MarkValdez

Architected and developed full-stack marketplace platform with SMS-driven listing creation, real-time WebSocket chat, and AI-powered product categorization using multi-cloud AI infrastructure

Built backend API with Rails 8, PostgreSQL, Redis, ActionCable WebSockets, background job processing with GoodJob/Sidekiq, and comprehensive test suite with RSpec

Developed modern frontend with Next.js 15, TypeScript, React 19, TanStack Query, shadcn/ui components, and real-time notifications

Implemented sophisticated AI pipeline: Langflow on Google Cloud VMs for core listing creation with OpenAI models, AWS Bedrock Claude models for image-to-product mapping via LangChain on EC2, and custom HuggingFace model for image background removal branding

Built Cloudflare Workers with Hono-based AI agents using @cf/meta/llama-4-scout-17b-16e-instruct for chat-based product listing edits via MCP tools connected directly to platform infrastructure

Integrated comprehensive observability with CloudWatch monitoring, Slack integration for notifications and workflow management, Twilio SMS/OTP communication, Stripe payments, AWS S3/CloudFront, and Sentry error tracking

Deployed production infrastructure with GitHub Actions CI/CD, multi-cloud architecture spanning AWS EC2/RDS, Google Cloud VMs, and Cloudflare Workers

Scrum team, biweekly sprints- contributed to PR reviews, sprint retrospectives, stand-ups, interviewing, cross-functional technical support, technical leadership and mentoring Junior Engineers

Worked primarily on Ruby backend building API integrations with Ebay, Shopify and 5 other marketplaces (REST/GraphQL). Developed greenfield projects including a price recommendation system

Developed modern front-end with Typescript and React, Blueprint, LaunchDarkly, Jest

Provided devops support utilizing: Postgresql/mysql Aura, datadog, Heroku, Amazon RDS/DMS/EC2, CI/CD with Github Actions, Sidekiq, Rspec for Unit/Integration test

Scrum team, biweekly sprints- contributed to retrospectives, stand-ups, interviewing, cross-functional technical support

Developed greenfield projects on a mature monolithic software platform in the Mental Healthcare industry (EDI batch systems and REST API)

New projects included integrating services from Stripe, AWS, Twilio, Mailchimp, Hubspot, Google Analytics and more using Ruby/Rails, React, JS, Postgres, Mongo, and more

Built a new SaaS product prototype that allowed client-side safe encryption to be applied to any HTML Form(including the support of files) for any existing website. NodeJS, React, Postgres, custom JWT auth, etc.

Extended and refactored the flagship SaaS offering, a management/development portal for Developers and Organizations to track and manage quantum-safe encryption products. Working alongside an existing React development firm from Canada, in a scrum environment, I took the lead of converting a custom PHP platform with vanilla JS to a Typescript, very modern and sophisticated React application(MobX, ChakraUI, etc.)

Worked on many projects in many languages and platforms. Validation of half a million URLs with recursive redirect follow. Partnered with Google Engineers for existing API optimization/extension for Google Smart Home.

Architected & Developed a modern management system for the largest US listings recycling dataset. Created a advanced and modern landing page generator for product specific material recycling with autonomous asynchronous deployments.

Developed on-demand reporting system to inform DOE and other B2B stakeholders for regional data analysis of raw materials and recycling options, including supplemental interactive data-visualization.

Architected and developed the core base(alpha/beta) for Geosite- a SaaS product for the planning and analysis of satellite imagery supporting collaboration of real-time cross-functional teams

Highly dynamic and modern web application built leveraging the most advanced emerging technologies within the Geospatial industry – React/Redux, Material Design, Ruby, Postgres, Mongo, Heavy GIS, Imagery APIs

AMZLB: Architect and built a SaaS marketing platform, directly with the CEO for thousands of Amazon sellers. This involved heavy investment in email technologies(custom server), Micro-service(5) cluster design, and custom asynchronous workloads and management(Sidekiq). Also made my first hire, a SWE for Front-end Development.

Ad Traffic Social Analytics: Fullstack development extending a Ad traffic analytics SaaS product

Traffic Segmentation Optimization: Built from the ground-up a cross-site, A/B, custom tracking solution/pipeline for segment-based mapping and experimentation, similar to Optimizely

FinTech Payment Features: Contributed custom payment features to an in-production SaaS product for hundreds of Financial Advisers in the FinTech space

Zither iOS App: Migrating Parse server API to standalone service for in-production iOS app with a large user-base

Web Developer III, Worked on a 6 member scrum team, in-house, to redevelop the organizations underlying web page system to a modern responsive modular architecture

This involved creating a custom Drupal distribution that is extended from Panopoly(in-place page building, custom widgets), PHP, SASS, Twitter Bootstrap, MySQL, JS(Backbone, 3rd party APIs), A/B testing framework

Lead front-end development of a in-production single-page SaaS offering, 'DataThor', a social-media information analytics/data-visualization web application

Helped resolve day-to-day operational JIRA tickets centered around DataStax Enterprise(DSE) and OpsCenter for hundreds of technology innovators

Developed tools such as Hector Launcher that increased productivity through the automation of environment and frequently performed Cassandra operations(Java)

Demonstrated aptitude to handle a diverse range of problems within a very complex domain that is inherent to Cassandra and the associated base supported technologies of DSE(Hadoop HDFS, Solr, Hive, PIG, Sqoop)

Employed various languages in an self-directed agile environment, centered around the companys Drupal website as demanded by the concurrent multiplicity of various projects and their associated diverse domains

Designed and developed a research tool add-on for Mozilla Firefox that could scan any webpage for real-time keywords and inject a link which deployed the information console for that term

Designed and developed a news widget for the top Blog networks(Blogger, Wordpress, etc.) that required a single import statement which extended and incorporated any Blog to the GUp! infrastructure

Designed and implemented company websites(Web 2.0 technologies: jQuery, AJAX, PHP, MySQL, various APIs)

Created many diverse innovative designs and parallel variant systems that served to only maximize user experience through a constant deployment of HCI practices and user-developmental methodologies such as use cases

Designed and administrated data employing best practices to ensure data integrity(ER diagrams, NF standards, UML)

Developed curriculum and instructed/lectured for 15 technical/university-transferable Computer Science courses. Lead the Database and Web Programming specialization certifications in the Computer Information Technology department

Courses (size 5-30) that I designed include: Relational Database Theory, MySQL, Microsoft SQL Server, Client-side Web Programming (Javascript, AJAX), Server-side Web Programming (PHP, PERL), Intro to Object Oriented Programming, Operating Systems, Data Structures (Java), XML and Web Services, JSP and Servlets