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.𝗡𝗘𝗧 𝗖𝗢𝗥𝗘 | 𝗖# | 𝗔𝗻𝗴𝘂𝗹𝗮𝗿 | 𝗥𝗲𝗮𝗰𝘁 | 𝗔𝘇𝘂𝗿𝗲 | 𝗟𝗲𝗴𝗮𝗰𝘆 𝗠𝗶𝗴𝗿𝗮𝘁𝗶𝗼𝗻 | 𝗔𝗜-𝗔𝘀𝘀𝗶𝘀𝘁𝗲𝗱 | 𝗔𝗣𝗜 𝗜𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻𝘀 | 𝗠𝗶𝗰𝗿𝗼𝘀𝗲𝗿𝘃𝗶𝗰𝗲𝘀 | 𝗛𝗲𝗮𝗹𝘁𝗵𝗰𝗮𝗿𝗲 | 𝗖𝘆𝗯𝗲𝗿𝘀𝗲𝗰𝘂𝗿𝗶𝘁𝘆 
 🏆 100% Job Success, 27,500+ hours on Upwork, 19+ years of professional experience. I take over existing applications, fix what's actually broken, migrate legacy systems without downtime, and build new features end to end when that's what's needed. I started as a developer and grew into VP of Engineering at a corporate SaaS company in Germany. Since 2012, working independently on long production engagements, roughly 8 years of it in healthcare and cybersecurity specifically: a telemedicine platform used by 200+ hospitals, 150,000 providers, and 12 million patients, and an antivirus/cybersecurity SaaS with a real-time telemetry pipeline. Core stack is C# and .NET, Angular as my strongest frontend, React and Node.js/TypeScript where the project calls for it. 𝗪𝗵𝗮𝘁 𝗜 𝗖𝗮𝗻 𝗛𝗲𝗹𝗽 𝗬𝗼𝘂 𝗪𝗶𝘁𝗵 ✓ Migrating ASP.NET Web Forms or older .NET Framework apps to .NET Core / ASP.NET Core ✓ Reading an unfamiliar codebase fast and finding where the real risk is ✓ Full-stack SaaS builds: auth, API, database, admin dashboards, billing ✓ HIPAA-adjacent systems: patient data, scheduling, provider workflows, video/phone/chat visits ✓ Security-conscious backend work: authentication, authorization, careful handling of anything touching PII ✓ High-volume telemetry and messaging: RabbitMQ, MQTT, real-time pipelines with validation and idempotency ✓ REST API design, third-party integrations, payment gateways (Stripe, Authorize.Net) ✓ SQL Server and PostgreSQL schema work, query tuning, data integrity fixes ✓ Azure deployment: App Services, Functions, Azure SQL, Azure AD/Entra ID ✓ Desktop applications in WPF or Windows Forms, including legacy C++ interop ✓ AI-assisted development with Claude and Cursor, every line reviewed before it ships, not vibe coding without review 𝗘𝘅𝗮𝗺𝗽𝗹𝗲𝘀 𝗼𝗳 𝗣𝗮𝘀𝘁 𝗪𝗼𝗿𝗸 ✅ Migrated a telemedicine platform serving 200+ hospitals and 12 million patients from legacy ASP.NET Web Forms and React Native to .NET Core, REST API, and Angular, incrementally, with no downtime, through the load spike of COVID. ✅ Migrated an enterprise cybersecurity SaaS backend from .NET Framework/ASP.NET Web Forms/jQuery to .NET Core/Angular, including a RabbitMQ-based telemetry pipeline handling high-frequency device data with validation and idempotency. ✅ Built and grew a corporate SaaS platform in Germany from the ground up on ASP.NET Web Forms, ending up owning engineering decisions across the whole product as VP of Engineering. 🛠️ 𝗜𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻𝘀 𝗜'𝘃𝗲 𝗪𝗼𝗿𝗸𝗲𝗱 𝗪𝗶𝘁𝗵 • Payments: Stripe, Authorize.Net, Chargify, Paymentwall, Hint • Healthcare data and eRx: Redox, AthenaHealth, EazyScripts, RxNT, PokitDok, Hint • Messaging: Twilio, Plivo (SMS), MailGun, SendGrid, Gmail, custom SMTP (email) • Video and voice (CPaaS): Vonage, LiveKit, Twilio Video, Agora, Daily, Amazon Chime SDK • Reporting: Power BI, Crystal Reports, LogiReports • Auth and identity: JWT, OAuth2, Azure AD / Entra ID OIDC, SSO, MSAL, ADAL • Messaging brokers and real-time: RabbitMQ, Azure Service Bus, MQTT, SignalR 🧭 𝗛𝗼𝘄 𝗜 𝗪𝗼𝗿𝗸 • Understand the business problem, and the existing system, before proposing a technical one • Small, reviewable changes over big risky rewrites • Test what already works before and after every change • Clear written updates, no surprises at the end of a milestone • Available full-time, more than 30 hours a week, based in Cyprus with strong overlap across UK, Europe, and US time zones 🧰 𝗧𝗲𝗰𝗵 𝗦𝘁𝗮𝗰𝗸 C#, .NET Core, .NET Framework, ASP.NET Core, ASP.NET MVC, ASP.NET Web API, Entity Framework, Angular, React, TypeScript, JavaScript, Node.js, SQL Server, PostgreSQL, SQLite, Cosmos DB, Azure, Azure Functions, Azure SQL, Azure AD, RabbitMQ, MQTT, Redis, Elasticsearch, REST API, WPF, Windows Forms, Stripe, Authorize.Net, Git, Claude, Cursor. 📬 If you have a .NET application that's grown hard to maintain, a migration that can't afford downtime, or a product in healthcare or security where reliability actually matters, message me and let's talk about it. I'll tell you honestly whether I'm the right fit before we start.

