Active Focus
Building autonomous Agentic AI development pipelines on Google Cloud Platform using Gemini-integrated toolchains and Cloud Functions orchestration.
SKILLS
AI & Cloud
Full Stack
Enterprise Java
Data & DevOps
CONNECT
EDUCATION
B.S. Computer Science
Cal Poly San Luis Obispo, CA
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MARK R. SLOAN
SENIOR SOFTWARE ENGINEER · FULL STACK · CLOUD · AI
PROFESSIONAL SUMMARY
A career-spanning evolution from architecting monolithic J2EE enterprise backends—mastering SOAP/REST APIs, Hibernate ORM, relational SQL, and distributed SOA systems at scale—into a modern full-stack React/Node.js architect, and now into the frontier of Agentic AI orchestration on Google Cloud. With over 20 years of engineering discipline across R&D labs, Fortune 500 platforms, and independent cloud-native development, I bring both the foundational depth to navigate legacy complexity and the forward momentum to build self-healing, AI-integrated systems. I invite technical reviewers to audit my live Cloud-First infrastructure directly, rather than rely solely on credentials.
FEATURED SYSTEM: FINANCIAL PORTAL ECOSYSTEM
Note for Technical Reviewers: This portal is maintained as a live, transparent window into my Cloud-First engineering methodology—shifting the evaluation from paper credentials to verifiable, production-grade execution.
Multisite Monorepo
React 19 / Next.js apps sharing a single Firebase deployment pipeline across 3 distinct portals with automated subdomain provisioning.
Serverless Orchestration
Node.js Cloud Functions driving real-time budget forecasting, recurring transaction processing, and push-notification delivery across 1,300+ real transactions.
Data Isolation at the DB Layer
Firestore collection prefixing engine with concurrent Security Rule enforcement—total logical separation between Production and Sandbox environments.
Agentic-First Development
Entire ecosystem developed in an AI pair-programming workflow using Gemini-integrated toolchains, demonstrating high-velocity cloud-native delivery.
PROFESSIONAL EXPERIENCE
TransUnion
Senior Software Engineer · Platform Modernization Lead
- Platform Modernization: Led the full architectural migration of consumer-facing fraud prevention platforms from legacy JQuery/SOAP stacks to a cloud-native Node.js/React/REST API architecture, increasing developer velocity by ~50% and enabling continuous delivery.
- Kubernetes CI/CD: Managed production Kubernetes clusters and Jenkins CI/CD pipelines, reducing mean-time-to-deployment by 40% and enabling zero-downtime microservice scaling.
- Enterprise Integration: Developed high-availability Java 8+ RESTful services ensuring secure third-party data interoperability across fraud-detection data pipelines serving millions of daily users.
- Observability: Established enterprise-wide monitoring via Grafana, Splunk, and Spotfire, reducing MTTR for critical incidents by 35%.
Vinfolio
Senior Software Engineer · API & Infrastructure Lead · Napa, CA
- REST API Engineering: Engineered REST APIs for seamless integration with TinEye's image-recognition service, with full Swagger documentation and contract-driven development.
- Database Architecture: Designed scalable relational schemas supporting multi-tenant customer and admin app functionality; implemented Hibernate ORM for high-reliability data persistence.
- Cloud DevOps: Configured Jenkins CI/CD in a Dockerized environment on AWS EC2; assisted in designing the VueJS front-end for administrative tooling.
SRI International
Senior Software Engineer · R&D Infrastructure Architect · San Luis Obispo, CA
- SURF (Cloud Modernization): Spearheaded a microservices-based internal web app using Spring Boot, Spring Cloud, VueJS, and WebSockets to modernize R&D project staffing workflows.
- SIMON (Enterprise SOA): Contributed to a distributed SOA platform with a rules-based data entitlement module for secure SOAP/JAX-WS message handling and JEE/JPA migration.
- Rigel (R&D Systems): Refactored a 3D terrain mapping system (NASA Worldwind) from Ant to multi-module Maven, integrating CDI/JBoss Weld and migrating UI from Swing to JavaFX 2.0.
- uLanding (Web 2.0): Architected the full infrastructure for a higher-education social networking platform, including web framework selection and database strategy.
EARLIER ROLES
Yardi Systems · Goleta, CA
Software Engineer — Java enterprise property management platform
Morgan Stanley Online · San Francisco, CA
Software Engineer — Financial platform development (domain directly relevant to current financial portal work)
Nationsbanc / CRT · Chicago, IL
Software Engineer — Fixed-income trading systems
Cal Poly State University · San Luis Obispo, CA
Programmer Analyst → Senior Software Engineer
EDUCATION
B.S. Computer Science
California Polytechnic State University – San Luis Obispo, CA