JAKUB ŚLEDZIKOWSKI

JavaScript Master ∙ AI/Prompt Engineer ∙ Zero-Dependencies Architect

14+ years of programming. 10M+ lines of my own code. 6B+ tokens used. Zero npm installs.

I build everything from scratch (since '12) - because it's faster, safer, and just better. Every framework is technical debt waiting to explode. I prefer control.

STACK

JavaScript and beyond - some say "that's all?", others just smile :)

Zero dependencies. Zero surprises. Zero BS.

PHILOSOPHY

"Simpler, faster, more robust."

Every external dependency is a security hole you can't control. Every framework is an abstraction you still have to understand to debug. Vanilla JS works everywhere and always.

CONTACT

You've bounced off hundreds of "experts" from LinkedIn and agencies who'll throw boilerplate at you and invoice you 50k.

I'll build you something that still works 10 years from now.

Email: jakub@jsle.eu

GitHub: github.com/jsle97

LinkedIn: linkedin.com/in/jsle-eu/

PROJECTS

• LLMHUB - Advanced web client supporting 100+ AI models (sandbox/web search with 1-720 URLs per request/tts/stt/audio assistant/file generation/file and image support/memory system/the world's best(?) system for managing context by relevance and size - invented by me). Basically, the most advanced app combining ChatGPT and Claude.ai capabilities. I've nearly eliminated my need to work in VSCode.
• xdVision - Real-time screen analysis powered by voice AI.
• xdB Database - Lightweight JSON database with relational capabilities.
• xdSearch - Multi-phase AI-powered research automation.
• callAI - Unified AI API client integrating 200+ models from 11 providers.
• xdCode - Fully autonomous coder with integrated testing.
• xdSandbox - Sandbox environment service for running code generated by large language models (LLMs).
• xdCLI (v2, v3, up to vN) - Chat-like orchestrator to manage the file system, generate files, and implement any functionality. Interfaces include CLI, web, remote VPS access, and more.
• xdPrompts - API and agent toolkit to create production-grade system prompts for LLM pipelines, hitting a 95% success rate.
• xdSrv, xdB, xdFiles, xdToken, xdRender, xdReq, and other XD libraries - Over 30 custom-built Node.js libraries developed without npm for more than four years (that's right - I've never used npm).
• ...and many more JavaScript-powered projects.

TECHNICAL SKILLS

• JavaScript (14+ years)
• Node.js Ecosystem (9+ years)
• AI/ML Integration & Prompt Engineering
• Database Design & Optimization
• Real-time Systems (WebSockets, SSE)
• Computer Vision & Image Processing
• System Architecture & Security
• Performance Optimization
• CI/CD & DevOps Automation
• Technical Leadership & Mentoring
• Everything else - yes

user@jsle:~$