J

Jonathan Barbalas

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Jessore, Bangladesh

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work
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  • Instacart
    Software Engineer
    Instacart
    Sep 2022 - Current (4 years)
    • Developed React-based interfaces for the cart, checkout, and delivery modules, improving user task flow completion rates by 28%. • Rewrote legacy ASP.NET APIs into modular .NET 8 microservices hosted on AWS Lambda and API Gateway, enhancing reliability under high load. • Introduced GraphQL endpoints for the cart system to streamline data fetches and reduce client-side complexity. • Built comprehensive unit and integration tests using NUnit and Moq, increasing test coverage from 60% to 90%. • Automated deployments via GitHub Actions and containerized services with Docker, reducing release times by 50%. • Implemented real-time order updates using WebSockets for delivery status, improving user engagement metrics. • Partnered with desi
  • Eversight
    Software Engineer
    Eversight
    Oct 2020 - Sep 2022 (2 years)
    • Engineered intelligent pricing UI components in React and Material UI for retailer-facing analytics dashboards. • Designed and implemented C# ASP.NET Core APIs to expose ML pricing insights and historical data. • Created real-time synchronization features using SignalR for collaborative pricing strategy development. • Refactored authentication flows with OAuth2.0 and JWT for improved security and single sign-on support. • Collaborated with DevOps to containerize backend services with Docker and deploy to ECS using Terraform. • Enhanced SQL Server stored procedures and indexing strategies, cutting load times on bulk data queries by 40%. • Led the effort to integrate Redis caching, eliminating 60% of redundant pricing calculations. •
  • C
    Software Engineer (Volunteer)
    COVID Alliance
    Apr 2020 - Jun 2020 (3 months)
    • Developed privacy-first contact tracing dashboards in React for municipal health departments. • Integrated CDC and WHO data into backend services to power real-time regional statistics. • Implemented mapping features with Leaflet.js and GeoJSON to visualize local outbreak heatmaps. • Collaborated with a distributed team of engineers, epidemiologists, and civic technologists on a unified platform. • Focused on secure data protocols and informed consent to preserve user privacy.
  • Capital One
    Sr. Software Engineer
    Capital One
    Apr 2019 - Oct 2020 (1 year 7 months)
    • Built and maintained React-based UIs for customer portals, integrated with .NET Core APIs supporting card features and fraud alerts. • Devised RESTful services for credit eligibility checks and real-time transaction visualizations. • Orchestrated multi-step form wizards and profile components using Formik and custom hooks, reducing support tickets by 20%. • Adopted CQRS and MediatR in .NET backend to separate read/write workloads for the account API layer. • Architected event-driven workflows using RabbitMQ to handle alerts and fraud detection pipelines. • Collaborated with the security team to enforce strict data access policies and enable robust logging for audits. • Led implementation of Jenkins CI/CD pipelines for React and .NE
  • CME Group
    Software Engineer
    CME Group
    Sep 2014 - Apr 2019 (4 years 8 months)
    • Built Angular-based trading interfaces integrated with real-time data from WebSocket feeds and REST APIs.