Descripción

Senior Full-Stack Engineer and Tech Lead with over 15 years of experience architecting high-throughput backend systems, building cross-platform mobile apps, and deploying cloud-native solutions.

As the solo founder and developer of a live, AI-powered mobile app, I bring an entrepreneurial, product-focused mindset to freelance projects, ensuring clean code, rigorous testing (mutation/E2E), and smooth third-party integrations (including LLMs/Claude API).

How I can help your business:

Backend & Architecture: Java, Spring Boot, Apache Kafka, Microservices, and Event-Driven Design.

Frontend & Mobile: React, React Native, TypeScript, and high-performance UI components.

Cloud & DevOps: AWS, Azure, CI/CD pipelines, and cost-optimization.

AI/LLM Integration: Adding intelligent features and agentic pipelines to existing software.

Idiomas

Inglés
Competencia profesional completa
Catalán
Competencia profesional básica
Español
Bilingüe o nativo

Preferencias de lugar de trabajo

Solo teletrabajo

Lleva a cabo sus proyectos principalmente en remoto

ArchivoPolitico.com
FullStack developer
CAPITAL PRIVADO
febrero de 2026 - mayo de 2026 (3 meses)
Barcelona, España
Built end-to-end a public web platform that archives, indexes and analyzes the Twitter/X activity of 50+ Argentine political figures (~200K tweets dating back to 2010)
Data pipeline: Python + Selenium scrapers with incremental updates, deduplication and resume-on-failure; a daily bash pipeline rebuilds the entire site (data, stats, pages, sitemap) unattended.
AI editorial layer: automated daily and weekly news-style summaries generated with the Claude API (multi-stage LLM pipeline with per-model cost optimization), injected into the site as publish-ready editorial content.
Interaction graph: interactive network map (vis-network) showing who replies to / quotes whom, with drill-down to the actual crossed tweets between any two politicians.
Zero-backend frontend: vanilla JavaScript SPA + statically generated pages; client-side full-text search over a custom lightweight index (~5 MB serving a 300+ MB archive); responsive, dark/light theming.
SEO & growth: per-politician static pages, structured data (JSON-LD), sitemaps, Google Analytics/AdSense integration.

Technologies: Python, Selenium, JavaScript, HTML/CSS, Tailwind CSS, vis-network, Chart.js, Claude API / LLM prompt pipelines, Bash, Git, GitHub Pages.
Selenium LLM Python Claude API TailwindCSS
Leading global health and IoT diagnostics platform
Senior Software Engineer
SECTOR MÉDICO
diciembre de 2023 - Hoy (2 años y 7 meses)
Barcelona, España
Key contributor to a cloud-connected IoT health diagnostics platform, developing full-stack features, data ingestion pipelines, and device interoperability solutions.
IoT Database Migration: Executed the seamless migration of local databases across 6,000+ IoT devices with zero data loss. Performance
Optimization: Enhanced connectivity between the IoT application and diagnostic devices, reducing average clinical result turnaround time by ~30%.
End-to-End Engineering: Developed a critical medical-results printing feature from scratch using React/TypeScript, CUPS, and the IPP protocol, receiving high praise from veterinary clinics.
Data Architecture: Designed event-driven ingestion pipelines using Apache Kafka, ensuring high data consistency across HUB, PIMS, ZDX, and Imagyst ecosystems.
Cost & Quality Leadership: Optimized Azure Application Insights to significantly reduce infrastructure costs, and introduced mutation testing and clean-code practices adopted team-wide.
Java Spring boot Apache Kafka IoT React.js
Tonai.app
AI Intonation CoachFounder Founder & Lead Developer
HIGH TECH
enero de 2024 - abril de 2026 (2 años y 3 meses)
Barcelona, España
Designed, built, and launched a cross-platform music practice companion providing real-time audio analysis (intonation, vibrato, dynamics) for string, wind, and vocal musicians. Available on iOS and Android.
Full-Product Ownership: Formulated and executed the entire product lifecycle solo, from UI/UX design to cross-platform deployment (React Native) and App Store/Google Play release.

On-Device Audio Processing: Architected a high-performance, on-device pitch-analysis engine to deliver latency-free visual feedback to users.
AI Integration: Implemented an LLM-powered coaching feature using the Anthropic Claude API to automatically synthesize session data into personalized practice plans.
Global Scalability & Features: Shipped core modules including progress tracking, an advanced tuner, and a drift-free metronome; fully localized across 10 languages to support an international user base.
• App Store • Google Play
Android iOS React Native LLM Artificial Intelligence (AI)

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B.Sc. in Software Engineering
University of Palermo
2023
Professional Frontend Developer
UTN — Universidad Tecnológica Nacional
2020
Professional Frontend Developer

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Emiliano Sebastian

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