Fullstack Developer

Employment

• Senior Engineer

  Balyasny Asset Management L.P. - 1 year 9 months

  Balyasny Asset Management is a global multi-strategy investment firm that uses data-driven solutions and advanced technology to support trading and investment decisions.

  • Leading the development of internal financial tools and analytics systems, focusing on performance and scalability.
  • Collaborating with cross-functional teams to integrate third-party APIs and ensure data reliability.
  • Enhancing frontend performance and developer tools with a modern React and TypeScript stack.
  • Supporting architectural evolution and mentoring mid-level engineers on best practices.

  Technologies:

  • Technologies:
  • PostgreSQL
  • Ruby
  • TypeScript
  • GraphQL
  • Rust
  • Cypress
  • Tauri

• Full Stack Developer (Front End Lead)

  Frey Warsaw - 9 months

  Frey is a digital car leasing and vehicle management company offering web and mobile solutions for B2C/B2B users.

  • Modernized the frontend infrastructure and improved the performance of critical features, including document upload and form rendering.
  • Developed and integrated a document management system with AWS services.
  • Built backend microservices in Node.js for PDF manipulation and Excel file parsing.
  • Acted as frontend lead, mentoring team members and coordinating work across frontend and backend teams.

  Technologies:

  • Technologies:
  • React.js
  • PostgreSQL
  • HTML
  • CSS
  • Node.js
  • Microservices
  • Team Leading

• Fullstack Developer

  Walnut Remote - 1 year 7 months

  Walnut is a platform for B2B sales representatives to create interactive product demos and measure engagement.

  • Developed UIs in React for an application tailored to business sales representatives, enabling them to create interactive product demos and track their impact on sales opportunities.
  • Maintained and expanded GraphQL APIs in Elixir, integrating with third-party services, and authored unit and end-to-end (E2E) tests for the application.
  • Took on leadership responsibilities, leading retrospective meetings, initiating cross-team projects, drafting RFCs, and developing leadership skills.

  Technologies:

  • Technologies:
  • React.js
  • HTML
  • GraphQL
  • Cypress
  • Elixir
  • Jest

• Typescript Developer

  Goldman Sachs Warsaw - 2 years

  Goldman Sachs is a global investment bank providing financial services in trading, asset management, and securities.

  • Contributed to the development of a trader-focused application for Commodities and FX orders, optimizing React components for real-time processing of large datasets.
  • Managed the development of algorithmic FX order functionality on the frontend.
  • Applied event-driven design principles using WebSockets, RxJS, and MobX to build robust, real-time user interfaces.
  • Performed unit and end-to-end (E2E) testing for the application.
  • Gained domain knowledge in the banking industry, with a focus on currency exchange.

  Technologies:

  • Technologies:
  • React.js
  • HTML
  • TypeScript
  • RxJs
  • MobX
  • Cypress
  • Jest

• JavaScript Developer

  Credit Suisse Warsaw - 6 months

  Worked via ITDS Business Consultants for internal HR and business automation tools on the ServiceNow platform.

  • Worked as a JavaScript developer on the ServiceNow platform.
  • Contributed to the development of internal HR and business process automation tools.
  • Used Angular.js to create UIs and integrate them with ServiceNow’s backend, forms, and other components.

  Technologies:

  • Technologies:
  • JavaScript
  • Angular.js
  • ServiceNow Customer Service Management
  • ServiceNow ITSM