Senior Full-Stack AI Engineer (AWS)

David Lozano Rodriguez

**********@*****.*** +52-324-***-**** Tequila, Jalisco, México

linkedin.com/in/david-lozano-rodriguez-426288441 github.com/proteus1208 david-lr-portifolio.vercel.app/ SUMMARY

Senior Full Stack & AI Engineer with 8+ years of experience designing, building, and operating AWS cloud solutions for enterprise and client-facing environments. Strong expertise in AWS, Python, Node.js, TypeScript, Go, Lambda, serverless architectures, Cloud Native patterns, Terraform, CI/CD, and Agile delivery. Skilled in observability with CloudWatch, X-Ray, Datadog, and OpenTelemetry, plus security, cost optimization, code reviews, and cross-functional collaboration. Passionate about client engagement, knowledge sharing, and moving AI from experimentation into production.

TECHNICAL SKILLS

AWS Services: Lambda, EC2, S3, API Gateway, DynamoDB, CloudWatch, X-Ray, Config, IAM, Kinesis Cloud Patterns: Cloud Native, Serverless Architectures, IoT Back-ends, Highly Automated Delivery, Scalable Architecture

Programming: Python, Node.js, TypeScript, Go, Java, JavaScript Infrastructure & CI/CD: Terraform, Infrastructure as Code, CI/CD Pipelines, GitHub Actions, Docker, Git Observability: CloudWatch, X-Ray, Config, Datadog, Dynatrace, OpenTelemetry, APM, Logging, Tracing, Runbooks, Automation

Security & Cost: Security Best Practices, Cost Optimization, Resilience, IAM, Compliance Methodologies: Agile, Scrum, Code Review, Cross-Functional Collaboration, Client Engagement, Technical Documentation

AI & LLMs: AI-Assisted Development, Generative AI, Agentic AI, SFT, RLHF, RLMF, Prompt Engineering, RAG, LangChain, Anthropic Claude

PROFESSIONAL EXPERIENCE

Senior Python Developer, Turing 11/2024 - 01/2026

Remote

• Built and maintained Python -based backend services and microservices using FastAPI and Flask, supporting large-scale data processing pipelines handling millions of daily requests.

• Developed robust RESTful APIs ensuring seamless integration with frontend applications and third-party services, achieving 99.9% API availability.

• Designed scalable system architectures and optimized database queries (PostgreSQL, MySQL), improving overall application performance by 20%.

• Produced SFT training data focused on code reasoning, contributing to improved LLM model accuracy and instruction-following.

• Contributed to RLHF and RLMF pipelines by ranking and comparing model outputs with detailed preference rationales, enhancing response quality and safety.

• Led a development pod of 8 engineers, coordinating task execution, enforcing coding standards, performing code reviews, and ensuring on-time delivery across 5+ sprints.

• Implemented CI/CD pipelines using GitHub Actions, automated testing with pytest, and containerized applications with Docker for consistent production deployments.

• Built serverless workloads on AWS Lambda with CloudWatch monitoring and X-Ray tracing, reducing incident detection time by 40% across millions of daily requests. Full Stack Engineer, Petco México 02/2023 - 10/2024 Remote

• Architected headless e-commerce platforms using Next.js and React with TypeScript, integrated with Shopify Storefront API and Contentful CMS, serving 500K+ monthly active users.

• Developed backend services and RESTful APIs using Node.js and Express, supporting product catalog, cart, checkout, and real-time inventory management.

• Reduced page load times by 30% through image optimization, lazy loading, and edge caching strategies, directly increasing conversion rates by 12% generating $2M+ in additional revenue.

• Defined reusable component libraries and coding conventions, enabling consistent contributions across 5 development squads and AI-assisted workflows.

• Led performance optimization using Lighthouse and WebPageTest, achieving sub-second First Contentful Paint across all major browsers and devices.

• Collaborated with UX designers and product managers, conducted A/B testing on 15+ features to validate impact and align with business KPIs.

• Partnered with cross-functional teams across 5 squads to embed security and cost-optimization features, improving resilience for 500K+ monthly users.

Blockchain Architect & Full Stack Leader, Katana Inu 11/2020 - 01/2023 Remote

• Designed and built full-stack architecture for an online RPG gaming ecosystem with scalable microservices using Node.js, Express, Java/Spring Boot, and Python/FastAPI, supporting 100K+ concurrent users.

• Created responsive web and mobile interfaces using React.js, Angular, Vue.js, and Kotlin/React Native, improving user engagement by 25% and session duration by 30%.

• Built real-time video chat features using React and Twilio.js, enhancing platform interactivity and increasing user retention by 15%.

• Optimized database layer with PostgreSQL, MySQL, MongoDB, implementing Redis and Kafka for caching and message queuing, reducing API latency by 30%.

• Led Agile development processes, managing cross-functional teams of 12+ engineers, delivering 20+ major features on schedule with 99.5% on-time delivery rate.

• Integrated Web3 components including smart contracts and NFTs using Solidity and Web3.js, expanding the platform's capabilities into blockchain gaming.

• Designed and implemented scalable AWS architectures with an emphasis on reliability and cost efficiency, supporting 100K+ concurrent users.

Blockchain & Full Stack Developer, Teahouse Finance 11/2019 - 09/2020 Remote

• Developed full-stack DeFi applications using React.js, Angular, Vue.js, and Node.js, building secure trading interfaces for institutional fund managers.

• Built responsive UI/UX components with PHP, React.js, Angular, and Vue.js, boosting user engagement by 20% and daily active users by 15%.

• Created production-ready dApp on Ethereum using Solidity, Truffle, React, and Web3.js, processing 5,000+ daily transactions with high reliability.

• Integrated backend services with blockchain networks, ensuring seamless data flow between Web3 components and traditional web infrastructure.

• Implemented smart contract audits and security best practices, delivering secure, well-tested financial applications handling $10M+ in transaction volume.

• Deployed services on AWS with Docker and CI/CD pipelines, implementing security controls and monitoring for high-availability workloads.

Web Developer, Sam's Technology Company 08/2017 - 06/2019 Hong Kong (RAE)

• Developed full-stack web applications using JavaScript (React.js, Angular, Node.js, Nest.js), PHP, and Python, delivering high-performance platforms for enterprise clients.

• Built and maintained RESTful APIs and GraphQL endpoints, integrating frontend interfaces with backend services and external systems.

• Scaled microservices to handle high-traffic events, achieving 99.95% uptime during peak loads through load balancing and performance optimization.

• Created comprehensive unit and integration tests using JUnit and Jest, reducing production defects by 30% and improving code coverage to 85%.

• Participated in code reviews, pair programming, and cross-functional collaboration, ensuring code efficiency and knowledge sharing across 4 development teams.

• Optimized application performance, reducing server response time by 25% through query optimization and caching strategies.

• Automated infrastructure provisioning with Terraform and GitHub Actions, standardizing repeatable deployments across 4 development teams.

EDUCATION

Bachelor's Degree, Computer Science 2013 - 2017

The University of Huddersfield

ADDITIONAL INFORMATION

• Languages: Spanish (Native), English (Fluent).

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