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Tomasz Zdunek

@tomaszzdunek

Senior Software Engineer at PEER39 who architected clinical documentation that cut note-taking time by 42%.

At PEER39, I architected a clinical documentation interface and engineered a RAG pipeline to bring relevant medical history into patient encounters. The work improved documentation accuracy by 35% and reduced clinician note-taking time by 42%.

I also developed Node.js and NestJS microservices for the platform, which handled more than 3 million daily requests at 99.95% uptime. I built AI Agents for clinical summarization and coding suggestions, cutting manual review effort by 28%.

Earlier, at Sabre Airline Solutions, I led the migration of monolithic booking systems to microservices, improving scalability by 5x and reducing downtime by 70%. My experience also includes real-time financial analytics at UBS and telecom network monitoring at Nokia Siemens Networks.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

PEER39

Nov 2021 - Present (4 years 11 months)

Architected a React.js and Next.js clinical documentation interface, reducing clinician note-taking time by 42% across 12,000+ active users. Engineered a RAG pipeline using LangChain, OpenAI API, Pinecone, and Python FastAPI to improve documentation accuracy by 35%.

Senior Frontend and Backend Engineer

UBS

May 2021 - Oct 2021 (5 months)

Built a React.js and Angular analytics dashboard with TypeScript, Redux, and TailwindCSS, delivering real-time portfolio insights to 5,000+ financial advisors. Engineered Spring Boot and Java microservices with REST APIs and GraphQL, processing 1.2M transactions per hour with 99.98% accuracy for fraud detection.

React Angular TypeScript Redux Tailwind Java Spring Boot Python fastAPI GraphQL REST APIs Kafka Redis PostgreSQL MongoDB Azure Kubernetes Docker Terraform Helm Jenkins GitLab CI CD Prometheus Grafana OpenTelemetry

Full Stack Software Engineer

Sabre Airline Solutions

May 2012 - Apr 2021 (8 years 11 months)

Led migration of monolithic booking systems to Node.js and NestJS microservices with REST APIs and GraphQL, improving scalability by 5x and reducing downtime by 70%. Developed React.js and Next.js booking interfaces with TypeScript, Redux, and TailwindCSS, serving 2M+ monthly active travel agents across 60 countries.

React Next.js TypeScript Redux Tailwind NodeJS NestJS Python Django GraphQL REST APIs Kafka Redis PostgreSQL MySQL AWS Kubernetes Docker Terraform Ansible Jenkins GitHub Actions GitLab CI CD Prometheus Grafana OpenTelemetry

Software Engineer

Nokia Siemens Networks

Jan 2009 - Apr 2012 (3 years 3 months)

Developed Java and Spring Boot backend services for network fault detection, processing 500K+ events per minute with 99.9% reliability. Built Angular and JavaScript monitoring dashboards with HTML5 and CSS3, enabling real-time visualization of 10,000+ network nodes for telecom operators.