Work experience

• Senior Fullstack Engineer

  HealthTech

  2023.11-Current

  (2 years)

  Designed and implemented scalable microservices using Python (FastAPI), Java (Spring Boot,Micronaut)to support high-performance, secure healthcare applications. Built responsive web interfaces with React, Next.js, and TailwindCSS, ensuring intuitive user experiences across devices and improving patient and provider engagement. Optimized database performance by designing efficient schemas in PostgreSQL, MySQL, and DynamoDB,leveraging ORM tools such as Hibernate and SQLAlchemy to reduce query times. Refactored backend services to improve asynchronous processing, implementing Redis-based caching and message queues (Kafka,RabbitMQ)to handle concurrent requests more efficiently. Led the migration from a monolithic system to a microservices-based architecture using Docker, Kubernetes, and Kafka, significantly improving fault tolerance and reducing system outages by 20%. Implemented robust security measures, including OAuth 2.0, JWT authentication, and role- based access control (RBAC), ensuring HIPAA compliance and safeguarding sensitive patient data. Automated CI/CD pipelines using GitHub Actions, Terraform, and Kubernetes, enabling zero- downtime deployments and improving release frequency by30%. Enhanced application reliability by achieving 90%+ test coverage through unit and integration testing (Pyytest, JUnit 5, Mockito), reducing post-deployment issues and improving overall software quality. Collaborated with DevOps teams to optimize cloud infrastructure, deploying serverless microservices on AWS (Lambda, API Gateway, RDS, DynamoDB) to enhance scalability and reduce operational costs. Facilitated Agile development practices using Jira, leading sprint planning sessions and conducting code reviews to improve team productivity and maintain high code quality.
• Senior Fullstack Engineer

  Bluemvmt

  2022.04-2023.09

  (a year)

  Designed and developed backend service using Spring Boot to manage ESG cases and sustainability documentation. Architected backend services and data pipelines using Java and Kafka, enhancing auditing and data retrieval performance. Built dynamic frontend interfaces using Vite, TypeScript, and TailwindCSS, implemented complex state management with Angular services and NgRx. Visualized complex, high-volume datasets using AG-Grid and Angular Material, Ant Design to deliver clean,efficient user interfaces. Developed and exposed both internal and external RESTful and GraphQL APIs, integrating AI- driven document tagging and classification modules. Led full-stack automated testing and CI/CD initiatives using GitHub Copilot, Spring Boot Test, and Pytest, integrating quality checks into GitHub Actions workflows and enforcing rigorous peer review standards. Integrated Single Sign-On (SSO) with Okta across platforms such as Jira, Slack, internal admin dashboards,and AI simulation tools. Optimized slow API endpoints by improving SQLAlchemy queries, enhancing Hibernate and JPA configurations, and middleware logic, while identifying and resolving critical performance and reliability bugs. Fostered a collaborative engineering culture focused on shared ownership, open communication, and frequent technical design reviews.
• Mid Fullstack Engineer

  Industry 4.0 Solutions

  2017.01-2021.10

  (5 years)

  Designed, developed, and optimized high-performance applications for retail, iGaming and real estate domains,successfully supporting millions of daily active users with a seamless experience. Architected and optimized backend service using Python(Django), achieving a 50% reduction in API response times and a35%increase in data throughput. Designed performant database architectures for MySQL and PostgreSQL, optimizing queries, indexes, and implementing sharding strategies to handle growing data workloads. Architected event-driven systems with Kafka, RabbitMQ, and WebSockets, ensuring reliable async communication and supporting real-time features in high-traffic applications. Integrated third-party services like payments, authentication, and analytics to enhance user experience and business intelligence. Optimized frontend performance through techniques like lazy loading, code splitting, and bundle analysis, resulting in significant reductions in load times and enhanced user experience across retail,iGaming,and real estate platforms. Designed and implemented using React and Storybook, enhancing UI/UX responsiveness, modularization, and maintainability while streamlining component development, testing, and documentation. Participated in code reviews and knowledge-sharing sessions, contributing to a quality-first engineering culture and promoting best practices in a fast-paced,agile environment.
• Junior Fullstack Engineer

  Instinctools

  2014.02-2016.11

  (3 years)

  Contributed to full-stack projects in a consulting firm serving diverse industries, including startups and enterprise clients. Built interactive web interfaces using AngularJS, and vanilla JavaScript, improving usability scores by25%for enterprise dashboards based on client feedback. Developed backend logic in Java,implementing business features and third-party integrations. Implemented real-time communication features, including WebSockets for chat, push notifications, and live updates, improving user engagement and retention. Designed relational schemas and crafted complex SQL queries in PostgreSQL, enabling robust data-driven features in client apps. Worked closely with senior engineers, designers, and clients, developing strong communication and collaboration skills essential for consulting projects.

Educational experience

• Warsaw University of Technology

  Computer Science

  2009.09-2013.07

  (4 years)

  I graduated from Warsaw University of Technology in computer science.

Languages