Flutter developer on a native banking app, deployed natively to iOS and Android app stores. Mostly frontend Flutter / Dart / Kotlin / Swift — with a little backend C# / .NET too. Driving accelerated timelines and increasing story point throughput for our blended contractor and full timer team.

- Full-stack AWS Web Development consultant- Tech Leadership as-a-serviceFrontend - Typescript, Javascript, React, Vue, JamstackBackend - Node, Java, Kotlin, Kafka, REST & GraphQL APIsServerless - AWS, Lambda, S3, API Gateway, Dynamo & Aurora DBs

Dec 2022 - AWS Certified Developer AssociateOct 2022 - Confluent Certified Kafka DeveloperMar 2021 - Alexa lunch menu skill - https://github.com/jeffsheets/alexa-papio-lunch-menuJune 2019 - Contributed Spring JPA StoredProcedure code - https://github.com/spring-projects/spring-data-jpa/pull/297Sept 2018 - Micronaut Java w/ Vue tech talk presentation https://jeffsheets.github.io/aws-vue/#/May 2017 - Nebraska.Code() Conference workshop presenter - Fundamentals of React & Redux - https://nebraskacode.amegala.com/Speakers/130May 2017 - Nebraska.Code() Conference speaker - Multi-Tenant Apps with Spring Boot - https://jeffsheets.github.io/spring-boot-multitenant/Oct 2016 - Omaha Java Users Group speaker - Why Kotlin? - https://github.com/jeffsheets/kotlin-gradle-groovyAug 2016 - NEJSConf conference volunteerAug 2015 - NEJSConf conference volunteerMar 2015 - NebraskaCode Conference speaker - Buzzworthy Java with JHipster and Spring Boot - http://jeffsheets.github.io/BuzzworthyJava/Dec 2014 - Central Iowa Java Users Group (Des Moines) speaker - Buzzworthy Java with JHipster and Spring BootDec 2014 - Lead AngularJS Training at Blue Cross Blue Shield of NebraskaNov 2014 - Lead AngularJS Training at Union Pacific RailroadOct 2014 - Omaha Java Users Group speaker - Buzzworthy Java with JHipster and Spring Boot - https://www.youtube.com/watch?v=yoEcBGxcRwUJul 2014 - Gr8Conf US Conference - Grails Workshop presenterJun 2014 - Presented "Testing Java Code in 2014" at Mutual of Omaha BITS Conference - http://jeffsheets.github.io/BITSConfJavaTesting2014/Spring 2014 - AIM CoderDojo's and InfoTec Conf - Mentor children learning Scratch programmingJan 2014 - Contributed Groovy SQL stored procedure enhancement to Groovy CoreJan 2014 - Instructor for Grails and Groovy Training class with 12 students over 3 daysAug 2013 - Presented "Testing Java Code in 2013" to Omaha Java Users Group

- Develop features for a Margin Rate Calculator for CrossMed's traveling nurse staffing organization- Elixir w/ Phoenix LiveView tech stack- Deployments to Gigalixir- Integrations with Bullhorn via custom tabs, action menus, and API calls

- Rewrite of legacy Commercial Card frontend into React + Kotlin APIs- React utilizing single-spa framework for microfrontends- Kotlin w/ Spring Boot Reactive backend

- Maintenance and features on multiple applications supporting Margin Rate Calculations for Triage's nurse staffing agency- Fullstack backend in Python Django w/ Postgres DB- DevOps pipeline deployments with Github Actions and Heroku- Maintained a separate frontend in Flutter w/ Dart- Data interfaces with Snowflake and Kamana APIs- Setup pytest unit tests with mock responses

Became Improving when Object Partners was acquired (after 9+ years with OPI)Java / Groovy / Kotlin / JavaScript / Node.js / AWS Lambda / React / Vue / Spring BootAlong with working full-time on client projects, I'm also responsible for guiding the internal OPI & Improving technology teams to shape our future development ventures.Strong software development skills across entire stack in Java, Groovy, Javascript, AWS Serverless, Grails, Spring, SQL, and REST Web Services

Lead React Dev on 2D Customization project (6/2021 - 6/2022)- Visual UI on Fabric.js Canvas to select fonts, texts, colors, sizes, images, to customize products like socks and mugs with pet photos- Integration into core Chewy website and across multiple micro-ui frontends (PDP, Cart, Checkout, Orders)- Test coverage with React Testing Library- Backend in AWS based Serverless stack (Lambda, SNS/SQS, Terraform, Akamai)- Completed and successfully launched in time for Black FridaySr Developer on Fresh Autoship projects with high visibility within organization (3/2021 - 6/2021)- Vue JS frontend components- Kotlin backend APIs- gRPC Protobuf backend API definitions

- Tech Lead for Spring Boot API services team- Implementing and architecting new services and tables to replace 20+ yr old legacy mainframe Claims system- Using Java, in Docker containers on OpenShift Kubernetes, with Splunk logs and Grafana monitoring- Created Kafka messaging layer for CDC database table replication from MySQL to mainframe DB copies, including producer and consumer sides- Utilizing Retrofit library for Web Service calls, including OAuth2 security

Java / Groovy / JavaScript / Node.js / AWS Lambda / React / Spring Boot / HibernateAlong with working full-time on client projects, I'm also responsible for guiding the internal OPI technology teams to shape our future development ventures.Strong software development skills across entire stack in Java, Groovy, Javascript, AWS Serverless, Grails, Spring, SQL, and REST Web Services

- Creation of new company from ground up, including Gitlab setup, AWS Cloudfront hosting for React, complete Serverless Lambda backend- Tech Lead for UI team, but also developed backend services- React project using Create React App, Material UI, Hooks, AmplifyJS- API design and documentation with Swagger, and built a custom auto-publishing documentation system with Gitlab- Using AWS Lambdas, DynamoDB, Cognito, Cloudwatch, DataDog, among others- Setup CI/CD build and deployment scripts, including automated Release-Manager Gitlab->Jira integration

