Technical Proof

Selected Projects

A selection of hands-on work — from this bilingual executive site and EU tender AI (MultipleAusschreibungen / tender-agent) to AWS infrastructure, data pipelines, marketing automation, and workflow tooling.

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siebert.cv — Executive CV & Portfolio

Editorial bilingual executive site combining Web-CV, downloadable PDFs (DE/EN), project showcase, LetsChangeTogether frameworks landing (/lct), insights, and integrated Cal.com consulting. Built with Next.js 16 App Router (Turbopack), React 19, locale proxy, dark/light theming, responsive mobile hero, Vercel Analytics conversion events, and GitHub Actions CI on Node.js 24 (27 HTTP E2E + 37 Playwright viewport checks).

Outcome: Live production site with DE/EN routes, SEO, LCT funnel, and consulting conversion tracking.

Next.js 16 · React 19 · TypeScript · i18n · Web-CV

LYR

HappyImmo — Layered Platform

Platform engineering across four repositories (Infrastructure, DataPool, Backend, Frontend). Infra provisions ephemeral Cloud SQL PostgreSQL 16 with PostGIS, Workload Identity Federation for keyless GitHub Actions auth, budget alerts, Terraform reference modules, and scripted deploy/teardown. Data pool runs 41 versioned ingestion domains — Python ETL and scraping, schema-normalized loads, domain registry, wave-based orchestration, preflight gates, and optional disposable-database E2E in CI. Backend: Node 24 Express (Pino structured logs, prom-client /metrics) on Docker Compose App → PgBouncer (transaction pooling, no prepared statements) → Postgres; compose-smoke and migration checks in CI. Frontend: Vite + React + TypeScript with typecheck/build CI. Local observability: Prometheus metrics, Grafana dashboards, Loki log aggregation.

Outcome: Correlated metrics, logs, and health signals across ingestion pipelines and API runtime — CI-gated loads on ephemeral Cloud SQL.

HappyImmo · GCP · PostGIS · Terraform · Prometheus

Tender Agent — EU Procurement AI

Multi-agent system for EU public tenders. Built with LangGraph and Grok (xAI): analysis, strategy contract, master outline YAML, chapter-by-chapter drafting with curated merge, fragment and coherence review, and human-in-the-loop gates — producing submission-ready proposals with Obsidian-compatible workflows.

Outcome: CERV-scale chapter pipeline with auditable gates and human-in-the-loop review.

Python · LangGraph · Grok · Multi-Agent · EU Tenders

SLK

Slack Community Member Scraper

Test-driven Slack Web Client automation using Playwright — extracts channel members including emails and profile data without API limits, exports JSON/CSV for CRM enrichment, community analytics, and targeted marketing campaigns.

Outcome: CRM-ready member exports without Slack API rate-limit constraints.

Python · Playwright · Slack · Marketing · TDD

AWS Grocery App Infrastructure

Production-ready AWS infrastructure for GroceryMate v2 using Terraform and automated Bash deployment. Immutable EC2 rollouts via Auto Scaling Groups, secrets via AWS Secrets Manager, bastion-based deployment pipeline, RDS PostgreSQL, and Nginx static hosting with integrated CI/CD.

Outcome: Immutable AWS deployments with secrets management and repeatable rollouts.

Terraform · AWS · RDS · React · DevSecOps

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Instagram Scraper

Modular Instagram scraping system with Oxylabs proxy integration, automated scheduling, Instaloader-based collection, SQLite persistence, deduplication, rate-limit handling, and email notifications for reliable long-term operation.

Outcome: Long-running scrape operations with deduplication and proxy failover handling.

Python · Instaloader · Social Media · Marketing · Automation

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