Open to opportunities

Serhii User

@serhiiuser3

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I’m an AI architect building production AI platforms and full-stack products end-to-end.

Poland

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What I'm looking for

I’m looking for a startup or early-stage product company where I can drive the AI architecture end-to-end—from LLM orchestration design to production deployment. I thrive with ownership and direct access to decision-making.

I build production platforms end-to-end, from enterprise AI engines and distributed search to full-stack product delivery. I co-created Creatio AI, owning architecture decisions across the entire stack: domain modeling, LLM orchestration, and fault-tolerant infrastructure.

I designed the Global Search microservice from zero—still running without major changes after 8+ years as the company’s reference architecture. I focus on longevity: microservice-based AI engine architecture, framework migrations, and component reuse that become lasting technical direction.

I’m especially deep in LLM orchestration, agent patterns, and smart routing, with a current solo build of an AI engine platform (XMesh AI) featuring multi-strategy reasoning and DSL-based agent graphs. I thrive with ownership and direct access to decision-making, delivering complex solutions independently for lean teams.

Experience

Work history, roles, and key accomplishments

AI Architect & Full Stack

Creatio

Aug 2015 - Mar 2026 (10 years 7 months)

Co-created Creatio AI/Copilot and led architecture decisions across LLM orchestration, RAG, testing, and fault-tolerant infrastructure. Designed the Global Search microservice from zero (still running after 8+ years) and improved Elasticsearch query performance by 7–13× while establishing CI/CD, evaluation frameworks, and microservice architecture adopted at company level.

LLM Orchestration Frameworks LangGraph Microservices Elasticsearch Kubernetes TypeScript Vue.Js Docker CI CD

Full Stack Engineer

UkrAvto / Phalcon Auto / KIA Ukraine

Aug 2012 - Jun 2016 (3 years 10 months)

Built and operated a 24/7 TV broadcast video analysis system using n-gram-based video fingerprinting to detect ad airings. Developed video streaming infrastructure and camera control panels, and led a team delivering training platforms for Mercedes and KIA service professionals.

Video Fingerprinting Video Streaming AngularJS Java EE REST APIs Team Leadership

Frontend & Web Developer

Nepro100 / Codemotion

Feb 2011 - Aug 2012 (1 year 6 months)

Delivered full-cycle web development and FreeBSD server administration, self-teaching core backend/frontend skills through practical projects. Built a chess platform as a learning project, including a browser-based chess engine.

FreeBSD Full Stack Web Development JavaScript PHP Server Administration Frontend Learning By Building

Education

Degrees, certifications, and relevant coursework

National Pedagogical Dragomanov University

Specialist Degree, Philosophy & Practical Psychology

2006 - 2012

Activities and societies: Taught a human & AI lecture for ~100 psychology students (YouTube demo). Volunteered teaching a free HTML/CSS/JavaScript course for beginners; 10+ years of personal professional support experience.

Earned a Specialist degree in Philosophy & Practical Psychology at National Pedagogical Dragomanov University (2006–2012). Currently in 1st-level Gestalt therapy training, with experience in human & AI lecture delivery and teaching beginner web development.