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Iwona K
From Poland 03:07 PM (GMT+02:00)
$40/hr or $70,000/yr
Active 49 minutes ago

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Senior Frontend Developer

Front-end Engineer
Available for hire
Years of experience
20+ years
Experience level
Senior
Available for
Contract
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Senior Frontend Developer with 8+ years building React & TypeScript applications, backed by a 20-year foundation in software engineering. Experienced in leading large-scale refactoring efforts, building design systems from scratch, and introducing testing cultures. Currently focused on B2B SaaS development with React, TypeScript, and Next.js.

Key achievements:

  • Led modernization of a ~5,000-file JavaScript codebase to TypeScript at Sherpany
  • Designed and developed a company-wide Design System using Storybook and Figma, adopted by 5+ teams
  • Introduced TanStack React Query, React Hook Form, and React Testing Library — replacing legacy patterns
  • Built and maintained Playwright E2E test suites, increasing release confidence

Tech stack: React, TypeScript, Next.js (App Router), Redux Toolkit, TanStack React Query, React Hook Form, Storybook, Playwright, Jest, Cypress, REST APIs, GraphQL, Docker, CI/CD (GitHub Actions)

Looking for remote frontend roles in B2B SaaS where I can drive technical quality, mentor teams, and own features end-to-end.

Skills

JavaScript CSS TypeScript Scrum React.js Next.js Node.js GraphQL Cypress.js Playwright Docker Angular.js Redux.js SASS REST Jest Webpack React Query Storybook Ant Design RabbitMQ Git GitHub Figma Agile CI/CD Web accessibility HTML .NET C#

Languages

English French Spanish Polish

Employment History

Senior Frontend Engineer at Sherpany 2020 - 2026
B2B SaaS platform for corporate boards and executive teams. Led large-scale refactoring and modernization of a ~5,000-file JavaScript codebase to TypeScript, improving maintainability and developer productivity. Designed and developed a company-wide Design System using Storybook and Figma-based guidelines, creating reusable, accessible UI components adopted by 5+ teams. Modernized the frontend stack by introducing TanStack React Query, React Hook Form, and React Testing Library. Built and maintained Playwright E2E test suites, increasing confidence in releases and reducing regressions. Owned features end-to-end — from concept through design collaboration to production deployment. Mentored frontend developers through code reviews, architecture discussions, and pair programming. Technologies: React, TypeScript, Next.js (App Router), Redux Toolkit, TanStack React Query, React Hook Form, Ant Design, Figma, Storybook, Playwright, Jest, GitHub Actions, REST APIs, Docker.
Senior Frontend Engineer at AgriCircle AG 2018 - 2020
Swiss agri-tech company building tools for sustainable and regenerative farming. Built and maintained React and TypeScript web applications in a small startup team (11–20 people), taking ownership of frontend architecture and delivery. Developed and managed a modular Angular component library, enabling consistent UI across multiple internal apps. Set up and maintained CI/CD pipelines (Azure DevOps) to streamline builds, testing, and deployments. Technologies: React, TypeScript, Angular, RxJS, NgRx, Angular Material, Azure DevOps, REST APIs.
Senior Software Developer at Aspen Grove Solutions 2017 - 2018
Built web applications using ASP.NET MVC, Web API, and React. Applied TDD and messaging with NServiceBus. Technologies: ASP.NET MVC, Web API, React, NServiceBus.
Senior Software Developer at Capgemini 2016 - 2017
Developed enterprise web and desktop applications using C#, ASP.NET MVC, Angular 2+, and WPF. Worked in a large distributed international team on complex enterprise solutions. Technologies: C#, ASP.NET MVC, Angular 2+, TypeScript, WPF, RxJS, SASS.
Senior Software Developer at Intive 2015 - 2016
Built web applications using ASP.NET, AngularJS, and Web API. Worked in Scrum teams delivering features iteratively. Technologies: ASP.NET, AngularJS, Web API, JavaScript, Scrum.
Senior Software Developer at Ericpol (now part of Ericsson) 2014 - 2015
Developed web, desktop, and mobile applications using C# and .NET technologies. Worked in the telecommunications sector on software for network management. Technologies: C#, .NET, WPF, ASP.NET, JavaScript.
Software Developer at Antenna Software (now part of Pegasystems) 2011 - 2014
Built and maintained web and mobile enterprise applications using C#, .NET, and JavaScript. Worked across frontend and backend on mobile middleware solutions. Technologies: C#, .NET, ASP.NET, JavaScript, HTML, CSS, jQuery.
Software Developer at Making Waves 2009 - 2011
Built interactive web applications and contributed to large-scale digital projects for international clients. Technologies: JavaScript, HTML, CSS, jQuery, ActionScript.
Software Developer at MRM Worldwide 2007 - 2008
Developed interactive web experiences and marketing microsites for global clients at a digital marketing agency. Technologies: ActionScript, Flash, JavaScript, HTML, CSS.
Web Developer at Onet.pl 2005 - 2007
Built and maintained web applications and interactive features for one of Poland's largest web portals serving millions of users. Technologies: PHP, JavaScript, HTML, CSS, ActionScript, Flash.

Education

Master of Science, Computer Science at Cracow University of Technology (Politechnika Krakowska) 2001 - 2006
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