Hello, I'm
Marek Bytnar
Independent Software Engineer & Technical Lead | Ruby, JavaScript, AI/LLM
Self-directed engineer with 18 years building production systems at scale. Operating independently as a B2B contractor, I've delivered 2,200+ pull requests across 45+ repositories—from legal technology and customer communication platforms to AI/LLM integration using Amazon Bedrock. Expert in autonomous technical leadership, system architecture, and modernization.
About Me
Independent Software Engineer with 18 years building business-critical systems across multiple domains. Operating autonomously as a B2B contractor for AirHelp since 2016, I work self-directed without managerial oversight, delivering 2,200+ merged pull requests across 45+ repositories. Recently designed and deployed production-grade LLM pipelines using Amazon Bedrock (Claude models), implementing cost optimization through prompt caching, concurrency management, and comprehensive observability.
Expert in Ruby on Rails ecosystem with strong full-stack capabilities spanning legal technology (850+ PRs), infrastructure management (295+ PRs), and customer communication platforms (300+ PRs). I independently scope, design, and implement complex features—from IAM security improvements to AI-powered message summarization and real-time notification systems.
Self-directed technical leader who takes full ownership from architecture to implementation. I bridge traditional software engineering with modern AI capabilities, maintaining legacy systems while introducing cutting-edge features. My autonomous work style, combined with deep technical expertise and comprehensive documentation practices, enables me to deliver scalable solutions that balance technical excellence with business pragmatism.
Experience
Latest Projects
AI-Powered Communication System
Independent Technical Lead & AI Integration Architect
Ruby on Rails, AWS Bedrock (Claude), Langfuse, Kubernetes, PostgreSQL
Self-directed design and implementation of production-grade LLM pipeline processing thousands of messages daily. Built end-to-end system handling message summarization and email classification with autonomous cost optimization (prompt caching, concurrency management), PII safety, and comprehensive monitoring. Independently architected communication data models across microservices.
Legal Technology Platform (Eagle)
Independent Technical Lead & Full-stack Developer
Ruby on Rails, PostgreSQL, Sidekiq, React.js, Docker, Cypress (850+ PRs)
Built comprehensive legal case management system from scratch supporting document generation, workflow automation, and external lawyer integration. Independently architected domain decoupling from company monolith. Led team of ~5 developers while maintaining hands-on technical ownership. Implemented SPA architecture with RESTful API and comprehensive test coverage.
Document Generation System
Independent Backend Architect
Ruby on Rails, ERB, json-schema-form, PostgreSQL
Independently conceptualized and built automated document generation system for pre-legal and legal workflows. Designed flexible schema-driven architecture supporting multi-jurisdiction compliance and dynamic template management.
Customer Support Platform (Cockpit)
Backend Developer & Domain Architect
Ruby on Rails, PostgreSQL, Microfrontends (300+ PRs)
Developed finance and legal functionalities within large monolithic application. Independently architected and executed legal domain decoupling strategy, improving system maintainability and team autonomy. Contributed to microfrontend architecture evolution.
Tripcase (Travel Assistant)
Backend Developer
Ruby on Rails, MariaDB, Backbone.js
Worked on a complex project developed by multiple teams across different locations. Successfully refactored the core part of the application handling trips source data.
Work History
Independent Software Engineer & Technical Lead
AirHelp (B2B Contractor)
2016 - Present (2,200+ PRs across 45+ repositories)
Self-directed technical partner working autonomously without managerial oversight. Full ownership of projects spanning legal technology (850+ PRs), infrastructure management (295+ PRs), customer communication platforms (300+ PRs), and AI/LLM integration. Independent technical decision-making, system architecture, and team enablement through documentation and mentoring.
Senior Software Developer
Sabre Corporation
2014 - 2016
Developed enterprise-grade travel technology solutions. Worked on complex systems handling high-volume transactions for the global travel industry.
Software Developer
Sabre Corporation
2013 - 2014
Backend development and system optimization for travel technology platforms.
Software Developer
Startups (Digital Mines, CloudVertical)
2011 - 2013
Early-stage startup development experience, building products from the ground up in fast-paced environments.