Aaron Yu

Software Engineer

Sift

Jun 2026 - Current (5 months)

Backend Software Engineer

Walmart Global Tech

Apr 2025 - May 2026 (1 year 2 months)

Fulfillment Services Platform (Global E-commerce)
• Built and enhanced Java/Spring Boot microservices and REST/GraphQL APIs for a high-traffic fulfillment platform supporting seller onboarding, inventory, lane routing, and shipping-label workflows
• Resolved a production issue blocking shipping-label generation for some sellers by tracing the workflow end to end, identifying missing upstream data, and adding a backward-compatible versioned API path
• Consolidated overlapping lane-configuration endpoints into a backward-compatible versioned API, reducing maintenance overhead by ~40% and improving downstream reliability
• Optimized service performance using JMeter load testing, JVM profiling, and SQL analysis; sustained p5

Full-Stack Engineer / AI Engineer Intern

Reality AI Lab

Jun 2024 - Aug 2024 (3 months)

AI Coach Platform
• Built Node.js/TypeScript backend services and secure APIs for an AI-driven chat platform, supporting group formation, application processing, and matchmaking workflows
• Integrated LLM-powered outputs into matchmaking workflows with prompt iteration, output validation, and rule-based fallbacks to improve quality and stability
• Improved data-processing performance with batched writes, composite indexes, and async execution, increasing throughput and reducing end-to-end matchmaking latency by ~25%
• Developed responsive React/TypeScript user-facing workflows for application intake, group formation, and matchmaking review
• Deployed backend and frontend components in a GCP/Firebase environment and

S

Software Engineer

Feb 2022 - May 2024 (2 years 4 months)

Real-Time Collaboration Platform
• Built Java/Spring Boot microservices and a real-time synchronization layer for session, track, and playback control using WebSocket and Kafka
• Implemented Redis/PostgreSQL-backed state management and ordered event-driven updates to support high-concurrency collaboration workflows
• Developed an internal Angular admin dashboard for session/playback control, real-time monitoring, and operational workflows
• Supported Jenkins, Docker, and AWS EKS deployment pipelines with health checks, rollback mechanisms, Prometheus/Grafana dashboards, and centralized ELK logging

S

Software Engineer

Sep 2020 - Dec 2021 (1 year 4 months)

Core Banking & Data Platform Modernization
• Built Java 11/Spring Boot microservices for core banking workflows, including account, transaction, and internal data services
• Designed and optimized REST APIs with JPA/Hibernate and PostgreSQL, improving maintainability, scalability, and response-time performance
• Implemented Spring Security and OAuth 2.0 authorization flows with stronger validation, exception handling, and backend reliability safeguards
• Supported Docker/Kubernetes deployments and Jenkins CI/CD pipelines, contributing to safer releases, health checks, and rollback workflows
• Contributed to adjacent data and internal platform features using Python/FastAPI, Kafka, React, and automated testing

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Aaron Yu

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Behavioral traits