# Mohammad Shadikur Rahman

> Senior infrastructure architect and full-stack engineer with 14+ years of experience in cloud infrastructure, DevOps, telecommunications, and software engineering.
> Building infrastructure as code at OTTO in Hamburg, Germany. Specializing in AWS CDK, microservices, Linux, and VoIP platforms (FreeSWITCH, OpenSIPS, Teams Direct Routing).

Full stack engineer with 14+ years of experience on IT modernization, system integration, cloud infrastructure, and VoIP platforms.

## Core Pages
- [Homepage / Overview](https://shadikur.com): Developer portfolio, about summary, key metrics, and direct contact options.
- [Work / Case Studies](https://shadikur.com/work.txt): In-depth case studies of cloud infrastructure, telecom automation, and full-stack applications.
- [Experience & Career](https://shadikur.com/experience.txt): 14+ year career history spanning AWS CDK, VoIP platforms, microservices, and IT modernization.
- [Blog](https://shadikur.com/blog.txt): Technical articles and tutorials on cloud architecture, DevOps, telecommunications, and modern web development.
- [Uses / Environment](https://shadikur.com/uses.txt): Hardware, software, tooling, and environment setup.

## Featured & Key Projects
- [FusionPBX automation](https://shadikur.com/work/fusionpbx-automation.txt): A production multi-tenant communications platform that automates PBX provisioning, backups, and health monitoring—turning repeatable telecom operations into a scalable service. (Stack: FreeSWITCH, FusionPBX, PHP, PostgreSQL, Azure Functions, SIP, Automation)
- [Local LLM, Voice Agent & AI Infrastructure Lab](https://shadikur.com/work/local-llm-voice-agent-ai-infrastructure-lab.txt): A hands-on AI infrastructure lab for private local language models, real-time conversational voice agents, GPU-accelerated speech recognition and reliable workflow automation. (Stack: Local LLMs, AI Agents, Whisper, LiveKit, Docker, GPU Inference, Speech Recognition, Voice Agents)
- [Teams ↔ OpenSIPS SBC](https://shadikur.com/work/teams-opensips-sbc.txt): A custom session border controller connecting Microsoft Teams Direct Routing with existing SIP infrastructure, providing controlled signaling, media routing, and interoperability. (Stack: Microsoft Teams, OpenSIPS, SIP, RTPProxy, Linux, Direct Routing)
- [Proxmox installer](https://shadikur.com/work/proxmox-installer.txt): A repeatable bare-metal provisioning workflow that converts a minimal Debian server into a ready-to-manage Proxmox VE hypervisor with a single command. (Stack: Proxmox VE, Debian 12/13, Shell, Linux, Virtualization, Automation)
- [Leben in Deutschland App (lebentest.de)](https://shadikur.com/work/leben-in-deutschland-app-lebentest-de.txt): A full-stack learning platform that helps people prepare for Germany’s Leben in Deutschland citizenship test through an accessible, structured online experience. (Stack: Next.js, React, Express, MongoDB, Clerk, Node.js, Authentication)

## Professional Experience
- [Software Engineer at OTTO](https://shadikur.com/experience.txt): Dec 2024 — now | Hamburg, hybrid. Key focus: Modernize AWS infrastructure by migrating Serverless Framework and Terraform workloads to AWS CDK and TypeScript. (Tech: AWS, AWS CDK, TypeScript, Lambda, API Gateway, DynamoDB, S3, IAM, CloudWatch, GitLab CI/CD, GitHub Actions, Infrastructure as Code)
- [IT System Engineer at Guidepoint](https://shadikur.com/experience.txt): Nov 2019 — Jun 2024 | Düsseldorf. Key focus: Owned on-site networking and hardware infrastructure end to end: replacement, maintenance, monitoring. (Tech: Azure AD, PowerShell, Microsoft Teams, OpenSIPS, Avaya, Windows Server, Linux)
- [Full Stack Engineer at count7](https://shadikur.com/experience.txt): Feb 2015 — Apr 2019 | London. Key focus: Installed and configured 200+ FreePBX (Asterisk) and FusionPBX (FreeSWITCH) systems, with custom modules per customer. (Tech: Asterisk, FreeSWITCH, PHP, MySQL, JavaScript, Cisco, MikroTik, VoIP)
- [QA Engineer at SBSystem UK](https://shadikur.com/experience.txt): Dec 2010 — Oct 2013 | London. Key focus: Wrote and ran Selenium WebDriver suites against Java products, from functional cases through performance. (Tech: Selenium, Java, Docker, Jenkins, Jira, Test Automation)

## Blog Articles
- [How Playwright MCP and Local LLMs Are Changing QA Automation](https://shadikur.com/blog/playwright-mcp-local-llms-qa-automation.txt): Playwright MCP lets QA engineers connect browser automation to local or cloud LLMs. Learn how the workflow works, what consumer hardware can handle, and where human review still matters.
- [The Hugging Face AI Agent Breach: What Happened and Why It Matters](https://shadikur.com/blog/hugging-face-ai-agent-breach-what-happened.txt): Autonomous AI agents escaped a restricted cybersecurity evaluation and compromised Hugging Face infrastructure. Here is what happened, why reward hacking mattered, and seven security lessons for teams building AI agents.
- [Why Apple’s M5 Ultra Mac Studio Could Transform Local LLMs](https://shadikur.com/blog/apple-m5-ultra-mac-studio-local-llms-unified-memory.txt): Apple’s new M5 Ultra Mac Studio offers up to 512GB of unified memory and 1.2TB/s bandwidth. Here is why that matters for local LLMs, OpenClaw, private AI agents, and developers—and where the limits remain.
- [Cloudflare R2 for Beginners: Complete Getting Started Tutorial](https://shadikur.com/blog/cloudflare-r2-beginners-getting-started-tutorial.txt): Learn how Cloudflare R2 object storage works and create your first bucket, upload files, configure S3 API credentials, and connect with the AWS CLI.

## Technical Skills
- **Cloud & platform engineering**: Amazon Web Services (AWS), AWS CDK, Lambda, API Gateway, DynamoDB, S3, IAM, CloudWatch, Infrastructure as Code, GitLab CI/CD, GitHub Actions, Docker, Linux, Azure
- **AI infrastructure**: Local LLMs, AI Agents, Whisper, Speech Recognition, GPU Inference, LiveKit, Voice Agents, Workflow Automation, Docker
- **Backend & data**: Node.js, Express, TypeScript, Python, Java, PHP, PostgreSQL, MongoDB, MySQL, Redis
- **Frontend**: React, Next.js, TypeScript, JavaScript, Tailwind, HTML/CSS
- **Telecom**: FreeSWITCH, FusionPBX, Asterisk, OpenSIPS, SIP, RTPProxy, Teams Direct Routing
- **Engineering practice**: Platform Engineering, System Integration, Automation, Observability, Security, Documentation, Mentoring, Agile Delivery

## Detailed Context for LLMs
- [Full Text Context](https://shadikur.com/llms-full.txt): Complete expanded document containing full case study write-ups, detailed career history, education, and full article texts for deep AI processing.

## Contact & Links
- **Email**: hello@shadikur.com
- **Location**: Hamburg, Germany
- **GitHub**: https://github.com/shadikur
- **LinkedIn**: https://www.linkedin.com/in/shadikur/
- **Twitter / X**: https://twitter.com/Shadikur