Brian Ocasio.

I'm a backend engineer who likes the hard parts: event streams, service boundaries, data migrations and the platforms other teams build on. I've spent 8+ years shipping Java, Kotlin, Spring WebFlux/Boot and NestJS services on AWS and Kubernetes, backed by PostgreSQL and Kafka.

At The Walt Disney Company I'm modernizing the payment and revenue platforms behind Disney Cruise Line. Before that I worked on USCIS E-Verify and myUSCIS, high-traffic government systems where I led an accounts team and an Oracle-to-PostgreSQL migration.

I also lean hard into AI-assisted engineering: spec-driven development with Cursor and Claude Code, agent orchestration, MCP servers and GraphRAG tooling. Outside my day job I founded Qbon and build the JYC Holdings portfolio of products.

• Event-driven architecture

  Kafka producers and consumers, change-data events, and services that react instead of poll.

• Payments and fintech

  Cloud-native financial microservices and a payment platform integrating Apple Pay, PayPal and more.

• Government-scale platforms

  Spring Boot microservices and React micro-frontends for USCIS E-Verify and myUSCIS.

• AI-assisted engineering

  Spec-driven development, agent orchestration, MCP servers and GraphRAG knowledge tooling.

1. 1. Jun 2025 – Present

      Senior Software Engineer

      The Walt Disney Company · Full-time

      Leading the design and development of next-generation financial services supporting Disney Cruise Line, modernizing legacy payment and revenue platforms while driving adoption of AI-assisted engineering practices across the organization.

      Helped modernize legacy systems with Kafka-based, event-driven architecture. Built an in-house service that generated events from database table changes, reducing processing time for key operations by 90%.

      • Leading the design and implementation of cloud-native financial microservices using Java, Spring WebFlux, and event-driven architectures to replace legacy services and improve scalability, resilience, and performance.
      • Contributed to the foundational architecture of the Disney Cruise Line SEAS modernization initiative, migrating core backend services from .NET to Spring WebFlux, establishing shared libraries, engineering standards, and reusable platform components adopted across multiple teams.
      • Designed and implemented backend automation services using NestJS, reducing manual effort across revenue management and payment operations.
      • Partnered with Disney's internal Payments platform team and frontend engineers to deliver a new payment processing platform integrating Apple Pay, PayPal, and additional payment methods, simplifying API contracts and reducing client integration complexity.
      • Evaluated and integrated third-party payment technologies by developing Python tooling to benchmark and validate GraphQL APIs against existing REST-based vendor integrations.
      • Introduced AI-assisted documentation and specification-driven development workflows using Cursor AI and GitHub Copilot, reducing feature implementation time by approximately 50% while improving engineering documentation quality.
      • Orchestrated AI agents to analyze and document hundreds of platform services, generating architectural context that accelerated system discovery, platform design, and engineering onboarding.

2. 1. Feb 2024 – Present

      Founder & Lead Engineer

      Qbon App · Part-time

      Investor, co-owner, and engineer.

      Developing technologies to change customer engagement at sit down restaurants focusing on improving and streamlining front of house operations and diner experience.

      • Introduced Claude Code orchestrated development allowing us to increase development speed and reduce to market time allowing us to increase our productivity by 50-70%.
      • Using GraphRAG techniques to build internal knowledge base tooling with efficient knowledge retrieval and graph traversal capabilities.
      • Developed route based context windows to allow developers to more effectively document and work on applications using Claude Code.
      • Working with Raspberry Pis as IoT devices in order to control Electronic Paper displays for a network of displays that change with twice daily frequency.
      • Developed MCP server that scrapes data from a source, stores it in a Redis instance for fast retrieval from an AI agent hooked up to a live call setting.

3. 1. Feb 2025 – Jun 2025

      Senior Software Engineer

      Korn Ferry · Contract

      Same as Disney role; moved to the full-time Disney position within a few months after joining.

4. 1. Jul 2023 – Feb 2025

      Senior Software Engineer (Independent Contractor)

      USCIS · Contract · Greater Orlando

      Worked primarily as a Senior Backend Engineer supporting both the myUSCIS and E-Verify platforms through contracts with Alethix/IntelliBridge and 540.co, delivering modern web applications and backend services for high-traffic government systems.

      • Developed full-stack solutions using React, React Native, Java, Spring Boot, Ruby on Rails, and NestJS.
      • Designed and implemented new onboarding workflows enabling legal organizations to invite and manage paralegals and legal representatives within the myUSCIS platform.
      • Modernized the Secure Inbox React micro-frontend by migrating to functional components, Context API, and RTK Query, improving maintainability, performance, and data management.
      • Extended Ruby on Rails REST APIs by implementing new features, optimizing data retrieval, and improving case data caching.
      • Contributed to the migration of the legacy Ruby on Rails Accounts application to a modern React-based architecture.
      • Designed and developed Spring Boot micro-services supporting the E-Verify platform during modernization initiatives.
      • Developed and enhanced React micro-frontends for E-Verify, delivering new user-facing functionality across the Accounts platform.
      • Mentored junior engineers through code reviews, architecture discussions, and engineering best practices.

