About Daniel
Software Engineer building and scaling production systems in startups and scale-ups. Strong ownership mindset, with hands-on experience simplifying complex codebases, improving system reliability, and driving technical decisions.
Spanish
Native or bilingual
English
Fluent
Remote only
Primarily works remotely
Experience
- InternxtBackend Engineer (Code Owner)January 2025 - Today (1 year and 6 months)Valencia, Spain✅ Code owner of Internxt Drive for Windows, serving 1M+ users and managing 5 petabytes of data, contributing to an open-source platform ranked #20 in the Deloitte Technology Fast 50 (2025).✅ Led a simplicity-first refactor of a complex and unstable Node.js codebase, reducing it from 32k → 15k lines, increasing test coverage from 7% → 45% and cutting customer-reported issues by 80%.✅ Eliminated excessive CPU usage by designing and implementing a custom Windows file system watcher as a C++ native addon (node-gyp), reducing idle CPU consumption to near 0%.✅ Redesigned the synchronization engine by introducing checkpoint-based sync, recovery sync and lazy loading, enabling the system to scale from ~10k files to effectively unbounded datasets.
- Kurita GroupTech LeadCHEMICALSeptember 2023 - January 2025 (1 year and 4 months)✅ Tech Lead in a 12-person team, architecting an IoT platform with Go, PostgreSQL, Kafka, Snowflake to process telemetry from globally distributed energy devices (~2M events/day).✅ Designed a hybrid ingestion pipeline (Snowflake + polling → Kafka) and built Go microservices to validate sensor thresholds, generate alerts and trigger idempotent notification workflows.✅ Implemented event-driven patterns (consumer groups, retries with backoff, DLQ) ensuring reliability under external failures and added observability using Prometheus, Grafana and Loki.✅ Integrated real-time and analytical layers with Snowflake and Power BI, collaborating with DevOps and data teams to automate infrastructure using Terraform and Azure DevOps.✅ Implemented secure authentication and authorization using Microsoft Entra ID (Azure AD), validating JWT tokens with rotating signing keys and enforcing role-based access control.
- SendmeiCo-FounderLOGISTICS AND SUPPLY CHAINNovember 2018 - August 2020 (1 year and 9 months)Valencia, Spain✅ Developed a logistics SaaS platform (Django, React and PostgreSQL) integrating shipping carriers like CTT and GLS and ecommerce platforms like Shopify and WooCommerce into a unified system.✅ Engineered an event-driven microservices backend using Django REST Framework + GraphQL, Celery workers, RabbitMQ and Django Channels for real-time WebSocket collaboration.✅ Deployed on Docker with Nginx reverse proxy (SSL/TLS, HTTP/2, WebSocket upgrade), Gunicorn/Uvicorn dual-server setup and multi-environment pipelines (dev/staging/prod).
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Education
- Computer Engineering, Artificial IntelligenceUniversitat Politècnica de València2023✅ Gave more than 30 private lessons to 10 classmates during the second and third year courses. ✅ Authored a paper optimizing the Spectral Clustering algorithm, achieving significant performance improvements compared to scikit-learn's DBSCAN, KMeans+ and Spectral Clustering algorithms.