John Jacobs Email & Phone Number

Chicago, IL, US

Boca Raton, Florida, US

• Served as Lead Developer and Web Solutions Architect, spearheading the modernization of a single-page application (SPA) for a legacy colocation and cell tower leasing platform using Angular and ASP.NET Core.
• Led the refactoring and modernization initiative, significantly improving application stability and scalability by optimizing Entity Framework Core queries, resulting in dramatic performance improvements.
• Increased operational visibility by implementing Serilog and Application Insights for advanced logging and real-time analytics.
• Enhanced scalability and UI responsiveness by migrating critical workflows to Azure Web Jobs and Azure Functions, improving performance and user experience.Key contributor to the development of a greenfield cell tower.
• Architected the backend with a robust, scalable Onion Architecture, leveraging ASP.NET Core and Azure Cosmos DB for data management.
• Developed a rich and responsive UI using Angular 16, NgRx, and PrimeNG, delivering a seamless user experience for commercial real estate management.

• Enterprise HRM Solution (PTO Management System) (2022–2023 via LLC)
• Architected and developed a cloud-native HRM solution for managing paid time off, designed for small businesses, using ASP.NET Core and Blazor WebAssembly.
• Implemented a multi-tenant architecture with a sharded database approach, leveraging Azure Application Services, Azure SQL, Azure KeyVault, and Azure Functions.
• Built a customizable PTO policy management system with time accounting features for employee leave requests, following Clean Domain-Driven Design and CQRS principles.
• Extensively used Azure DevOps to create custom process types, highly customized boards, and optimized CI/CD pipelines for continuous integration and delivery.
• Created a Human Resources blog using Azure Static WebApps and the Statiq static site generator, with automated build and deployment pipelines via Azure DevOps.

Buffalo Grove, Illinois, US

• Led the development and architecture for a critical Kaizen initiative, building a sophisticated "smart" spreadsheet SPA from the ground up, streamlining customer onboarding, and enabling seamless data updates..
• Architected and developed the majority of the application, incorporating advanced data validation and error reporting to maintain high data quality standards.
• Configured a robust CI/CD pipeline and implemented CQRS to design the back-end API, ensuring scalability and reliability for future enhancements.Served as the Senior Full Stack Developer for a high-impact project aimed.
• Developed a microservices architecture with an Angular UI,.NET Web API, and RabbitMQ message processing, ensuring resilient message delivery using patterns like the message outbox and exponential back-off with circuit.
• Scenario Analysis Tool: Primary developer for a complex decision support tool enabling comparison of multiple award scenarios. Delivered high-quality code that has remained issue-free for over three years.
• Sourcing Planner: Built a configurable tool for planning and tracking sourcing events, increasing efficiency and cost savings.Developed a self-service reporting tool that transformed the Customer Success team's access.

Tarrytown, NY, US

• Spearheaded the development of a new data capability for downloading custom data sets and reports, delivering a highly praised solution that met customer demands. Took the initiative to design and implement the entire.
• Developed a custom API using ASP.NET Core, integrating advanced security configurations and deploying the solution to Azure with Azure API Management for secure access and scalability.
• Actively communicated with clients throughout the project lifecycle, providing training and support to ensure seamless adoption of the new data capabilities.
• Tackled complex challenges related to custom client data schemas by leveraging Reflection.Emit and advanced F# functional programming techniques, ensuring the solution's flexibility and performance.Independently.
• Solved a particularly challenging problem by combining F# functional programming with Entity Framework and custom SQL queries to dynamically query database schema information, streamlining the tenant management process.
• Built a web-accessible system that became a cornerstone of the company’s enterprise architecture, enabling the configuration and provisioning of customer information while supporting feature flagging for different.

Chicago, Illinois, US

• Delivered a highly customizable rewards program for targeted market segments, a foundational component of a broader system that enhanced the overall customer experience. Led full lifecycle development on the.NET stack.
• Conducted requirements sessions with the Rewards team to ensure alignment with business objectives and communicated the technical progress and vision throughout the development process.
• Developed the solution as a Windows service with a WPF desktop client, leveraging WPF's rich functionality to provide users with an interactive, multidimensional analysis experience.
• Managed complex, multi-layered data transformations, denormalizing and loading data into a data warehouse via an enterprise service bus (ESB) to ensure seamless data integration and reporting.Played a key role in.
• Solved a critical issue that threatened the website's launch, tracing through the code and conducting extensive performance testing to identify and resolve the root cause of a major bottleneck.
• Applied expertise in concurrent programming and writing thread-safe code to ensure the site's performance and stability under high user loads.

Zurich, CH

• Architected and developed proprietary fixed-income trading solutions on the.NET platform, playing a key role in optimizing pre-trade order handling workflows.
• Designed and implemented a multi-layer pre-trade order handling system, improving trade accuracy and speed for fixed-income products.
• Performed comprehensive data analytics and ETL processes to support real-time trading decisions and data-driven insights for the trading team.
• Provided ongoing support and enhancements to ensure system stability and compliance with evolving financial regulations.

• Led the development of reporting and business intelligence (BI) solutions on the Microsoft stack, ensuring robust data handling and reporting capabilities for key stakeholders.
• Architected, designed, and developed back-end systems using C# and the.NET API, enabling efficient data processing and reporting.
• Delivered high-impact BI solutions that improved data accessibility and insights for the organization, ensuring better decision-making and reporting accuracy.

Evanston, IL, US

• Spearheaded the architecture and development of an enterprise-level scheduling system using Quartz.NET and.NET, successfully replacing five outdated legacy systems.
• Designed and implemented the scheduling system to improve workflow automation and efficiency for property management operations.
• Delivered a scalable, high-performance solution that streamlined work order management across multiple properties, enhancing productivity and operational oversight.

Aberdeen, Scotland, GB

• Produced mission-critical collaboration solutions using C#, ASP.NET, and SharePoint.
• Spearheaded code migration from SP 2007 to SP 2010.
• Utilized advanced technologies including WCF, LINQ, multithreading, reflection, and SQL Server Reporting Services.
• Evangelized unit-testing best practices.

Hamburg, DE

• Engineered e-commerce solutions using JAVA, AJAX, SQL Server 2005, PostgreSQL, and cutting edge technology like Groovy, Grails and Hibernate.
• Worked extensively with SQL databases and back-end web technology.

• Developed applications to support trading operations using C#,.NET, WinForms, Remoting, and SQL Server 2005.
• Designed systems from scratch including database schema, implemented using C#,.NET, and SQL Server 2005.

Chicago, IL, US

• Developed both front-end and back-end web solutions using C#,.NET, ASP.NET, Remoting, XML, Web Services, and Flash interface.
• Designed systems from scratch including database schema, implemented using C#,.NET, and SQL Server 2005.
• Developed modules using C# to interface with hardware devices.

London, GB

• Programmed and deployed document creation and delivery solutions.
• Used object-oriented programming document markup to create professional forms and documents.

• Developed reporting tools, user desktop applications and MS Office enhancements.
• Used C#,.NET, VB 6 and VBA to build MS Office enhancements.
• Worked with SQL Server 2000 and document software like Crystal Reports.