Trace skill to evidence.

A small, highly available K3s environment running on a Proxmox bare-metal laptop cluster.

• Automated a three-node HA K3s cluster with Ansible.
• Configured Cloudflare dynamic DNS and remote VS Code tunneling.
• Use the lab as a safe place to learn infrastructure by operating it.

A football ticket marketplace.

• Established safe database transaction and raw SQL patterns.
• Refactored and tuned SQL queries with targeted index hints.
• Reduced a stream processing workload from 1 GB to 200 MB using AsyncGenerator.

An international event ticket marketplace.

• Owned the technical and partner communication for a new ticket affiliate integration.
• Troubleshot and hotfixed production services with AWS CloudWatch.
• Integrated MaxMind minFraud and introduced stale-while-revalidate caching.

An observability-focused, event-driven web crawling platform.

• Provisioned AWS infrastructure with Terraform and Ansible, then bootstrapped self-managed K3s with Rancher and Helm.
• Migrated to EKS with cluster autoscaling and RabbitMQ-driven external metrics.
• Correlated logs, traces, and metrics with OpenTelemetry, Loki, Tempo, and Prometheus.

A graphic resource management system built with overseas teams.

• Set up a backend monorepo around Clean Architecture.
• Reviewed backend work and collaborated on schema design and migrations.
• Analyzed frontend issues and coordinated backend tasks.

A large-scale distributed crawling system with 800 worker instances.

• Reduced deployment cost by 60% with fault-tolerant workloads on AWS ECS.
• Autoscaled workers using custom AWS CloudWatch metrics.
• Improved throughput and memory use with streaming and micro-batching.

An NLP pipeline for Excel input with analytical charts and graphs.

• Implemented the NLP data processing pipeline.
• Integrated proprietary OAuth 2.0 authorization code SSO.
• Created a containerized local workflow with Docker Compose.

A multi-tenant laboratory workflow system delivered as a solo full-stack engagement.

• Translated detailed requirements directly with the client.
• Deployed a secure, highly available platform onto four empty Ubuntu VMs.
• Evolved the architecture from single-host PM2 to Docker, then a three-node Kubernetes cluster with Contour Ingress, and finally four nodes with Envoy Gateway.