austrian building regulation compliance saas, built and maintained outside working hours.

sole technical owner from zero to production: architecture (fastapi, next.js, postgresql), development, deployment, and ongoing maintenance.

achieved 100% retention among demo users by iterating on validated user pain points rather than speculative features. integrated odoo for automated payment reconciliation, enabling seamless invoice workflows between platform users and freelancers.

data analytics team building etl infrastructure for a multi-tenant, multi-product customs compliance platform.

led the replacement of apache nifi with a custom etl extraction service on argo workflows, handling hundreds of jobs per day including online refreshes of multi-gigabyte tables with millions of records. nifi’s visual model and poor fit for programmatic control made it the wrong tool at this scale.

architected a patchable, multi-layer configuration system (pydantic + kubernetes + helm) giving per-tenant, per-environment control over etl behavior — solving a key operational pain point in the multi-tenant setup.

built datahub, an internal data catalogue (fastapi + patternfly ui) serving as the single entry point for users to discover and access data across the platform. established monitoring and alerting that made previously invisible failures visible.

stepped into a de facto technical lead role: driving architectural decisions, collaborating directly with the product owner, and authoring adrs that shaped the platform’s direction.

built high-performance microservices for assets, pricing, and hedging on a platform serving millions of concurrent users — direct exposure to financial-grade latency and reliability requirements.

developed services for a new security-token asset type, expanding the platform’s tradable offerings. technically onboarded new exchanges to improve broker resilience.

monitored kafka metrics via datadog, improving system reliability and incident response across the trading infrastructure.

built and maintained a photovoltaic plant monitoring system enabling real-time analytics for thousands of devices. integrated ml models into an ai-driven fault analysis pipeline.

led architectural decisions for scalable system design. mentored junior developers on engineering best practices.

energy market software. maintained an in-house graph database, built a custom datetime library that drastically reduced build times, and led the python 2.7 → 3 migration.

power-hardware-in-the-loop systems. built software for advanced power electronics testing and a test framework for hardware-level validation.

enterprise software and microservices for diverse client projects. led requirements engineering for a key client.

planned and executed migration from centralized vcs to git, including a tool to migrate all code and metadata while preserving history.

https://marvinkanas.com/ https://michalandrysiak.com/ https://paulinabuda.com/

Thesis: Differential Rendering for Computed Tomography Reconstruction