Open to opportunities

Liang Sun

@liangsun

Message

Seasoned software engineer specializing in scalable microservices and cloud platforms.

Singapore

Message

What I'm looking for

I seek senior backend/cloud roles where I can lead engineering efforts, build scalable microservices, mentor teams, and deliver measurable performance and reliability gains.

I am a seasoned software engineer with 13+ years building high-scale microservices and cloud-native systems at major tech companies and startups. I design and implement resilient backend platforms using Python, Node.js and Go, optimize performance and costs, and lead engineering teams to deliver measurable business impact.

My experience spans payments, real-time analytics, and machine learning productionization where I've reduced latency, improved availability, and automated CI/CD across global systems. I mentor engineers, drive cross-functional collaboration, and focus on data-driven solutions that improve user experience and operational efficiency.

Experience

Work history, roles, and key accomplishments

Current

Software Engineer

Current

Google

Mar 2022 - Present (4 years 3 months)

Engineered scalable Python and Node.js microservices on GCP handling 100M+ daily transactions, reduced API latency by 30% and improved system reliability by 20% through CI/CD and architecture optimizations.

Python Node GCP Kubernetes Docker CI CD Redis BigQuery Pub Sub

Staff Software Engineer

Visa

Sep 2019 - Mar 2022 (2 years 6 months)

Led design and implementation of PCI-DSS-compliant payment microservices and resilient routing systems using Python and Kafka, achieving 99.95% availability and reducing vulnerabilities by 40%.

Python Kafka AWS Lambda Kubernetes ELK Fraud Detection Microservices CI CD

Software Engineer

Grab

Nov 2016 - Sep 2019 (2 years 10 months)

Built data pipelines and microservices on GCP using Spark, Airflow and Kubernetes; developed demand-forecasting ML models that improved availability by 15% and cut ETL time by 50%.

Python Apache Spark Airflow GCP Kubernetes Docker scikit learn Redis Microservices

Technical Lead

Mala Online

May 2015 - Nov 2016 (1 year 6 months)

Coordinated product, design and engineering to launch a Django marketplace on AWS, delivered 3 major releases and captured 15% market share while scaling to 100K+ daily active users.

Python Django AWS Terraform MongoDB Redis Jenkins Docker

Lead Software Engineer

Enjoy Study

Jul 2013 - Nov 2014 (1 year 4 months)

Led performance tuning of video streaming using FFmpeg and CloudFront increasing throughput 50% and built adaptive learning engine using scikit-learn raising engagement by 25%.

Python scikit learn FFMPEG Cloudfront Flask Redis GraphQL Automated Testing

Software Engineer

Douban

Nov 2012 - Jul 2013 (8 months)

Built unified profile API and improved moderation workflows with Celery and Redis, reducing API calls by 50% and increasing engagement by 30% through caching and recommendations.

Python Flask Celery Redis MySQL scikit learn API Design Caching Agile

Software Engineer

Hada Online

May 2011 - Jun 2012 (1 year 1 month)

Integrated third-party payment gateway and delivered modular CMS and RESTful APIs, increasing paid subscriptions by 15% and reducing onboarding/setup time by 80% via Docker.

Python Java Spring Boot Docker MySQL RESTful APIs AWS CI CD

Software Engineer

Neusoft

Jul 2010 - May 2011 (10 months)

Championed Agile adoption and improved system reliability with automated backups and reporting tools, reducing production defects by 40% and saving 10 hours/week via automation.