Mitzael Serna

Sonora, Mexico · mitzael.serna@outlook.com · linkedin.com/in/mitzaelserna · github.com/kscius

Professional Summary

Senior Full-Stack ML Engineer and Tech Lead with 13+ years of experience architecting and building scalable web applications, microservices, AI-powered platforms, and robust backend systems across diverse technology stacks and programming languages. Proven versatility in full-stack development and machine learning, having successfully delivered projects using multiple languages (Python, JavaScript, TypeScript, C#, PHP, Elixir, Java) and frameworks (.NET, Node.js, FastAPI, PyTorch, React.js, Vue.js) across various industries and use cases. Currently building production AI systems with computer vision pipelines, LLM integration, and microservices architecture. Continuously adapts to and adopts emerging technologies, with a track record of quickly mastering new languages and frameworks to deliver innovative solutions. Experienced in leading cross-functional teams, designing distributed systems, and optimizing high-traffic applications handling 1M+ requests monthly. Expert in AI-assisted development workflows, machine learning infrastructure, and modern DevOps practices.

Technical Skills

Experience

Full-Stack ML Engineer — SoulGate
Dec 2025 – Present
  • Designed and implemented microservices architecture with 12+ ML services using FastAPI, PyTorch, and CUDA for GPU acceleration on AWS EC2 with NVIDIA instances.
  • Built API Gateway and orchestration layer (Express.js/TypeScript) coordinating multi-model inference pipelines for real-time biometric analysis.
  • Deployed production computer vision models including YOLOv8, EfficientNet-B0, ResNet, and Faster R-CNN for image classification and object detection.
  • Integrated Google Gemini LLM for automated narrative generation from structured analysis data, enabling personalized content creation.
  • Developed modern React 18 SPA with TypeScript, Material UI, Redux Toolkit, and Framer Motion, implementing real-time features using Socket.io.
  • Built image preprocessing pipelines using OpenCV, MediaPipe, and dlib for facial landmark detection and biometric feature extraction.
  • Reduced TTS service memory footprint from ~800MB to ~50MB by migrating to edge-based solution, optimizing infrastructure costs.
  • Containerized 15+ services with Docker and Docker Compose with optimized multi-stage builds for consistent deployments.
  • Implemented Stripe payment system handling subscriptions, credits, and usage tracking for SaaS billing model.
  • Built end-to-end pipeline processing 5 image types (frontal, profile, body, palms, eyes) in single request for comprehensive analysis.
Full-Stack Engineer · Tech Lead — Nufi
Sep 2024 – Sep 2025
  • Architected and developed KYC (Know Your Customer) system using .NET with C# and Razor, JavaScript, MS SQL Server, and Azure infrastructure, demonstrating proficiency across multiple technology stacks and ensuring compliance and secure data processing.
  • Built full-stack applications using Node.js, NestJS, React.js, and Vite, seamlessly transitioning between different technology ecosystems and integrating payment gateways (Stripe, NetPay, STP) for seamless transaction processing.
  • Led adoption of No-Code tools and AI-assisted development workflows using Cursor IDE, improving team productivity and standardizing development processes.
  • Designed and implemented agent notepad prompts to standardize flows and accelerate team productivity across cross-functional teams.
  • Mentored and led cross-functional teams in building scalable, user-centric solutions, applying MCP approaches (Graph Knowledge & Sequential Thinking) for faster problem-solving.
Full-Stack Engineer / Tech Lead — Paystand
Feb 2022 – Oct 2025
  • Promoted to Tech Lead (Jan 2025); drove backend innovation and maintained critical Acumatica ERP integration, ensuring seamless data flow between systems.
  • Architected and developed microservice connecting with Acumatica's custom Extended API, enabling bidirectional data synchronization for Payments, Invoices, Sales Orders, Refunds, Fees, Transfer Funds, and Disputes.
  • Created custom Acumatica project implementing Extended API endpoints, Push Notifications, Generic Inquiries, and Custom Email Templates, reducing integration complexity and improving workflow efficiency.
  • Resolved critical integration challenges including rate limiting issues and continuous integration complexities with Acumatica's platform, ensuring system reliability and performance.
  • Improved development delivery velocity by implementing AI-assisted workflows: internal GPTs, Cursor automation rules, and agent notepads using MCPs.
  • Worked across multiple programming languages and technology stacks (Elixir, TypeScript, JavaScript) within the same organization, demonstrating versatility and ability to adapt to project requirements and technology choices.
  • Designed and implemented microservices architecture in Elixir/Phoenix to optimize internal processes, demonstrating adaptability by mastering functional programming paradigms and improving system scalability and maintainability.
  • Implemented event-driven architecture using Apache Kafka for asynchronous messaging and real-time data streaming between microservices, ensuring reliable and scalable inter-service communication.
  • Maintained and expanded NetSuite integrations using TypeScript, ensuring data consistency across multiple ERP systems while working across different technology stacks.
  • Integrated Stripe and other payment processors to enable secure transaction processing and payment gateway integrations.
  • Built internal monitoring dashboards in Appsmith for proactive monitoring and incident reduction, improving system observability.
  • Containerized services with Docker and managed PostgreSQL/MySQL databases, optimizing deployment processes and database performance.
  • Collaborated across teams using GitLab and Jira in agile environments, ensuring efficient project delivery.
Web Developer — Fibotech Technologies
Aug 2020 – Jul 2025
  • Developed high-performance communication system using Twilio to mask personal phone numbers for customer contact, handling approximately 1 million requests per month with 99.9% uptime.
  • Integrated comprehensive Twilio-based solutions including WhatsApp, Voice, Emails, Flex for Cloud Call Centers, Twilio Studio, Twilio Functions, and WhatsApp Templates, enabling multi-channel customer communication.
  • Built mobile-first web applications using PHP, Node.js, and Express, ensuring responsive design and optimal user experience across devices.
  • Architected serverless APIs with Azure Functions and implemented caching strategies with Redis, reducing API response times and infrastructure costs.
  • Designed and managed Azure infrastructure including MS SQL Server database, Redis, Azure Functions, Event Hub, API Manager, and Ingest Manager, ensuring scalable and reliable system architecture.
  • Transitioned from full-time to hourly model (since 2024), maintaining high-quality deliverables while optimizing work structure.
Web Developer & DevOps Specialist — Judicial Branch of the State of Sonora
Jun 2016 – Feb 2020
  • Built critical application with custom PHP framework and MySQL, serving judicial branch operations with high reliability and security requirements.
  • Implemented database migrations and CI/CD automation using GitLab and Docker, reducing deployment time by 60% and improving release reliability.
  • Developed and executed DevOps strategy for reliable production deployments, ensuring zero-downtime releases and improved system stability.
Additional Roles
2012 – 2019
  • Tuukuul Network (2016–2019) — Developed mobile and web applications using PHP CodeIgniter framework and Ionic for cross-platform mobile development.
  • Prisco Desarrollos (2017) — Built modern web applications using Vue.js frontend framework and PHP backend.
  • Corporativo Operador de Tecnologías (2015–2016) — Developed native iOS applications using Objective-C and integrated with PHP backend services.
  • Grafav SA de CV (2015) — Full-stack development using .NET frameworks (C#), PHP, CodeIgniter, MySQL, and jQuery for enterprise applications.
  • CIAD (2012–2013) — Developed research support modules using .NET frameworks (C# and VB.NET), PHP, MySQL (Stored Procedures, Triggers, caching), and jQuery.

Education

B.S. in Information Technology
2010 – 2014
Universidad Tecnológica de Hermosillo

Additional Information