Dao Duc

TechSys

• Designed and delivered scalable web systems, APIs, and data platforms.
• Led teams of 5-10 contributors through architecture reviews, code reviews, roadmaps, and delivery quality.
• Established engineering practices for security, testing, CI/CD, observability, and incident response.
• Partnered with Product, Design, QA, Data, Security, and Operations from discovery through production.

Technical Lead · Full-stack

E-commerce / Retail

• Sustained 3,000 orders per hour during peak campaigns.
• Reduced checkout API p95 from 1.8 seconds to 420 ms.
• Reduced stock-drift incidents by 60% using reservations and reconciliation jobs.

Backend Lead

Fintech

• Reached 99.99% reconciliation accuracy.
• Reduced end-of-day reconciliation from three hours to 18 minutes.
• Recorded zero duplicate postings across more than 12 million retried requests.

Lead Full-stack Engineer

Logistics / Supply Chain

• Processed 8,000 location events per second.
• Reduced response time for at-risk shipments by 22%.
• Reduced average distance per delivery by 14%.

Senior Full-stack Engineer · Team Lead

HealthTech

• Handled 120,000 bookings in the first year.
• Reduced manual booking calls by 35%.
• Improved appointment attendance from 72% to 86%.

Software Engineering

GPA 3.2/4