Portfolio

SupplyManager Client Project

Description: B2B ecommerce system for medical purchasing
Technologies: Java 17, Spring Boot 2.x, Microservices
Infrastructure: AKS, Oracle, MS SQL, Redis, Kafka, Elastic, JDE, Concourse CI, Distributed Tracing
Background: SupplyManager, McKesson
Contributions:
- Migration from legacy monolith to modern microservices, refactoring and rebuilding of existing functionality, new feature work, customer migrations to updated system
- CSOS (controlled substances ordering system) integration with 3rd party vendor to allow ordering and digital signing for schedule 2 controlled substances
- Concourse CI resources and pipeline templating to support development and operational needs
- Extend internal microservices support library to improve distributed tracing, introduce micrometer metrics reporting. Spring extensions to handle cross-cutting concerns for apps and services - standard logging, security, authentication, caching, async functionality and config.
- Lead architecture and development for customer loyalty program, interfacing with marketing, legal, compliance, ERP, and data teams along 3rd party vendor. Negotiate with all parties to find a solution that satisfies unique regulatory constraints
- Migration from legacy self-hosted Endeca search to SaaS solution. Refactoring of search internal microservice in backwards compatible fashion to replace implementation while maintaining existing public API
- Troubleshoot and diagnose performance issues. Solve resource pooling bugs, cache timeliness and stability, N+1 communication patterns, production support

Timing & Scoring

Description: Middleware to interface with timing hardware, collect manage and export data, monitoring of hardware. Multiple hardware protocols, versions and capabilities supported and displayed in unified interface. Communications via local network, WAN via relay server, RS232, RS485, USB HID, text file import. Interfaces for import/export with MySQL, MS SQL, MS Access, ODBC, TCP stream, custom file format. Multi-user client/server handling with event streaming via Protocol Buffers. Embedded web app for optionally producing race results.
Technologies: Java, Guava, Joda Time, Swing, JavaFX, Protocol Buffers, Protostuff, Serialio
Infrastructure: H2, MySQL, MS SQL, MS Access, Excelsior JET (now launch4j), Jetty
Background: Timing & Scoring, MyLaps
Contributions: Introduction of client/server functionality, integration/interfacing race scoring module built by contracted firm, support for USB HID reader device, implement software controls to allow for pay per use business model for RFID tags, maintenance work removing unused code, refactoring for better maintainability and understanding, diagnoses and fixes for tricky thread safety issues, performance profiling and improvement

www.mtecresults.com

Description: Race results and rankings, personalized race video, custom generated PDF certificates, live results. 2010-present
Technologies: Grails, Groovy, GORM, Guava, JQuery
Infrastructure: CloudFront, S3, MySQL, ActiveMQ, EHCache, Elastic Beanstalk, STOMP, Quartz, Compass, Tomcat, SES
Background: www.mtecresults.com, Virtual Run Brochure August 2020: 3,502,137 individual participant results (1,730,507 unique participants), 13,884,586 individual times. 8.5M yearly page views (2019) 5.5M unique, peak daily page views: 500,000, peak hourly page views: 50,000

Shoutout Video

Description: Video submission and playback platform, online submission of encouragement videos for athletes on race course, triggered by RFID system as participant approaches video board, optional video switcher control via RS232
Technologies: Java, JavaFX, picocli, NanoHttpd, JMH, JQuery, videojs
Infrastructure: Lambda, S3, CloudFront, Elastic Transcoder
Background: Promo Video, Brochure, Video Submission Demo Released Fall 2019 at Columbus Marathon

Dynamic Assignment

Description: On site dynamic assignment of participant number. Allows for less waste of supplies vs. pre-assigning, faster/more flexible pickup experience for participant. Offline first system, must be reliable for good participant experience and with limited pickup window
Technologies: Java(Server), Android(Client), gRPC, Protocol Buffers, Dropwizard, JDBI, Lombok
Infrastructure: H2, Android POS terminals
Background: Developed winter 2019-2020 Screenshot

Selfie Clock

Hardware and software build of portable LED display for use as selfie background, running time clock. Android and desktop mangement apps. Custom built PCB to simulate reverse engineered keypad for existing clock to make it interoperable with same software.
Technologies: Java, Android, Protocol Buffers, Lombok
Infrastructure: Raspberry Pi, LED Matrix Hat, KiCad, ZeroTier, Table Saw, PVC, Spray Paint
Background: PCB Images 1.0, 1.1, 1.2

Internal Android Apps

Description: Internal Android apps for various functions - AnnouncerDisplay (tablet/desktop info display for race announcer, live results feed, gRPC integration for live updates/messaging from timing software) / ResultsReceipts (receipt printout of results from POS device, using internal API of www.mtecresults.com ) / BackupTiming (manual time capture for backup/verification uses, integration with external services with TCP and HTTP APIs) / ClockControl (control/monitoring of in house LED display and commercial LED clock with reverse engineered input) / S3PhotoSync (live sync of captured photos to S3 and metadata HTTP API)
Technologies: OkHttp, gRPC, Protocol Buffers, TrueTime Android
Infrastructure: S3, Lambda, ZeroTier

Media Reporting Site

Description: S3 directory listing with email/SMS notification to interested parties of updated files matching given regexp
Technologies: Node, Pug
Infrastructure: Serverless, S3, Lambda, SNS

Data Transformation

Description: Data transformation for common use cases, diff of CSV file based on unique id column. JSON DSL for data transformations. Splitting CSV on unique column values.
Technologies: Haskell, aeson, parsec, lucid, Groovy
Background: GitHub repos - DataLoader, CsvDiff, TeamSplitter

API clients - RaceEntry/RaceRoster/RunSignUp

Description: API clients to access registrations services via CLI or to embed as library
Technologies: OkHttp, picocli, Lombok, Gson
Background: GitHub repos - RaceEntry API Client, RunSignUp API Client

RS-Pretty

Description: Parse text report from 3rd party tool and build Latex template to generate more polished PDF report. Customizable config of reports and file watch for automatic regeneration
Technologies: Java, JSoup, Protocol Buffers, picocli
Infrastructure: Latex, launch4j

TCP protocol handling/conversion - Various tools (5+)

Description: Tooling for converting 3rd party TCP/UDP streams from custom protocol to Java API, DB or JMS handling, conversion to other 3rd party protocol
Technologies: Java, Mina, JMS
Infrastructure: Jitpack, ActiveMQ
Background: GitHub repos - MyLaps TCP Server, RM Timing UDP Server, rs-happy, RunScoreTCPToFile

Live Ranking

Description: Extending Order Statistic Tree implementation to allow for duplicate entries and keep proper count
Technologies: Java
Infrastructure: Jitpack, MySQL
Background - GitHub Repos - LiveRanking, OrderStatisticTree

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