous backend pipelines and data transformation systems handling high volume daily operations with complete ownership of the deployment lifecycle.
Led the diagnosis and resolution of production issues collaborating directly with stakeholders to ensure system stability and high client satisfaction.
Developed reusable data extraction and transformation pipelines for large scale catalog enrichment handling hundreds of complex records daily before insertion into ERP systems.

Independent Contractor 2022 – 2024

Semi-Senior Backend Engineer

Architected a high performance event-driven platform handling over 8000 updates per hour, leveraging message queues and asynchronous workers (Celery & Redis) to manage real-time data flows and ensure high availability.
Achieved under 800ms response times under heavy load via server side optimization, Docker containerization, and automated cron pipelines.
Integrated complex APIs and managed data synchronization across multiple asynchronous services for various client projects.

Coder House (Contractor) 2021 – 2022

Senior Instructor & Courses Coordinator

Built Boom Recorder: an internal video feedback platform with screen capture, automatic cloud upload, and sharing capabilities developed from start to finish as a solo project.
Taught over 1500 students across 15 cohorts in backend and frontend technologies maintaining a top tier rating and high graduation rate.
Mentored instructors on technical best practices and curriculum delivery promoting through multiple roles up to Coordinator.
Recognized as a Top 10 Instructor company wide in 2022.

EDUCATION

DA VINCI 2024 – 2026

Computer Science

SKILLS

Backend: Python, Django, Java, Spring Boot, Node.js, PostgreSQL, SQL, MongoDB

Architecture & Data: Event-Driven Architecture, Message Queues (Celery/Redis), Software Architecture, GraphQL, Web Scraping, Docker, AWS

Tools & Practices: Git, CI/CD, Claude, Cursor, Windsurf, Agile

LANGUAGES: Spanish (Native), English (Fluent (Professional Working Proficiency, B2+))

AWARDS: Hackathon Make Sense Winner (2021), Coder House Top 10 Instructors (2022)