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I'm Rafael Ortega, a Senior Full-Stack and AI/ML Engineer with 8 years of experience delivering client-facing, production-grade web and cloud solutions. I specialize in building full-stack applications using Next.js, React, TypeScript, Python, SQL, and cloud services, and I integrate GenAI capabilities (OpenAI, Bedrock, LangChain, and RAG) into real-world business workflows. I'm driven by clear communication, strong documentation, and ownership of delivery outcomes in fast-paced consulting environments. I partner with clients, stakeholders, and sales teams to design scalable architectures, lead end-to-end implementations, and ensure solutions are delivered on time, within scope, and production-ready.…I'm Rafael Ortega, a Senior Full-Stack and AI/ML Engineer with 8 years of experience delivering client-facing, production-grade web and cloud solutions. I specialize in building full-stack applications using Next.js, React, TypeScript, Python, SQL, and cloud services, and I integrate GenAI capabilities (OpenAI, Bedrock, LangChain, and RAG) into real-world business workflows. I'm driven by clear communication, strong documentation, and ownership of delivery outcomes in fast-paced consulting environments. I partner with clients, stakeholders, and sales teams to design scalable architectures, lead end-to-end implementations, and ensure solutions are delivered on time, within scope, and production-ready.

Rafael Ortega

Web Developer, Back-End Developer, Front-End Developer, +7

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I'm Rafael Ortega, a Senior Full-Stack and AI/ML Engineer with 8 years of experience delivering client-facing, production-grade web and cloud solutions. I specialize in building full-stack applications using Next.js, React, TypeScript, Python, SQL, and cloud services, and I integrate GenAI capabilities (OpenAI, Bedrock, LangChain, and RAG) into real-world business workflows. I'm driven by clear communication, strong documentation, and ownership of delivery outcomes in fast-paced consulting environments. I partner with clients, stakeholders, and sales teams to design scalable architectures, lead end-to-end implementations, and ensure solutions are delivered on time, within scope, and production-ready.…I'm Rafael Ortega, a Senior Full-Stack and AI/ML Engineer with 8 years of experience delivering client-facing, production-grade web and cloud solutions. I specialize in building full-stack applications using Next.js, React, TypeScript, Python, SQL, and cloud services, and I integrate GenAI capabilities (OpenAI, Bedrock, LangChain, and RAG) into real-world business workflows. I'm driven by clear communication, strong documentation, and ownership of delivery outcomes in fast-paced consulting environments. I partner with clients, stakeholders, and sales teams to design scalable architectures, lead end-to-end implementations, and ensure solutions are delivered on time, within scope, and production-ready.

Available to hire

I’m Rafael Ortega, a Senior Full-Stack and AI/ML Engineer with 8 years of experience delivering client-facing, production-grade web and cloud solutions. I specialize in building full-stack applications using Next.js, React, TypeScript, Python, SQL, and cloud services, and I integrate GenAI capabilities (OpenAI, Bedrock, LangChain, and RAG) into real-world business workflows.

I’m driven by clear communication, strong documentation, and ownership of delivery outcomes in fast-paced consulting environments. I partner with clients, stakeholders, and sales teams to design scalable architectures, lead end-to-end implementations, and ensure solutions are delivered on time, within scope, and production-ready.

Skills

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Expert

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Intermediate

Intermediate

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Language

English

Fluent

Work Experience

AI Software Engineer at BlockUnited Remote

November 1, 2023 - November 1, 2025

Built end-to-end ML pipelines that automate data ingestion, training, and deployment, reducing model development time by 40% and supporting 10+ production-grade AI features across multiple product modules. Fine-tuned transformer-based LLMs for domain-specific tasks, improving accuracy by 28% and reducing hallucinations by 15% across 5+ high-traffic workflows. Engineered vector search with FAISS/Weaviate, enabling 3× faster semantic retrieval over 100k+ documents and improving recommendation and search accuracy. Implemented optimized LLM inference services with sub-250 ms latency, reliably handling 5k+ daily user requests and supporting scalable real-time interactions during traffic spikes. Automated labeling, pre-processing, and augmentation pipelines reducing manual data prep by 60% and improving data set consistency by 30% across 8+ initiatives. Developed evaluation tools tracking drift, latency, and hallucinations, increasing model reliability by 25% and reducing production-level f

Senior Full-Stack Engineer at Toast

January 1, 2020 - October 1, 2023

Led development of scalable web platforms using React, Node.js, and TypeScript; delivered 20+ production features and improved page performance by 35% via optimized rendering and API response handling. Architected microservices with Node.js and Docker, reducing system coupling by 40% and enabling independent deployment of 15+ services across core product workflows. Improved API throughput by 2.5× through caching, query optimization, and load balancing, supporting 100k+ monthly active users with no performance degradation. Built reusable UI component libraries in React, cutting development time for new interfaces by 45% and ensuring consistent UX across 5+ product teams. Optimized SQL/NoSQL database schemas and queries, reducing read/write latency by 30% and supporting data growth beyond 1M+ records with stable performance. Implemented CI/CD pipelines with GitHub Actions and Kubernetes, reducing deployment time by 60% and enabling daily production releases with near-zero downtime. Desi

