Senior Full-Stack & DevOps engineer for small production systems I am a senior full-stack and DevOps engineer with about ten years of equivalent experience, an independent contractor based in China. I work remotely, with overlap for Asia and Europe mornings and US evenings by arrangement. I ship small production systems: Docker Compose or a native Linux process, nginx, GitHub Actions, backups, monitoring and alerting, and APIs or n8n-style automation in Python, JavaScript, and TypeScript. Five demos are live at _Website not available. Sign in: https://www.twine.net/signup_ StackPilot shows health and backups. FlowRelay validates and routes a webhook. PulseBoard shows uptime and error budget. HardenKit shows a fictional fleet before and after a playbook; live self-audit is off on that server. ShipLane shows a simulated blue/green pipeline and DORA figures from that history. Demo names are fictional. I do not invent clients, reviews, or metrics.…

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Senior Full-Stack & DevOps engineer for small production systems I am a senior full-stack and DevOps engineer with about ten years of equivalent experience, an independent contractor based in China. I work remotely, with overlap for Asia and Europe mornings and US evenings by arrangement. I ship small production systems: Docker Compose or a native Linux process, nginx, GitHub Actions, backups, monitoring and alerting, and APIs or n8n-style automation in Python, JavaScript, and TypeScript. Five demos are live at _Website not available. Sign in: https://www.twine.net/signup_ StackPilot shows health and backups. FlowRelay validates and routes a webhook. PulseBoard shows uptime and error budget. HardenKit shows a fictional fleet before and after a playbook; live self-audit is off on that server. ShipLane shows a simulated blue/green pipeline and DORA figures from that history. Demo names are fictional. I do not invent clients, reviews, or metrics.…

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Senior Full-Stack & DevOps engineer for small production systems

I am a senior full-stack and DevOps engineer with about ten years of equivalent experience, an independent contractor based in China. I work remotely, with overlap for Asia and Europe mornings and US evenings by arrangement. I ship small production systems: Docker Compose or a native Linux process, nginx, GitHub Actions, backups, monitoring and alerting, and APIs or n8n-style automation in Python, JavaScript, and TypeScript.

Five demos are live at Website not available. Sign in: https://www.twine.net/signup StackPilot shows health and backups. FlowRelay validates and routes a webhook. PulseBoard shows uptime and error budget. HardenKit shows a fictional fleet before and after a playbook; live self-audit is off on that server. ShipLane shows a simulated blue/green pipeline and DORA figures from that history. Demo names are fictional. I do not invent clients, reviews, or metrics.

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    ShipLane: release pipeline with blue/green and a job log
    A release story in a README does not show which job failed, which color is live, or how often a deploy rolls back. ShipLane is a visualizer for a fictional Globex checkout-api: build, a Python test matrix, scan, staging, approval, blue/green, verify, and rollback. The repository also holds real GitHub Actions workflows and a dry-run switch script. The page computes DORA numbers from the release log. Nothing is pushed to a real registry. Live demo: https://www.twine.net/signin Case study: https://www.twine.net/signin Stack: Python, FastAPI, GitHub Actions, Docker, nginx…
    HardenKit: Linux VPS baseline and audit reports
    A fresh VPS still had password SSH, no firewall, and a checklist that lived in a ticket. I wrote one Ansible playbook (SSH, firewall, fail2ban, unattended updates, sysctl, auditd, accounts, time sync) and a read-only audit script. The live page shows six fictional hosts before and after that baseline, with the role that fixes each open control. The public demo does not audit the server it runs on. Run the script on a host you administer. Live demo: https://www.twine.net/signin Case study: https://www.twine.net/signin Stack: Ansible, Linux, Bash, Python, FastAPI…
    PulseBoard: uptime, latency, and error budget
    A handful of services had no single place for uptime, latency, and remaining error budget. PulseBoard probes a fixed catalog: real HTTP checks of the sibling demos, plus clearly labelled simulated services with a short weekly incident script. The page shows a 7-day status bar, a latency chart, a healthy error budget, and an incident timeline. Alerts move pending, firing, resolved. Notifications are simulated and are not sent. Live demo: https://www.twine.net/signin Case study: https://www.twine.net/signin Stack: Python, Monitoring, Prometheus, FastAPI, SQLite…
    FlowRelay: webhook lead routing with a step log
    Lead webhooks fail open, create duplicates, and mix support complaints with hot sales leads. FlowRelay accepts the POST, returns a run id, then validates, dedupes on email plus UTC day, retries a flaky enrich step, scores, and routes to sales, nurture, or support. The page shows every step plus a simulated Slack, sheet, and CRM outbox. Same-day repeats are skipped. Fictional leads only; nothing is sent to a real inbox. Live demo: https://www.twine.net/signin Case study: https://www.twine.net/signin Stack: Python, FastAPI, SQLite, Webhooks, Automation…
    StackPilot: live status page for a small API
    A one-process API had no honest view of health, backups, or rollback. I wrote a reference Compose stack (nginx, FastAPI, Postgres, a pg_dump sidecar) and a native demo that snapshots SQLite and reads host metrics. The live page shows component health, an uptime bar from real self-checks, backup retention, and a read-only inventory explorer for fictional Acme Logistics. This is a demo, not a client engagement. Live demo: https://www.twine.net/signin Case study: https://www.twine.net/signin Stack: Python, FastAPI, Docker, nginx, PostgreSQL…
    VPS Docker and n8n Stack Handoff

    A repeatable handoff pattern for a VPS-hosted app or self-hosted n8n stack.

    Scope:

    • Baseline OS, SSH, firewall, and DNS checks
    • Docker Compose service set for an app or n8n + Postgres
    • Nginx/Caddy TLS front door
    • Nightly backup script and restore dry-run notes
    • One-page handoff with acceptance ticks for a practical 48-hour delivery

    The attached sample kit includes the 48h acceptance checklist, micro-spike checklist, Make↔n8n handoff module map, and documentation examples. No client name, logo, review, KPI, or secret is claimed; any performance figures are marked [EXAMPLE].

    n8n Lead Enrichment with OpenAI-Compatible LLM

    A small n8n demo that turns raw B2B lead fields into a structured next-action summary.

    Flow:

    • Manual trigger sets sample lead fields
    • HTTP chat-completions request to an OpenAI-compatible {OPENAI_BASE_URL}
    • Parse enriched_summary, icp_fit (1–5), and next_action
    • Return clean JSON for a Sheet or CRM handoff

    Deliverables on disk: importable workflow_lead_enrich_llm.json, FLOW.md, README.md, and fictional *.example sample rows. API keys stay in the environment; no secrets are embedded. Any throughput or timing figures are marked [EXAMPLE], not a past paid-job claim.

    n8n Webhook to Google Sheets Lead Capture

    A self-hosted n8n lead-capture workflow for landing-page or form webhooks.

    Problem: ad-hoc JSON leads lacked a durable row store and clear success response.

    Approach:

    • Importable workflow: n8n_webhook_sheets/workflow_webhook_to_sheets.json
    • Normalize company, email, country, source, and received_at
    • Append to a Leads sheet and return { ok: true, … }
    • Add Header Auth before production; the demo intentionally has no auth

    Deliverables on disk: workflow JSON, FLOW.md, README.md, and a curl sample in the freelance sample kit. The demo uses fictional data and contains no secrets. Any client-outcome figures are marked [EXAMPLE], not a past paid-job claim.

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