Lorence Tsai

With a solid foundation of over 10 years as a Backend Developer, I am an effective team collaborator. I always engage in profound discussions with team members to set clear visions and objectives. My approach is pragmatic, advancing epics in phases toward the successful achievement of product development goals.

Domain : Social Media、E-Commerce、Large Distributed Systems

Phone : 0986810117 Email : [email protected]

Backend Skill

Lang

Golang (main)
Python
C#

Service

Elastic Search
EMQX
RabbitMQ
Redis-Cluster
K8s
Spanner
PubSub

Other

Embedding ( with Bert
Lambda
ETL
GraphQL
TDD
Drone
MySQL / MSSQL

About ME

System Design

Familiar with research and feasibility analysis, skilled in abstract design based on Clean Architecture, and proficient in using UML to reduce communication costs by 50%.

System Develop

Accurate time estimation ability of over 80%, familiar with MVP and POC with a keen ability to detect bad smell refactor them by Cursor, Twice as efficient as the average person.

Management

Familiar with cost control and team delivery by Scrum, set clear objectives then control burndown rate below the ideal line and keep the sprint fail rate under 20%.

Employment Career

Playsee, Social Media Team Leader Feb 2023 ~ Now

Led the team to complete an impossible mission within the deadline
Main technical: Go、GCP、Elastic Search、Neo4J、pub/sub、spanner

Led 6 backend to build a whole new distributed microservice system that hold capacity of 100,000 RPS with limited replicas.
Designed then built a chatbot service based on MQTT with a capacity of 1,000,000 connections and 10,000 messages per second that eventually went into production.
Redesign the architecture of recommendation system include data pipeline, aggregator concept to reduce costs by 40% per month.
Redesign algorithm of recommendation system to make non-realtime api become real-time, also improve api avg latency from 2 second to less than 0.5 seconds.
Successfully improved daily user session time by approximately 250%.
In a multi-language search context, enhanced accuracy and improved performance by 50%.
Designed and led 2 backend engineers to build a vector-based recommendation that eventually went into production.
Make sure that LLM and resource costs do not exceed the anticipated ACPU threshold.

Angelsctek, Team Leader Oct 2020 ~ Feb 2023

Built Infrastructure Architecture with Microservices and PCI DSS Security Authentication
Main technical: Go、Python、GCP、MySQL

Designed and led 3 backend to build a reward system based on RabbitMQ, capable of sending 1 million coupons in 1 minute that eventually went into production.
Led 2 backend to build PCI DSS env in 3 months.
Coordinated with 5 managers to build an agile culture using Scrum.
Implement artifact architecture within the CI/CD pipeline with drone reducing packaging and deployment time by over 90%.

91APP, Senior Backend Engineer May 2019 ~ Oct 2020

Developer with experience in high-load applications

Main technical: AWS、.NET Core、.NET MVC、Angular、Container.

Collaborate with facebook enginner to Integrate offline conversion service.
Created web APIs for offline and online data merging.
Developed bulk file import workflows.
Engineered and developed ETL workflows.
Engineered and developed a promotion system.

Tecyt, Engineer Nov 2015 ~ May 2019

Learned design pattern

Main technical: .NET MVC、MSSQL、jQuery.

Stationed at gamania, maintained streaming media(Coture) used WebSocket.
Stationed at gamania, maintained crowdfunding platform(WeBackers).