App Developer at Adroit Software Inc

November 1, 2018 - October 1, 2019

Developed high-performance mobile apps for iOS/Android, delivering 15+ core features and improving load times by 35% through optimized rendering, caching, and background processing. Implemented responsive UI and reusable components, reducing interface development time by 40% and ensuring consistent design quality across 3+ major product releases. Integrated REST and GraphQL APIs, improving data sync reliability by 30% and supporting 50k+ active users with stable, real-time updates across devices. Optimized app performance via profiling and refactors, cutting crash rates by 45% and reducing app size by 20% while improving overall user retention. Implemented secure authentication, push notifications, and in-app messaging, increasing user engagement by 22% and supporting 10k+ daily interactions. Automated CI/CD pipelines for mobile builds, reducing delivery time by 60% and enabling rapid weekly releases. Created extensive unit/UI tests covering 80%+ of logic, reducing production bugs by 5

Software Developer at Nextiva

June 1, 2017 - May 1, 2018

Developed scalable backend services using Node.js and Python, delivering 20+ production features and improving API response times by 30% through optimized routing and caching strategies. Built modular, reusable code components that reduced development time for new features by 40% and improved code maintainability across 5+ active projects. Optimized database queries and schemas, cutting read/write latency by 35% and supporting system growth to 1M+ records with no performance issues. Implemented automated testing with 80%+ coverage, reducing production bugs and enhancing release stability. Integrated third-party and internal microservices, increasing data reliability and supporting 100k+ monthly user interactions. Reworked legacy modules to reduce technical debt by 30% and improve application stability, enabling faster deployment cycles for multiple teams. Implemented CI/CD pipelines with GitHub Actions/Jenkins, cutting deployment time by 55% and enabling consistent weekly releases with

AI Software Engineer at BlocUnited Remote (Texas)

November 1, 2023 - November 1, 2025

Designed and implemented end-to-end AI/ML solutions for enterprise applications, automating data ingestion, model training, and deployment workflows; reduced development cycles by 40% while enabling production-grade AI features across multiple workflows.

Senior AI Software Engineer at BlockUnited Remote

November 1, 2023 - November 1, 2025

Senior Full-Stack Engineer at Toast On-site

January 1, 2020 - October 1, 2023

Led development of scalable web platforms using React, Node.js, and TypeScript; architected microservices with Docker and orchestrated deployments; improved API throughput via caching and load balancing for 100K+ monthly active users.

Senior Software Engineer at BlocUnited

August 1, 2018 - Present

Led full-stack development for a fitness training platform (web and mobile). Implemented real-time workout tracking and personalized recommendations, boosting user engagement by 40%. Optimized frontend performance, reducing load times by 50%, and streamlined CI/CD pipelines to cut deployment time by 35%. Enhanced user communications with targeted messaging, raising retention by 20%. Implemented secure payment processing increasing conversion by 25%. Automated deployment cut deployment times by 40%. In Admin Dashboard, optimized MongoDB queries reducing response times by 30% and implemented RBAC security, reducing unauthorized access by 50%. Built analytics dashboards for insights and mentored junior developers, contributing to a 30% increase in team productivity.

Full Stack Engineer at Works Applications Co Ltd

November 1, 2016 - July 1, 2018

Developed frontend and backend for the Automatic Workflow Management System. Implemented responsive UI with React.js, increasing user satisfaction by 30% and reducing user errors by 25%. Designed and optimized SQL/NoSQL schemas, improving data retrieval by 40% and query performance by 35%. Integrated authentication/authorization to improve security and reduce vulnerabilities by 50%. Collaborated with stakeholders to prioritize features, boosting project completion efficiency by 20%. Conducted code reviews, reduced bugs by 30% and mentored juniors, enhancing overall system stability.

Technology Consulting Intern

March 1, 2015 - July 1, 2015

Spearheaded frontend development for an E-commerce Marketplace website and Admin Dashboard. Implemented responsive interfaces, Redux state management, and GraphQL data fetching, resulting in a 40% improvement in load times and a 25% increase in average order value. Built admin APIs, implemented data visualizations, and enforced authentication/authorization to improve security and compliance. Mentored junior developers and collaborated with cross-functional teams to deliver features on schedule.

