Sergiusz Michalski

Principal Java Software Engineer & Backend Architect I am a senior technical leader with 22 years of commercial Java experience, specializing in the banking, telecommunications, and mobile industries. My expertise lies in designing and developing highly scalable, distributed backend systems and processing high-volume data in real-time.

As an independent consultant and Quant Developer, I have successfully engineered bespoke High-Frequency Trading (HFT) bots and algorithmic trading solutions operating on NASDAQ and NYSE. My recent enterprise work includes developing AI-aided credit lending software utilizing Gemini 3.1 Pro and OpenAI for global banking operations at HSBC, as well as architecting distributed computation platforms for the Nordic banking sector.

I possess a deep, hands-on technical stack encompassing modern Java (J2SE 1.4-25, Spring Boot), microservices architecture, and cloud deployments across AWS, Azure, and GCP using Docker and Kubernetes. Additionally, I bring strong domain knowledge in Blockchain technology, including Ethereum protocol implementations, smart contracts (Solidity), and zero-knowledge proofs. I am looking for challenging architectural and backend development undertakings where extreme performance and system reliability are critical.