A Self-Taught IT Engineer with over 14 years of hands-on coding experience and a deep passion for building efficient, standalone technology solutions from the ground up. My journey in IT is one of organic exploration, where I develop my skills by solving real-world problems, often avoiding unnecessary dependencies and striving for a profound understanding of fundamental mechanisms.
I bridge the world of advanced web development with unique expertise in CNC machine programming, which translates into an engineering mindset, a keen eye for precision, and a focus on optimization.
- Frontend: HTML+CSS (8/10), JavaScript (9/10), jQuery (9/10 – mastery level). Crafting advanced, dynamic UIs without relying on heavy frameworks.
- Backend: Node.js (with an emphasis on native modules; 9/10), PHP (5/10). Building robust and scalable server-side applications.
- AI & LLM:
- Prompt Engineering (9.5/10): Expertise in designing and optimizing prompts to elicit desired responses and behaviors from Large Language Models.
- Practical Exploration: Intensive testing and utilization of Open Source models (<70B parameters) on rented GPU infrastructure (3x RTX A5000, 72GB VRAM for 5 months).
- API Experience: Extensive work with various LLM provider APIs (Gemini, Anthropic, Mistral, xAi, Openai...), with a consumption of billions of tokens (over 1.6 billion on Gemini API alone, ~4-4.5 billion total).
- Tooling Development: Building systems for unified LLM access, AI pipelines, and agents to enhance work with language models.
- Databases & Storage: Designing and implementing lightweight, file-based JSON databases (with relational capabilities), caching systems (LRU, TTL), and Redis-like in-memory solutions.
- Tools & Other: C++ (2.5/10), Web Scraping, Parsers (HTML), Template Engines, Middleware (HTTP, Security, Proxy), Token Generation, Testing Systems.
- CNC Programming: 7-8 years of experience with CNC machines (Fanuc, Heidenhain, Siemens, Meldas, Mazatrol), contributing to precision and analytical thinking in IT.
- Engineering Minimalism: Striving for simplicity, control, and avoiding unnecessary dependencies. Every component must have its justification.
- Craftsmanship & Care: Treating code as a craft that demands diligence, clarity, and attention to detail. I prefer object-oriented structures and functions, valuing readability.
- Performance Through Understanding: A deep understanding of underlying mechanisms (e.g., Node.js Event Loop) allows me to consciously optimize solutions.
- Security "By Design": An integral part of the design and implementation process from the outset.
- Pragmatic Problem Solving: "There's no programming task I wouldn't accomplish" in the web context – confidence born from years of practice.
While many of my projects remain private, I specialize in building tools such as:
- AI Systems: Autonomous search agents, abstraction layers for LLMs, AI processing pipelines.
- Web Tools: Lightweight backend frameworks, rendering engines, advanced parsers, and scrapers.
- Data Solutions: Custom file-based database systems and caching mechanisms.
- Developer Utilities: Test automation systems, helper libraries.
I own a powerful server infrastructure (including 3x RTX A5000 GPUs), which serves as my lab for experiments and ambitious projects, especially in the AI field.
After 14 years of independent exploration and building advanced solutions driven by passion, I am ready to bring my unique experience and skills into a commercial environment. I am looking for challenges that will allow me to grow further, particularly in AI, backend development, and creating innovative tools.
- Portfolio/Website: jsle.eu
- LinkedIn: linkedin.com/in/jsle-eu
- [[email protected]]
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