5. Maximus

   1. Feb 2023 – Jul 2023

      Lead Software Engineer

      Full-time · Remote

      Led the Accounts Team consisting of five software engineers and two QA engineers responsible for the ongoing development of the USCIS E-Verify Accounts platform built with Spring Boot microservices, React micro-frontends, Kafka, PostgreSQL, and AWS.

      • Led backend development for the migration from Oracle to PostgreSQL, redesigning data models, executing production data migrations, and validating application integrity through regression testing.
      • Designed and implemented the ATNON account termination automation process, processing hundreds of inactive E-Verify accounts daily.
      • Designed and implemented the ATNON notification system, delivering automated inactivity notifications to thousands of users and supporting large-scale account lifecycle management.
      • Led development of expanded onboarding workflows integrating with multiple government systems to validate user identity and account eligibility.
      • Served as Release Manager for the Accounts platform, coordinating releases, feature flags, API contract definitions, service security configurations, and production deployments.
      • Implemented Kafka event consumers enabling event-driven communication across E-Verify services while collaborating with DevOps teams to improve deployment pipelines and release efficiency.
      • Partnered with USCIS product owners, engineering leadership, and cross-functional teams to define quarterly roadmaps, align technical direction, and deliver platform enhancements.
      • Advised USCIS stakeholders on technical architecture and implementation strategies for new onboarding capabilities and account lifecycle features.

   2. Feb 2022 – Feb 2023

      Senior Software Engineer

      Full-time · Remote

      Served as a Senior Backend Engineer on the USCIS E-Verify Accounts team, developing and modernizing services supporting account onboarding, account lifecycle management, and platform modernization initiatives.

      • Developed backend services and REST APIs using Spring Boot while contributing to React micro-frontends and maintaining legacy Ruby on Rails services during modernization efforts.
      • Led migration of legacy account models to an improved domain model, writing database migration scripts and optimizing SQL queries to improve application performance and maintainability.
      • Designed and developed a bulk company onboarding feature enabling organizations with multiple locations to onboard significantly faster through automated data import workflows.
      • Collaborated with authentication, core platform, product, and DevOps teams to deliver cross-service functionality across the E-Verify ecosystem.
      • Participated in production on-call rotations, diagnosing and resolving service issues using AWS ECS, Splunk, and New Relic.
      • Mentored junior engineers through design discussions, code reviews, and technical guidance.

6. 1. Mar 2020 – Feb 2022

      Software Engineer

      flexEngage · Full-time · Orlando, Florida

      Served as a Backend Engineer developing cloud-native applications across multiple product lines, working within both monolithic and microservice architectures using Java, Kotlin, Scala, TypeScript, Python, and AWS.

      • Developed and maintained backend services using Spring Boot, designing and extending cloud-based microservices supporting customer engagement and e-commerce platforms.
      • Contributed to a large-scale migration from a legacy Backbone.js frontend to React and TypeScript, serving as one of two engineers leading the frontend modernization effort.
      • Designed and implemented a Spring-based API Gateway to route requests between the legacy monolith and newly developed microservices, enabling incremental platform modernization.
      • Built and maintained Angular applications, deploying static web assets to Amazon S3 as part of the company's e-commerce platform.
      • Developed Infrastructure as Code using Terraform and automated deployments through Bitbucket Pipelines to provision and manage AWS resources.
      • Designed Python ETL workflows using Apache Airflow to extract, transform, and load e-receipt data into Amazon S3 and Snowflake, supporting large-scale analytics and reporting.
      • Developed serverless testing infrastructure using AWS Lambda, API Gateway, Python, and Terraform to simulate third-party integrations for internal testing.
      • Designed and built an internal reporting platform that generated customer-facing e-receipt analytics and business statistics.
      • Served as the primary engineer for an in-house SMTP processing platform that received PDF receipts from POS systems, parsed transaction data, and generated digital e-receipts using Node.js, Java, and Scala.
      • Participated in architecture and design sessions, production on-call rotations, and frontend engineering interviews.

7. 1. Oct 2018 – Mar 2020

      Software Engineer

      accesso · Lake Mary, Florida

      Worked as a Backend Software Engineer developing cloud-native microservices supporting the TE2 Experience Engine, leveraging Java, Kotlin, Spring Boot, AWS, Kafka, PostgreSQL, and Couchbase.

      • Developed REST APIs and backend microservices using Spring Boot, Java, and Kotlin to support high-volume guest experience and ticketing platforms.
      • Designed and implemented data access layers using PostgreSQL and Couchbase, supporting transactional and NoSQL workloads.
      • Developed unit and integration tests using JUnit and Mockito to improve application reliability and maintainability.
      • Configured distributed application settings using Spring Cloud Config and automated service deployments through Jenkins pipelines written in Groovy.
      • Implemented Kafka producers and consumers to enable event-driven communication between microservices.
      • Assisted with deploying and supporting containerized microservices running on Kubernetes in AWS.
      • Troubleshot production and development issues, participated in monthly on-call rotations, and collaborated with cross-functional teams to maintain platform reliability.

