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I am an experienced Software Engineer with over a decade of expertise in building high-performance applications and enterprise solutions using Django and React. I excel at transforming complex challenges into scalable, impactful results while fostering collaborative, growth-driven teams. I am committed to innovation, performance optimization, and delivering quality-driven outcomes. Throughout my career, I have designed and implemented robust, scalable software solutions for major companies like Walmart and IBM, focusing on backend and frontend development, API integrations, and asynchronous systems. I am passionate about software quality, security, and enhancing user experience through cutting-edge technologies.…I am an experienced Software Engineer with over a decade of expertise in building high-performance applications and enterprise solutions using Django and React. I excel at transforming complex challenges into scalable, impactful results while fostering collaborative, growth-driven teams. I am committed to innovation, performance optimization, and delivering quality-driven outcomes. Throughout my career, I have designed and implemented robust, scalable software solutions for major companies like Walmart and IBM, focusing on backend and frontend development, API integrations, and asynchronous systems. I am passionate about software quality, security, and enhancing user experience through cutting-edge technologies.

Robert Cresta

Full Stack Developer, Developer, Programmer, +1

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I am an experienced Software Engineer with over a decade of expertise in building high-performance applications and enterprise solutions using Django and React. I excel at transforming complex challenges into scalable, impactful results while fostering collaborative, growth-driven teams. I am committed to innovation, performance optimization, and delivering quality-driven outcomes. Throughout my career, I have designed and implemented robust, scalable software solutions for major companies like Walmart and IBM, focusing on backend and frontend development, API integrations, and asynchronous systems. I am passionate about software quality, security, and enhancing user experience through cutting-edge technologies.…I am an experienced Software Engineer with over a decade of expertise in building high-performance applications and enterprise solutions using Django and React. I excel at transforming complex challenges into scalable, impactful results while fostering collaborative, growth-driven teams. I am committed to innovation, performance optimization, and delivering quality-driven outcomes. Throughout my career, I have designed and implemented robust, scalable software solutions for major companies like Walmart and IBM, focusing on backend and frontend development, API integrations, and asynchronous systems. I am passionate about software quality, security, and enhancing user experience through cutting-edge technologies.

Available to hire

I am an experienced Software Engineer with over a decade of expertise in building high-performance applications and enterprise solutions using Django and React. I excel at transforming complex challenges into scalable, impactful results while fostering collaborative, growth-driven teams. I am committed to innovation, performance optimization, and delivering quality-driven outcomes.

Throughout my career, I have designed and implemented robust, scalable software solutions for major companies like Walmart and IBM, focusing on backend and frontend development, API integrations, and asynchronous systems. I am passionate about software quality, security, and enhancing user experience through cutting-edge technologies.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Work Experience

Senior Software Engineer at Walmart

January 1, 2022 - Present

Developed Django-based idempotent payment gateway integrations using Stripe API and Braintree, ensuring atomic transaction handling with PostgreSQL select_for_update to prevent double-charging in high-concurrency e-commerce workflows. Implemented React-powered dynamic product customization interfaces with WebGL for 3D rendering and Redux-Saga for asynchronous input validation. Enhanced inventory reservation systems with RabbitMQ event-driven architecture reducing overselling risks during flash sales through eventual consistency. Refactored legacy coupon logic using Django Q asynchronous batch processing aligning discount rules with GDPR data policies. Integrated Elasticsearch with Django Haystack for real-time faceted, fuzzy, and synonym-based product search across 20M+ SKUs.

Senior Software Engineer at IBM

December 1, 2021 - September 3, 2025

Built HIPAA-compliant patient portal modules using Django REST Framework with JWT authentication and AES-256 encrypted audit trails for PHI access. Created React-based clinical trial management dashboards with D3.js visualizations, RBAC, and real-time WebSocket-enabled adverse event reporting. Optimized Oracle PL/SQL-to-Django ORM migration pipelines via Apache Airflow, cutting data validation errors by 82%. Designed Celery-powered asynchronous PDF billing report generation compliant with WCAG 2.1. Resolved race conditions in pharmacy inventory APIs using Redis Distributed Locks ensuring ACID compliance for concurrent prescription fulfillment.

Full Stack Developer at Codal

October 1, 2017 - September 3, 2025

Delivered Django-driven B2B procurement platforms with Django Channels and WebSocket STOMP protocol for real-time commodity trading bid/ask negotiations. Engineered React-based drag-and-drop CMS editors with Draft.js and implemented Slate.js-like collaborative editing via operational transformation conflict resolution. Automated GDPR-compliant user data anonymization using Python Faker, Django Signals, and cron-scheduled Celery batch jobs. Debugged React SPA memory leaks using Chrome DevTools heap snapshots and optimized virtualized lists with React-Window. Secured Django Admin interfaces with Two-Factor Authentication, IP whitelisting, and Fail2Ban brute-force attack mitigation.