Lead the Node backend and EmberJS fronted end development for the Impact Foundation's Giving Hearts Day campaign - that raises over $10M annually on a single day for the charities and community of Fargo.https://givingheartsday.org/- Implemented features and fixed bugs across a legacy NodeJS application- Developed integration of Auth0 identity management to backend Node APIs and Ember frontend- Debugging and modifying calls to Stripe API for payments processing- Acted as Postgres database admin by modifying schemas as needed for new features- Implemented Email messaging with the Amazon AWS SES service and library- Provided application security analysis of the entire REST api, including a ranking of priority issues- Added many Node unit tests using Sinon, Chai, Proxyquire, and Supertest for integration tests- Handled DevOps deployment tasks via GitHub, CircleCI, and Heroku

Lead the prototype and conversion project onto React from a legacy client JS framework- Grails 3 (Java) Upgrade code- Lead React project creation- Provided React training to the team- Guided AWS architecture for hosting purposes

Solution Lead for Sr Health - Lead technical architect for team tasked with supporting multiple Sr Health initiatives - API Modernization with Spring Boot + Consul microservice architecture - Implement OAuth 2.0 authorization server, including JWT tokens - Rewrite of Customer Access frontend to React + Redux from GWT - in short timeline with no large defects

Lead team of 12 developers to create Engagement Manager medical contracting system, for client to sell and market to global customer baseDeveloped key architecture pieces including Multi-tenant hibernate schemas, and Auth0 user role permissionsDaily development on Groovy + Spring Boot backend, with React/Redux frontend bundled with WebpackCore leader of full process from requirements estimates, initial tech stack creation, resource and release planning, demos, and deploymentsTools Used: Groovy, Spring Boot, React, Redux, Webpack, Spock, Karma, Auth0

Lead developer and architect on AngularJS + Bootstrap + Spring + Hibernate application to rewrite and modernize an aging Smalltalk application with a REST Services based architecture. Utilizing test-driven development with Groovy Spock, Protractor, and Karma Jasmine tests. This system is used to Nominate and Confirm natural gas quantities for distribution on the Northern Natural Gas transportation pipeline.- Initial project setup of AngularJS build environment with Node NPM, Grunt, and Bower- REST service interface using Spring MVC in front of Spring Data JPA repositories- Extensive AngularJS testing with Karma unit tests and Protractor end-to-end specificationsTools Used: AngularJS, Java, Spring MVC REST, Spring Data JPA, Spock, Groovy, Karma, Jasmine, Protractor

Grails Developer on various internal and external Groovy projects - Developed Grails application to query and chart health and life policy data from mainframe DB2 stored procedures - Grails Product Owner - responsible for Grails tools and usage guidelines for the enterprise - Improved throughput from 2k to 40k emails per hour for a Java Web Service responsible for sending agent emails - Promoted unit and integration testing practices with SpockTools Used: Grails, Groovy, Spock, JavaScript, Java, REST Web Services, SQL Server, DB2

Senior developer for rewrite of legacy fat-client application into a modern website on a HTML/Javascript/Java/Spring/Hibernate platform. This application is critical for tracking legal entity and gas pipeline point information for the corporation. - Architected modern Spring 3 web framework to update the legacy Spring 2 software stack that was previously in use. Including Autowiring, Annotation Validations, and CSS based styles - Deployed project to production 8 months ahead of schedule - Code was fully unit tested using JUnit and Mockito, along with functional tests for Hibernate queries - Implemented NNG's first REST web service client w/ Spring RestTemplate and Async calls - CSS and Javascript including full CSS Menus, jQuery Colorbox, Datatables with JSON, and AJAX - Email template Velocity framework, with custom whitelisting capability for pre-prod environments

Senior Developer and Architect for USSTRATCOM ISPAN strategic planning system. - Develop software enhancements and fix software defects for a Portal-based Spring MVC and JPA/Hibernate backed collaborative briefing application for global strategic adaptive planning. - Mission critical system that briefs high ranking officials, including Secretary of Defense, Joint Chiefs of Staff, and Commander of USSTRATCOM - Primary Technical Contact for Java architectural integration of DARPA and AFRL lab projects - Performance improvement initiative analyzed with Dynatrace & YSlow. Reduced page load times, javascript execution times, and java logic times. Improved site caching strategy via smart Apache rules - Development Lead for 14 developers to improve Online Briefings, and GWT Mapping features: responsible for code quality, peer reviews, and tasking deadlines - Created a security credential filtering plugin for chat portlet using Java, JSP, and Javascript - Developed dynamic client Ext JS and AJAX interfaces in Commanders Decision Aid for briefing to President, Secretary of Defense, and Commander of USSTRATCOMTools Used: Java, JSP, HTML, JS, CSS, JQuery, Spring, JPA, Hibernate, Eclipse, WebLogic, Oracle DB, Oracle ESB, Maven, JIRA, Crucible, Hudson, SVN

System developer and architect for web-based Spectrum workforce management and call forecasting application.Tools Used: AJAX, DWR, Eclipse, Weblogic, Struts/JSP, Ant, Selenium, Mac OS X

Lead Web Developer for JET weather portal project for the Air Force Weather Agency. - Developed architectural design and build structure for web tier - Lead designer and developer of presentation tier prototype in Struts, Jetspeed, and Javascript

- Lead designer and developer of presentation layer for enterprise security app- Maintained multiple business critical MyUPRR external facing website applicationsTools Used: J2EE, JSP/Struts, Ant, LDAP, JMS, C++, JavaScript, HTML, CSS