Lefan's Portfolio

Favorite Projects

Below are some of my personal interests that I enjoy doing in my free time. Although not everything is listed here, but it does highlight some of my personal favorites.


Stable Diffusion

Taylor swift image generator. Trained LORA adapter for stablediffusion-XL using AWS GPU instance

Stable Diffusion

Experience Tree

Work experience grouped by the kinds of systems I like building.

Robotics, platform engineering, reliability, and internal tooling work across internships where I shipped production systems and made complex workflows faster for other teams.

Overview

Career Journey

A focused timeline across 4 engineering roles spanning robotics, platform reliability, and developer productivity.

2023 - 20253 branches4 experiences

Branch

Robotics and Automation

2025

Applied ML, deployment, and cross-team enablement for physical systems

RoboticsMLAWS

Amazon Robotics

Software Developer, AR Human Workcell Interface Team

Toronto, ON

Sept. 2025 - Dec. 2025
Planning PipelinesCDKWorkcells
  • Designed, developed, and deployed ML planning pipelines for robotic movement drive units across fulfillment centers worldwide.
  • Led a cross-team effort for work-cell station setup in Toronto, creating a path for teams to test workflows locally instead of relying only on Boston.
  • Deployed a custom CDK-managed application for robotic station software to connect to AWS from the Unfabric office network.

Branch

Platform and Security

2023 - 2025

Reliability, compliance, and operational tooling at service scale

InfrastructureMonitoringCompliance

Adentro

DevOps Engineer, Security and DevOps Team

San Francisco, California

May 2025 - Aug. 2025
ECSObservabilitySOC 2
  • Developed and maintained resilient monitoring systems for large-scale ECS clusters supporting 400+ services.
  • Led system design improvements adopted cluster-wide, speeding up configuration change workflows by 80%.
  • Contributed targeted infrastructure changes that supported SOC 2 compliance efforts across multiple services.

TELUS

Software Developer, RCOE Team

Toronto, ON

May 2023 - Aug. 2023
Spring BootDockerGCP Pub/Sub
  • Contributed to ACMP, an auto-call management service for automatic dispatching of field technicians.
  • Built, tested, and deployed production images of the ACMP service to customer-facing Docker swarms.
  • Adopted a GCP Pub/Sub model to facilitate secure communication and enable internal database access through Google services.
  • Developed a Java Spring Boot chat service with a serverless architecture, reducing compute cost by 20x.

Branch

Developer Productivity

2024

Internal tooling, diagnostics, and faster workflows for engineering teams

Internal ToolsSplunkAutomation

CIENA Corporation

Software Developer, Technological Innovation Team

Ottawa, ON

Jan. 2024 - Apr. 2024
JupyterLabSplunkDiagnostics
  • Developed major releases of a data aggregator tool used by hundreds of engineers within CIENA.
  • Built Splunk search queries that identified common hardware device errors 80% faster.
  • Used JupyterLab to automate complex log archive workflows, increasing efficiency by 30%.

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Easy - beats 0%

Medium - beats 0%

Hard - beats 0%

Recent AC


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Submission Calendar

View some of my favorite problems here

Contact Me

Please feel free to reach out to me for any questions!