Available for new opportunities

William
Tsang

Senior Software Engineer

10+ years building resilient, high-performance systems. 5-year specialization in large-scale Elasticsearch infrastructure, distributed pipelines, and AI-augmented DevOps workflows.

View Experience Get In Touch
Search Infrastructure Platform Engineering AI Workflow Integration DevOps / SRE
01

About

I'm a Senior Software Engineer based in San Francisco with over a decade of experience building and scaling production systems. My deepest expertise is in large-scale Elasticsearch infrastructure — managing global cluster lifecycles, automating deployments, and optimizing distributed indexing pipelines.

Most recently at Zendesk (2015–2026), I evolved from a Web Applications Developer building customer-facing UI to a Search Infrastructure Engineer owning mission-critical systems globally. I thrive at the intersection of platform reliability and developer experience.

I'm actively integrating AI-driven workflows — Cursor, Claude Code, and MCP agents — into the development lifecycle to accelerate delivery and ops efficiency. Currently seeking my next challenge in DevOps, platform engineering, or search infrastructure.

$ whoami
william.tsang — senior-swe / search-infra
$ cat status.txt
open to: devops · platform-eng · search-infra
$ echo $LOCATION
San Francisco, CA
# Ready to ship
10+
Years Experience
5yr
Search Infra Focus
02

Tech Stack

// Languages
Python Ruby JavaScript HTML/CSS
// Databases & Tools
Elasticsearch PostgreSQL MySQL DynamoDB Aurora Redis Apache Airflow Nginx Cerebro
// Cloud & DevOps
AWS Kubernetes Terraform Chef CI/CD Spinnaker Datadog
// AI & Workflow
Claude Code Cursor MCP Agents JIRA Confluence
03

Experience

Zendesk
San Francisco, CA  ·  June 2015 – April 2026
Senior Software Engineer — Search Infrastructure
2021 – 2026
  • Global Elasticsearch lifecycle management using blue/green deployment strategies for zero-impact traffic cutover.
  • Automated cluster orchestration via a Python Falcon framework web app and Apache Airflow DAGs for complex task flows.
  • Parallelized distributed indexing pipelines — architected concurrent document processing jobs, significantly reducing cluster build times and cloud costs.
  • Role-based RBAC permissions for cluster builds, streamlining feature rollouts to GA and enhancing developer experience.
  • Chef cookbook maintenance for infrastructure immutability — strategic tagging and scripting for consistent, repeatable deployments.
  • Proactive incident management via daily health dashboard monitoring, precursor identification, and on-call escalation.
  • Security compliance via Wiz dashboard AMI vulnerability reviews and SLA/SLO adherence.
  • AI agent integration (Cursor, Claude Code, MCP skills) into the full feature development lifecycle for accelerated throughput.
  • Documentation standards — infrastructure design docs, microservice architecture specs, and incident runbooks.
Senior Platform Services Engineer
2018 – 2021
  • End-to-end data migration tooling — evolved scripts into a robust web application with persistent database storage.
  • Metadata and full-instance copy services developed with cross-functional teams, driving additional departmental revenue.
  • Complex customer go-live migrations with strict data integrity requirements and minimal downtime SLAs.
  • Multi-threaded migration pipelines to scale throughput and meet customer timelines.
  • Tackled undiscovered product areas to retain at-risk and churning customers.
Web Applications Developer
2015 – 2018
  • Designed and developed user-facing components for the customer Help Center, improving UI/UX and CSAT scores.
  • Partnered with designers and stakeholders to ship MVPs to production-ready products.
Uniquify
San Jose, CA  ·  January 2013 – September 2014
ASIC Physical Design Engineer
2013 – 2014
  • Optimized block-level layered metal routing for clock tree synthesis and timing targets.
  • Verified DRC and LVS sign-off during project tape-out periods.
Revel Systems
San Francisco, CA  ·  February 2012 – December 2012
Technical Support Engineer
2012
  • On-site client launches for seamless support experiences.
  • Networking and TCP/IP troubleshooting on field devices.
04

Projects

Project In Progress
In Progress

Something is brewing. Details coming soon.

TBD
05

Education

2011
B.S. Electrical Engineering
San Francisco State University
Concentration in ASIC Design. Strong foundation in circuits, digital systems, and low-level hardware engineering.
2015
Software Engineering Bootcamp
Dev Bootcamp
Intensive 19-week program covering core programming concepts, web development, pair programming, and engineering empathy.
06

Contact

Let's build something.

Open to DevOps, platform engineering, and search infrastructure roles. Based in San Francisco — remote-friendly.

will.ktsang@gmail.com 415-275-1437 github.com/williamtsang9