Strong experience: Angular 2+, TypeScript, RxJS, Angular Material, HTML, CSS, SCSS, Typescript, Git Moderate experience: NestJS, Vue, NgRx, MongoDB, MySQL, Python (Flask, Django)

I build production-grade AI agents and RAG pipelines for B2B SaaS startups whose customers ask about audit trails, ISO 27001 / TISAX, and GDPR. If you have an LLM feature stuck between prototype and production, I can usually ship it in 2-4 weeks. Background: ~10 years in engineering. 8 of them at Scompler, a Munich B2B SaaS used by VW, Deutsche Bahn, Commerzbank. Joined as senior engineer, left as Head of Engineering running 6 teams (~40 people). Left in late 2025 to go all-in on agents. It's been daily, hands-on work ever since. Working stack: Python, Claude Code (subagent pattern), LangGraph + LangChain, Claude API (Anthropic), OpenAI, MCP, mem0, Qdrant, vector embeddings, RAG, eval harnesses, prompt engineering. Running a multi-project LangGraph agent platform in production right now. It is self-developing with human gates: its agents have shipped 460+ merged PRs against the platform's own codebase, with merges and schema changes behind my review. A separate RAG pipeline indexes project docs from CI on every push, with heading-aware chunking and hash-based incremental sync into self-hosted Qdrant via mem0. Comfortable shipping into Rails, Node, or Go backends. I read prod logs before I touch prod code. Most recent shipped artifact: chiplog, my open-source library for signed, hash-chained audit records of AI agent tool calls (linked in my portfolio below). Adapters for Claude Code, LangGraph, OpenAI Agents SDK, and Claude Agent SDK. Dogfooded against my own agent daemon for ten days: 19,037 signed records, chain intact. The useful part was what that run didn't show. The hook was registered for successes only, so it logged zero failures and looked perfect, then stopped recording entirely and nobody noticed for thirteen days. A log that silently stops is indistinguishable from an agent that did nothing. That finding is most of what v0.2 fixes, and the numbers are all on the repo's front page. It's a developer preview, not audit-ready evidence, and the README says so before it says anything else. Examples of what I can ship in 2-4 weeks: - A LangGraph agent with a real eval harness so you can tell when it regresses. - A RAG pipeline over your docs with reranking, Qdrant, and a cost-per-query budget you actually monitor. - A Claude/OpenAI integration into your Rails or Node app, with audit logs, request tracing, and a kill switch. - A multi-agent prototype that proves out (or kills) an architecture before you commit headcount. Why I'm useful for B2B / regulated buyers specifically: I shipped product for DAX-listed enterprise buyers (VW, Deutsche Bahn, Commerzbank) whose security teams run rigorous procurement reviews. Got Scompler through ISO 27001, ISO 27017, and TISAX in the same audit cycle. I can ship the AI feature and answer your security questionnaire in the same engagement. How I work: a short discovery call, then a fixed-scope mini-engagement of 1-2 weeks. After that we either keep going, or you walk away with a working piece you can keep. No 6-month minimums. When a sprint grows into an ongoing need, I also take fractional CTO engagements (2 days a week, 3+ months). Cyprus-based (UTC+2), strong overlap with EU and US East Coast. EN working, RU native. Message me with your stack and what's stuck. I'll tell you within 24h whether I can help, and if I can't, who I'd send you to.

Experienced Technical Writer with emphasis on SRE, DevOps, and Cloud topics. Experienced DevOps engineer with significant experience in Infrastructure as Code using Terraform on multiple Hyperscalers and Cloud providers.