Curriculum Vitae

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General Information

• Full Name: Le-Hoang Tran
• Languages: Vietnamese (native), English (professional proficiency)

Education

• M.S. in Computer Science, George Mason University | Fairfax, VA, USA | 2027 (expected)
• B.S. in Information Technology, Hanoi University of Science and Technology | Hanoi, Vietnam | 2022
  • Excellence Degree (Top 5%) (5 years program)

Work experience

LINE Technology Vietnam - Backend Software Engineer

Hanoi, Vietnam | July 2025 – August 2025

• Researched a fault-tolerant online data migration solution for 10TB+ data from MySQL + Cassandra to a unified MySQL architecture using dual-write and backfill strategy.
• Leveraged AI-driven tools to automate unit/integration tests and preliminary code review, improving developer productivity for code implementation by 25%.

Viettel Digital - Backend Software Engineer

Hanoi, Vietnam | May 2021 – June 2025

• Customer Engagement Platform
  • Implemented an in-house marketing system that engages customers through personalized campaigns such as in-app/push notifications, gift/voucher distribution, delivering over 100M+ events to Viettel Money users daily.
  • Optimized segmentation creation throughput from 500 to 35,000 qps by applying Roaring Bitmap with effective caching strategies, which dramatically reduced service latency by 80%.
  • Implemented a rule evaluation workflow using Camunda BPM, making it configurable for non-technical users.
  • Led a team of 4 backend engineers; driving sprint planning, system design, and code reviews to continuously extend system functionalities, in reaction to meeting user needs and growing demands for performance and scalability.
  • Monitored system metrics via Grafana and proactively detect potential areas for performance improvement. Reported to relevant teams, applied multiple optimization techniques to implement those proposals, including configuration tuning, caching mechanisms, and microservices patterns.
• Smart Authentication System
  • Collaborated in researching and delivering SmartOTP solution to replace SMS OTPs for 20M+ users, saving over $200K annually and enhance authentication reliability.
  • Implemented a secure key exchange, OTP generation and digital signature mechanism across critical APIs.
  • Implemented security hardening techniques for Android apps including code obfuscation, root/jailbreak/tampering detection using native C and JNI, passed Viettel Group Information Security assessment.
• Data Tracking System
  • Designed and implemented a high-throughput user activity tracking system for mobile/web platforms, replacing Appsflyer licensing costs annually.
  • Implemented a CMS and online tracking rule configuration module supporting 3,000+ dynamic tracking rules.
  • Optimized rule validation engine by implementing a decision-tree based rule evaluator, reducing latency by 30% and improving data-capture throughput.
  • Implemented reactive data fetching APIs with Spring WebFlux to improve throughput and responsiveness, handling 150M+ events daily.
• User’s Contact System
  • Designed and implemented a backend module to collect and synchronize user contact data across devices for Viettel Money application, supporting 20M+ users.
  • Implemented Roaring Bitmap to store user contacts, optimizing storage usage by 70% and improve contact discovery throughput by 80%.

Technical Skills

• Programming Languages: Java, C, Python, JavaScript, SQL
• Backend: Spring Framework, Microservices, Apache Kafka, Camunda BPM, Caffeine, RESTful API, gRPC, JNI, Unit/Integration testing
• Databases: MariaDB/MySQL, MongoDB, Redis/Valkey, Elasticsearch, MinIO, ClickHouse
• Familiar: Docker, k8s, AWS, CI/CD, Jenkins, ELK Stack, Grafana, Keycloak, k6, SDLC

Publications

• Proposed Intelligent Decision Support System using Hedge Algebra integrated with Picture Fuzzy Relations for improvement of decision making in medical diagnoses
  • Hoang, T.L., Pham, H.V., Hung, N.Q. et al. Proposed Intelligent Decision Support System Using Hedge Algebra Integrated with Picture Fuzzy Relations for Improvement of Decision-Making in Medical Diagnoses. Int. J. Fuzzy Syst. 25, 3260–3270 (2023). https://doi.org/10.1007/s40815-023-01548-4

Certificates

• AWS Certified Solutions Architect – Associate - Issued Sep 2023
  Credential

• MongoDB Associate Developer - Issued Apr 2024
  Credential

• Oracle Certified Associate – Java SE 8 Programmer - Issued Apr 2023
  Credential

• Redis Certified Developer - Issued Dec 2021
  Credential

• English Test: TOEIC 955/990, IELTS 7.5 (Issued 2024)