Open to opportunities

Marián Šedaj

@mariansedaj

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Senior full‑stack developer, LLM engineer

Slovakia

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What I'm looking for

I am seeking senior engineering roles where I can build scalable web applications, design APIs, mentor teams, and work in a collaborative environment that values clean architecture and reliable deployment practices.

Senior full‑stack software engineer, DevOps & AI Platform Engineer with extensive 14 years of experience building web applications, APIs and enterprise systems, primarily using Java, PHP, Python and Elixir with combination with modern JavaScript frameworks.

Over the past decade I have delivered backend and frontend solutions for medical, enterprise and ecommerce client projects, working with Laravel, Symfony, Flask, Phoenix, Nette, Zend or CMS/ecommerce platforms such as Magento.

I have strong frontend experience with React (redux, material‑ui), Angular, TypeScript and build tooling, linux server administration, Docker/Kubernetes deployment and code audits.

I value clear architecture, reliable APIs and collaborative delivery; I bring a proven track record as a freelance and in‑house senior developer responsible for end‑to‑end development and mentoring technical teams.

Experience

Work history, roles, and key accomplishments

Current

Senior Fullstack & DevOps Engineer

Current

Titans Freelancers

Sep 2020 - Present (5 years 8 months)

Developed and maintained the EMIS internal customer-facing portal, owning full-stack development, DevOps, and overall stack architecture.

Full Stack DevOps System Architecture React Elixir Frontend Development Backend Development Agile Scrum

Current

Software Engineer

Current

TITANS freelancers, s.r.o.

Sep 2020 - Present (5 years 8 months)

Developed and maintained web and medical systems using PHP and modern frameworks, delivering backend APIs and fullstack features while improving reliability and deployment processes.

PHP Laravel Symfony JavaScript React REST APIs MySQL Docker Linux

Current

Senior Fullstack Software Engineer

Current

Titans Freelancers

Sep 2020 - Present (5 years 8 months)

Designed and led architecture for an AI-powered internal communications platform using RAG and LLM pipelines, including vector database and semantic search. Built and maintained an internal EMIS system with a customer-facing portal.

RAG Vector Databases Semantic Search System Architecture Platform Engineering Customer Portal Development

Senior Fullstack Software Engineer

QBSW

Aug 2017 - Sep 2020 (3 years 1 month)

Built and improved web systems across frontend, backend, and infrastructure, contributing to system and stack architecture within Agile/Scrum delivery.

System Architecture Web Application Development Frontend Development Backend Development Infrastructure Agile Scrum

Senior Web Developer

MONOGRAM Technologies

Dec 2015 - Jul 2017 (1 year 7 months)

Led PHP application development and frameworks integration, implemented frontend features with Angular/React and managed deployments and server administration.

PHP Symfony Typo3 Nette Angular React Magento Linux CI CD

Senior Fullstack Software Engineer

Monogram

Dec 2015 - Jul 2017 (1 year 7 months)

Built and improved full-stack web solutions for prominent Slovak portals, working in fast Agile/Scrum teams. Applied backend and frontend development with modern JavaScript frameworks and multiple server-side technologies.

PHP Elixir Java Rust Python Ruby on Rails React Angular JavaScript

Fullstack Software Engineer

Monogram

Dec 2015 - Jul 2017 (1 year 7 months)

Delivered full-stack development for several prominent Slovak web portals, working in fast iterations using Agile/Scrum and maintaining reliable codebases.

Full Stack Web Development PHP Java Python Ruby on Rails React Angular Agile Scrum

Senior Web Developer

Everlution s.r.o.

Oct 2016 - Dec 2016 (2 months)

Delivered web solutions as a part-time external consultant, building PHP-based applications and providing development and architectural guidance for client projects.

PHP Nette Zend REST APIs Backend Development Consulting