AI Software Engineer at BlocUnited Remote

November 2, 2023 - November 2, 2025

Designed and implemented end-to-end AI/ML solutions in Python for enterprise applications, automating data ingestion, model training, and deployment workflows, reducing development cycles by 40% while supporting 10+ production-grade AI features. Developed and fine-tuned transformer-based and generative AI models (PyTorch) for domain-specific NLP use cases, improving model accuracy by 28%, reducing hallucinations by 15%, and enhancing reliability across multiple high-impact workflows. Built retrieval-augmented generation (RAG) systems using vector databases (FAISS/Weaviate) and Python-based services, enabling 3× faster semantic retrieval over 100K+ documents, significantly improving contextual accuracy and decision support. Engineered scalable AI inference services in Python, achieving sub-250 ms latency and reliably handling 5K+ daily requests, with performance optimization strategies to support enterprise-scale usage. Implemented reusable AI/ML frameworks, libraries, and utilities fo

AI Software Engineer at BlockUnited Remote (Texas)

November 1, 2023 - November 1, 2025

Designed and implemented end-to-end AI/ML solutions in Python for enterprise applications, automating data ingestion, model training, and deployment workflows, reducing development cycles by 40% while supporting 10+ production-grade AI features. Engineered scalable AI inference services in Python (PyTorch) achieving sub-250 ms latency and reliably handling 5K+ daily requests; implemented performance tuning and monitoring frameworks. Built and finetuned transformer-based models for domain-specific NLP tasks, improving accuracy by 28%, reducing hallucinations by 15%, and increasing reliability across high-impact workflows. Developed reusable AI/ML frameworks, libraries, and utilities for data preprocessing, labeling, augmentation, and evaluation, reducing manual data prep by 60% and improving dataset consistency by 30%. Collaborated with data scientists, product managers, and engineering teams to translate business and clinical requirements into secure, compliant AI solutions aligned wit

Software Developer at Nextiva On-site

June 1, 2017 - May 1, 2018

Developed scalable backend services using Node.js/Python, delivering 20+ production features and improving API response times by 30% through optimized routing and caching. Built modular, reusable code components to reduce development time for new features by 40% and improve code maintainability across 5+ active projects. Optimized database schemas and queries, cutting read/write latency by 35% and supporting growth to 1M+ records with stable performance. Implemented automated testing with 80%+ coverage, reducing production bugs and improving release stability. Integrated third-party APIs/internal microservices, increasing data reliability and supporting 100K+ monthly user interactions. Re-factored legacy modules, reducing technical debt by 30% and enabling faster deployment cycles for 3+ teams. Built CI/CD pipelines with GitHub Actions/Jenkins, cutting deployment time by 55% and enabling consistent weekly releases with minimal downtime. Improved system observability via logging/monitor

Senior Full Stack & AI/ML Engineer at Nexlify Solutions

November 1, 2023 - November 1, 2025

Led modernization and delivery of enterprise conversational AI systems, architecting end-to-end chatbot solutions using LangChain, API integrations, and stateful context management. Designed React/Next.js dashboards for fleet operators; implemented RBAC and analytics workflows; engineered PySpark ETL on Databricks to produce Delta Lake tables for downstream analytics, RAG retrieval pipelines, and ML model training. Partnered with client stakeholders to translate requirements into GenAI-enabled architectures; served as technical lead for full-stack delivery, balancing frontend performance, backend scalability, and cloud cost optimization across AWS and Azure. Implemented governance layers to safely expose enterprise APIs to LLMs, and built production-scale AI services with FastAPI + AWS Fargate. Designed ML lifecycle architecture with Kubeflow/MLflow, led distributed training using HuggingFace Accelerate and Ray, and developed AI-assisted coaching tools and MCP tooling integration. Also

Senior Full Stack / AI Engineer at Toast

January 1, 2020 - October 1, 2023

Architected and delivered a company-wide Analytics Platform integrating 7 product lines via module federation in React, Next.js + TypeScript. Built autonomous analytics agents for large-scale call/event data, implementing multi-agent RAG patterns, and delivering executive-ready insights. Overhauled performance with event-driven orchestration (Kafka) and Redis-backed state for 2M+ daily interactions. Refactored legacy monoliths to Go microservices, introduced Redis caching, optimized Snowflake + GCP Dataflow ETLs, and implemented GraphQL federation. Delivered real-time dashboards with Weaviate vector search and improved query latency from seconds to sub-second levels. Migrated 40+ services to AWS EKS with Istio, achieving 99.99% uptime and cost reductions. Managed data migrations from MySQL to Snowflake and built a scalable analytics backend.

Full Stack Developer at Nextiva

June 1, 2017 - October 1, 2019

Developed 15+ client-facing full-stack applications using Python (Django/Flask) for ETL and data pipelines, Go microservices on Kubernetes, and React + TypeScript frontends with Redux. Improved data insight delivery by 25% and reduced rendering latency for 50K+ data points by 40%. Built real-time data architecture with Kafka, Redis, and GCP Dataproc + Azure SQL to handle 500K+ daily events with sub-100ms P95 latency. Mentored junior engineers and led cross-functional projects, contributing to the growth of an in-house engineering organization.