8. 1. May 2018 – Oct 2018

      Software Engineer Intern

      Mobile-Vision · Greater Orlando

      Helped implement features for DES, a web application that runs on the local network of police department precincts storing photo evidence for law enforcement, utilizing Spring Framework and JSF.

      • Led migration effort to upgrade IceFaces from version 1.8 to version 3.
      • Implemented feature to send data over a network from one precinct to another.
      • Made UI component upgrades using JSF.
      • Participated in daily stand ups, design meetings, and other scrum related meetings.

9. 1. Jan 2017 – Oct 2018

      Software Developer

      Sigma Capital · Part-time, remote · Kissimmee, FL

• Qbon

  A storefront on every restaurant table.

  One QR code on the table opens the restaurant's own storefront in the phone browser, with no app to download. Owners update it from their phone and every table changes at once.

  • NestJS
  • TypeORM
  • PostgreSQL / PostGIS
  • Next.js
  • React
  • Expo / React Native
  • Nx
  qbonapp.com ↗

• Platealo

  Home cooking, shared with heart.

  A bilingual (English and Spanish) recipe home for Caribbean kitchens and curious cooks: save dishes, follow friends and pass family flavor forward.

  • NestJS
  • Flutter
  • Next.js
  • React (Vite)
  • Supabase
  • TypeORM
  • Nx
  platealo.com ↗

• RealDeed

  County tax-deed inventory, appraised and ready to review.

  A platform that pulls Florida county tax-deed auction listings, values each property and puts them in a dashboard for review. Orange County is live, and other Florida RealAuction counties share the same scrape path.

  • NestJS
  • React
  • Supabase
  • TypeORM
  • PostgreSQL
  • Nx

• Dentlify

  An MCP server that lets RetellAI agents schedule appointments in the Oryx Dental system.

  • MCP

• Azure Hotels

  Web presence for a luxury hospitality developer.

  Marketing sites for Azure Hotel Holdings, Azure Hotel International and the Azure Kissimmee boutique hotel, built and deployed from one Nx monorepo.

  • Next.js
  • TypeScript
  • Nx
  • Vercel
  azurehotelholdings.com ↗azurehotelinternational.com ↗azurehotelkissimmee.com ↗

• JYC Holdings

  The parent company behind the portfolio.

  JYC Holdings is the parent company for the products above. Brian builds and runs its engineering.

More projects

• Insidely

  Insider-trading activity from SEC filings, structured for analysis.

  A serverless platform that collects insider-trading activity from SEC filings. It automatically finds and parses insider transaction forms from the SEC website and structures the data for analysis.

  • NestJS backend and Angular frontend.
  • Authentication through AWS Cognito.
  • NestJS
  • Angular
  • Serverless
  • AWS Cognito

• CallPulse Pro

  Automated outbound calling that hands answered calls to a live agent.

  An automated outbound calling platform built as serverless microservices on AWS Lambda. It takes in leads from Facebook Ads, dials them through Twilio, and transfers only the calls that get answered to a live agent.

  • NestJS on AWS Lambda through a serverless adapter.
  • Authentication through AWS Cognito.
  • AWS Lambda
  • NestJS
  • Twilio
  • Facebook Ads lead feeds
  • AWS Cognito

• 

  University of Central Florida

  Bachelor's degree · Computer Science

  2016 – 2018

• 

  Valencia College

  Computer Science Articulate (UCF) · Computer Science

  2013 – 2016

English

Full professional proficiency

Spanish

Professional working proficiency

Languages

• Java
• Kotlin
• Python
• TypeScript
• Scala
• Groovy
• C
• C#
• Ruby
• Dart

Frameworks

• Spring
• Spring Boot
• WebFlux
• NestJS
• ExpressJS
• Flask
• Django
• Ruby on Rails

Protocols & API styles

• RESTful
• GraphQL
• MCP
• HTTP
• API Gateway

Eventing

• Kafka
• SNS
• SQS
• JMS

Logging & metrics

• Splunk
• CloudWatch
• Grafana
• OpenTelemetry (oTel)
• Mimir
• Tempo

Security

• OAuth 2.0

Databases

• PostgreSQL
• Oracle
• MySQL
• DynamoDB
• MongoDB
• Couchbase
• Redis
• SQLite
• Snowflake
• PostgreSQL (Supabase)

Caching

• Redis
• Memcache

Data

• Apache Airflow
• ETLs

Storage

• S3

Deployments

• Kubernetes
• ECS
• App Runner
• AWS Lambda
• Serverless Framework
• Render
• Heroku
• EC2