Jakub Halbrštát
Web developer · AI automation · Design
Pardubice, Czech Republic
jakub.halbrstat@gmail.com
+420 607 037 757
halbrstat.com
github.com/CronnyC
Profile
Full-stack developer focused on AI automation and fast delivery. I build complete products alone, from the backend and AI pipelines to the interface and the brand, and deliver in days rather than weeks. Native Czech, fluent English. Open to client work and to employment.
Projects
Cuppa AI English tutor with voice calls · sole developer in a small team
- Real-time voice conversations (speech to text, LLM, text to speech), streamed in chunks for low latency and kept to about 1 Kč per minute.
- AI feedback, generated flashcards and adaptive exercises.
- Company accounts with registration codes, and one dashboard with four role views: student, teacher, company manager, admin.
- PWA with push notifications. Closed beta.
Basilisk Crypto charts and backtests · solo
- Backtests of Binance perpetual futures that include fees, slippage and funding.
- Self-hosted on Hetzner.
SIM Instagram autopilot · solo
- Generates Instagram posts with AI and publishes them on a schedule.
Streamchair Creator platform, graduation project · solo
- Social feed, profiles, messages and rewards on Firebase (Auth, Firestore, Storage).
- Thesis: 7P marketing mix, monetisation model, competitor and SWOT analysis, brand identity.
Constance Own product brand · solo
- Brand identity, packaging design and online shop.
- Influencer collaborations, packing and shipping through Zásilkovna.
Market data and neural networks about 1.5 years
- Own indicators and strategy backtests in Pine Script.
- Processed about 1 TB of market data on rented GPUs and cloud storage to train a neural network predicting crypto price moves.
Automation and generative AI
- n8n, Make.com and Zapier workflows, including a news account on X that posted on its own every six hours.
- ComfyUI pipelines and LoRA training.
Also
- Logo design, rashguards for an MMA gym, a 3D Blender room used as an app's navigation, and studio-24.cz, a photo-editing service I built and deployed.
Education
Delta SŠIE, Pardubice Information technology, 2022–2026, maturita
- Programming, databases and networks, plus design, studio photography, marketing (email, Google Ads) and economics.
Skills
- Code JavaScript, React, Python, C#, SQL, HTML/CSS, Git, AI-assisted development (Claude Code).
- Backend and cloud Firebase, Supabase, Hetzner, Cloudflare (R2, DNS), Vercel, domain management, PWA and push notifications.
- AI OpenRouter, voice pipelines, LLM integration, ComfyUI, LoRA, n8n, Make.com, Zapier.
- Design Brand identity, packaging, Blender, Photoshop.
Languages
Czech (native) · English (C1–C2) · German (basic)
Outside work
MMA, guitar (10 years), dog training.