Brian Sullivan
Senior web engineer with 15+ years building full-stack applications, APIs, automation, and high-scale data systems across SaaS, ad tech, and e-commerce, with recent work focused on LLM integrations, AI-assisted workflows, and agentic tooling.
Experience
Marketfuel
Senior Full-Stack Web Engineer • April, 2024 — October, 2025
- Led third-party integrations architecture across backend services and React interfaces for a SaaS e-commerce platform used by marketing agencies
- Built features end-to-end across React and Ruby on Rails, including idempotent Rails APIs consumed by the frontend
- Helped scale and modernize the platform for multi-tenancy while strengthening SOC 2-aligned security, dependency management, and compliance readiness
- Reduced automated test suite runtime by 80% through improved test coverage and CI pipeline automation
- Lowered AWS costs by 32% by monitoring, deploying, and tuning services for better scale efficiency
- Used Sidekiq to build background processing and automation workflows that improved response times and reduced server load
Flashtalking by Mediaocean
Took on the Director role in 2023 after years building feeds, automation, and ad-serving systems within Mediaocean's global Feeds organization.
Director, Feeds Automation & Engineering • Feb, 2023 — Sept, 2023
- Led technical direction and engineering best practices for a global team building feed-driven automation and dynamic creative systems across PHP, Docker, and AWS
- Reviewed pull requests, coordinated releases, and led software deployments using Git, Bitbucket, and Jenkins
- Developed reusable internal and client-facing tools, including wrappers around internal APIs that streamlined delivery workflows
- Ran code and documentation reviews that improved alignment, maintainability, and shared ownership across projects
- Managed technical delivery for display, social, and dynamic video campaigns
Mediaocean
Senior Web Services Engineer • May, 2015 — Feb, 2023
- Built and operated high-availability services and applications that supported billions of ad requests across the web
- Developed automated data ingestion and transformation pipelines for client APIs and product catalogs, powering scalable services used in ad serving
- Served as lead engineer for feeds, retargeting, social ad creation, and dynamic video automation across hundreds of campaigns
- Delivered solutions for major enterprise brands across automotive, travel, and retail, including Lexus, Audi, Nissan, American Airlines, JetBlue, Royal Caribbean, Best Buy, and Dell
Theatermania
Full-Stack Web Developer • May, 2013 — November, 2014
- Full-stack developer for Theatermania.com and WhatsOnStage.com websites
- Developed and maintained custom CMS for high-traffic sites specializing in theater news, reviews and ticketing
- Created custom WYSIWYG article editor for writers
- Implemented new responsive front-end design
Inkwell Global Marketing
Full-Stack Web Developer • Jun, 2010 — March, 2013
- Lead full-stack developer creating branded internal stores for businesses
- Developed and designed internal store websites for brands such as ADP, Grant Thornton, NYU
- Leveraged E-Commerce platforms such as Opencart and Shopify while developing other sites from scratch
- Developed OpenCart modules to add custom functionality
- Created custom payment gateway flows (PayPal, employee discount programs, etc) and user authentication systems while adhering to PCI compliance rules
Skills
Programming Languages & Frameworks
TypeScript / JavaScript, Node.js, jQuery, React, Redux, Angular, Ruby / Ruby on Rails, PHP, Symfony, Laravel, Python, Jekyll, Tailwind, CSS, HTML, Markdown, SwiftUI
Cloud Platforms
AWS (EC2, ECS, S3, CloudFront), Google Cloud, Render, Railway, GitLab Pages
Databases
DynamoDB, MongoDB, MySQL, PostgreSQL
Caching
Redis, Memcached
DevOps & CI/CD
Docker, Jenkins, CircleCI
Version Control
Git, GitHub, Bitbucket
Testing & QA
Cypress, Playwright, RSpec, Postman
Monitoring & Observability
Bugsnag, Sentry, Grafana, AWS CloudWatch
AI, LLMs & Agentic Tools
OpenAI/Anthropic API integrations, agentic workflows, prompt engineering, model evaluation, workflow automation, MCP integrations, Claude Code, Codex, content moderation, NLP (Natural Language Processing)
Scripting & CLI
Bash, PowerShell
Project & Collaboration
Jira, Linear, Asana
Ad Tech & Social
Facebook Business Manager, Opal, Google AdSense, Google AdMob, TikTok Ads Manager, Snapchat Ads Business Manager
CMS
WordPress, Shopify, OpenCart
Background Jobs & Queues
Sidekiq, cron
Authentication & Security
OAuth, JWT, Single Sign-On (SSO), Content Security Policy (CSP)
Technical Proficiencies
REST APIs, microservices, AI integrations, data parsers, ETL pipelines, content management systems, large-scale data ingestion and retrieval, full-stack development
Education
Stockton University
Bachelor of Arts, English & New Media Studies • 2004 — 2010
recipient of New Media Studies Award for social app "Treefingers"
Apps & Projects
newsquick.app
Founder, Developer • 2025 — Present
AI-powered news aggregation product across iOS and web using LLM-driven summarization, content grouping, prompt design, and workflow automation.
deadreader.com
Founder, Writer • 2022 — Present
A personal blog about horror literature, including reviews and personal writing.
Social Links
- Github: https://github.com/bsullivan-io
- Twitter: http://twitter.com/bsullivanwrites
- LinkedIn: https://www.linkedin.com/in/brian-sullivan-8a896166/
- Website: http://bsullivan.io