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 site management system, delivering a comprehensive real estate management solution utilizing the latest Angular and Microsoft technologies. • 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.• Managed offshore developers for the landing page and executed marketing campaigns through Apollo.io to attract customers.Enterprise Algorithmic Trading System (Side Project via LLC)• Built a multi-paradigm (C# and F#) algorithmic trading system with a modular architecture of 64 .NET projects and ~100,000 lines of code.• Developed a WPF front end that communicates with a master service via WCF, handling complex workflows and trading algorithms.• Implemented self-modifying composite sequential workflows to support machine intelligence and decision-making algorithms.• Designed the system to automatically download, normalize, and insert global stock exchange data (end-of-day and 1-minute intervals) into a securities master database in under 20 minutes.• Utilized a wide range of technologies, including Quartz.NET, Log4Net, Entity Framework, TPL, Reactive Extensions (LINQ2Rx), WPF, and MS Unity.

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. Collaborated closely with product managers to ensure alignment with business needs and delivered under tight CEO-mandated deadlines.• 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 at enabling supply chain analytics with real-time product and cost comparisons, replacing error-prone manual processes. • 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 breaker. Made key contributions to a comprehensive sourcing solution, streamlining procurement processes and enhancing collaboration across the supply chain. • 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 to supply chain economic data, replacing a manual process with a scalable, 3-tier solution on the Microsoft Stack. • Architected a greenfield system with an ASP.NET Core back end and an Angular SPA, leveraging advanced Angular features like asynchronous Reactive Forms validation.

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 solution independently. • 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 transformed 100 highly customized customer databases into a unified, multi-tenant management system with a standardized schema, empowering leadership to better manage customer growth and feature deployment. • 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 customer groups.

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, from requirements gathering to deployment.• 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 modernizing a members-only website by integrating it with Adobe Experience Manager as part of a 3-member team. • 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.