09/21/2026 updated
100 % available
Senior / Staff / Principal Engineer | Platform Architect | AI-Native
Kraków, Poland
Only remote
MSc, Human-Computer Interaction, Informatics & Web Development, Jagiellonian UniversityAbout me
Senior Ruby / Ruby on Rails Freelancer and Software Architect with extensive experience on the German market. I’ve worked with companies including Xing.com, sum.cumo and MotionTools, building scalable backend systems, from large platforms serving millions of users to smaller startups.
Amazon Web ServicesCloud ComputingPython (Programming Language)PostgreSQLTelemetryRuby On RailsRubySecurity AdministrationSecurity AwarenessMetricsKubernetesElastic Beanstalk
Platform Architecture & System Design
Ownership of end-to-end platform architecture across large-scale, multi-region systems. Design of data models, API contracts, and service boundaries from greenfield to production, including compliance-critical integrations with regulated data providers such as TransUnion and AmRent.
AI-Augmented Engineering
Application of LLMs and AI tooling as force multipliers across design, development, and code review workflows. LLM-assisted code generation and architectural analysis to increase engineering throughput in high-stakes delivery contexts.
Cloud & Backend Engineering
Deep expertise in backend development using Ruby, Python, Go, and TypeScript/JavaScript. Hands-on experience with PostgreSQL, AWS, microservices, AMQP, GraphQL, and REST for building reliable, scalable production systems.
CI/CD & DevOps Practices
Definition and establishment of CI/CD pipelines, disaster recovery plans, capacity models, and security review processes from scratch in environments where no prior standards existed.
KYC/AML Compliance Engineering
Design and ownership of integration architecture for KYC/AML-adjacent tenant screening with regulated providers. Translation of regulatory requirements into architectural constraints and technical specifications with zero major incidents over 8+ years.
High-Availability Infrastructure
Engineering of push notification systems (APNS/WNS/GCM) and high-availability, latency-sensitive infrastructure serving 20M+ users at social-platform scale.
Geospatial & Data Pipeline Systems
Build-vs-buy and vendor selection decisions on geospatial tooling, data pipelines, and screening integrations. Cross-functional technical ownership spanning property management, geospatial systems, reporting pipelines, and data science platforms.
HPC Administration
14 years of HPC administration and research collaboration in bioinformatics and biophysics, building deep intuition for systems at scale, data integrity, and long-lived infrastructure.
Agile Process & Distributed Team Leadership
Application of Agile methodologies including Scrum and Kanban for distributed team leadership, technical roadmapping, and mentoring engineers. Certified Professional Scrum Product Owner and Scrum Master.
Ownership of end-to-end platform architecture across large-scale, multi-region systems. Design of data models, API contracts, and service boundaries from greenfield to production, including compliance-critical integrations with regulated data providers such as TransUnion and AmRent.
AI-Augmented Engineering
Application of LLMs and AI tooling as force multipliers across design, development, and code review workflows. LLM-assisted code generation and architectural analysis to increase engineering throughput in high-stakes delivery contexts.
Cloud & Backend Engineering
Deep expertise in backend development using Ruby, Python, Go, and TypeScript/JavaScript. Hands-on experience with PostgreSQL, AWS, microservices, AMQP, GraphQL, and REST for building reliable, scalable production systems.
CI/CD & DevOps Practices
Definition and establishment of CI/CD pipelines, disaster recovery plans, capacity models, and security review processes from scratch in environments where no prior standards existed.
KYC/AML Compliance Engineering
Design and ownership of integration architecture for KYC/AML-adjacent tenant screening with regulated providers. Translation of regulatory requirements into architectural constraints and technical specifications with zero major incidents over 8+ years.
High-Availability Infrastructure
Engineering of push notification systems (APNS/WNS/GCM) and high-availability, latency-sensitive infrastructure serving 20M+ users at social-platform scale.
Geospatial & Data Pipeline Systems
Build-vs-buy and vendor selection decisions on geospatial tooling, data pipelines, and screening integrations. Cross-functional technical ownership spanning property management, geospatial systems, reporting pipelines, and data science platforms.
HPC Administration
14 years of HPC administration and research collaboration in bioinformatics and biophysics, building deep intuition for systems at scale, data integrity, and long-lived infrastructure.
Agile Process & Distributed Team Leadership
Application of Agile methodologies including Scrum and Kanban for distributed team leadership, technical roadmapping, and mentoring engineers. Certified Professional Scrum Product Owner and Scrum Master.
Experience
Professional experience10+ years
Freelancer since2016
Languages
GermanBasic knowledgeEnglishNative speaker
Project history
Architecture consulting, platform engineering, and team augmentation for startups and growth-stage companies. Pre-development evaluation of business ideas and technology bets.
Embedded as a principal on the Marketing Platform of a publicly traded global payments network operating across 170+ countries. Owned architecture and delivery for globalization, user segmentation, and CMS integrations across multi-region, regulated fintech infrastructure. Applied AI-augmented engineering workflows including LLM-assisted code generation, architectural analysis, and review to increase throughput within a short, high-stakes contract window.
Principal architect for the Data & Analytics engineering function for one of the largest residential lease-to-own platforms in the US. Designed and owned integration architecture for KYC/AML-adjacent tenant screening with regulated data providers (TransUnion, AmRent). Architected Pathlight Property Management from greenfield to production. Established engineering standards including CI/CD pipelines, disaster recovery plans, capacity models, and security review processes. Served as the primary bridge between executive, legal, and risk stakeholders and the engineering team.
Certificates
Professional Scrum Product Owner (PSPO I)
Scrum.org2016
Professional Scrum Master (PSM I)
Scrum.org2016