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Gracjan Baranowski

@gracjanbaranowski

Senior Software Engineer at Tata Consultancy Services who cut failed patient-record handoffs by 28% with TypeScript and REST APIs.

Poland

Message

At Tata Consultancy Services, I built Node.js services for a healthcare client, connecting scheduling, provider updates, and device status events across web and hardware-facing workflows. I integrated external vendor systems with TypeScript and REST APIs, reducing manual re-entry and failed handoff cases by 28%.

I implemented event routing with Azure Service Bus and Azure Functions for location-triggered alerts and notification retries. I also improved deployment pipelines with Azure DevOps and Docker, shortening release validation from days to under four hours.

At eBay, I developed backend flows for order, payment, and seller notifications, and built transaction-facing endpoints with Node.js and MongoDB. Earlier, I worked on seller APIs and reporting performance at eBay, and on payment and repayment services at Klarna.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

Tata Consultancy Services

Mar 2024 - Present (2 years 7 months)

Built Node.js backend services for a healthcare client, connecting scheduling, provider updates, and device status events. Designed API integrations with external vendor systems using TypeScript and REST APIs, reducing manual re-entry and cutting failed handoff cases by 28%.

NodeJS TypeScript REST APIs Azure Service Bus Azure Functions Azure DevOps Docker ExpressJS Grafana Prometheus

Senior Software Engineer

eBay

Jan 2022 - Feb 2024 (2 years 1 month)

Developed backend flows for order, payment, and seller notification journeys on a high-traffic marketplace. Used Node.js and MongoDB to build transaction-facing endpoints, improving lookup performance for support tools by 35%.

NodeJS MongoDB Kafka Redis Swagger OpenAPI Jest Kubernetes AWS EC2 S3 Lambda

Software Engineer

eBay

Jan 2020 - Dec 2021 (1 year 11 months)

Built seller-facing APIs in JavaScript and Express.js for inventory sync and shipping status updates. Optimized PostgreSQL queries and index usage for reporting endpoints, lowering response times from around 900 ms to 260 ms.

JavaScript ExpressJS PostgreSQL Mocha Sinon

Software Engineer

Klarna

Jul 2018 - Dec 2019 (1 year 5 months)

Implemented Node.js services for payment and repayment workflows, supporting customer checkout, financing decisions, and downstream ledger updates. Built integration layers with external merchant APIs and internal event streams using RabbitMQ.

NodeJS RabbitMQ Redis Jenkins GitHub Actions Terraform