Marek Sęk-AI Architect Self-Hosted Inference, Agents, MCP & A2A, AI-Assisted Delivery
Check rate
Experience
Engineering Manager, AI Platform
Zen Technology
- Shipped brand-conditioned image generation running entirely on self-hosted hardware in April 2024 — newly generated graphics rendered in a customer's own visual style, at a point when this was not available off the shelf.
- Own the architecture and operation of the hardware and inference layer: self-hosted LLM serving on vLLM, GPU provisioning and sizing, model deployment, rollout and observability across an estate of ~100 AI servers, ~20 in continuous production use with models serving 24/7.
- Led the teams that built the agent layer — agents and multi-agent swarms, tool integration over MCP, inter-agent communication over A2A, and a browser chat surface combining all of it across both self-hosted and API models.
- Own delivery end to end across three teams — two backend, one frontend — including planning, external dependencies, and contractor and employee matters.
- Hold the client and user relationship directly throughout, across several shifts in product direction.
Senior Frontend Developer
intive
- Streaming and TV client applications — JavaScript, React, Node.js, Roku / BrightScript on AWS.
Skills: Roku, BrightScript
Co-Founder & CTO
Mosaic Meet
- Owned product and engineering for a real-time in-browser group chat connecting travellers and digital nomads across cultures — WebRTC, React, Next.js, Node.js, Firebase.
- Ran the technical side of a small company end to end: architecture, build, infrastructure and hiring.
- Backed by the Hong Kong Science and Technology Park, one of the region's largest incubators.
Skills: JavaScript, React.js, and 9 more
Senior Frontend Developer / Team Lead
WorldRemit
- Led a frontend team in a regulated fintech environment — React, Node.js.
Skills: JavaScript, React.js, and 6 more
Senior Frontend Developer
Grand Parade (William Hill)
- CEMS, the content management system behind William Hill — React, PHP7 / Laravel, MySQL, at consumer scale.
- Frontend Developer (Jun 2017 – Jul 2018), promoted to Senior Frontend Developer (Aug 2018 – Jan 2019).
Skills: JavaScript, React.js, and 6 more
Frontend Developer
IG
Skills: JavaScript, PHP, and 5 more
Frontend Developer
International Coupons
Skills: JavaScript, Web Development, and 4 more
Full Stack Developer
Binary Minds
Skills: JavaScript, PHP, and 4 more
Advertising Specialist
WebReklama Kraków
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Information Technology, Tourism, Banking and Finance, Media and Entertainment, Telecommunication, and Advertising.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology, Product Development, Operations, Project Management, Human Resources, and Marketing.
Summary
Engineer and technical lead who builds AI systems and runs the hardware underneath them. Nearly three years leading an AI platform — model deployment and observability across a ~100-server estate, agent and multi-agent orchestration over MCP and A2A, self-hosted and API models side by side. Two years before that as CTO of a real-time product. Works in English daily with distributed teams.
Skills
Ai Infrastructure
Self-Hosted Llm Serving
Vllm
Gpu Provisioning And Sizing
Proxmox, Pci Passthrough
Model Deployment, Rollout And Observability
Self-Host Vs. Api Cost Economics
Agent Systems
Multi-Agent Orchestration And Swarms
Mcp
A2a
Tool Use
Local And Api Models In One System
Ai-Assisted Sdlc
Claude Code As Primary Development Method
Spec-Driven Development
Scheduled Autonomous Agents
Engineering
Typescript / Javascript
React
Next.Js
Node.Js
Python
Postgresql
Aws
Docker
Languages
Education
AGH University of Science and Technology
Engineer's degree · Computer Science · Kraków, Poland
Statistics
Experience
Global experience
Expertise
Qualifications
Profile
Frequently asked questions
Have questions? Find more information here.
Marek is based in Rzeszów, Poland and can operate in on-site, hybrid, and remote work models.
Marek speaks the following languages: Polish (Native), English (Advanced).
Marek has at least 13 years of experience. During this time, Marek has worked in at least 7 different roles and for 9 different companies. The average length of individual experience is 2 years and 6 months. Note that Marek may not have shared all experience and actually has more experience.
Based on recent experience, Marek would be well-suited for roles such as: Engineering Manager, AI Platform, Senior Frontend Developer, Co-Founder & CTO.
Marek's most recent position is Engineering Manager, AI Platform at Zen Technology.
In recent years, Marek has worked for Zen Technology, intive, and Mosaic Meet.
Marek is most experienced in industries like Information Technology, Tourism, and Banking and Finance. Marek also has some experience in Media and Entertainment, Telecommunication, and Advertising.
Marek is most experienced in business areas like Information Technology, Product Development, and Operations. Marek also has some experience in Project Management, Human Resources, and Marketing.
Marek has recently worked in industries like Information Technology, Tourism, and Media and Entertainment.
Marek has recently worked in business areas like Information Technology, Product Development, and Operations.
Marek holds a Bachelor in Computer Science from AGH University of Science and Technology.
Marek is immediately available full-time for suitable projects.
Daily rate distribution
The rates shown represent the typical market range for freelancers in this position based on recent contracts on our platform.
Average rates for similar positions
Rates are based on recent contracts and do not include FRATCH margin.
The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.
The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.
Calculated based on our freelancers’ daily rates as of 7 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
Similar freelancers
Discover other experts with similar qualifications and experience
Daniel Suszczynski
Lukasz Czerwinski
Patryk Pawłowski
Maciej Rosiek
Sebastian Kaczmarczyk
Sebastian Schkudlara
Martin Musiol
Maciej Sawicki
Damian Śniatecki
Oliver Kirst
Experts recently working on similar projects
Freelancers with hands-on experience in comparable project as a Engineering Manager, AI Platform
Beata Klaudia Wilczek
Marcin Walisiewicz-Niedbalski
Mateusz Majchrzak
Bogdan Bak
Jan Szumiec
Paweł Mucha
Marek Werulik
Stefan Ojanen
Agnieszka Chmielowiec
Makpal Ikramova
Nearby freelancers
Professionals working in or nearby Rzeszów, Poland
Marcel Olszewski
Daniel Jasinski
Hadi Jafari
Szymon Bochniak
Zbigniew Siatkowski
Paula Franco
Adam Cemerys
Kamil Maruta
Beata Pasikowska
Pawel Owerczuk
